Build · Digital Products
API & systems integration
Connecting core systems, legacy databases and third-party services safely, observably and without fragile point-to-point links.
The challenge
Most institutions run on a mix of core platforms, packaged software and in-house systems built over decades. Data moves between them through nightly files, shared databases and undocumented scripts that only a few people understand.
These integrations are where outages, data quality problems and security gaps tend to hide. A change in one system breaks another, reconciliation takes days, and nobody can say with confidence where personal data flows.
We design integration architectures and APIs that are documented, versioned, secured and monitored, so systems can change independently and every data flow can be explained to an auditor.
Our method
How the work is done.
- 01
Integration inventory
Catalogue existing interfaces, data flows, owners and failure history to build a current-state integration map.
- 02
Target architecture
Choose patterns per flow, such as synchronous APIs, event streaming or managed file transfer, and define contracts, versioning and security.
- 03
Contract-first build
Specify APIs in OpenAPI or AsyncAPI before implementation, with contract tests that both producer and consumer run.
- 04
Security and resilience
Authentication, authorisation, rate limiting, retries, idempotency and dead-letter handling designed into every interface.
- 05
Observability and cut-over
Tracing, logging and alerting across flows, followed by staged migration using parallel runs and reconciliation.
Deliverables
What you receive.
- Current-state and target-state integration maps
- API specifications in OpenAPI or AsyncAPI with versioning policy
- Implemented integrations with contract and integration test suites
- API gateway and access policy configuration
- Data flow register suitable for privacy and audit review
- Monitoring dashboards and alert definitions for each critical flow
- Runbooks for failure handling and replay
Engagement options
Ways to buy it.
- 013–6 weeks
Integration assessment
Inventory and risk review of existing integrations with a target architecture and roadmap.
- 022–6 months
Integration delivery
Design and build of a defined set of APIs or flows, including cut-over from legacy mechanisms.
- 036–12 weeks
API platform set-up
Gateway, developer portal, standards and governance so teams can publish APIs consistently.
Standards
Frameworks we work to.
- OpenAPI Specification
- AsyncAPI
- OWASP API Security Top 10
- OAuth 2.0 and OpenID Connect
- HL7 FHIR
- ISO 20022
Questions
What buyers ask us.
Can you integrate with systems that have no API?
Yes. We use adapters over databases, files or message queues, and wrap them behind a clean API so that the legacy mechanism can later be replaced without affecting consumers.
Do we need an integration platform product?
Not always. We assess volume, complexity and team skills and recommend the simplest option that meets them, whether that is a gateway, an event broker or a commercial integration platform.
How do you avoid disrupting live services?
Through parallel running, reconciliation reports and staged cut-over with a tested rollback path for each flow.
How is sensitive data protected in transit?
With mutual TLS or equivalent transport security, scoped tokens, field-level minimisation and logging that avoids recording personal data.
Related services
Often delivered together.
Build
Identity & payments integration
Secure sign-in, national and federated identity, and payment flows integrated to the standards regulators and auditors expect.
Build
Product engineering
End-to-end delivery of web platforms and internal systems, from architecture decisions to a stable production release.
Run
Hybrid & private cloud
Architectures that keep sensitive data in-country or on-premises while using public cloud where it fits.
Discuss api & systems integration.
A senior engineer reviews every enquiry and replies within one business day.