Senior Fullstack Engineer: AI-Driven, Cross-Platform

Welltech; United States; Remote; USD 140,000 - 200,000; Full time

Job summary

Welltech, a global wellness technology company, is seeking a Product Engineer mindset role to own outcomes across the stack—from mobile to infrastructure—driving AI-first, agentic development. You will collaborate with product, design, marketing, and data to turn bets into running experiments and ship features with measurable impact.

You’ll focus on building scalable foundations for health & fitness apps, improving development velocity with AI-assisted workflows, and delivering reliable

Qualifications

• Strong commercial experience with React Native and TypeScript-based app development.
• Solid understanding of full-stack architecture across mobile, web, BFF, and cloud.
• Experience building scalable cross-platform systems and shared foundations.
• Experience with CI/CD pipelines and modern developer workflows.
• Engineering mindset focused on maintainability, reliability, and fast iteration.
• Familiarity with AI-assisted or agentic development environments.

Responsibilities

• Build and evolve a cross-platform ecosystem covering mobile, web, BFF, and infrastructure.
• Design scalable foundations for health & fitness apps using React Native and web tech.
• Translate business needs into scalable technical solutions and experiments with stakeholders.
• Improve AI-agentic workflows across the full development lifecycle to boost productivity.
• Develop shared platform capabilities, internal tooling, and CI/CD pipelines.
• Work on native mobile integrations and media experiences (video, streaming).
• Contribute to modular architectures and backend-driven UI solutions.
• Build reliable integrations between frontend clients, BFF services, and infrastructure.
• Participate in architecture discussions, code reviews, and documentation.

Skills

React Native

TypeScript

Full-stack architect

AI workflows

Code quality

Architecture design

Performance optimization

CI/CD

Tools

Node.js

ExoPlayer

AVPlayer

Job description

Welltech, a global wellness technology company, is seeking a Product Engineer mindset role to own outcomes across the stack—from mobile to infrastructure—driving AI-first, agentic development. You will collaborate with product, design, marketing, and data to turn bets into running experiments and ship features with measurable impact.

You’ll focus on building scalable foundations for health & fitness apps, improving development velocity with AI-assisted workflows, and delivering reliable