Regulated B2B API Platform
A financial technology firm connects partners to payment and settlement capabilities, but those capabilities were exposed through a mix of legacy SOAP endpoints and one-off REST services. Partners saw inconsistent sign-in methods, unclear performance expectations, and fragmented documentation. Inside the company, teams rebuilt the same integrations repeatedly, and every new connection waited on security and compliance review.
Business impact at a glance.
Partner technical onboarding dropped from an average of 23 days to 6 days.
p99 API latency improved by 42% versus the legacy integration path under comparable load.
Support tickets related to “integration mystery” fell by 58% in the first quarter after launch.
Passed external security and architecture review without material findings on first submission.
Achieved 99.95% measured availability for the public API tier across three consecutive months.
Business Challenge
- Partners followed different integration paths by product line, which increased support tickets and slowed time-to-revenue.
- API keys and tokens were managed in multiple places, so security reviews repeatedly blocked releases.
- Heavy partner traffic caused latency spikes during critical settlement windows.
- When something failed, support could not follow a single partner request end-to-end.
- Auditors expected tamper-evident access history and a clear record of which data crossed the API boundary.
Our Approach
We ran this as a platform program: one catalog of capabilities, one partner onboarding experience, and shared ownership across architecture and security. We implemented ASP.NET Core 8 APIs behind Azure API Management (separate API products for external partners and internal teams), used Azure Service Bus for asynchronous settlement and webhooks, and stored secrets in Key Vault. OpenTelemetry tracing fed the client’s existing monitoring tools; staging included synthetic partner load and blue-green releases to reduce cutover risk.
Phase 01
Discovery & alignment
Workshops, process and systems review, success metrics.
Phase 02
Design & planning
Architecture, experience and workflow design, delivery plan.
Phase 03
Build & validation
Implementation, integration, testing, demos, refinements.
Phase 04
Go-live & enablement
Controlled rollout, training, handover, post-launch tuning.
What We Delivered
- Designed REST and async patterns (webhooks + polled status) for high-volume partner flows.
- Implemented OAuth2 client credentials with scoped API products and per-partner rate limits.
- Introduced idempotent command handlers and outbox-style publishing for critical financial messages.
- Built a partner sandbox with mock responses and contract tests aligned to OpenAPI specs.
- Automated infrastructure with Bicep and gated production releases behind approval workflows.
- Delivered runbooks and tier-1 triage dashboards tied to trace IDs and partner identifiers.
Technology Stack
For the first time we have one front door for partners, predictable performance, and traces we can hand to auditors without scrambling.
Head of Platform Engineering
Financial Technology Services
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