References &amp; Projects

Mobile and web development

Field service: mobile app and dispatch portal

A technical maintenance provider needed shared job status between HQ and field teams.

Challenge: Documentation scattered across messengers and paper; escalations surfaced too late.

Solution: Flutter app with offline sync, central ticket model and ERP connectivity via versioned REST APIs.

Result: Dispatch sees near-real-time status; rework from missing information decreased.

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E-commerce & online shop

B2B shop with variant logic and account pricing

A technical wholesaler wanted self-service for repeat buyers without pricing chaos.

Challenge: Frame contracts and special conditions could not be mapped with a generic B2C storefront.

Solution: Explicit pricing and approval backend, fast product API and Elasticsearch for search and filters.

Result: Repeat orders move online; exceptions stay controlled and auditable.

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API & integration development

API orchestration: commerce, ERP and carriers

A multi-brand retailer hit operational limits with point-to-point interfaces.

Challenge: Each brand introduced bespoke file flows; failures surfaced too late.

Solution: Canonical events over message queues, idempotent consumers and monitored integration health.

Result: Operations manages backlogs via dashboards; new channels plug in by configuration.

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Hosting & cloud operations

Managed hosting: SLA, observability and patch cadence

A portal operator wanted predictable releases and peak behaviour without surprises.

Challenge: Deployments felt risky; alerting under load was poorly documented.

Solution: GitOps, canary releases, golden-signal monitoring and documented on-call playbooks.

Result: Incident resolution improved; stakeholders receive availability and patch reports.

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Server load testing

Load testing before campaigns: e-commerce under peak load

A seasonal retailer needed credible limits before a major marketing push.

Challenge: Checkout and search had never been formally stressed together.

Solution: k6 scenarios from anonymised traffic patterns; joint review with infrastructure and application teams.

Result: The campaign stayed within agreed latency budgets with pre-aligned alerts.

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Legacy code analysis

Legacy code analysis for technology due diligence

Buyers needed credible technical facts before signing.

Challenge: Maintainability, security and integration risk lacked evidence without deep analysis.

Solution: Static analysis, architecture cuts and a priority matrix including a post-closing roadmap.

Result: Management mapped risks to purchase price and planned integration priorities.

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Thorsten Frieling – Project Manager Groenewold IT Solutions

From project idea to a dependable go-live

We structure milestones, quality assurance, and handover so your team keeps a clear line of sight: transparent communication, regular demos, and measurable interim outcomes—aligned with references from your sector.

Thorsten Frieling – Project management

Delphi estate: new interfaces without a big-bang rewrite

An ISV had to exchange data with SaaS CRM without funding an immediate rewrite.

Challenge: Proprietary formats and narrow delivery windows for integration work.

Solution: Adapter module with retries, audit logs and versioned REST endpoints; tests against reference datasets.

Result: The legacy line stays sellable; CRM-led projects receive reliable feeds.

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Delphi job planning: fleet API and offline sync for field work

A contracting firm wanted map data and dispatch without duplicate entry.

Challenge: Separate Delphi office planning and smartphone fleet portal.

Solution: REST adapter, offline queue with idempotency and explicit conflict rules.

Result: Dispatch and teams share reliable ETAs; phased regional rollout.

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Delphi editorial schedule: subscription status synced with shop and CRM

A publisher had to align shop campaigns and CRM master data with Delphi ship dates.

Challenge: Three systems with different cadences and permissions.

Solution: OAuth2 REST, nightly reconciliation, webhooks for urgent updates, documented conflict matrix.

Result: Fewer returns and support loops; staged releases.

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Software maintenance & operations

Delphi tenancy suite: e-signatures and accounting-ready exports

A property manager needed e-signatures and audit-friendly exports without replacing desktop ops.

Challenge: Evidence and exports without a big-bang migration.

Solution: PDF/A bundles via REST, status callbacks, versioned CSV/XML batches for the accounting partner.

Result: Staff keep familiar screens; finance and audit can trace data.

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Software rescue

Software rescue: stabilising third-party code and CI

A mid-sized service company faced red CI and scattered secrets while serving live customers.

Challenge: No reliable pipeline, minimal documentation, high day-to-day pressure.

Solution: Repository cleanup, smoke tests on core flows, security patches and branching with reviews.

Result: Delivery is predictable again; monitoring surfaces errors early.

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Software maintenance: SLA and minor releases

A public-sector organisation needed compliance and incremental improvements within a fixed cadence.

Challenge: Mandatory updates with limited business capacity for testing.

Solution: Priority matrix, maintenance windows, automated dependency PRs with review and quarterly releases.

Result: Audit receives evidence; users see steady improvements instead of stagnation.

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Björn Groenewold – Managing Director

Landing Page as a Service

Law Office Dr. Gerrit Mesch

Development of a modern, responsive law firm website for attorney Dr. Gerrit Mesch in Uplengen under our Landing Page as a Service model. The site presents services in commercial law, data protection law, and contract law with elegant design, client reviews, and straightforward contact options.

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Enterprise & web platform

Hyperspace GmbH

For Hyperspace GmbH we support development of the web application and platform using ColdFusion (CFML): architecture, implementation, and ongoing engineering within the hyperspace.gmbh environment—in close alignment with the client; engineering Made in Germany (East Frisia).

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Web platform & research

Schwarzbuch digital

Development of the “Schwarzbuch digital” web application: researched, structured presentation of tax waste in Germany, analysis and clear reading experience in the browser, implemented as a modern React single-page application (Made in Germany).

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Security

Smart Guard Control App

Development of a mobile security application for security personnel and guard services. The app enables planning and documentation of patrol rounds, event recording, and real-time reporting.

Baby Monitor

MAM Baby Monitor App

MAM wanted to offer parents a smart alternative to the classic baby monitor – no extra device, with the quality and reliability parents expect.

Challenge: The app had to be market-ready within weeks, run reliably on iOS and Android, and fit seamlessly into MAM’s existing product world.

Solution: We developed a native app in close coordination with MAM: clear UX, reliable real-time audio streaming and noise activation so parents are only notified when it matters.

Result: Around 40,000 installations in the first four weeks after release – and an app that is now a core part of the MAM baby monitor family.

“Fast, straightforward, and delivered exactly as we imagined.”

— MAM Baby

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Baby Monitor

Lullio Baby Monitor App

The Lullio Baby Monitor App transforms smartphones into a secure baby monitoring solution with HD live video and audio streaming, night vision mode, and two-way communication. With AI-powered sound detection and end-to-end encryption, the app provides maximum security for over 50,000 satisfied parents.

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From project idea to a dependable go-live

Thorsten Frieling – Project management

E-Commerce

Vibratissimo Online Shop

Development of a modern e-commerce shop for Vibratissimo with responsive design, comprehensive product management, secure payment system, and seamless brand identity integration.

Blockchain

Craftbeer Coin App and ERC20 Token

Development of a blockchain-based app for craft beer enthusiasts with integrated ERC20 token. The app allows users to manage tokens, redeem them at participating breweries, and find partner locations on an interactive map.

Fintech

Cryptocurrency Trading Platform

Development of a user-friendly cryptocurrency trading platform with real-time price data, secure transactions, and a clear dashboard for market analysis. The platform supports various cryptocurrencies and offers advanced trading tools.

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Automotive

Tankpool24 App

Development of a mobile app for Tankpool24 customers to locate gas stations, compare prices, and make cashless payments. The app offers real-time gas station availability, route planning, and a digital payment system for business customers.

Blockchain

Blockchain Ecosystem Platform

Development of a modern blockchain platform with responsive design and intuitive user interface. The platform enables building a complete blockchain ecosystem with secure transactions, smart contracts, and decentralized applications.

Automotive

TEKKEN BMW Partner Website

Development of a modern, responsive website for TEKKEN, a BMW and MINI partner in Northern Germany. The website provides information about vehicles, services, and enables appointment booking for test drives and maintenance.

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Björn Groenewold – Managing Director

Gaming

Bet Mr. Moo - Quiz App

Development of an elegant gaming and betting app with luxurious design. The app allows users to create game rounds, place bets, and interact with friends. The premium design with gold elements and dark background ensures a high-quality user experience.

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Fitness

Endurance by Endulytics

Development of a comprehensive fitness tracking app that helps users plan their workouts, track progress, and achieve training goals. The app offers personalized training plans, performance analysis, and wearable integration.

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Natural Cosmetics

Naturea Online Shop

Development of a modern online shop for natural cosmetics and sustainable care products. The shop offers an intuitive user interface, detailed product information, ingredient filtering, and a seamless shopping experience for environmentally conscious customers.

Automotive

dfreeeze Vehicle Control App

Continued development of the dfreeeze vehicle control app (iOS & Android): we took over and maintain an existing app—remote control, vehicle status, auxiliary heating; not a full greenfield rebuild. Case study with challenge, solution, and outcomes; Made in Germany (East Frisia).

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Real Estate

Real Estate Management System

Development of a comprehensive real estate management system for a leading commercial property provider. The system enables management of lease contracts, maintenance tasks, and financial data in a central platform with modern dashboard and reporting features.

Presentation

Presentation App

For our client AKHolding, we developed a presentation app (Android Tablet + iPad). The app displays a PDF document. At each startup, the app checks if a new version is available on the server and offers it for download. Communication between app and server uses FTP protocol, eliminating the need for API development. The app is distributed via Enterprise Developer Account and is not available in the App Store. Available for iOS and Android tablets.

From project idea to a dependable go-live

Thorsten Frieling – Project management

Agriculture

CRV Cattle Breeding App

Development of a specialized app for CRV for managing and analyzing cattle breeding data. The application allows farmers to filter and compare breeding bulls by various parameters such as breed, performance data, and genetic traits to make optimal breeding decisions.

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Automotive

Car Dealership App

For a car dealership, we created an app for vehicle display and customer retention. Vehicle listings are imported from mobile.de or autoscout24.de, avoiding double data maintenance. No internet connection is needed to view the vehicle inventory. At startup, the app queries the API for new or updated vehicle data. The app also features a QR code scanner for finding vehicles at the dealership and adding them to a favorites list, plus a 'My Car' section for tracking inspection, MOT, and service dates.

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Smart Home

daytime Smart Control SC16 App

Development of an intuitive smart home app for controlling lighting systems. The daytime Smart Control SC16 app allows users to program light scenarios, save them, and control their daily lighting schedule. The app offers a clear user interface with real-time control and various operating modes.

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Agriculture

CRV Repromanager App

The Repromanager app from our client CRV supports farmers in heat detection and insemination. Sensors capture animal data, which is sent to the app via web services. With just a few clicks, farmers can also order insemination services. The app was created for iOS and Android smartphones and tablets.

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IoT & Environment

InAirQ Air Quality App

Development of an innovative IoT app for monitoring indoor air quality. InAirQ connects to sensors that measure TVOC (volatile organic compounds) and other air quality parameters. The app offers an intuitive user interface with real-time readings, historical charts, and threshold alerts.

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Gaming

Tower Defense Game

Development of a strategic tower defense game with extensive customization options for defense towers. The app features a workshop system where players can equip their towers with special upgrades to develop various combat strategies. The game has an intuitive interface with detailed statistics on damage, fire rate, and range for each tower.

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Björn Groenewold – Managing Director

Agriculture & Gaming

Agri Business Simulation Game

Development of a comprehensive farming simulation app that allows players to run their own agricultural business. Agri Business offers various game areas such as field management, animal husbandry, and product processing. The app combines entertaining gameplay with realistic farming aspects and offers a multi-layered gaming experience with various challenges and growth opportunities for the virtual farm.

Mobile Game

Gold Rush 2016 Mobile Game

Development of an entertaining mobile game with a gold prospecting theme. Gold Rush 2016 is an exciting adventure game where players take on the role of a gold digger searching for valuable treasures. The game features a captivating story, lovingly designed characters, and intuitive touch controls. With various levels, challenges, and collectibles, Gold Rush 2016 provides long-lasting mobile gaming fun.

Document Management

Document Management System

Development of a customized document management system for efficient management and organization of company documents. The system offers an intuitive user interface with hierarchical structuring, version control, and comprehensive search functions. Users can categorize documents, tag them, and add metadata to improve findability.

Transport & Logistics

Mobile POS System for Parking Lots

For our client, we developed a mobile POS system based on Android. The system can verify already issued tickets. New tickets can be issued and printed with receipts via the connected BLE printer. Collected amounts are recorded in the cash book and sent to the backend at daily closing. Payment can be made by cash or EC/credit card. While a permanent server connection is intended, an offline mode was implemented for safety, ensuring continued operation during server or internet outages.

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Healthcare

OTB Cockpit - Medical Supply App

For our healthcare client, we created a cockpit app for order entry in medical supply services. The app permanently holds several hundred thousand customer and product records. The app works completely offline and can be synchronized with the server as needed. It is currently used daily by several hundred field service employees.

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E-Publishing

Interactive E-Book 'When War Stays in Mind'

Development of an interactive e-book platform for a specialist book on war traumatization. Besides the classic reading mode, the app also offers integrated audio and video elements that enrich the reading experience. Users can switch between different media formats, gaining multimedia access to sensitive topics. The platform was optimized for tablets and offers intuitive navigation between text content, audio samples, and supplementary video interviews.

From project idea to a dependable go-live

Thorsten Frieling – Project management

Event & Conference

EventConnect - Conference App

Development of a comprehensive conference app for event organizers and attendees. The EventConnect app provides clear access to all important event information: program, speakers, venue, and current news. Attendees can create their personal schedule, set session reminders, and connect directly with speakers and other participants. The app supports push notifications for schedule changes and important announcements.

Document Management

Enterprise Document Management System

Development of a customized document management system for a medium-sized company. The solution enables structured document management across various categories such as media, production, and material costs. Special focus was placed on an intuitive user interface that works optimally on both desktop computers and mobile devices like tablets. The system offers comprehensive search functions, version control, and detailed permission management. Integration into existing business processes significantly increased document management efficiency.

E-Commerce

Shop Development based on Magento

Development of a powerful online shop based on Magento with responsive design and user-friendly navigation. The shop offers clear product presentation with advanced filtering, a secure payment system, and optimized mobile view. The design gives the shop a warm, natural atmosphere that perfectly matches the brand identity while leveraging the Magento platform's capabilities.

Media Management

Media Library App

Development of an intuitive media library app for efficient management and organization of digital content. The app allows users to organize their media into different categories, tag them, and search quickly. With a clear user interface and support for various media types, the app provides a central platform for managing images, videos, and documents. Offline availability and cloud service synchronization ensure flexibility and data security.

Healthcare

Healthcare Navigator

For GHD Gesundheits GmbH, we created a portal for displaying healthcare options. The portal is connected to various systems via interfaces and can display healthcare options throughout Germany with just a few clicks.

IoT & Community

Vibratissimo App

We were commissioned by Amor Gummiwaren GmbH to complete the Vibratissimo apps. The Vibratissimo app allows a vibrator to be remotely controlled via Bluetooth or the internet. But that's not all - the app includes a complete community with features like chat, messaging system, video chat, and creation of video and image galleries.

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Björn Groenewold – Managing Director

Networking & web platform

Real Estate

Apartment Finder Saxony App

The Apartment Finder Saxony displays the current housing offers from www.wohnungsfinder-sachsen.de. Unlike other real estate apps, this app also works offline - it can be used on the train, while traveling, or whenever you have time but no internet connection. The app is available for iOS and Android smartphones.

Communication

Yooyuu App

We were commissioned by YooYuu GmbH to develop an intelligent app messenger with organizational functions for iOS and Android devices. With the YooYuu app, companies and organizations from various industries can digitally optimize communication and organization - fully GDPR compliant. The YooYuu app allows creating different groups, topic-based chats, scheduling and confirming appointments, sending information to various groups, taking notes, and reporting issues. Furthermore, the YooYuu app features an interface system enabling machine-to-human communication.

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Healthcare

PSYFLIX Psychotherapy Platform

Takeover and performance optimisation of the PSYFLIX psychotherapy platform (WordPress/PHP legacy): custom engineering for faster delivery and more stable use—with a continued focus on information, orientation, and protected areas.

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Smart Business Manager

Development of the Smart Business Manager web platform (since 2025) for managing membership and network contacts: dashboard, group management and regional search, contact database with search by industry, region, and skills, appointments and events, contact requests, substitution requests and offers, messaging between members, network overview, and profile and settings. The system connects a large nationwide contact base and many regional groups. Engineering and interfaces by Groenewold IT Solutions—development Made in Germany (East Frisia).

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Automation

Accounts payable: OCR, approvals & ERP

Automated accounts-payable processing for a mid-sized wholesaler: PDFs and scans are classified, data is extracted, approved, and posted to the ERP—with queues, approval workflows, and an audit trail. Delivered by Groenewold IT Solutions (Made in Germany).

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Automation

Sales: lead routing & CRM

Automated lead handling for a B2B software vendor: enquiries from the website, campaigns, and partner portal are enriched, routed by region and topic into the CRM, and stored without duplicates. Interfaces, rules, and monitoring by Groenewold IT Solutions (East Frisia).

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From project idea to a dependable go-live

Thorsten Frieling – Project management

Environment & Sustainability

Craft & Planning

Tradesperson Planning System

For a roller shutter manufacturer with over 100 employees, we developed a system consisting of backend and Android app. In the backend, orders can be distributed to individual tradesmen. The Android app enables measurement recording, viewing current orders, and capturing status. Materials used are also recorded via the app, so in case of a recall, the system can identify which buildings require replacement.

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Association

Protestant Working Group for Soldier Care EAS

We were commissioned by the Protestant Working Group for Soldier Care e.V. to further develop their Flutter-based hybrid app and adapt it to current iOS and Android versions.

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Motorcycle Safety

dguard Motorcycle Safety App

Takeover and continued development of the dguard motorcycle safety companion app by Groenewold IT Solutions: the app programs and controls the dguard system (emergency, GPS, departure times, comfort levels, status). Native iOS and Android, Made in Germany—not a greenfield build, but carrying forward an established app.

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Security

QuickDoor - Digital Access Control

Development of an innovative access control app for fitness studios and sports facilities. The QuickDoor app enables members keyless access to various areas of the fitness center such as main entrance, side entrance, and underground parking. The app displays all relevant information like operator ID, location, and WiFi credentials and offers an intuitive user interface for managing access points. Integration with existing security systems ensures a seamless and secure access experience.

Emissions Reporting Dashboard

Development of a comprehensive emissions tracking system for the maritime industry. The dashboard enables shipping companies to monitor and analyze their fleet emissions in real-time, create detailed reports, and identify optimization potential. With interactive visualizations, automated reporting features, and compliance tracking, the solution helps companies comply with international environmental regulations and achieve their sustainability goals.

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Smart Home

ESYLUX Smart Home App

Continuation of the ESYLUX smart home app: originally built in Xamarin, maintained by us and migrated to .NET MAUI. Control and manage lighting and automation; create projects and configure devices—a clear, responsive UI for all connected ESYLUX devices.

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Björn Groenewold – Managing Director

AI & Nutrition

Chop-E AI Cooking Assistant App

Development of an innovative AI cooking assistant named Chop-E that helps users discover new recipes and improve their cooking skills. The app offers various search modes such as search by ingredients, by dish, or random dish. With a friendly user interface and personalized recommendations, Chop-E makes cooking an interactive and educational experience.

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Warehousing

identPro Warehouse Management App

IdentPro is a leader in warehouse optimization, specializing in automated material tracking in production and warehousing. We were commissioned by IdentPro GmbH to develop an app that enables manual storage, retrieval, and relocation of products. We used the IONIC framework and optimized the app for use with ZEBRA devices, integrating the barcode scanner used in these devices.

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Data Management

SAGASU Dating App

For Digital-meets GmbH, we developed SAGASU, a dating app that differentiates itself from classic dating apps: The matching 'counterpart' is searched for via Bluetooth in the immediate vicinity, making SAGASU perfect for partner searching in clubs, discos, larger events, or anywhere people gather.

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Healthcare

FeverApp - Fever Tracking for Children

Development of the FeverApp to support parents in caring for feverish children. The app helps parents document and monitor fever symptoms, strengthens independent thinking and intuition, and serves as a valuable discussion basis with doctors. Developed in cooperation with Witten/Herdecke University and the Federal Ministry of Education and Research, the app contributes to scientific progress.

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E-Commerce

CSI Stuttgart - Portal and App for Electronic Components

The portal for buying and selling industrial electronics offers customers and dealers the opportunity to trade new and used industrial electronic components from all manufacturers via apps and website. The backend offers extensive management functions, from article management to customer management to invoice and order creation.

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Sports & Fitness

Hubit Charity Run App

HUBIT Medien-Coach e.V. organizes charity runs to collect funds for strengthening media literacy among children and youth. We developed a Flutter-based app that allows participants to register for the event and record and submit their performance.

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From project idea to a dependable go-live

Thorsten Frieling – Project management

Social Media & Blockchain

Moving Service

Transporo Moving Service Website

Development of a modern, user-friendly website for the Transporo moving service. The website offers a clear message 'Simply Move' and allows users to quickly and easily submit moving requests. With responsive design and an intuitive user interface, customers can enter their moving data and request a quote directly.

Media & Entertainment

Metropol FM Berlin Radio App

Development of a modern radio app for Metropol FM Berlin. The app allows users to listen to the radio station live, get information about current songs, and interact with the station. With an elegant user interface, playback controls, and additional features like favorites lists, the app offers an enhanced listening experience for station fans.

Navigation

TILSBERK HEAD-UP Display Navigation App

The TILSBERK Head-Up Display brings information directly into your field of view without restricting it. We developed the iOS and Android app that displays information such as speed, navigation, incoming calls, TILSBERK charge status, time, and more on your TILSBERK Head-Up Display via Bluetooth. We recently added the GPX import feature to the app.

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APPICS - Blockchain Social Media App

Development of an innovative blockchain-based social media platform that allows content creators to be rewarded for their content. The APPICS app combines social media with cryptocurrency, enabling users to earn tokens through likes, comments, and shares. With an elegant, user-friendly interface, the app offers all features of modern social networks, supplemented by a transparent blockchain-based reward system. The platform promotes authentic content and creates new monetization opportunities for influencers and content creators.

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Industry & Logistics

FROMM Keep it Smart App

Development of an Android app for managing FROMM strapping devices (P328 S and P329 S) via Bluetooth Low Energy. The app offers device overview with serial number and firmware versions, battery status monitoring, detailed strapping statistics, effortless firmware updates, and access to user manuals and spare parts lists. The privacy-optimized solution maximizes efficiency and minimizes downtime in industrial strapping processes.

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Smart Home

LEDATRONIC WiFi App

Development of the free LEDATRONIC app for smartphones and tablets to control the LEDATRONIC WiFi combustion air control system for LEDA stoves, heating inserts, and fireplace inserts. The app displays all information and functions of the combustion air control system clearly. When additional LEDA components such as the Negative Pressure Controller LUC2, the Complete Station KS04, or the Central Connection Unit ZAE are connected to the LEDATRONIC WiFi, they are automatically initialized and displayed.

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Björn Groenewold – Managing Director

Media & Entertainment

Radio Ostfriesland App

Development of a radio streaming app for Radio Ostfriesland, the regional radio station for East Frisia. The app enables live streaming of the radio program, provides current news and information about the running program. With intuitive controls, listeners can receive the station on FM 94.0 (Aurich), 87.7 (Emden) and 103.9 (Leer) on the go.

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Travel & Region

Tide & Tee App

Flutter app for iOS and Android: Tide & Tee is an in-house product by Groenewold IT Solutions—visitors on the North Sea coast get tides, weather, and tea culture for an East Frisia vacation in one app, conceived and built by us in Germany (Made in Germany), not as a client commission.

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E-Commerce

B.e.s.t. Akyol Store App

Development of a B2B ordering app for iOS and Android for B.e.s.t. Akyol Handels GmbH. The app enables business customers such as kiosk operators, beverage stores, gas stations and catering businesses to easily order beverages, confectionery and packaging materials. With barcode scanner, current offers, clear product categories and flexible payment options, the app optimizes the wholesale ordering process.

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Björn Groenewold – Managing Director

From project idea to a dependable go-live

Thorsten Frieling – Project management