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Senior Fullstack Engineer, Cross-platform

Welltech· Engineering
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RemoteFull-timePosted 4mo ago

About the role

Senior fullstack engineer responsible for cross-platform foundation (mobile, web, BFF, and infrastructure) with AI-first, agentic development approach. Owns end-to-end outcomes across the stack, builds scalable health & fitness app foundations using React Native and modern web tech, and drives AI-assisted workflows and shared platform capabilities.

Responsibilities

  • Build and evolve a cross-platform ecosystem covering mobile, web, BFF, and infrastructure layers using an AI-first, agentic development approach
  • Design scalable foundations for health & fitness applications powered by React Native and modern web technologies
  • Work directly with product, design, and marketing stakeholders to rapidly translate business needs into scalable technical solutions and experiments
  • Develop and continuously improve AI-agentic workflows across the full development lifecycle to increase team productivity, code quality, and delivery speed
  • Develop shared platform capabilities, internal tooling, CI/CD pipelines, and AI-assisted workflows that improve development speed and product quality
  • Work on native mobile integrations and advanced media experiences, including video playback, streaming, and HLS-based solutions
  • Contribute to modular architectures, reusable systems, backend-driven UI solutions, and white-label application capabilities
  • Build reliable and scalable integrations between frontend clients, BFF services, and platform infrastructure
  • Participate in architecture discussions, code reviews, documentation, and continuous improvement of engineering workflows
  • Own architectures and ensure health of seams between frontend clients, BFF, and platform infrastructure

Qualifications

  • Strong commercial experience with React Native and modern TypeScript-based application development
  • Solid understanding of full-stack architecture including mobile, web, BFF, and cloud/infrastructure layers
  • Experience building scalable cross-platform systems and shared application foundations
  • Deep understanding of software architecture, modular systems, scalability, and performance optimization
  • Experience working with CI/CD pipelines, automation tooling, and modern developer workflows
  • Strong engineering mindset focused on maintainability, reliability, testability, and fast iteration
  • Comfortable working in AI-assisted or agentic development environments and adopting new AI-driven workflows quickly
  • Experience with backend-driven UI architectures

Skills

Required:React NativeTypeScriptFull-stack architectureCI/CDAI-assisted workflows
Last updated Jul 16, 2026. Interested? Apply on the company site.
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About Welltech

Your healthy life starts with us

Welltech creates mobile apps that help millions of people worldwide stay active and improve their health 🌎 Find the one that suits you best! ​

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