Front-end Developer - Angular Web & Expo Mobile

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)