Software Engineer, Foundations

Skip to main content📊 AI analytics use case: how Mercor unlocked $100M in revenue🤯  Generative data apps: Gorgeous, interactive dashboards and apps you can build with just a prompt📖 State of Data Teams 2026 discover key insights from data leaders 🙏 It's just "Hex"! Not "HEX" or "Hex dot tech"📊 AI analytics use case: how Mercor unlocked $100M in revenue🤯  Generative data apps: Gorgeous, interactive dashboards and apps you can build with just a prompt📖 State of Data Teams 2026 discover key insights from data leaders 🙏 It's just "Hex"! Not "HEX" or "Hex dot tech"📊 AI analytics use case: how Mercor unlocked $100M in revenue🤯  Generative data apps: Gorgeous, interactive dashboards and apps you can build with just a prompt📖 State of Data Teams 2026 discover key insights from data leaders 🙏 It's just "Hex"! Not "HEX" or "Hex dot tech"📊 AI analytics use case: how Mercor unlocked $100M in revenue🤯  Generative data apps: Gorgeous, interactive dashboards and apps you can build with just a prompt📖 State of Data Teams 2026 discover key insights from data leaders 🙏 It's just "Hex"! Not "HEX" or "Hex dot tech"📊 AI analytics use case: how Mercor unlocked $100M in revenue🤯  Generative data apps: Gorgeous, interactive dashboards and apps you can build with just a prompt📖 State of Data Teams 2026 discover key insights from data leaders 🙏 It's just "Hex"! Not "HEX" or "Hex dot tech"📊 AI analytics use case: how Mercor unlocked $100M in revenue🤯  Generative data apps: Gorgeous, interactive dashboards and apps you can build with just a prompt📖 State of Data Teams 2026 discover key insights from data leaders 🙏 It's just "Hex"! Not "HEX" or "Hex dot tech"Open RoleSoftware Engineer, FoundationsSF, NYC, or Remote (US)About the teamThe Foundations team builds and evolves the application-level infrastructure that powers Hex. We own the shared backend systems, frameworks, and primitives that other teams depend on—helping the company move faster while maintaining reliability, performance, and security.Our work spans APIs, realtime transport, storage frameworks, background processing, and internal tooling. Rather than shipping isolated features, we focus on creating durable systems that scale with the company and make product development easier for everyone.About the roleWe’re looking for a Senior Backend Software Engineer to help design, maintain, and evolve the core systems used across Hex. This role is centered on backend architecture and shared infrastructure, with responsibility for APIs, realtime communication, data access frameworks, job orchestration, and internal admin tooling.You’ll work closely with product engineering teams to understand their needs, then turn common patterns into robust, reusable systems. You’ll help define standards, influence architecture, and raise the quality bar across the backend.Frontend experience is helpful for understanding end-to-end workflows, but this role is primarily backend-focused.Core ContributionsYou will help contribute to and evolve several foundational areas, including:APIsGraphQL(schema design, performance, developer ergonomics)Authentication & authorization(security, scalability, correctness)Multiplayer & collaboration APIs(realtime state, concurrency)TransportWebSockets and realtime communication infrastructureStorage FrameworksPostgres (schema design, query optimization, migrations)S3, DynamoDB, RedisJob & Workflow SystemsBullMQ and background job processingTemporal or similar workflow orchestration systemsInternal ToolingInternal admin tools for debugging, operations, and customer supportWhat You'll DoDesign and build backend frameworks and services used across the companyOwn and evolve critical shared systems, including APIs, realtime transport, and job orchestrationImprove reliability, performance, observability, and security of foundational backend infrastructurePartner with product teams to turn recurring needs into shared abstractionsLead technical design discussions and...