01 — The problem
Integrations that fail silently.
A connector drops records when one API is slow, retries create duplicates, and nobody notices until a customer complains.
Reliable integration needs things connectors rarely give you: idempotency, ordered processing, back-off on rate limits, dead-letter queues and logs searchable by record.
02 — What we build
What the engagement delivers.
Webhook receivers
Endpoints that verify signatures, acknowledge quickly and queue work for processing.
Queue-based sync
Jobs processed with retries and exponential back-off, with failed jobs parked in a dead-letter queue for replay.
Transformation
Mapping and validation between systems, versioned and tested.
APIs for your systems
REST or GraphQL APIs over your data, documented in OpenAPI, with authentication and rate limiting.
Observability
Structured logs searchable by record ID, alerts on failure rates and a replay tool.
03 — Configuration vs custom
What is set up, and what is written.
Configuration
- Hosting on your cloud account
- Secrets management
- Monitoring and alert channels
Custom development
- Middleware services and workers
- API design and documentation
- Test suites against sandbox APIs
- Replay and admin tools
04 — Typical effort
What it usually takes.
Ranges from comparable projects. You get a fixed-scope quote after a 30-minute call.
05 — What you own
Yours at handover.
- Source code in your repository
- Infrastructure in your cloud account
- OpenAPI documentation
- Runbooks
FAQ
Questions about custom API development.
Where is the middleware hosted?
In your cloud account (AWS, Azure, Google Cloud or Cloudflare), so you own it and can move it.
What is idempotency and why does it matter?
It means processing the same event twice has the same effect as once. Webhooks are often delivered more than once, so without it you get duplicates.
How do you handle API rate limits?
Queues control throughput, and requests back off when a system signals it is overloaded.
Can you document an API for partners?
Yes, in OpenAPI with examples, authentication guides and a sandbox.
Next step
Start with a 30-minute call.
Tell us what you run today and where it breaks. You get a fixed-scope quote afterwards. We don’t publish rates, because the honest price depends on scope.
Enquire
Talk to us about Custom API & middleware development.
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