API Development & Integration
APIs that connect everything — fast, secure, reliable.
Custom REST APIs, GraphQL endpoints, webhook systems, and third-party integrations — engineered for performance, security, and developer experience.
Why leading companies choose us
What you get that a generic api development & integration vendor does not.
Contract first
The API shape is agreed and documented before implementation, so consumers can build in parallel.
Built for the failure case
Retries, idempotency and dead-letter handling designed in, because integrations fail more than they succeed cleanly.
Documentation that stays true
Generated from the schema, so it cannot drift from what the API actually does.
Versioned from the first release
Breaking changes are planned events with a migration path, not surprises for whoever depends on you.
Observability on every call
Latency, error rates and payload traces available before a partner reports a problem.
Rate limiting and auth done properly
Keys, scopes, quotas and rotation designed once rather than assembled during an incident.
How we build
API Development & Integration built on foundations that hold
Schemas as the source of truth
OpenAPI or GraphQL schema drives the code, the docs and the client libraries together.
Idempotency by default
Every write operation is safe to retry, which is what makes an integration survive real networks.
Backwards compatibility
Additive change wherever possible, with deprecation windows long enough to be honest.
Security at the boundary
Authentication, input validation and least-privilege scoping applied consistently at the edge.
What you get
- Custom REST APIs with clean resource design, pagination, filtering, and versioning baked in
- GraphQL APIs so clients request exactly what they need — no over-fetching, no wasted bandwidth
- Third-party integrations with Stripe, Twilio, Salesforce, HubSpot, and hundreds of other platforms
- Event-driven webhook systems with reliable delivery, retry logic, and dead-letter queues
- API gateway security — rate limiting, OAuth2/JWT authentication, and API key management
Custom api development & integration for you
The capability most clients come to us for, and the work that surrounds it.
Our flagship capability
API development services
REST and GraphQL APIs designed contract-first, documented from the schema, and instrumented so you can see what every consumer is doing. Built to be integrated against by teams you will never meet.
Key features
- OpenAPI or GraphQL schema first
- Idempotent, retry-safe writes
- Generated docs and client libraries
- Per-consumer rate limits and quotas
- Tracing on every request
01
Third-party integration
Connecting the platforms you already pay for, including the ones with unpleasant APIs.
02
Webhook and event systems
Reliable delivery, replay and signature verification, so consumers can trust your events.
03
Legacy API modernisation
Putting a documented, versioned interface in front of a system that never had one.
04
Middleware and orchestration
The layer that sequences calls across systems and reconciles when one of them fails.
How we work
Every stage, and what it produces
The same nine stages on every engagement. What changes is what each one has to answer for api development & integration.
Business evaluation
01Who consumes this API, what they need from it, and what breaking them would cost.
Information gathering
02The systems it has to reach, their real rate limits, and their actual failure behaviour.
Consultation
03A design session that settles the contract before any implementation starts.
Designing the UI
04Documentation and examples designed alongside the schema, not written afterwards.
User experience
05Developer experience tested by having someone outside the project integrate against it.
Tech inspection
06An audit of existing endpoints, auth and traffic patterns before anything changes.
Development
07Endpoints delivered in slices, each one documented and deployable on its own.
QA and testing
08Contract tests, load tests and deliberate failure injection on the integration paths.
Support and care
09Consumer documentation, a versioning policy, and a deprecation process in writing.
Everything we hand over at the end is listed on the handoff page.
When this is the right fit
Straight answers on where this service earns its cost — and where it does not.
- API-First Architecture — We design the contract before writing a single line — your API is the product, not an afterthought.
- Battle-Tested Security — OAuth2, rate limiting, and input validation ship with every endpoint — security is default, not optional.
- Sub-100ms Response Times — Aggressive caching, query optimization, and connection pooling keep your APIs blazing fast under load.
- Comprehensive Documentation — Every API ships with OpenAPI specs, interactive docs, and SDKs — your developers onboard in minutes.
Track record
- 15+
- Years shipping software
- Alian Software since 2010
- 84%
- Retainer renewal rate
- Clients who extend past the first term
- 4–8
- Weeks to first production ship
- Typical fixed-fee sprint
Sample builds
Shapes of work we ship most often in this pillar.
Payment gateway integration hub
Unified API layer abstracting Stripe, PayPal, and regional payment providers — one interface for your app, multiple processors behind it.
ERP-to-ecommerce sync
Real-time bidirectional sync between SAP/NetSuite and Shopify — inventory, orders, customers, and pricing always in lockstep.
Public developer API
Versioned REST API with OAuth 2.0, rate limiting, webhook subscriptions, and an interactive developer portal with sandbox environment.
Tech we reach for
Chosen per project. We will tell you when the boring option is the right one.
- Node.js / Express / Fastify
- Python / FastAPI
- GraphQL / Apollo
- PostgreSQL / Redis
- RabbitMQ / Kafka
- Docker
- AWS API Gateway
Related projects
Work we have shipped in this discipline.
A Teaching Web and Mobile Portal
As it is convenient for learners to gain knowledge of any subject, any topic anytime being anywhere, online learning has become the go-to choice for education.
Comprehensive Student Visa Management Web Application
ERFOLG is a consultation company that guides students who want to pursue their career in Germany. We built a complete visa management portal with document tracking and scheduling.
Industries we work with
We understand the constraints before we write the first line.
E-commerce & D2C
Storefronts, catalogue tooling, and the support layer around them.
B2B SaaS
Multi-tenant products, dashboards, and in-app AI features.
Manufacturing
Plant floor visibility, quality, and ERP-adjacent systems.
Healthcare
Clinical and back-office tooling under real compliance constraints.
Finance & fintech
Audit-traceable workflows where every decision has to be explainable.
Logistics
Routing, exception handling, and document-heavy operations.
Client reviews
What our clients are saying
Reviews from clients we have delivered for.
Got questions? We have answers.
- REST for most cases — simpler, well-understood, great tooling. GraphQL shines when you have multiple frontend clients with very different data needs, or when over-fetching is a real performance problem.
No obligation, no deck
Talk to a human about this
Tell us the problem. If api development & integration is not the right answer, we will say so and point you at what is.
24h
Typical reply time on weekdays
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