"Don't build a skyscraper as if it were a single piece of concrete". In modern software, modularity is the only guarantee of survival.
When a company grows, its software often becomes a "monolith": a giant system where everything is intertwined. The problem is that when something fails or you need to change one part, the whole system is at risk. Microservices architecture breaks this model by splitting the application into independent services that communicate with each other. In backend and API projects and in legacy application modernisation we apply this architecture to ensure scalability. It is the difference between a house of cards and a LEGO build.
However, not every project needs microservices from day one. What is critical is to identify the point at which the monolith becomes unmanageable: endless deployment cycles, difficulty onboarding new developers or frequent outages when making small changes. From there, a gradual strategy of modularisation and domain separation starts to make sense.
Monolithic Architecture
Hard to scale, slow deployments, total failure risk.
Microservices (ASD)
Independent scaling, continuous deployments, high resilience.
1. Why do leading companies choose microservices?
Migrating to this architecture offers competitive advantages that directly impact the business:
Granular Scalability
If your payment gateway gets heavy traffic on Black Friday, you only scale the payments service, not the entire site. This saves huge costs on servers (AWS/Azure).
Fault Isolation
If the product recommendations service fails, the customer can still buy. The system stays up even when one part has an error.
Technology Independence
Each microservice can use the technology that suits it best. Python for AI, Node.js for the API and Go for heavy processes. No strings attached.
2. Is it time to migrate?
It is not always necessary. At ASD Solutions we only recommend microservices when:
- Your current monolith is so large that any small change takes days to deploy.
- You have different teams working on the same code and they constantly "step on each other".
- You need 99.9% availability and cannot afford total outages.
Do you really need microservices?
Microservices solve specific problems of scale and of large teams working in parallel, but they are not free: they add operational complexity, distributed deployment and observability that someone has to manage. For many SMEs, a well-structured, modular monolith is faster to build, cheaper to run and more than enough for years. The right question is not "microservices, yes or no?", but "which part of my system needs to scale or deploy independently?".
Breaking a system into microservices without a real need is one of the mistakes that costs the most in maintenance. If you are unsure which architecture fits your case, a 190 € technical audit analyses your current system and recommends whether microservices, a modular monolith or a hybrid approach suits you, with fixed cost and timeline before starting.
Common mistakes when adopting microservices
The three most common stumbles: starting with infrastructure before domain boundaries, ending up with microservices that call each other for everything, the worst of both worlds; sharing a single database across services, breaking the independence that justified splitting them; and not investing in monitoring from day one, so that when something fails you do not know which service it was. We build microservices only when they add value, with clear domain boundaries, their own persistence per service and observability included from the start.
Frequently Asked Questions about Microservices
When should I migrate from monolith to microservices?
When your monolithic application becomes hard to maintain, deployments take more than 30 minutes, or you need to scale different parts of the system independently.
What are the real benefits of microservices?
Independent scalability, fault isolation, specific technologies per service, and autonomous teams working without interference.
Is it more expensive to develop with microservices?
Initially yes, but in the long run it reduces infrastructure and maintenance costs by allowing granular scaling and lower risk of critical failures.
Can we start with a hybrid approach?
Yes. In many cases we start by extracting only one or two critical modules (e.g. billing or authentication) into independent services, keeping the rest of the system as a monolith while the new architecture is validated.
Conclusion: Architecture for the future
In short, microservices are not just a technology trend but a strategic decision for companies aiming for global scale. At ASD Solutions we help turn rigid systems into agile, modular infrastructures. Migrating to microservices requires experience and a clear view of each business domain's boundaries. If your current software has become an obstacle to innovation, it is time to build an architecture that works for you, not the other way around.
If your roadmap includes moving infrastructure to the cloud, also check our guide on on-premise to cloud migration (AWS and Azure) , where we detail the architecture models and real costs of the process.
