Backend Engineer

A high-growth, performance-driven technology company focused on sleep fitness is looking for a Senior Software Engineer to help expand product capabilities and scale its backend systems. The team builds advanced hardware, software, and AI technology to deliver personalized, data-driven sleep experiences to users worldwide. In this role, you will work on distributed backend systems that power critical business logic and enable communication across embedded, machine learning, mobile, and business

About the team The 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

About the Job: LaunchDarkly is hiring a Backend Software Engineer to join our Flag Delivery team. Serving data to our customers is the core of our product and we're expanding the team to add bandwidth and energy. The team is very senior, and this role is for someone eager to learn and grow as the team balances modernization with resilience and operational improvements. In this role, you'll build and improve backend services that sit directly on LaunchDarkly's critical delivery path, partner cl

About the Job: Software powers the world, and LaunchDarkly empowers teams to deliver and control it safely. As a Senior Backend Engineer on the Data Platform team, you will help build and operate the distributed data infrastructure that moves, stores, and serves large volumes of product data across LaunchDarkly. Our systems support customer-facing product capabilities across Experimentation, Metrics, Release Guardian, Observability, AgentControl, and other areas that depend on reliable data. Y