Job Description About Us We deliver next-gen movement-health insights through computer-vision assessments, wearable integrations, and a multi-platform product lineup (React dashboard, native iOS & Android apps). As feature momentum accelerates—affiliates, RevenueCat paywalls, Rook wearable data, expanded admin tooling—we’re adding a dedicated backend engineer to keep our API layer fast, secure, and developer-friendly. Why We Need You Our lead backend developer is at capacity. You’ll step in as a force-multiplier: designing new services, refactoring legacy endpoints, and championing first-class documentation so that our mobile and web teams can move without friction. Core Responsibilities Green-field APIs Design and implement RESTful endpoints that power new features across: Affiliate revenue engine and Branch deep-link tracking Rook wearable data ingestion (Apple Health, Oura, Whoop) QR-code Single-Sign-On between mobile and iPad apps RevenueCat webhooks and subscription analytics Legacy Cleanup & Optimization Audit existing Hapi JS routes and Knex queries to eliminate N+1 issues and long-tail latency. Migrate ad-hoc Insomnium collections into a maintainable Postman (or similar) workspace with environment variables, test suites, and shared documentation. Infrastructure & DevOps Own AWS deployment pipelines using ECS/Fargate, API Gateway, and Lambda when appropriate. Harden security by enforcing IAM least-privilege, using Parameter Store/Secrets Manager, and managing PostgreSQL roles. Instrument observability with CloudWatch and Grafana; set SLIs and SLOs. Documentation & Collaboration Write clear, versioned API documentation (OpenAPI/Swagger) and changelogs. Run knowledge transfer sessions and code reviews for junior developers as needed. Respond promptly in Slack and GitHub, explaining trade-offs in plain English. Day-to-Day Stack Language / Runtime: JavaScript (ES2023), Node.js 20 Frameworks: Hapi JS, Knex JS, Serverless Framework (nice to have) Database: PostgreSQL 15 (includes partitioning, RLS, PostGIS in places) Cloud: AWS (ECS, Lambda, S3, API Gateway, RDS/Aurora, CloudFront) Tooling: GitHub Actions, Grafana, Postman, Swagger/OpenAPI, Jest, Terraform Collaboration: Jira, Figma, Confluence, Slack Must-Have Qualifications 5+ years building and scaling APIs in Node.js (Hapi or Express). Strong SQL skills and experience with advanced PostgreSQL features (indexes, query plans, roles, migrations). Production experience on AWS (CI/CD, container orchestration, secrets management). Proven ability to write clear and developer-centric documentation. Comfortable replacing or refactoring Insomnium collections and rolling out collaborative workflows in Postman or similar tools. Clear written and spoken English; capable of distilling complex backend concepts for frontend/mobile teams. Nice-to-Have Extras Experience designing GraphQL gateways or Backend-for-Frontend (BFF) architectures. Familiarity with event-driven systems (SNS/SQS, webhooks, or Kafka). Background working with subscription billing (Stripe, RevenueCat) or affiliate tracking. Exposure to on-device ML workflows and media pipelines. Proficiency in TypeScript and experience with migration planning.