Lead Frontend Engineer (Next.js, React)

What You'll Do

• Lead the development of modern, scalable frontend applications using Next.js 16 App Router with React Server Components

• Translate product and design requirements into high-quality, responsive, and accessible UI using CSS Modules and Radix UI components

• Own frontend architecture decisions, including state management (Context API, TanStack Query, Apollo Client), component design patterns, and performance optimization

• Collaborate with designers to ensure pixel-perfect and user-friendly interfaces, building reusable components in Storybook

• Optimize applications for speed, scalability, and cross-browser compatibility using Lighthouse, Web Vitals, and bundle analysis

• Work closely with backend engineers to integrate GraphQL and REST APIs, implementing efficient data fetching with Apollo Client and TanStack Query

• Implement comprehensive testing strategies using Vitest, Testing Library, and Playwright for E2E testing

• Drive best practices in clean code, TypeScript strict mode, performance optimization, and frontend observability with OpenTelemetry

• Conduct thorough code reviews and mentor engineers within the team, fostering a culture of technical excellence

• Stay up to date with evolving frontend technologies and propose improvements to our tech stack and development practices

Requirements:
• 6+ years of experience in software engineering, with a strong focus on frontend development

• Expert-level proficiency with React 19 including hooks, Server Components, and modern patterns

• Experience with Next.js 16 App Router, SSR/SSG, routing, middleware, and Server Actions

• Advanced TypeScript 5+ skills with strict mode configuration and complex type systems

• Strong understanding of HTML5, CSS3, CSS Modules, PostCSS, responsive design, and cross-browser compatibility

State & Data Management

• Experience with React Context API for building provider patterns and global state

• Solid knowledge of TanStack Query (React Query) for server state management and caching strategies

• Apollo Client experience for GraphQL integration and cache management

• Proficiency integrating GraphQL APIs with code generation (GraphQL Code Generator)

Code Quality & Testing

• Strong experience with testing frameworks: Vitest, Testing Library, and Playwright

• Expertise with ESLint, Prettier, Stylelint for maintaining code quality

• Solid knowledge of frontend performance optimization techniques and Web Vitals

Build Tools & Package Management

• Proficiency with pnpm (or npm/yarn) for mono-repo and dependency management

Soft Skills

• Strong problem-solving skills and attention to detail

• Excellent English communication skills and ability to work in cross-functional teams

• Proven ability to make sound architectural decisions for scalable applications

• Experience conducting code reviews and providing constructive feedback

Advanced Next.js & React

• Experience with React Server Components architecture and optimization patterns

• Deep understanding of Next.js middleware, edge functions, and Vercel platform features

• Knowledge of internationalization (i18n) implementation with next-intl

UI/UX & Design Systems

• Experience building or contributing to design systems or component libraries

• Familiarity with Radix UI, Framer Motion, or similar headless UI libraries

• Strong accessibility (WCAG) knowledge and implementation experience

• Experience with Storybook for component development and documentation

Forms & Validation

• Experience with React Hook Form and schema validation libraries like Zod

• Building complex, accessible forms with proper validation patterns

Performance & Observability

• Experience with Lighthouse CI, performance budgeting, and optimization workflows

• Familiarity with OpenTelemetry, distributed tracing, and frontend monitoring

• Knowledge of Vercel Speed Insights or similar performance monitoring tools

E-commerce & High-Traffic Applications

• Experience working on customer-facing e-commerce products (retail, fashion, high-end brands)

• Knowledge of shopping cart logic, product catalogs, wishlist features, and loyalty programs

• Understanding of payment systems and secure checkout flows

• Experience with analytics implementation and tracking (GTM, custom analytics)

• Understanding of Webpack configuration and bundle optimisation

Third-Party Integrations

• Experience with feature flag systems (LaunchDarkly or similar)

• Integration with Google Maps API, hCaptcha, or other third-party services

• Knowledge of SEO best practices and structured data (schema.org)

Advanced Testing & Quality

• Experience setting up CI/CD pipelines (Bitbucket Pipelines, GitHub Actions)

• Knowledge of E2E testing strategies at scale

• Experience with visual regression testing in Storybook

• Experience with Git hooks (Husky), lint-staged, and conventional commits

DevOps & Deployment

• Familiarity with Vercel, AWS, GCP, or Azure platforms

• Understanding of edge computing and serverless architectures

• Experience with environment management across multiple deployment stages

Leadership & Mentorship

• Previous mentoring or technical leadership experience

• Experience leading frontend architecture decisions in a team environment

• Track record of establishing coding standards and best practices

• Contribution to open-source projects or technical community involvement

Additional Skills

• Experience with GraphQL schema design and optimization

• Knowledge of security best practices (XSS protection, CSP, authentication)

• Familiarity with advanced animation libraries (Framer Motion, GSAP)

• Understanding of carousel/slider implementations (Embla, Swiper)

• Experience with gesture handling and touch interactions for mobile

Benefits:
About Mindera

At Mindera, we craft software with people we love.

We are 1000+ techies working from anywhere in the world who love to implement the best engineering practices and use the latest tech stack to deliver web and mobile applications for over 100 well-known international clients since we started.

We partner with our clients to understand their products and deliver high-performance, resilient and scalable software systems that create an impact on their users and businesses across the world.

You get to work with a bunch of great people, and the whole team owns the project together.

Our culture reflects our lean and self-organisation attitude. We encourage our colleagues to take risks, make decisions, work in a collaborative way and talk to everyone to enhance communication.

We are proud of our work, and we love to learn all and everything while navigating through an Agile and collaborative environment.

Before applying, get to know how we hire and take a look at our Handbook!

Our offices are located in: Portugal (Aveiro, Coimbra, Porto) | UK (Leicester) | USA (San Diego, San Francisco) | India (Bengaluru, Chennai) |Romania (Cluj-Napoca) | Brazil (Blumenau)