Paths, payloads and errors written down before coding spreads
Services
API integration
Contracts, auth and tests between systems. We write the interface so the next team is not guessing.
Engineering
The join has to be honest
API integration is development, joining, testing, documentation and the later optimisation of the interfaces between systems. SJ Technologies writes the contract of the API so the next team is not guessing: paths, auth, versioning, error behaviour and what a timeout means.
We integrate with the systems you already run — ledgers, CRMs, carriers, payments, identity — rather than inventing a second stack for a demo. New APIs are built when the existing one cannot tell the truth.
Tests cover the cases that fail in production: expired tokens, partial writes, duplicate webhooks. Optimisation comes after the interface is honest, not before.
Tokens, keys and who may call what, named in the scope
The failures that happen in production, not only the happy path
Notes the next engineer can pick up without a call to us
The work around an API
New interfaces
REST or similar, versioned, with auth and errors the caller can handle.
Read moreSystems you already run
CRM, ERP, payments, identity and the warehouse links an order actually needs.
Read moreTesting
Contract tests and the ugly cases: retries, duplicates, a partner who is down.
Read moreRelease
Environments that match, secrets that are not in the repo, and a rollback you have tried.
Read moreWhat you can hold us to
API development, integration, testing and documentation. Auth, versioning and error behaviour named up front. Tests against the cases that fail in production. Optimisation after the interface is honest, not before.
Products that live on joins
North Ledger reads the ledgers the finance team already keeps. The portal is not a second set of books.
Continue
Related services
Next step
Talk to the agency
Use the contact form for web, mobile or software enquiries. We reply within two working days.