Full stack developer

FinTech Istanbul; London; On-site; GBP 70,000 - 90,000; Full time

Job summary

A leading fintech company based in London seeks a skilled developer with over 5 years of experience in building full-stack products. You will work with technologies like TypeScript, React, and Go to implement robust payments and blockchain integrations. A solid understanding of security practices is essential. Join a dynamic team focused on delivering innovative fintech solutions.

Qualifications

• 5+ years building full-stack products in cloud environments.
• Strength in TypeScript/React/Next.js and either Go or Node.js.
• Solid security fundamentals including OAuth2/OIDC and JWT.

Responsibilities

• Ship product features across React/Next.js and Node.js services.
• Design and evolve contracts: REST/GraphQL.
• Implement ledgered payments with correctness.

Skills

TypeScript

React

Next.js

Go

Node.js

Kubernetes

CI/CD

Security Fundamentals

Tools

AWS

GCP

GitHub Actions

Terraform

Postgres

Redis

Kafka

Terraform/Helm

Job description

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.

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).

- 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.

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