The integration layer that stops your systems drifting apart
Every business accumulates a patchwork of tools that do not talk to each other: a CRM that has to be updated by hand, an ERP with no API, a warehouse that runs on CSV exports. We build the connective tissue properly — versioned, documented, observable and tested against the failure cases, because integrations fail at 2am on a Friday and nobody documented what should happen next.
Engagement
A single integration is typically 2–5 weeks. A full API platform — design, versioning, docs, SDKs and partner onboarding — is scoped as discovery plus sprint delivery.
What you get
Deliverables, not adjectives
This is what lands in your hands at the end. If something is missing from this list, it was not in scope — and we will say so before we start rather than after.
RESTful or GraphQL API with a versioning strategy that lets you deprecate without breaking clients
OpenAPI specification, generated interactive docs, and SDKs for your main languages
Third-party integrations: payments, CRM, ERP, accounting, logistics, marketing tools
Webhooks with signed payloads, exponential-backoff retries and a dead-letter queue
Idempotency keys on write endpoints, so a retried request never double-charges or double-sends
Rate limiting and per-client API keys, with usage visibility
Contract tests and a mocked dependency suite, so one upstream change cannot break your build
When to call us
The situations where this is the right conversation
If you recognise one of these, that is probably enough to justify a 30-minute call.
01
Your systems require re-keying data by hand
Manual re-keying is where data errors come from. We automate the path between your systems and keep a reconciliation report so you can see what matched and what did not.
02
One vendor's API change broke production
That is an integration with no contract tests and no version pinning. We add both, plus alerting on error-rate shifts so the next change is caught before your customers notice.
03
Your API is slow and you cannot tell why
We add distributed tracing and query-level instrumentation, then fix the actual bottleneck. Often it is N+1 queries or a missing index, not the architecture everyone is blaming.
04
Nobody outside your team can build against your API
Good documentation, sensible naming, sensible errors and real examples turn an internal API into something partners can self-serve — which is usually the actual goal.
How we build it
The tools we would reach for
Not a shopping list. These are what we would actually pick for this kind of work, and we will tell you if a different tool fits your constraints better.
- Node.js
- TypeScript
- Python
- FastAPI
- Laravel
- GraphQL
- PostgreSQL
- Redis
- RabbitMQ
- OpenTelemetry
Examples
The shape of work this usually turns into
Illustrative scenarios, kept anonymous. Specific case studies with client names and evidenced metrics appear on our work page as clients approve them.
ERP to storefront synchronisation
Two-way product, stock and price sync between an ERP and a headless storefront, with a reconciliation report and a dead-letter queue for anything that fails. Re-keying went to zero.
- ERP
- Two-way sync
- Reconciliation
Payment and billing integration
Subscription billing with idempotent charge endpoints, webhook-driven fulfilment and a dunning flow for failed payments — built so a retried webhook can never double-bill.
- Payments
- Idempotency
- Webhooks
Public API with partner self-service
A documented, versioned REST API replacing a manual process for trade partners, with API keys, usage dashboards and contract tests across five client integrations.
- Public API
- Versioning
- Contract tests
Questions
APIs & integrations: what buyers ask
Straight answers, including where the answer is that you probably do not need this.
Both. Most engagements are the second kind: your systems stay as they are and we build the reliable path between them. We will tell you when a vendor API is genuinely the problem and a different tool would serve you better.
We isolate third-party calls behind our own layer with timeouts, retries with backoff and circuit breaking, so an upstream outage degrades one feature instead of failing requests. Changes get caught by contract tests before they reach production.
Idempotency keys on every write endpoint, unique constraints at the database level, and webhook handlers that are safe to replay. A retried request returns the original result rather than doing the work twice.
An OpenAPI spec, generated interactive documentation that cannot drift from the code, and examples for your main languages. Delivered as part of the build, not as a paid extra.
Related
Often needed alongside this
Got a apis & integrations project in mind?
Send us the problem and the constraint. You will get a written responsewithin one uk business day, uk hours, 9:00-18:00, monday to friday, and an honest view on whether we are the right fit.