Monolith – Definition, Use Cases and Best Practices at a Glance
Software architecture where all functionality is in a single, cohesive codebase and one shared deployment artefact.
What is a Monolith? Architecture, Pros & Cons
The monolith is the oldest and still most widespread architecture pattern in software development. Despite the microservices hype, a monolithic architecture is the right choice for many companies, especially in the early phase of a project. Knowing its strengths and limits and recognising the right time for migration is what matters.
This glossary entry for Monolith gives you a clear Definition, practical Use Cases and Best Practices at a glance – with examples, pros and cons, and FAQs.
What is Monolith?
- Monolith – Software architecture where all functionality is in a single, cohesive codebase and one shared deployment artefact.
A monolith is a software architecture where all functionality of an application is combined in one codebase. Frontend, backend, business logic and database access are developed, compiled and deployed as one unit. Typical examples are classic Java EE applications, WordPress installations or Ruby on Rails apps.
A well-structured monolith uses modules or layers (layered architecture) for internal order but is still deployed as a single artefact. The so-called modular monolith aims to combine the simplicity of a monolith with the structure of microservices.
How does Monolith work?
All components of a monolith run in the same process and share the same memory. Function calls between modules happen directly in memory, which is very fast and reliable. A single database stores all data, making consistent transactions trivial (ACID). For deployment, the whole application is rolled out as one unit.
Changes to one module therefore require a full build and redeployment of the entire system.
Practical Examples
WordPress: One of the most successful monolithic applications, powering over 40% of all websites worldwide. PHP code, templates and database in one unit.
Mid-size e-commerce shop: Shop frontend, product management, inventory and customer management in one Django or Laravel application.
Internal company portal: Employee directory, leave requests, time tracking and document management as a monolithic Java Spring application.
Startup MVP: A first version of a SaaS product built as a monolith to get to market quickly and gather feedback.
Typical Use Cases
Startups and MVPs: Fast development and simple deployment when speed matters more than scalability
Small teams (2–8 developers): Less infrastructure overhead and simpler coordination than with microservices
Simple domains: Applications with manageable complexity that do not require independent scaling of parts
Prototypes: Quick validation of business ideas without the overhead of distributed systems
Internal tools: In-house applications with predictable load and limited user base
Advantages and Disadvantages
Advantages
- Simplicity: One codebase, one deployment, one log, one debugging process
- Performance: Direct in-memory calls instead of network communication between services
- Consistency: ACID transactions across all data without distributed transaction patterns
- Lower operational effort: No Kubernetes, no service mesh, no distributed tracing infrastructure
- Quick start: Fewer architecture decisions and tooling setup for new projects
Disadvantages
- Scaling limits: The whole application must be scaled even when only one part is under load
- Deployment risk: Every change requires a full redeploy with potential outage
- Growing complexity: Build times and risk of spaghetti code increase with codebase size
- Team bottlenecks: Large teams block each other when changing the same codebase
Frequently Asked Questions about Monolith
Is a monolith bad?
No. A monolith is the right architecture for many applications, especially for startups, small teams and applications with manageable complexity. Even large companies like Shopify use a modular monolith successfully. Clean internal structure with clear module boundaries is what matters.
When should you move from monolith to microservices?
When teams block each other on deployment, when individual parts need to scale much more, or when the codebase is so large that changes are risky and build times long. The move should be incremental using the Strangler Fig pattern.
What is a modular monolith?
A modular monolith is a monolith with clearly separated internal modules, each with its own domain boundaries. Modules communicate via defined interfaces instead of direct database access. This gives the simplicity of a monolith with structure that makes later migration to microservices easier.
Direct next steps
If you want to apply or evaluate Monolith in a real project, start with these transactional pages:
Monolith in the Context of Modern IT Projects
This page provides a concise definition of Monolith, practical use cases and best practices at a glance — everything you need to evaluate the technology for your next project. Monolith falls within the domain of Architecture and plays a significant role across a wide range of IT projects. When evaluating whether Monolith is the right fit, organizations should look beyond the technical merits and consider factors such as existing team expertise, current infrastructure, long-term maintainability, and total cost of ownership.
Drawing on our experience from over 250 software projects, we have found that correctly positioning a technology or methodology within the broader project context often matters more than its isolated strengths.
At Groenewold IT Solutions, we have worked with Monolith across multiple client engagements and understand both its advantages and the typical challenges that arise during adoption. If you are unsure whether Monolith suits your particular requirements, we are happy to provide an honest, no-obligation assessment. We analyze your specific situation and recommend the approach that delivers the most value — even if that means suggesting an alternative solution.
For more terms in the area of Architecture and related topics, see our IT Glossary. For concrete applications, costs, and processes we recommend our service pages and topic pages — there you will find many of the concepts explained here put into practice.
Related Terms
Want to use Monolith in your project?
We are happy to advise you on Monolith and find the optimal solution for your requirements. Benefit from our experience across over 200 projects.