Senior backend developer node.js

Senior backend developer node.js

(FinTech/ Payment processing/ Crypto)

About the project: We are a processing platform for accepting and sending cryptocurrency payments. We work with merchants worldwide: from e-commerce to iGaming. Our product is a reliable and high-load backend plus convenient tools for clients: a personal account, analytics, balance and transaction management.

• Development and enhancement of the client portal — API for the merchant's personal account and dashboards
• Design and support of REST / WebSocket API for the frontend and external integrations
• Working with transactional data: transaction history, balances, payouts, reconciliation
• Development of a role-based system, access rights, and user action audit
• Participation in the design of microservice architecture and inter-service communication
• Optimization of database queries, working with high-load scenarios

• 5+ years of backend development experience, including 3+ years with Node.js / TypeScript
• Strong command of PostgreSQL: complex queries, indexes, partitioning
• Experience designing REST API: versioning, documentation (OpenAPI / Swagger)
• Understanding of microservice architecture principles, experience with message brokers (Kafka, RabbitMQ or similar)
• Experience with Redis: caching, queues, rate limiting
• Practice in writing tests: unit, integration (Jest / Vitest)
• Understanding of financial logic: double-entry bookkeeping, data consistency, operation idempotency
• Ability to work with Docker, basic knowledge of CI/CD processes

Will be a big plus:

• Experience working with blockchain nodes or crypto SDKs (web3.js, ethers.js, BitcoinJS, etc.)
• Understanding of EVM networks structure, UTXO model, transaction confirmation mechanisms
• Experience in fintech, payment processing, or cryptocurrency projects
• Familiarity with KYC/AML processes at the integration level
• Experience with ClickHouse for analytical workloads
• Experience setting up observability: Prometheus, Grafana, structured logging

Remote | from $4000

Location: remote Salary: from $4000

• Work in a small but professional and dynamic team without bureaucracy – We value initiative, responsibility, and attention to detail
• Flexible work format: fully remote, flexible schedule
• Competitive compensation (in USD / USDT / RUB)