Role Own end‑to‑end features across the Web/Admin apps, Backend‑for‑Frontend (BFF), and core services. You’ll design APIs and data models, implement wallet/payments flows, integrate blockchain and ML inference, and raise the bar on reliability, security, and developer experience.
What you’ll do - Ship product features across React/Next.js (Web/Admin), Node.js BFF, and Go services. - Design and evolve contracts: REST/GraphQL at the edge, gRPC/events internally. - Implement ledgered payments/withdrawals with correctness (idempotency, double‑entry). - Integrate blockchain gateway, fiat rails, and AI risk/personalization services. - Drive quality: tests (unit/integration/E2E), observability, SLOs, secure‑by‑default.
What you bring - 5+ years building full‑stack products in cloud environments. - Strength in TypeScript/React/Next.js and either Go or Node.js (willing to work in Go). - API and data modeling depth; Postgres, Redis; Kafka/queues; event‑driven patterns. - Solid security fundamentals (OAuth2/OIDC, JWT, RBAC/ABAC, webhooks, OWASP). - Comfortable with Kubernetes, CI/CD, IaC; pragmatic, product‑minded, and collaborative.
Nice to have - Payments/ledger or crypto experience (EVM, custody/MPC, HSM). - ML in production (feature stores, online inference). GraphQL BFF patterns; gRPC/Protobuf; regulated fintech exposure (FCA/MiCA/MASAK).
Our stack React/Next.js, Tailwind, Node.js (Fastify/Nest) for BFF, Go for services, REST/GraphQL, gRPC/Protobuf, Postgres, Redis, Kafka, Kubernetes + service mesh, Vault + HSM/MPC, AWS/GCP, GitHub Actions, Argo CD, Terraform/Helm, OpenTelemetry, Prometheus/Grafana, Playwright/k6.
Process - Technical test (3–4 hours max) - 30-min technical deep-dive via interview - Final panel and offer
How to apply Include your CV and links (GitHub/portfolio) in your proposal.
FinTech Istanbul is an equal opportunity employer. We value diverse perspectives and support flexible work.
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