API and message design
Resource models, events, versioning, validation, errors, pagination, filtering and backward compatibility.
Integration architecture
Make systems exchange information reliably and visibly.
I design integration contracts and operating controls across modern applications, legacy platforms and third-party services so that data moves with clear ownership, security and recovery behaviour.
Integration designContract Trust Timing Resilience Truth Visibility
More than connecting two endpoints.
A production integration must define meaning, trust, timing, failure, retry, reconciliation, monitoring and responsibility—not only payload shape.
Identity and access
Authentication, service identity, scopes, roles, tenant context, token handling and least privilege.
Sync and async choices
Decide when a request must complete immediately and when queues, events or delayed processing are safer.
Retries and idempotency
Prevent duplicate outcomes, manage timeouts, backoff, dead letters, replay and partial failure.
Ownership and reconciliation
Identify the source of truth, state transitions, mismatch handling and repair responsibilities.
Logs and observability
Correlation identifiers, structured logs, metrics, alerts and evidence for end-to-end transactions.
Practical integration range
Modern, legacy and third-party environments.
Integration work in my portfolio includes authenticated APIs, payment-related flows, Microsoft Graph, messaging, Meta webhooks, accounting-connected commerce processes, synchronisation jobs and legacy database behaviour.
- REST and JSON API contracts
- OAuth-style and token-based identity flows
- JWT, JWKS and role-aware context
- Webhooks and callback verification
- RabbitMQ and asynchronous processing
- Scheduled synchronisation and reconciliation
- Microsoft Graph and authenticated email services
- WhatsApp Cloud API webhook patterns
- Accounting and commerce data hand-offs
- Legacy database and application integration
Integration workflow
A controlled path from dependency to reliable service.
Map the business transaction
Identify the outcome, actors, systems, data, timing and decision that cross the boundary.
Define ownership and trust
Clarify sources of truth, service identity, permissions, privacy and who resolves disputes.
Choose the interaction pattern
Select request-response, webhook, event, queue, scheduled synchronisation or a combination.
Design failure behaviour
Specify validation, timeouts, retries, duplicate prevention, reconciliation, alerts and manual recovery.
Prove the end-to-end flow
Test happy paths, degraded dependencies, malformed data, replay, security and production observability.
Integration quality
The questions every hand-off must answer.
Who?Which identity may perform the action?
Whose truth?Which system owns the data?
What if?How does failure recover safely?
How seen?What evidence proves the transaction?
Integration assessment
Bring the unreliable hand-off, duplicated process or blocked data flow.
We can map the transaction, expose the hidden dependencies and define a safer integration contract.