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API and Microservices

Good APIs and clearly cut microservices are the backbone of modern enterprise systems.

APIs & Microservices Built for Scale

We build REST and GraphQL APIs, API-first. We draw service boundaries that give your teams real independence. Everything is documented, versioned, and built to last.

The essentials of API and Microservices

  • We build REST and GraphQL APIs, API-first, and cut service boundaries so teams gain real independence.
  • We document and agree each interface before coding starts, so frontend, backend, and partner teams work in parallel.
  • Clear version rules and phase-out periods protect dependent systems from breaking changes and give them time to migrate.
  • We choose the communication pattern — direct REST/gRPC calls or async messaging — based on your needs for consistency and speed.
  • We generate OpenAPI specs, run interactive doc portals, and provide example requests and SDKs, so integrations succeed fast and without errors.
Define your API strategy

Your API landscape grew over time — undocumented, inconsistent, and hard for new partners to use.

Breaking changes keep causing outages in dependent systems because there is no version concept.

New teams need weeks to understand the APIs because the docs are outdated or missing.

API-first Design

We document and agree each interface before coding starts. Frontend, backend, and partner teams can then work in parallel. Integration problems surface early — not late in the project, when they cost the most to fix.

Versioning and Stability

An API that changes without notice puts every dependent system at risk. We set up clear version rules and fair phase-out periods, and keep changes backward-compatible. Dependent teams get time to migrate without pressure.

Service Communication

REST, gRPC, or async messaging? We pick the pattern that fits your needs for consistency and speed. Event-based messaging decouples services and makes the system more robust. Direct calls stay where an instant answer is needed.

Documentation and Developer Experience

An API is only as good as its docs. We generate OpenAPI specs, run interactive doc portals, and provide example requests and SDKs. Your developers and outside partners can connect fast and without errors.

API-First process

The interface is defined before any code exists. API-first means contract, docs, and review come before development. Teams work in parallel, and integration errors surface early instead of late.

  1. Domain boundaries

    Draw service boundaries along business domains, not technical layers.

  2. Contract design

    Write the API spec (OpenAPI / GraphQL schema) and align with consumers before coding starts.

  3. Mock & review

    Consumers test against a mock server; feedback shapes the contract, not finished code.

  4. Implementation

    Development against the approved spec — teams start in parallel, each on its own.

  5. Versioning & rollout

    Version rules, phase-out periods, and changelogs keep all consumers stable.

Each phase builds on the last; skipping one creates technical debt.

Legacy API vs. API-First

Two ways to run an API landscape: grown over time without a plan, or methodical and API-first. The difference decides what every change costs.

Legacy APIAPI-First design
DocumentationOutdated or missingInteractive, always current
Breaking changesForce all consumers to migrate at onceVersioned, phased out with notice
Onboarding new teamsWeeks to a first working integrationDays with mock server and example requests
Parallel developmentBlocked until endpoints are completePossible once the contract is approved
Integration errorsFound late, at high costCaught early in mock review

API-first is not a one-time sprint — it is a lasting discipline.

What matters for API and Microservices

An API is a promise to everyone who uses it, and good API work treats it that way. API-first means the interface is designed and documented before coding starts. Teams can work in parallel. Integration errors show up early, when they are still cheap to fix.

The most common avoidable damage comes from missing versioning. Without versions, every change forces all consumers to migrate at once. That is how breaking changes drag dependent systems down. Clear version rules and fair phase-out periods give teams time. A risk becomes a planned transition.

API docs are not an extra — they are infrastructure. An undocumented interface is a dead end where new partners lose weeks. Interactive OpenAPI docs with example requests cut the time to a first working integration in half.

For cutting services, one rule applies: follow business domains, not technical layers. Otherwise, services that look separate end up tightly coupled again.

API-first saves integration cost

When interfaces are documented before coding starts, teams can work in parallel. Integration errors are caught early and cheaply — not late in the project.

Versioning protects dependents

An API without versions forces all consumers to migrate at once on every change. Clear version rules and phase-out periods give teams the time they need, and operations stay safe.

Documentation is infrastructure

An undocumented API is a dead end for partners and new developers. Interactive OpenAPI docs and example requests cut the time to a first working integration in half.

Services that work together

With us you're always at the forefront of enterprise software development and benefit directly from our extensive development know-how. Together we examine your business processes, identify key optimization potential and develop individually tailored solutions. Your business goals and expectations are the focal point of everything we do.

  1. Comprehensive technological expertise

    We choose the stack per project by requirement and rely on established, future-proof technologies instead of niche dependencies.

  2. Specialized in enterprise solutions

    The real lever lies in clean interfaces: we integrate deeply into ERP, CRM and third-party systems instead of isolated solutions.

  3. Years of experience in the software industry

    From requirements analysis to operation after go-live, we know the pitfalls of large software projects.

  4. Multidisciplinary expert team

    Analysis, architecture, backend and operations come together in one team, without friction between disciplines.

  5. Long-term business success

    We build maintainable foundations that grow with your company, and stay by your side with support and further development.

READY FOR SOFTWARE BUILT AROUND YOUR BUSINESS?

Profile picture of Slawa Ditzel, Executive Partner
Slawa Ditzel
Executive Partner

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Frequently asked questions

REST or GraphQL — which is better for our enterprise API?
REST works well for clear resources with predictable access. It is also easier to cache and secure. GraphQL pays off when different clients need very different data from the same sources. We help you decide based on your real needs.
How do you ensure API security?
We use OAuth 2.0, role-based access, rate limits, and regular dependency audits. Sensitive data is encrypted in transit and at rest. Security is part of the API design from day one — not a layer added later.
How do we handle breaking changes in an existing API?
Breaking changes only go into new API versions, and we announce them early. Phase-out periods have fixed timelines. We help dependent teams migrate before the old version is shut down — without time pressure.