programmatic

API Development & Integration

Integrations that hold up when the other system misbehaves.

Design and build the APIs and integrations that connect your product to internal systems and third-party platforms, with contracts, versioning, authentication, and failure handling defined up front.

Inside the delivery

A contract that survives real integration failures

Define resources, payloads, authorization, pagination and compatibility expectations with consumers. The flow below shows the main delivery stages and the evidence produced at each step.

Reference approachAdapted during discovery
  1. 01

    Contract design

    Define resources, payloads, authorization, pagination and compatibility expectations with consumers.

    Output

    API specification and consumer scenarios

  2. 02

    Service implementation

    Connect business logic and data sources with validation and consistent error responses.

    Output

    API implementation and adapter code

  3. 03

    Failure handling

    Handle timeouts, duplicate requests, rate limits and unavailable dependencies explicitly.

    Output

    Retry, idempotency and error policies

  4. 04

    Consumer validation

    Exercise contract tests, credential rotation and version changes before rollout.

    Output

    Contract test suite and integration runbook

Controls across the workflow

  • Scoped credentials
  • Request validation
  • Idempotent writes
  • Version compatibility

Decisions that shape the scope

Do we need a new API or an integration adapter?
Build a new API when you own a reusable capability. Use an adapter when connecting an existing vendor interface; its limits and version policy remain external dependencies.
How is this different from data integration?
Data integration moves data into an analytics platform so it can be reported on. API integration connects operational systems so a transaction in one becomes an action in another. The two often appear in the same programme, but the failure modes and acceptance criteria are different.

Before you commit

Is this the right engagement?

What we need from you
Consumer use cases, existing API documentation, sandbox credentials, volume estimates and third-party rate or access limits.
How you accept the work
Exercise contract tests, credential rotation and version changes before rollout. Acceptance records the tested scope, unresolved issues and the owner's decision.
Scope & alternatives
Build a new API when you own a reusable capability. Use an adapter when connecting an existing vendor interface; its limits and version policy remain external dependencies.

Overview

The integration is the product surface nobody sees

Most integration failures are not coding errors. They come from an undefined contract, a retry that duplicates a payment, an auth token nobody rotated, or a partner that changed a field without telling anyone. We design for those cases first, then build the connection.

  • 01API design, contracts, and versioning
  • 02Third-party and partner integration
  • 03Authentication, secrets, and access
  • 04Retries, idempotency, and reconciliation

Capabilities

Engineering scope and deliverables

Select the work that addresses your constraint. Responsibilities and acceptance criteria are agreed before delivery.

01

API design and delivery

Design the interface around how it will actually be consumed, then build it with the documentation, tests, and observability that make it usable by another team.

  • REST, GraphQL, and event interfaces
  • Schema and contract definition
  • Versioning and deprecation policy
  • Reference documentation
02

Third-party and partner integration

Connect to the platforms the business already runs on, including the ones with awkward rate limits, partial documentation, or sandbox behavior that differs from production.

  • Business and finance systems
  • CRM and support platforms
  • Payment and identity providers
  • Partner and marketplace APIs
03

Reliability and data integrity

Decide what happens when the other side is slow, down, or wrong, and make sure the same message arriving twice does not create two records.

  • Idempotency and deduplication
  • Retry and backoff strategy
  • Dead-letter and replay
  • Reconciliation reporting
04

Security and operations

Treat each integration as an access path into the business, with its own credentials, scope, monitoring, and owner.

  • Authentication and token rotation
  • Secrets management
  • Rate limiting and quotas
  • Monitoring and alerting

Integrations

Selected for your environment

Tools are chosen around your existing systems, access requirements and operating constraints.

Internal APIs
Business applications
CRM platforms
ERP systems
Identity providers
Payment and business systems

Frequently asked questions

Questions to resolve before starting

01

Do we need a new API or an integration adapter?

Build a new API when you own a reusable capability. Use an adapter when connecting an existing vendor interface; its limits and version policy remain external dependencies.

02

How is this different from data integration?

Data integration moves data into an analytics platform so it can be reported on. API integration connects operational systems so a transaction in one becomes an action in another. The two often appear in the same programme, but the failure modes and acceptance criteria are different.

03

Can you integrate with a partner API we do not control?

Yes, and that is the common case. Where the partner interface is unstable or poorly documented we add an adapter layer so their changes are absorbed in one place rather than spreading through your codebase.

04

What happens when the third-party system is down?

That behavior is a design decision, not an accident. Depending on the workflow we queue and replay, degrade to a manual path, or reject with a clear error, and reconciliation reporting shows what is outstanding once service returns.

05

Do you work on existing APIs or only new ones?

Both. Existing interfaces are often the starting point, and the first task is usually documenting the real contract, adding tests around current behavior, and introducing versioning before changing anything.

06

Who owns the integration after launch?

Ownership is agreed as part of delivery, including monitoring, credential rotation, and the escalation path. Where you need that responsibility carried, it can be covered by an application support engagement.

07

What should we prepare for the first technical discussion?

Consumer use cases, existing API documentation, sandbox credentials, volume estimates and third-party rate or access limits.

08

What evidence is available at handover?

The agreed delivery includes contract test suite and integration runbook. Exercise contract tests, credential rotation and version changes before rollout.

09

How is the engagement estimated?

We review the available inputs before estimating: Consumer use cases, existing API documentation, sandbox credentials, volume estimates and third-party rate or access limits. The proposal identifies dependencies, review milestones and excluded work; the scope determines the schedule.

Start a conversation

Discuss your next technical step

Share your current situation and the constraint you need to resolve. We will use the discovery inputs above to define a practical scope for API Development & Integration.