APIs
API development and integration that other systems can rely on
We design and build APIs, and the integrations behind them, so a mobile app, a partner, or a finance system can depend on the contract. The interesting work is authentication, errors, retries, and what happens when the other side is down.
- Product APIs
- Partner APIs
- System integration
- Legacy bridges
Integration is a product
A successful integration has an owner, a mapping of fields, a reconciliation report, and a defined behaviour when a record is rejected. A webhook that “usually works” is not an integration. We document the contract and test the unhappy paths.
Styles we use
HTTP APIs for most product work, events when several systems must react to one fact, and files or queues when a legacy system can only speak that way. Versioning is explicit once anyone outside the team calls the API.
A contract other systems can keep
In the first contract
- The few operations a caller actually needs
- Errors a client can act on
- Auth and a test that proves who may call
Not a public platform yet
- A version for every imagined partner
- Webhooks nobody is listening to
- A developer portal before the second consumer exists
What changes an API
Who calls it
Your own app, a partner, and a public client need different limits and different secrets.
Sync or event
A request that must finish now is not the same as a message that can wait.
Change
Say how a field can be added without breaking the caller you already have.
What an API session needs
- 01
The caller
Your app, a partner, or the public.
- 02
The operations
The few calls that must exist, not a full catalogue.
- 03
The failure
What the caller should do when you say no.
- 04
Change
How a field can be added without breaking them.
Marks an API is fit to call
- 01
The caller is known
Every request is tied to an application or a user, not an open URL.
- 02
Errors are specific
A failure says which field or rule failed, so the other team can fix the call.
- 03
A version exists
A change does not break yesterday’s caller without a named version.
- 04
The contract is written
The fields, the auth, and the errors are documented where the caller can read them.
What we build
Product APIs
The interface your web and mobile clients share, with authorization tests.
Partner APIs
Credentials, limits, and a change policy a partner can build against.
System integration
Finance, identity, payment, SMS, WhatsApp, and storage, with reconciliation.
Legacy bridges
A safer facade over a database or file drop you cannot replace this year.
How an engagement runs
- 01
List the systems and the source of truth
Which system owns the customer, the price, and the stock.
- 02
Specify failures
Timeouts, duplicates, and partial success, written down before the happy path demo.
- 03
Certify with real payloads
Samples from production-shaped data, not only from a tutorial.
Related reading
Cloud and DevOps
Environments, pipelines, and recovery designed with the application.
Secure software
Threats, access, and release checks built into the way software is made.
Java
Spring Boot services for systems that must still be clear in five years.
Node.js
TypeScript APIs for product teams that ship often.Questions we hear
Can you work with our existing API?
Yes. We review the contract, the auth, and the gaps the client teams are working around, then extend it carefully.
Do you build event-driven systems?
When the domain needs it. Events are not added for style. They are added when more than one consumer must react and a direct call would tangle the systems.
How do you handle secrets?
Credentials live in a proper store, not in the repository or the mobile app. Rotation and least privilege are part of the integration design.