Front-end Developer - Angular Web & Expo Mobile

About the job Freelance (Long-term) • Monthly Retainer · Salary range: €40 - €55K Annually (~40h/week) 1. WHAT WE DO Barter makes creator marketing as easy as ordering food. Brands post deals, creators apply, products get shipped and content gets made. No agencies. No budgets. No middlemen. The platform connects companies directly with 12,000+ content creators through product-for-content exchange. We're a product-led company that ships fast and iterates constantly. Our engineering team makes sure every feature works flawlessly across web and mobile, from real-time chat to complex media players. 2. THE ROLE We're looking for an experienced Frontend Developer to join us as a freelance contractor, working full-time hours on an open-ended, ongoing basis. You'll own features end-to-end across Angular web and Expo mobile. You'll shape component architecture, develop new features and ensure every interaction feels fast and polished. This is a hands-on role for developers who thrive on solving complex UI challenges and shipping excellent user experiences. You'll split your time between our frontend applications. Part builder, part quality guardian for everything users see and touch. What you'll do Design and implement complex features across Angular web and React Native mobile Partner with Product, Design and Backend to define requirements and ship end-to-end Build and maintain scalable component libraries with focus on consistency and accessibility Keep patterns aligned across web and mobile so nothing drifts Own features from first commit to production and beyond Conduct code reviews, document best practices and champion performance and accessibility (WCAG) Tackle technical debt, strengthen CI/CD pipelines and expand automated testing coverage Use AI tools in your workflows, aimed to enhance, not replace human thinking Technologies Tech stack you'll be working with: Web — Angular 19+ Core: Standalone components, TypeScript strict mode, Signals State: NGXS UI: Angular Material 19, SCSS Reactive: RxJS Performance: Lazy loading i18n: ngx-translate Mobile — React Native + Expo SDK 52 Core: TypeScript, expo-router State: Redux Toolkit + RTK Query Forms: Formik + Yup Lists: FlashList Design: Custom scale() system with design tokens Shared CI/CD: Git + GitHub Actions Cloud: AWS (CloudFront, S3) Real-time: WebSocket integration Testing: Jasmine/Karma (Angular), Jest + React Native Testing Library (Mobile) Principles Maintainable solutions over clever abstractions Metrics over opinions, validate assumptions with data Comment "why," not "what"—clarity over elegance Optimize aggressively, but only after profiling Testing enables fast shipping. Tests are freedom to refactor No gatekeeping, we teach patterns and tradeoffs Documentation is part of development. Two brains are better than one Deep work matters. We use Slack, but we don't expect instant responses Weekly knowledge sharing through weekly learning sessions 3. SKILLS & EXPERIENCE → 70% match? Apply. We help with the rest Experience 2-5 years of professional frontend development experience Experience building marketplaces or two-sided platform products Background in UX/UI principles with Figma expertise Angular and modern frontend mastery You've worked with Angular 17+ standalone components, TypeScript strict mode and Signals NGXS or similar state management (NgRx, Redux) is in your toolkit RxJS, lazy loading and performance patterns are second nature You know your way around Angular Material, SCSS and ngx-translate Cross-platform thinking React Native with Expo, or you're ready to learn Redux Toolkit + RTK Query, expo-router, Formik + Yup, FlashList You understand how design tokens and scale systems bridge web and mobile Expert CSS proficiency Modern CSS, SCSS and responsive patterns are your daily tools Grid, Flexbox and Custom Properties, no problem You build, document and scale design systems across platforms Performance and quality focus Bundle analysis, lazy loading, memory management and profiling tools WebSocket integration for real-time features Jasmine/Karma (Angular), Jest + React Native Testing Library (Mobile) CI/CD with GitHub Actions and AWS deployment (CloudFront, S3) Ownership and initiative You see features through from idea to impact, not just deployment You flag problems before they grow and suggest improvements without being asked You speak up when you disagree. No waiting for permission You deliver strong work on your own and thrive in a team No one here will micromanage you, and you don't need them to 4. WHAT WE OFFER Ready to do meaningful work that actually pays off? Benefits Salary range: €40 - €55k Annually with growth potential Remote work from anywhere in Portugal Modern tech stack with freedom to work with cutting-edge technologies Contract type This is a freelance / independent contractor role, not in-house employment You'll invoice Barter as a freelancer or through your own company Commitment: Full-time capacity (~40h/week) Duration: Open-ended, long-term engagement Team & Culture Zero bureaucracy and direct collaboration with founders and leadership Real influence on product and company trajectory Room to grow as the team and product scale 5. HOW TO APPLY Ready to make an impact? Join us in reshaping the creator economy. Send: Resume + GitHub/code samples + brief note (3-5 sentences) Tell us: A complex frontend challenge you've solved How you approach component architecture and design system consistency What pulls you toward this role Interview process: 1-2 weeks application to offer Technical screen (30 min) → Technical deep dive (60 min) → Final discussion (30 min)