Full Stack Developer

Listed as a remote role based in Warsaw, Mazowieckie, Poland. We are hiring a Senior Software Engineer to join a fast-growing AI HealthTech startup backed by founders who previously built one of Europe's largest consumer technology companies and investors behind several global unicorns. This is a high-impact product engineering role where you'll own features end-to-end across web, mobile, backend, infrastructure, and internal tooling. You'll work in a small, highly autonomous engineering team building an AI-powered health platform used by consumers worldwide. If you enjoy fast execution, product ownership, and building across the full stack while leveraging AI development tools daily, this role is for you. DetailsLocation: Remote in Ukraine/EU Employment Type: Full-Time Experience Level: Senior (5+ years) Industry: AI / HealthTech / Consumer Mobile Work Environment: Small, fast-moving product team Key Responsibilities Own product features from design through production Build web and mobile applications using React and React Native (Expo) Develop backend services with NestJS, PostgreSQL, and Redis Build and maintain internal Python tools Design and improve APIs, subscriptions, payments, and webhooks Develop and maintain cloud infrastructure using Terraform and GCP Collaborate closely with Product and Engineering to deliver high-quality features Continuously improve system performance, scalability, and developer experience Leverage AI coding tools as part of your daily workflow Requirements 5+ years of software engineering experience Strong experience with React and React Native / Expo Production experience shipping mobile apps to TestFlight and/or Google Play Strong Node.js experience with NestJS (or similar opinionated framework) Experience Building Subscription Or Payment Systems (Stripe Preferred) Experience with PostgreSQL and ORMs (TypeORM, Prisma, Drizzle) Ability to write raw SQL when needed Experience with Docker and CI/CD Experience working in cloud environments (preferably GCP) Professional English Nice to Have Healthcare or HealthTech experience GDPR or HIPAA compliance exposure Native iOS/Android debugging (Xcode, Android Studio) Experience with Fastlane Product analytics experience (Amplitude or similar) Infrastructure as Code using Terraform Python for automation or internal tooling Who We're Looking For High-output engineer who enjoys moving fast Strong ownership mindset with minimal supervision Comfortable in early-stage startup environments Curious about AI and actively using modern AI development tools Resilient, adaptable, and eager to solve complex product challenges Product-minded engineer who cares about user experience as much as code quality Benefits 33 paid days off per year Flexible public holidays In-house wellness program with medical consultations Opportunity to build an AI-first consumer product from an early stage Small, high-caliber engineering team with significant ownership Interview Process Technical Interview (30–45 min) Technical Interview (30–45 min) Take-home assignment or live coding session (up to 4 hours) System Design Interview Final Decision Show more Show less Seniority level Not Applicable Employment type Full-time Job function Engineering and Information Technology Industries Information Services