Welltech - Senior Fullstack Engineer, Cross-platform
Requirements
• Modular, reusable systems. Backend-driven UI, white-label capabilities, and the architectural choices that let one team’s work compound for the next. • Modular, reusable systems • Reliable integrations. Between frontend clients, BFF services, and platform infrastructure, with you on the hook for the health of the seams. • Reliable integrations • The engineering culture. Architecture discussions, code reviews or pairing when working on trunk based development workflows, documentation, and continuous improvement, leading by what you ship and how you ship it. • The engineering culture • 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 • Experience building white-label mobile applications or multi-brand ecosystems • Experience designing and implementing BFF (Backend for Frontend) services • Hands-on backend development experience with TypeScript (Node.js) • Experience building internal developer platforms, shared tooling, or scalable platform capabilities • Familiarity with OWASP mobile security best practices • Experience with engineering methodologies focused on rapid iteration and high developer productivity (Trunk Based Development, CI/CD mindset, TDD, BDD, XP, etc.) • Strong experience with native mobile integrations and media/video playback technologies • Hands-on experience with HLS streaming and native video player integrations on iOS and Android (AVPlayer, ExoPlayer, Chromecast, AirPlay) • Candidate journey: ⭕️ Recruiter call --> ⭕️ Meet a Hiring Manager--> ⭕️ Skills assessment-->Live coding • Candidate journey: • Check out some of our products • Muscle Booster — https://musclebooster.fitness/ • Yoga-Go — https://yoga-go.io/ • WalkFit - http://walkfit.pro
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
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