Microservices: a more flexible architecture for modern public-sector systems
Microservices are a software architecture principle in which a system is built not as one large solution, but as a set of separate services that communicate with each other. Each service performs a clearly defined function, for example user authentication, document generation, message sending or data search. These services usually communicate via API, so they can be developed, deployed and maintained independently of one another.
This model is often compared with a monolithic architecture, where the whole system operates as one large software unit. A monolith can be suitable for smaller projects, but as functionality, the number of users and the need for integrations grow, maintenance becomes more complicated. Microservices architecture makes it easier to adapt to change, especially when an organisation needs to modernise digital services in stages.
Why are microservices relevant for the public sector in the EU?
Public-sector organisations in the EU – municipalities, schools, museums, libraries, cultural centres or administrative organisations – often work with different information systems that need to exchange data and operate reliably. In practice, this means that one organisation may use a website, a document management system, a registration form, a newsletter tool, resident service solutions and various internal platforms. Microservices help break such functions into clear parts and avoid a situation where one change affects the whole system.
For example, on a municipality website, the registration of resident requests, authentication for e-services, document downloads and message sending can be implemented as separate services. If only one function needs to be updated, for example the e-mail sending mechanism or an integration with an external system, there is no need to rebuild the whole platform. This is especially important for organisations that want to modernise systems gradually without interrupting day-to-day work.
Main advantages of microservices
- Flexibility and growth. Each service can be improved separately, so the system can adapt more easily to new legal, organisational or technological requirements. This is useful when public-sector organisations need to respond quickly to changed processes, new services for residents or additional integrations.
- More reliable operation. If one service fails, it does not necessarily mean that the whole system stops working. For example, if the message sending module is temporarily unavailable, resident registration or information search functions may remain accessible.
- Easier maintenance. Smaller services with a clear purpose are usually easier to test, update and document. This is important in long-term public-sector projects, where systems need to be understood not only by developers, but also by IT maintenance teams and procurement or administration specialists.
- More convenient integrations. Microservices make it easier to connect to other systems via API. This is relevant when you need to integrate registration forms, document management, payment solutions, library catalogues or museum exhibition databases.
Where can microservices be applied in practice?
In public-sector digital solutions, microservices can be used in very different ways. Schools or education centres can separate news publishing, event calendars, club registration and user management. In this case, each function can be developed according to real needs without burdening the whole website or portal.
For museums and libraries, microservices architecture is useful when different content sources need to be connected: an event calendar, digital collection search, educational session registration, ticket information or newsletter subscription. If one function changes more often than the others, it can be updated independently. This helps plan the budget more efficiently and reduces the risk of technical changes.
In municipalities, microservices are especially useful where several different e-services are provided to residents. Instead of one difficult-to-manage system, there can be separate services for submitting requests, identity verification, document generation, message sending and data exchange with internal systems. Such a model makes responsibilities clearer and makes it easier to expand functionality in the future.
Accessibility, security and GDPR
When building systems based on microservices, it is important not to forget that technical flexibility must go together with accessibility, security and compliance with legal requirements. Public-sector websites and systems must be convenient for all users, including people with disabilities. This means that each service – from the registration form to document downloads – must be designed in line with accessibility principles: clear structure, keyboard operation, understandable messages and compatibility with assistive technologies.
The GDPR context is equally important. If different microservices process personal data, it is necessary to clearly define what data is collected, where it is stored, who has access and how its security is ensured. In practice, this means access control, action logging, the data minimisation principle and carefully designed integrations between services. The more separate components there are in a system, the more important consistent security management becomes.
What should be assessed before choosing microservices?
Although microservices offer many advantages, they are not an automatic solution for every project. Such an architecture requires a clear technical strategy, good system documentation, monitoring and responsible management of integrations. If an organisation has a very simple website or limited functionality, a monolithic solution can sometimes be more practical.
However, when a system grows, includes different services, connects to external platforms and has to be continuously improved, microservices become a solid foundation for long-term growth. For public-sector organisations, this means not only technical convenience, but also greater resilience to change, clearer system management and the ability to create more reliable digital services for residents.