Senior Frontend Developer (React, TypeScript)

About the role

We are looking for a Senior Frontend Developer to join Rullion - Eon’s development team. The role is a six‑month fixed‑term contract, with the possibility of extension, and works on a hybrid model (one day per week in our London office). You will build high‑performance web and mobile applications using React.js, React Native and TypeScript.

Key responsibilities

• Develop and maintain scalable web and mobile applications with React.js, React Native and TypeScript.
• Translate UX/UI designs into responsive, user‑centric interfaces.
• Write clean, modular code following industry best practices.
• Optimize applications for speed, responsiveness and scalability.
• Participate in code reviews and share knowledge with the team.
• Troubleshoot and resolve bugs throughout development, testing and production.
• Contribute to architectural decisions and technology stack choices.
• Ensure application security and robustness by adhering to best practices.

Required profile

• Proven commercial experience in front‑end development with React.js, React Native and TypeScript.
• Strong understanding of modern front‑end technologies, frameworks and best practices.
• Experience with state‑management libraries such as Redux or Recoil.
• Familiarity with RESTful APIs and third‑party service integration.
• Proficiency with Git version control.
• Solid knowledge of HTML, CSS and responsive design principles.
• Excellent debugging, performance optimisation and problem‑solving abilities.
• Ability to write clean, maintainable and well‑documented code.
• Strong communication skills and teamwork orientation.

Required skills

• React.js
• React Native
• TypeScript
• Redux / Recoil
• RESTful APIs
• Git
• HTML
• CSS
• Responsive design