Enterprise Software: API and Microservices

API andMicroservices

Well-designed APIs and clearly bounded microservices are the backbone of modern enterprise systems. We develop RESTful and GraphQL APIs on an API-first principle and design service boundaries that give teams genuine independence — cleanly documented, versioned, and built for longevity.

Challenges you'll recognise

  • Your API landscape grew organically — undocumented, inconsistent, and hard for new integration partners to access.
  • Breaking changes in APIs regularly cause outages in dependent systems because no versioning concept exists.
  • New teams need weeks to understand the API structure because documentation is outdated or nonexistent.

API-first Design

Interfaces are documented and agreed upon before implementation begins. That enables frontend, backend, and third-party teams to work in parallel and prevents integration problems that would otherwise only surface late in the project — when they are most expensive to fix.

Versioning and Stability

APIs that change without notice endanger every dependent system. We establish clear versioning strategies, deprecation cycles, and backward-compatible change policies so dependent teams can migrate without being placed under time pressure.

Service Communication

Whether synchronous REST or gRPC calls, or asynchronous messaging systems — we choose the communication pattern based on your consistency and latency requirements. Asynchronous event architecture decouples services and increases resilience; synchronous communication remains where immediate responses are required.

Documentation and Developer Experience

An API is only as good as its documentation. We generate OpenAPI specifications, maintain interactive documentation portals, and provide example requests and SDKs — so internal developers and external integration partners can connect quickly and without errors.

Good to know

API-first saves integration cost

When interfaces are documented before implementation begins, teams can work in parallel. Integration errors that would otherwise surface late in the project are caught early and inexpensively.

Versioning protects dependents

APIs without a versioning concept force all consumers to migrate synchronously on every change. Clear versioning strategies and deprecation cycles give dependent teams the time they need without endangering operations.

Documentation is infrastructure

An undocumented API is a dead end for integration partners and new developers. Interactive OpenAPI documentation and example requests measurably halve the time to a first successful integration.

Frequently asked questions

REST or GraphQL — which is better for our enterprise API?
REST suits clearly defined resources with predictable access patterns and is simpler to cache and secure. GraphQL pays off when different clients need strongly varying data volumes from the same sources. We help you make the decision based on your actual requirements.
How do you ensure API security?
Through OAuth 2.0, role-based access controls, rate limiting, and regular dependency audits. Sensitive data is encrypted in transit and at rest. Security is not a retrofitted layer — it is part of the API design from the start.
How do we handle breaking changes in an existing API?
Breaking changes belong exclusively in new API versions and are communicated early. We introduce deprecation cycles with defined timelines and support dependent teams in migrating before the old version is decommissioned — without placing them under pressure.
Why nextlevels

Success you can measure

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 — established, future-proof technologies instead of niche dependencies.

  2. Specialized in enterprise solutions

    Deep integration into ERP, CRM and third-party systems instead of isolated solutions — the real lever lies in clean interfaces.

  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 from a single source — no friction at the seams 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?

Whether you want to optimize existing systems or introduce new digital solutions – we'd love to meet you and explore new paths together. An initial conversation is the foundation for your success.

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

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