From custom software and cloud to consulting and nearshoring, Isatis is your complete IT partner. We build scalable, reliable solutions, from first concept to go-live.
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We design and build secure, well-documented APIs that let your applications, partners and platforms exchange data in a controlled, reliable way.We ontwerpen en bouwen veilige, goed gedocumenteerde API's waarmee je applicaties, partners en platforms op een gecontroleerde, betrouwbare manier gegevens uitwisselen.
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Projects Delivered
100+
REST fits most public and partner APIs; GraphQL fits front-ends that need flexible queries; event-driven APIs fit systems that must react to changes without polling. The right choice depends on your use case and who will consume the API.
Good APIs start with good design. We define clear contracts, consistent naming and logical resource structures before we write code. Versioning and backward compatibility are part of the design from the start, so partners can rely on interfaces that hold when you ship new features.
We secure an API with authentication on every endpoint, rate limiting, strict input validation and audit logging, and we test it against the OWASP guidelines before it goes live. Security is part of the design and the pipeline.
APIs are a gateway to your data, and we treat them that way. As an ISO 27001 certified partner, security is embedded in how we develop, and monitoring shows unusual traffic early.
Good API documentation is interactive and generated from the code, so it is always current, with working examples, clear error descriptions and a sandbox to try calls safely. A developer should be able to make a first successful request without emailing anyone.
An API is only as useful as its documentation. We deliver interactive, auto-generated docs, plus SDKs, code samples and Postman collections when they make sense for your consumers. If an API is hard to integrate, people find a workaround or do not use it.
We version APIs explicitly, keep old versions running for an agreed period and announce deprecations early, so consumers migrate on their own schedule. Automated tests check every change against the contract.
APIs need to perform under load and keep working as they grow. We build with caching, asynchronous processing and horizontal scaling in mind, so peak traffic does not bring things down. Where AI drafts test cases from the contract, an engineer reviews each one first.
With Codex, Isatis connects to around ten of the largest HR cloud platforms. Codex reads employee changes from those systems and writes data back, so much of the manual Excel work in HR administration disappears. The integrations work out of the box, so data moves between a customer’s HR systems and Codex from day one.
Tell us which systems need to exchange data and who will consume the API. Book a 15-minute call. We reply within 24 hours.
Schedule a callAPI development is designing, building, securing and documenting the interfaces through which applications exchange data, so that other systems, partners or front-ends can use your functionality without knowing its internals. Our API development services cover the whole lifecycle, versioning and monitoring included.
API development creates a new interface on your side; API integration connects your systems through interfaces that already exist, yours or a third party’s. Most projects need both, and at Isatis the same team does both.
Yes, and it is often the first step in a modernisation: a stable API in front of the old system lets new applications use it while the system behind it is replaced step by step. See legacy modernization.
Yes. We start with a review of the contract, the security setup and the documentation, then agree what needs fixing first, usually tests and monitoring.
Both. External and partner APIs need stricter authentication, rate limits and documentation because you do not control the consumers; internal APIs can be lighter but still need clear contracts.
Modernising ageing systems step by step, keeping the business logic you depend on.
Read moreConnecting your existing systems, third-party services and data sources.
Read moreWeb and back-office applications built around your processes, from prototype to production.
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