Senior Software Engineer I (JavaScript)

We are seeking a talented and self-motivated Frontend Software Engineer with strong skills in React and Node.js and a collaborative mindset.

You will work as part of a cross-functional product development team building modern web applications used by millions of researchers worldwide.

Our teams are actively adopting AI-assisted development practices

You should be comfortable experimenting with AI to accelerate development while applying strong engineering judgement to ensure code quality, maintainability, and performance. We are not looking for engineers who rely uncritically on AI-generated output; we are looking for engineers who use these tools to improve the quality, speed, and effectiveness of software development.

Key Responsibilities

• Work as part of a highly collaborative, cross-functional, agile product development team to develop modern responsive web applications
• Implement intuitive, interactive, and visually appealing user interfaces using React
• Work closely with UX/UI designers to translate design concepts into functional web applications
• Ensure applications are optimized for performance, accessibility, and responsiveness across devices and browsers
• Use AI-assisted development tools to help design, implement, refactor, and debug software.
• Critically evaluate, adapt, and validate AI-generated output to ensure it meets engineering and quality standards
• Help the team evolve effective AI-supported development workflows.
• Write well-tested, documented, and peer-reviewed code
• Work closely with Product Managers and QA to ensure software meets user and business requirements
• Contribute to engineering best practices, including testing, CI/CD, code review, and continuous improvement
• Support the growth of the London engineering team through collaboration, knowledge sharing, and participation in recruitment

Requirements

Core Engineering Skills

• Strong knowledge of HTML, CSS, and JavaScript
• Experience building modern web applications using React
• Experience working with Node.js, Express, or related backend services
• Experience working with RESTful APIs
• Familiarity with agile development practices such as:

• Test-Driven Development
• Pair Programming
• Continuous Integration
• Automated testing and deployment

• Strong collaboration and communication skills with a positive and constructive approach to teamwork

AI-Assisted Development Experience

We are particularly interested in engineers who actively use AI tools as part of a software engineering workflow.

Examples include:

• Experience using AI coding assistants such as GitHub Copilot, Claude Code, Cursor, Codex, or similar tools
• Comfort working in an AI-augmented development environment
• Ability to break work into well-scoped tasks that AI tools can assist with effectively
• Curiosity about how AI can improve developer productivity, experimentation, and software quality
• Enthusiasm for exploring and sharing effective ways of using AI in software engineering

Experience with these tools is valued, but curiosity and enthusiasm to learn are equally welcome.