Senior Fullstack Engineer

Location: Remote - Europe preferred, must be able to work European hours Remote | Full-time Compensation: $120K - $150K

Our client is a dynamic, forward-thinking, fully remote organization with an ambitious roadmap and a strong commitment to engineering excellence. Seeking a Senior Fullstack Engineer to work at the intersection of frontend and backend development. In this role, the engineer will build and maintain both a React-based trading user interface and the TypeScript backend services that power high-performance trading platforms. The position involves full feature ownership—from crafting responsive, real-time interfaces to designing the APIs, data pipelines, and indexing solutions that feed them. The ideal candidate possesses a strong passion for trading, engineering rigor, security, and velocity, backed by over six years of professional experience and a dedication to code quality and state-of-the-art software testing practices.

Key Responsibilities Frontend Development & Performance • Build and maintain the React-based trading user interface. • Implement dynamic, interactive interfaces for real-time data, including live order book updates, price feeds, and trade executions via WebSockets. • Own component architecture, state management, and responsive design. • Optimize rendering, minimize load times, and ensure smooth, low-latency interactions under heavy data loads. • Collaborate closely with product and design teams to translate complex requirements into intuitive user interfaces.

Backend Development & Data Infrastructure • Design and maintain TypeScript services, including REST APIs, WebSocket servers, and background services. • Design and deliver event-driven pipelines that ingest and process pricing and account data. • Own REST and WebSocket API contracts (OpenAPI / AsyncAPI specs), ensure smooth data flow between frontend and backend, and maintain API documentation. • Interact with on-chain data, index blockchain events, and bridge smart contracts with off-chain services.

Quality, Security & Collaboration • Develop and maintain comprehensive unit, integration, and end-to-end tests across frontend and backend systems. • Uphold continuous integration (CI) quality gates and rigorous code review standards. • Work closely with cross-functional teams, including product, design, and quantitative specialists.