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UX/UI Frontend Developer

Job Overview

Location

Serbia

Job Type

Full-time

Category

Frontend Engineer

Date Posted

April 22, 2026

Full Job Description

📋 Description

  • As a Mid-Level UX/UI Front-End Developer at Ruby Labs Ltd., you will bridge the gap between design and technology to build visually stunning, intuitive, and high-performing user interfaces that directly impact engagement and business outcomes across health, education, and entertainment products.
  • You will create UI concepts from scratch using AI-powered tools like Claude, v0.dev, and Figma AI, implement responsive designs in Next.js 16+, TypeScript, and Tailwind, build reusable component-based structures, manage client and server state with Zustand and TanStack React Query, integrate A/B testing solutions, and add UI animations using Framer Motion.
  • You will join a fast-paced, innovative product engineering team at Ruby Labs, a leading tech company driving consumer-led products in health, education, and entertainment, where collaboration with Product, Design, and Engineering teams is essential to transform high-fidelity mockups into production-ready code.
  • You will gain ownership over end-to-end UI delivery, sharpen your skills in modern frontend architecture, deepen expertise in performance optimization and accessibility, and grow your impact by shaping user experiences that drive conversion and retention in SaaS environments.

Skills & Technologies

JavaScript
TypeScript
Go
Ruby
React
Frontend
Remote

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Ruby Labs Ltd.
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About Ruby Labs Ltd.

Ruby Labs Ltd. is a London-based product studio that builds and scales consumer subscription mobile and web applications. The company focuses on health, wellness, and productivity verticals, developing apps such as Hint, Able, and the award-winning fitness platform FitCoach. Using data-driven growth and proprietary technology, Ruby Labs rapidly prototypes, launches, and iterates products to serve millions of global users. The team combines engineering, product design, and performance marketing expertise to create sustainable digital businesses. Founded in 2018, Ruby Labs operates a portfolio of self-funded apps, emphasizing user privacy, scientific validation, and long-term customer value.

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