Blockchain.com - Back-End Engineer, Trading
Responsibilities
• Design, build, and operate backend services in Kotlin and Python that power our trading products, from core trading workflows to client-facing APIs. • Develop and improve services for order management, market data processing, and trade lifecycle handling in a real-time, high-volume environment. • Build and maintain REST APIs and WebSocket streams that deliver real-time prices, order updates, and account data. • Collaborate with cross-functional teams — product, frontend, trading — to adapt the platform quickly to new features and market conditions. • Ensure high availability, reliability, and scalability of trading services, with a sharp focus on latency, observability, and testing. • Contribute to architecture discussions and technical decisions, writing clean, maintainable code and sharing knowledge across the team. • Professional experience building backend services, ideally in Kotlin and/or Python. • Solid experience designing and building backend services and REST APIs; experience with WebSockets or other real-time streaming protocols such as NATS/JETSREAM is a plus. • Working knowledge of SQL and experience integrating with multiple internal or third-party services. • An understanding of performance fundamentals — identifying bottlenecks, managing latency, and building systems that stay responsive under load; experience with real-time or event-driven systems is a plus. • Strong problem-solving skills and clear communication with both technical and non-technical colleagues. • Curiosity and enthusiasm for learning new technologies; interest in financial markets or crypto is a plus, not a requirement. • Familiarity with Docker/Kubernetes and cloud environments (AWS) is a plus.
Benefits
• Full-time salary based on experience and meaningful equity in an industry-leading company • Role based in our London office, with a mandatory in-office presence four days per week • Work from Anywhere Policy - up to 20 days to work remotely • Budgets for learning & professional development • Unlimited vacation policy; work hard and take time when you need it • Apple equipment • The opportunity to be a key player and build your career at a rapidly expanding, global technology company in an emerging field • Flexible work culture
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