Understanding Microservices Architecture

I really don’t remember when I first came across this term, but being a nerd who loves to explore, I stumbled upon a few articles and videos — and now I finally understand what Microservices Architecture is and why we even need it in the first place. So, let’s begin.

Stepping Back: What Is Monolithic Architecture?

Before diving into microservices, let’s take a step back and understand what Monolithic Architecture actually means.

Monolithic architecture is a software design model where all components — such as the user interface, business logic, and data access layer — are combined into a single, unified codebase that runs as one unit.

To be honest, this architecture works perfectly fine for small to medium-sized projects, side projects, and even MVPs (Minimum Viable Products) or small internal tools.
But this approach starts to fall apart as the project scales, especially at the level of companies like Spotify or Netflix.

To get a clearer picture, let’s look at the advantages and disadvantages of the monolithic approach.

Advantages

• Easier to Develop — Everything is in one place, so setting up and starting development is quick and straightforward.
• Easier to Maintain — A single codebase means fewer moving parts to keep track of.
• Single Codebase & Easier to Understand — Developers can see the whole system in one view, making debugging simpler.
• Tightly Coupled — All parts work together smoothly, reducing communication overhead.
• Easier to Deploy — You just deploy one big application — no need to manage multiple services.

 

Disadvantages

• No Independent Development — Teams can’t work on separate parts without stepping on each other’s code.
• No Independent Deployment — You have to redeploy the entire app even for a small change.
• Limited Scaling — You can’t scale specific parts; you have to scale the whole thing, which wastes resources.
• Limited Technology Flexibility — You’re stuck with one tech stack across all modules.

Now you can see the problems with monolithic architecture.
To fix these issues, Microservices Architecture was introduced — and companies like Netflix and Spotify were among the first to adopt it successfully.

What Are Microservices?

By definition, Microservices are an architectural approach to building applications as a collection of small, independent services that communicate with each other over a network.

Basically, microservices were created to overcome the limitations of monolithic systems.
But, as we all know, with every advantage comes a set of new challenges.

Disadvantages of Microservices

• Complex to Code — Managing multiple independent services can get messy.
• Complex to Maintain — Keeping track of different versions and deployments is challenging.
• Hard to Understand the Overall Codebase — Since each service is independent, it’s tough to see the whole picture.
• Management Overhead — Requires proper coordination between multiple teams and services.
• High Infrastructure Costs — Running and maintaining several services increases cloud and operational costs.

How Much Should We Break Into Microservices?

Honestly, there’s no fixed rule for how much you should break your application into microservices.
It depends on your business logic, requirements, and how you want to structure your system.

Most companies keep this information private — so only internal teams really know how their microservices are divided.

How Do Microservices Interact With Each Other?

You might think, “Okay, we’re dividing the features into smaller projects — but how do they talk to each other?”

There are a few common methods:

1. Synchronous Communication — The classic way, where one service calls another via APIs (like REST or gRPC).
2. Asynchronous Communication — Services communicate using message brokers such as Apache Kafka, without waiting for an immediate response.
3. Service Mesh — A modern approach (like Kubernetes with Istio) that manages how services communicate, adding security, monitoring, and reliability.

Final Thoughts

Microservices are not a silver bullet — they solve scaling and flexibility issues, but introduce their own complexity.
For small teams or early-stage projects, a monolith might still be the right choice.
But as your system grows in size and complexity, microservices give you the power to scale, innovate, and deploy faster — if managed well.

“In the end, it’s not about choosing monolith or microservices — it’s about choosing what fits your current needs and future goals.”

I’ll leave you with this line — sayonara, and as always: Keep learning, keep coding.