Mid-Level Frontend Developer (React/Next.js)
Up to £40000. Office based 3 days per week.
As a Mid-Level Frontend Developer, you will play a key role in developing and maintaining modern, scalable, and high-performance web applications. Working closely with designers, backend developers, and product managers, you’ll help build and optimise user interfaces while ensuring best practices and performance standards.
Key Responsibilities
Frontend Development
- Develop and maintain user-friendly interfaces using React.js and Next.js.
- Implement server-side rendering (SSR) and static site generation (SSG) with Next.js for optimised performance.
- Build reusable React components and ensure code modularity and maintainability.
- Optimise web applications for maximum speed and scalability.
- Ensure cross-browser compatibility and mobile responsiveness.
State Management & Data Handling
- Manage application state effectively using React Context, Redux, Zustand, or Recoil.
- Fetch and handle data from APIs using RESTful services or GraphQL (Apollo/Relay).
- Work with caching strategies for improved performance (e.g., SWR, React Query).
- Performance Optimization & Best Practices
- Optimise application rendering performance using memoization techniques (useMemo, useCallback, React.memo).
- Improve lazy loading, image optimization, and efficient asset management with Next.js Image component and dynamic imports.
- Write clean, reusable, and maintainable code following industry best practices and coding standards.
Testing & Debugging
- Write unit and integration tests using Jest, React Testing Library, or Cypress.
- Debug and troubleshoot UI/UX issues using browser dev tools, performance monitoring tools, and logging strategies.
- Collaboration & Agile Development
- Work in an Agile/Scrum environment, participating in standups, sprint planning, and code reviews.
- Collaborate with backend developers, UI/UX designers, and QA engineers to ensure seamless integration and a great user experience.
- Provide constructive feedback in code reviews and assist junior developers when needed.
What we need from you
Technical Skills
- React.js & Next.js – Strong experience in building and optimizing React applications with Next.js.
- JavaScript & TypeScript – Proficiency in JavaScript (ES6+) and experience with TypeScript for type safety.
- State Management – Experience with Redux, Context API, Zustand, or Recoil.
- CSS & Styling – Familiarity with CSS-in-JS (styled-components, Emotion), Tailwind CSS, or SCSS.
- API Integration – Experience integrating RESTful APIs and GraphQL.
- Performance Optimization – Understanding of server-side rendering (SSR), static site generation (SSG), and client-side rendering (CSR).
- Testing – Experience with Jest, React Testing Library, Cypress, or other frontend testing tools.
- Version Control – Proficiency with Git, GitHub/GitLab, and working with branching strategies.
- Deployment & CI/CD – Basic understanding of CI/CD workflows, Vercel, Netlify, or AWS for Next.js deployment.
Soft Skills
- Problem-Solving – Ability to debug and find solutions independently.
- Communication – Effectively collaborate with team members and explain technical concepts clearly.
- Continuous Learning – Eagerness to learn and improve frontend skills and stay updated with new technologies.
- Attention to Detail – Writing clean, well-structured, and maintainable code.
Nice to Have (Bonus Skills)
- Ecommerce experience
- Agency experience
- Working with any MVC backend framework using PHP
- Understanding of accessibility standards
- Experience with Shopify
- Department
- Frontend
- Locations
- Liverpool, Leeds
About Velstar
Velstar is a dedicated commerce agency with an unbeatable range of specialist talent. Offering end-to-end support for brands across design, development and marketing, we’re helping to build, grow and scale brands that want to be household names. With clients spanning a range of verticals, including Castore, Neom, Avon, McLaren, Tangle Teezer, Nandos, Watco, Euro Car Parts and many more, we’re partners in commerce for some of the UK and Europe’s best loved brands.
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