GGES · Technology

Senior FinTech Integration & Full-Stack Engineer — BizFi MVP

Full-Time / Contract-to-Hire / MVP EngagementHybrid / RemoteSeniorOpen roles

Role overview

Senior integration/full-stack engineer for BizFi MVP: secure partner APIs, signed webhooks, canonical transaction models, idempotency, state machines, reconciliation, auditability, resilient full-stack flows and production observability.

Responsibilities

Connect BizFi to X-fi, Ampli-fi, Infinifi/LendLink, Hermes and finance/lender systems; own canonical models, provider adapters, OAuth/API auth, signed webhooks, submission state, reconciliation, retries/idempotency, operator UI, approvals and trace visibility.

Required skills

Webhook authenticity
Webhook idempotency
Canonical financial model
Transaction state machines
Reconciliation
Ledger consistency
API error contracts
Retry and backoff policy
Authentication and secrets
Compliance integration boundaries
Sensitive payment data minimization
Transaction UX
Audit trails
Partner API versioning
Integration observability

Preferred skills

TypeScript/Node.js + React/Next.js preferred, or Python backend + strong React; REST/JSON, webhooks, OAuth2, PostgreSQL/SQL, queues, state machines, API versioning, Git and testing. FinTech experience is highly preferred but exceptional integration engineering can compensate.