Backend Engineer (Node.js / TypeScript) - Crypto Trading Platform

Build the core engine of a regulated digital asset platform.
 

We’re building a next-generation, regulated crypto platform focused on fiat on/off-ramps and Spot trading. Unlike many crypto startups, we are not experimenting - we are building a production-grade, compliant system designed for scale, auditability, and long-term growth.

As a Backend Engineer, you won’t be maintaining legacy APIs or writing simple CRUD endpoints. You’ll design and build the financial core of the platform - the services responsible for trading, ledger integrity, wallet management, and integrations with global providers.

Our stack is modern. Our architecture is clean. Our ambition is serious.

Responsibilities

• Designing and developing backend services (API-first architecture)
• Building trading, wallet, and ledger modules
• Integrating with OKX (REST/WebSocket), Fireblocks, Sumsub, and banking connectors
• Ensuring transactional integrity and financial correctness
• Implementing authentication, MFA, session management
• Creating audit logs and compliance-ready flows
• Writing clean, testable, maintainable TypeScript code
• Participating in architecture discussions and technical decisions
  
   

Your Role

• As a Senior Backend Engineer, you’ll:
• Design modular backend services in Node.js & TypeScript
• Build a high-integrity double-entry ledger system
• Implement trading order lifecycle (validation → routing → fills → reconciliation)
• Develop exchange adapters (OKX first, more later)
• Ensure idempotency for all financial operations
• Implement Redis-based quote locking for conversions
• Support mobile-first API architecture (versioned, backward compatible)
• Collaborate with frontend and mobile teams
• Contribute to infrastructure and deployment decisions
• You will own meaningful parts of the system - not just tickets.

Requirements

• 3+ years of backend development experience
• Strong Node.js and TypeScript expertise
• Experience with relational databases (PostgreSQL or similar)
• Understanding of transactions, concurrency, idempotency
• Experience integrating third-party APIs
• Knowledge of Redis and caching strategies
• Experience building secure authentication systems (JWT, refresh tokens, MFA)
• Strong communication skills in English (B2+)

Will be a plus

• Experience in FinTech / crypto / trading platforms
• Familiarity with exchange APIs (OKX, Binance, etc.)
• Experience building financial ledger systems
• Knowledge of message queues (Kafka, RabbitMQ, SQS)
• Experience with cloud infrastructure (AWS preferred)
• Understanding of reconciliation processes in financial systems
• Experience building Admin panels with RBAC

We Offer

• Office, Hybrid –  flexible hours
• Collaborate with top-tier clients
• 18+4 paid days off, no matter your contract
• Lawyer Services
• Accounting Support
• MacBook Pro + premium tools
• Annual learning budget (including GenAI courses or conferences)
• Career growth path
• Projects with visible, real-world impa