Job Title: Senior Full Stack Developer (Front End Leaning) Job DescriptionWe are seeking a Senior Full Stack Developer with a strong focus on frontend development to join our team. You will play a pivotal role in modernising our trading platform, moving it from a legacy monolithic C# architecture to a cutting-edge microservices-based ecosystem. A key project involves developing a new Regulatory Reporting Portal for external customers, driven by regulatory changes and strategic objectives to outperform competing exchange offerings. Responsibilities Design and develop modern React-based user interfaces for a new customer-facing regulatory reporting platform. Build features end-to-end from Figma designs through to production deployment. Integrate frontend applications with Spring Boot microservices and REST APIs. Collaborate with backend engineers to define contracts, troubleshoot integrations, and deliver seamless user experiences. Develop reusable component libraries and design patterns using Storybook. Ensure high standards around testing, quality, performance, and maintainability. Contribute to architectural discussions as the platform evolves away from legacy technologies.Essential Skills 8+ years of software engineering experience. Strong React and TypeScript development experience. experience building complex enterprise-grade web applications. Strong understanding of REST APIs and microservice architectures. experience integrating frontend applications with backend systems. Ability to understand API contracts, data flows, and backend integration patterns. Strong understanding of testing, state management, and frontend architecture. experience working from Figma designs and collaborating with UX teams.Additional Skills & Qualifications Development experience with Spring Boot. experience with Linaria. Familiarity with AG Grid Enterprise. Background in trading, exchange, or capital markets. experience working on high-performance, data-heavy applications.Why Work Here?Join a forward-thinking team dedicated to innovation and excellence in the trading platform industry. Benefit from a culture that encourages collaboration, continuous learning, and professional growth. Enjoy the opportunity to work on challenging projects and contribute to shaping the future of trading technology. Work EnvironmentOur work environment is dynamic and supportive, with cutting-edge technologies and tools. Developers have access to modern equipment and resources to facilitate high-quality work. The position involves working closely with a talented engineering team, with flexibility in working hours to promote work-life balance. Location London, UK Rate/Salary 500.00 - 700.00 GBP Daily Trading as TEKsystems. Allegis Group Limited, Maxis 2, Western Road, Bracknell, RG12 1RT, United Kingdom. No. (phone number removed). Allegis Group Limited operates as an Employment Business and Employment Agency as set out in the Conduct of Employment Agencies and Employment Businesses Regulations 2003. TEKsystems is a company within the Allegis Group network of companies (collectively referred to as "Allegis Group"). Aerotek, Aston Carter, EASi, Talentis Solutions, TEKsystems, Stamford Consultants and The Stamford Group are Allegis Group brands. If you apply, your personal data will be processed as described in the Allegis Group Online Privacy Notice available at (url removed)> To access our Online Privacy Notice, which explains what information we may collect, use, share, and store about you, and describes your rights and choices about this, please go to (url removed)> We are part of a global network of companies and as a result, the personal data you provide will be shared within Allegis Group and transferred and processed outside the UK, Switzerland and European Economic Area subject to the protections described in the Allegis Group Online Privacy Notice. We store personal data in the UK, EEA, Switzerland and the USA. If you would like to exercise your privacy rights, please visit the "Contacting Us" section of our Online Privacy Notice at (url removed)/en-gb/privacy-notices for details on how to contact us. To protect your privacy and security, we may take steps to verify your identity, such as a password and user ID if there is an account associated with your request, or identifying information such as your address or date of birth, before proceeding with your request. If you are resident in the UK, EEA or Switzerland, we will process any access request you make in accordance with our commitments under the UK Data Protection Act, EU-U.S. Privacy Shield or the Swiss-U.S. Privacy Shield