We're looking for a midlevel or senior IC to join our Platform/API engineering team. You'll be responsible for building, maintaining, and promoting our JavaScript client library, working closely with our design team to bring production-ready interfaces to life. This role is primarily focused on TypeScript/JavaScript, with some full-stack/Python work as well. Responsibilities • Own, build, and maintain our JavaScript client library, ensuring it is robust, well-tested, and easy for external users to integrate with. • Integrate native libraries into JavaScript/TypeScript code using tools like N-API, node-addon-api, or Wasm. • Build responsive, performant front-end applications using React, Redux, Vite, Web Workers, and WebSockets. • Contribute to full-stack projects, including backend work in Python (or Rust), REST API design, and database/migration work. • Work between design and engineering teams to translate designs (e.g. Figma handoffs) into production-ready components and design systems. • Set up and maintain CI/CD pipelines, including publishing to npm. • Document components using Storybook or similar tooling. • Collaborate cross-functionally to ensure smooth feature rollouts and updates. Preferred background • Experience working between high-performing design and engineering teams, including production-ready design systems and tools (e.g. Figma handoffs). • Proficiency with React, Redux, Vite, Web Workers, and WebSockets. • Background in trading, market data, or quantitative finance. • Hands-on backend experience building APIs, working with databases, and migrations. • Full-stack experience with backends in Python or Rust, including REST API design. • Familiarity with Storybook or similar component documentation tooling. • Good communication skills and work ethic for a remote workplace. Notice about phishing scams Be cautious of phishing scams impersonating Databento that offer fake job interviews and request purchases. Official emails come only from or us.greenhouse-mail.io (our ATS). Any other domains (e.g., databento-careers.com, databento.online) are fraudulent. Our recruiting data suggests that underrepresented applicants often downplay their skills. Even if your experience doesn't exactly match the qualifications listed, we still want to hear from you. Please apply!