Senior Fullstack Engineer, Cross-platform

WellTech Limited

Job Overview

Location

Bulgaria

Job Type

Full-time

Full Job Description

📋 Description

• Senior Fullstack Engineer role focused on building and evolving a cross-platform ecosystem for wellness apps, driving outcomes through AI-first, agentic development and end-to-end ownership.
• Day-to-day responsibilities include designing scalable foundations for health & fitness apps using React Native and modern web technologies, collaborating with product, design, and marketing to translate business needs into technical experiments, improving AI-agentic workflows across the SDLC, developing shared platform capabilities and CI/CD pipelines, working on native mobile media integrations (video playback, streaming, HLS), contributing to modular architectures and backend-driven UI, ensuring reliable integrations between frontend, BFF, and infrastructure, and participating in architecture discussions, code reviews, and continuous improvement of engineering practices.
• WellTech Limited is a global wellness technology company with Ukrainian roots, operating hubs in Cyprus, Ukraine, Poland, Spain, and the UK, serving over 25.5 million users worldwide through apps like Muscle Booster, Yoga-Go, and WalkFit, combining market leader scale with startup agility to build and scale wellness apps via tech-driven performance marketing.
• The role offers the opportunity to shape engineering culture, drive measurable outcomes through experimentation, master AI-assisted development workflows, own cross-platform systems from ideation to production, and grow technical leadership by influencing architecture, tooling, and team productivity in a high-impact, product-driven environment.

🎯 Requirements

• 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

🏖️ Benefits

• Opportunity to work on wellness apps used by over 25.5 million people globally
• Hybrid work environment across international hubs in Cyprus, Ukraine, Poland, Spain, and the UK
• Exposure to cutting-edge AI-agentic development workflows and internal tooling innovation
• Ownership of end-to-end technical outcomes with direct impact on product and user health metrics
• Collaborative, product-driven culture with close interaction across product, design, marketing, and data teams
• Continuous learning in scalable platform engineering, modular systems, and modern DevOps practices

Skills & Technologies

JavaScript

TypeScript

React

Node.js

Full Stack

Senior

Onsite

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WellTech Limited

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About WellTech Limited

WellTech Limited is a Cyprus-based holding company that builds and operates a portfolio of mobile health, fitness, and wellness applications. Its brands include BetterMe, Muscle Booster, Yoga-Go, and WalkFit, serving over 200 million users worldwide. The company focuses on AI-driven personalized programs for weight management, mental health, physiotherapy, and activity tracking, combining science-backed content with behavioral coaching. Revenue is generated through freemium subscriptions and in-app purchases across iOS and Android platforms.

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