API design
Well-structured, versioned APIs that are easy to consume and extend.
// Software · APIs
APIs that connect your whole business
Secure, documented REST and GraphQL APIs that connect shops, ERPs, apps and partners — the backbone of integrated systems.
// What you get
Our API work
Authentication
OAuth, tokens and API keys with roles and rate limiting.
Integrations
Connect Shopware, ERP, CRM, payment and shipping systems.
Webhooks & events
Event-driven webhooks so systems react in real time.
Documentation
OpenAPI/Swagger docs so any developer can integrate quickly.
Security & testing
Validated, tested and secured against common API vulnerabilities.
// Why it matters
The backbone of integrated systems
Modern businesses run on APIs — connecting the shop to the ERP, the app to the backend, and your systems to partners. Codewerk Solutions designs and builds secure, well-documented REST and GraphQL APIs in Node.js, with proper authentication, roles, rate limiting and webhooks. Every API ships with OpenAPI documentation so it's easy to integrate and maintain.
Whether you're exposing data to a partner, powering a mobile app, or tying your internal tools together, we build the API layer your architecture depends on.
// In detail
Technology, performance and SEO
What we actually do under the hood — so you can judge the work, not just the promise.
Technology & architecture
REST with a documented OpenAPI specification, versioned from day one, with meaningful HTTP status codes and error bodies a client can act on. We use GraphQL where many different clients need different slices of the same data — and REST everywhere caching matters.
Performance
REST caches beautifully at the HTTP layer: a URL is a cache key that Varnish and CDNs understand for free. We paginate everything (even a small catalogue eventually meets a client with 300,000 products), and aggregate in the database rather than pulling 40,000 rows to count them.
Security & access
OAuth2 or signed tokens, scoped permissions per client, rate limiting, and every inbound webhook signature verified — an unverified webhook endpoint is an open door that anyone on the internet can use to move your customers' orders around.
// FAQ
Frequently asked questions
REST for catalogue and checkout, where HTTP caching and simplicity win. GraphQL for internal dashboards and partner portals, where flexibility wins and traffic is predictable. Mixing both is normal and not a failure.
Yes. We reverse-engineer the current behaviour into an OpenAPI spec, flag the inconsistencies we find, and then you decide what to fix versus what to keep for backwards compatibility.
Explicitly, in the path, with a documented deprecation window. Breaking a partner's integration silently is the fastest way to lose their trust, and it is entirely avoidable.
If both sides can live with yesterday's data, the file export is the better engineering decision: fewer moving parts, easy to debug, and it fails loudly. You need an API when something has to happen within seconds — stock, orders, prices — or when the other side must ask questions your export cannot anticipate. Plenty of working integrations are still a file on an SFTP server.
Usually yes, and it is the normal case in German B2B. Older systems offer a database view, a file drop, a SOAP endpoint from another decade, or a vendor connector you pay for per interface. We wrap whatever exists behind a clean API of our own, so the ugliness stays in one documented place instead of spreading into every tool you build later.
The request is rejected at the edge with a status code and an error body naming the field, before anything touches your database. Half-written records are far more expensive than a rejected request. Every payload is validated against a schema — a system that promised you a number will eventually send an empty string, and the API has to survive that politely.
A handful of endpoints over data that already exists is a small piece of work — roughly one to three weeks including the OpenAPI spec and tests. The budget grows with the number of systems behind it and the number of exceptions your business has. Documentation is not a line item we would let you cut: an undocumented API costs more in support mails than it ever saved.
Let's talk about your project
Send a short brief — we reply within one business day.