Senior Fullstack Engineer, Cross-platform
Welltech · Remote · Cyprus · Ukraine ·
COMPENSATION
€•• – ••k
Listed on the employer's job board (Ashby)
- Senior Fullstack Engineer
- Fully remote role
- React Native + TypeScript
- AI-first development
- Cross-platform focus
Join Welltech as a Senior Fullstack Engineer to shape the technical foundation of global wellness applications like Muscle Booster and Yoga-Go. You will own the end-to-end ecosystem, from mobile clients to backend services, focusing on scalable architecture and AI-driven development workflows.
This position emphasizes outcome-based engineering, requiring close collaboration with product and design teams to translate business goals into technical solutions. You will drive improvements in developer productivity and platform reliability while ensuring high-quality media experiences for millions of users.
What you'll do
- Build and evolve cross-platform ecosystems covering mobile, web, BFF, and infrastructure
- Design scalable foundations for health and fitness apps using React Native
- Collaborate with stakeholders to translate business needs into technical experiments
- Improve AI-agentic workflows across the development lifecycle to boost productivity
- Develop shared platform capabilities, internal tooling, and CI/CD pipelines
- Handle native mobile integrations for video playback, streaming, and HLS
- Contribute to modular architectures and backend-driven UI solutions
- Ensure reliable integrations between frontend clients and platform infrastructure
What you'll need
- Strong commercial experience with React Native and TypeScript
- Solid understanding of full-stack architecture including cloud layers
- Experience building scalable cross-platform systems and shared foundations
- Deep knowledge of software architecture, scalability, and performance
- Proficiency with CI/CD pipelines and modern developer workflows
- Focus on maintainability, reliability, testability, and fast iteration
- Comfortable working in AI-assisted or agentic development environments
- Experience with backend-driven UI architectures
Nice to have
- Experience building white-label mobile apps or multi-brand ecosystems
- Background in designing and implementing BFF services
- Hands-on backend development with TypeScript and Node.js
- Experience building internal developer platforms or shared tooling
- Familiarity with OWASP mobile security best practices
- Knowledge of Trunk Based Development, TDD, BDD, or XP methodologies
- Strong experience with native mobile integrations and media playback
- Hands-on experience with HLS streaming and native video players
Stack
- React Native
- TypeScript
- Node.js
- HLS
- CI/CD
How you'll work
- Fully remote position
- Global team with hubs in Europe and UK
Hiring process
- Recruiter call
- Meeting with Hiring Manager
- Skills assessment
- Live coding session