Staff Software Engineer, Growth

# ## The Role We’re looking for a Staff Engineer to join our Growth team and scale the programs that bring new members into Hinge Health. This team owns our member-to-member referral program end-to-end — the incentive mechanics, referral flows, and personalization systems that motivate existing members to refer colleagues and family members. This is a high-ownership, full-stack role. You’ll set technical direction, work closely with product and data science, and have a direct line to business outcomes like referral conversion, cost-per-acquisition, and incremental bookings. ## What You’ll Do - Own the technical direction and roadmap for the member referral platform across the full stack — from frontend experiences to backend services and data pipelines. - Scale incentive and referral systems to handle growing member volume and complexity without degrading conversion or user experience. - Integrate ML model outputs (for example, propensity scores, personalized offers, and targeting signals) into referral surfaces to improve effectiveness. - Design, instrument, and analyze A/B experiments; work with data science to close the feedback loop between model outputs and product outcomes. - Partner with product, design, and analytics to define what to build and why, balancing short-term wins with long-term platform leverage. - Raise the engineering bar by driving code quality, system design standards, observability, and technical decision-making on the team. ## What We’re Looking For - Incentive & growth experience — a track record of designing or evolving systems that measurably shift user behavior through incentives, rewards, or social mechanics. Domain background matters less than demonstrated growth impact. - Personalization at scale — experience operationalizing ML model pipelines, model serving, A/B testing infrastructure, and feedback loops that connect model performance to product outcomes. - Full-stack depth — strong skills across technologies such as React, React Native, TypeScript, NestJS, GraphQL, Node.js, relational and non-relational databases, Docker, Kubernetes, AWS, and Redis. We don’t expect a perfect match on every technology, but you should be fluent in most. - Staff-level leadership — you’ve set technical direction for a team, influenced cross-functional roadmaps, and made architectural decisions that have held up over time. ## Basic Qualifications - Bachelor’s degree (or foreign equivalent) in Computer Science, Engineering, or a related technical field. - 4+ years of professional software engineering experience, including meaningful time working on production systems at scale. - Hands-on experience building and operating full-stack applications (for example, using React/React Native on the frontend and Node.js/TypeScript or similar on the backend). ## Preferred Qualifications - Experience designing and scaling incentive, rewards, or referral systems that drive measurable user and business outcomes. - Experience integrating ML models into production systems (for example, model serving, feature pipelines, experimentation, and feedback loops). - Depth with modern web and service technologies such as React, React Native, TypeScript, NestJS, GraphQL, Node.js, relational and non-relational databases, Docker, Kubernetes, AWS, and Redis. - Proven experience setting technical direction for a team, owning architectural decisions, and driving high-quality execution in partnership with product and data science. - Experience with experimentation platforms, A/B testing frameworks, or ML feature stores. - Prior work at a consumer growth-focused company (for example, e-commerce, marketplaces, or consumer apps) and/or experience with viral or referral growth mechanics. - Experience working in healthcare or other regulated-data environments. ## Why This Role - High ownership, low bureaucracy — this team moves quickly and ships iteratively while maintaining high technical standards. - Direct, measurable impact — your work has a cle…