Microservices: Definition, Benefits, Drawbacks, and How to Get Started

Microservices have become a prominent software trend that promises greater efficiency and scalability, but understanding what they truly entail and when to invest in them is essential for IT decision‑makers.

What Are Microservices?

According to Gartner, a microservice is a component of an application that is tightly scoped, strongly encapsulated, loosely coupled, independently deployable, and independently scalable. Key characteristics include strict scope, strong encapsulation, loose coupling, independent deployment, and independent scalability.

Strict scope – a narrowly defined purpose.

Strong encapsulation – the full implementation of its functionality.

Loose coupling – operates independently of other services.

Independent deployment – can be deployed without affecting others.

Independent scalability – only the affected service needs to be scaled.

A typical example is an e‑commerce platform where each business domain (order processing, product catalog, search, billing, payment, delivery, PCI DSS compliance, etc.) is a separate microservice.

How Microservices Work

In a monolithic application, the frontend and backend are separate codebases. In a microservice architecture, the frontend remains unchanged while the backend is split into multiple services, each with its own repository and possibly its own language.

Each microservice can be built with different technologies, and tools like Docker and Kubernetes simplify creation, deployment, and management.

For smaller projects, a monorepo can be used to keep all microservices in a single repository while sharing a common tech stack.

Benefits of Microservices

Codebases align with business domains, making them easier for developers and business stakeholders to understand.

Ideal for distributed teams; different teams can work on separate services without interference.

Improved maintainability; smaller, independent code fragments are easier to comprehend.

Frequent, isolated deployments reduce risk to the whole application.

Higher productivity; developers can work independently on smaller services.

Technology freedom – each service can use the most suitable stack, reducing vendor lock‑in.

Performance, efficiency, and scalability – services can be scaled individually.

Reliability – fault isolation prevents a single service failure from cascading.

When Microservices May Not Be Ideal

Large companies like Netflix benefit from modularity, but the cost of implementing microservices (logging, monitoring, tracing, deployment pipelines) can outweigh benefits for smaller, less complex systems.

Excessive agility can lead to operational overhead; managing many services requires mature DevOps capabilities.

For new greenfield projects with uncertain requirements, starting with a monolith may be simpler, with the option to migrate later.

How to Start with Microservices

Key considerations before adopting microservices:

Validate that the project justifies a microservice approach.

Ensure a strong agile culture is in place.

Invest in DevOps skills and tooling.

Transition strategies include:

Do not start from scratch if an existing monolith exists; extend it with new microservices while keeping the core.

Avoid a “distributed monolith” where modules are tightly interdependent.

Modularize the monolith gradually, extracting independent pieces as services.

Conclusion

Microservices offer significant potential, but they should be adopted only when project complexity justifies the added maintenance and migration costs. The decision to move from a monolith to microservices must consider many factors, including team structure, scalability needs, and operational maturity.