Senior Frontend Engineer at AECOM in London, England, United Kingdom

companyDescription Work with Us. Change the World. At AECOM, we're delivering a better world. Whether improving your commute, keeping the lights on, providing access to clean water, or transforming skylines, our work helps people and communities thrive. We are the world's trusted infrastructure consulting firm, partnering with clients to solve the world’s most complex challenges and build legacies for future generations. There has never been a better time to be at AECOM. With accelerating infrastructure investment worldwide, our services are in great demand. We invite you to bring your bold ideas and big dreams and become part of a global team of over 50,000 planners, designers, engineers, scientists, digital innovators, program and construction managers and other professionals delivering projects that create a positive and tangible impact around the world. We're one global team driven by our common purpose to deliver a better world. Join us. jobDescription In AECOM’s AI Engineering team your code will directly shape the physical world around us. We build AI-driven technology that revolutionises how infrastructure and buildings are designed and engineered; reducing waste, cutting CO₂, and making the built environment more efficient and sustainable. This is where software has measurable, real-world impact. With our AI Engineering team we’ve created a unique setup: a lean, highly technical team with the speed and ownership of a start up, backed by the scale, resources, and domain expertise of one of the world’s leading engineering firms. There has never been a better time to be at AECOM. We are leading the industry’s AI transformation, and with our people and technology we deliver excellence and innovate with impact. We invite you to bring your bold ideas and big dreams to solve the world’s most complex challenges. We're one global team driven by our common purpose to deliver a better world. Join us. What You’ll Do As part of an AI-first engineering team, you will own the frontend experience of our AI-driven products, collaborating closely with AI/ML engineers to bring advanced capabilities to life through polished, high-performance interfaces. You will work primarily with Svelte and React (TypeScript) to build the tools that thousands of engineers use daily, turning complex AI and engineering outputs into intuitive, delightful user experiences. This is a frontend-focused role. While you will interact with backend services and APIs, the core of your work will be crafting exceptional user interfaces and frontend architecture. Design, build, and maintain rich, interactive user interfaces using Svelte and React (TypeScript), delivering production-grade frontend experiences that surface complex AI and engineering data Collaborate closely with product managers, ML engineers, and backend engineers to define and ship high-impact frontend features end-to-end Translate complex AI and engineering outputs into clear, interactive, and highly usable components with strong attention to UX, performance, and accessibility Own frontend architecture decisions including state management, component design, and design system development Drive technical excellence by improving frontend architecture, performance and bundle optimisation. Take ownership of frontend features from concept to deployment, influencing product direction, interaction design, and technical trade-offs. Build high-performance, interactive 2D and 3D web experiences for complex engineering visualisations qualifications Must-Haves Proven and demonstrable hands-on experience building production applications with TypeScript (Svelte or React) Degree in computer science, software engineering, or a related technical field or equivalent demonstrable experience Deep understanding of modern frontend architecture, component design patterns, and state management Strong web fundamentals: HTML, CSS, browser APIs, performance, and accessibility Experience consuming and integrating REST APIs and real-time data into frontend interfaces Familiarity with frontend build tooling (Vite, SvelteKit, or similar) and testing frameworks Preferred Skills Experience writing automated tests (unit, integration, e2e). Familiarity with Python backend services (enough to read, debug, and contribute to APIs you consume) Knowledge of design systems and frontend architecture best practices additionalInformation Our Hiring Process 25-minute screening call Take-home challenge: A hands-on task to assess your problem-solving and technical skills Combined technical and cultural interview (in-person) Whiteboard Interview: 1-hour with 2 of our engineers to discuss your solution to the take-home challenge Culture fit: 30-minute meeting with our leadership team Why Join Us? Work on real-world problems where AI creates measurable impact. Be part of a team where your work matters, and your ideas become real. Collaborate with sharp, driven colleagues in a culture of trust, ownership, and high standards. Contribute to making the built environment smarter and more sustainable. About AECOM AECOM is proud to offer comprehensive benefits to meet the diverse needs of our employees. Depending on your employment status, AECOM benefits may include medical, dental, vision, life, AD&D, disability benefits, paid time off, leaves of absences, voluntary benefits, perks, flexible work options, well-being resources, employee assistance program, business travel insurance, service recognition awards, retirement savings plan, and employee stock purchase plan. AECOM is the global infrastructure leader, committed to delivering a better world. As a trusted professional services firm powered by deep technical abilities, we solve our clients’ complex challenges in water, environment, energy, transportation and buildings. Our teams partner with public- and private-sector clients to create innovative, sustainable and resilient solutions throughout the project lifecycle — from advisory, planning, design and engineering to program and construction management. AECOM is a Fortune 500 firm that had revenue of $16.1 billion in fiscal year 2025. Learn more at aecom.com. What makes AECOM a great place to work You will be part of a global team that champions your growth and career ambitions. Work on groundbreaking projects—both in your local community and on a global scale—that are transforming our industry and shaping the future. With cutting-edge technology and a network of experts, you’ll have the resources to make a real impact. Our award-winning training and development programs are designed to expand your technical expertise and leadership skills, helping you build the career you’ve always envisioned. Here, you’ll find a welcoming workplace built on respect, collaboration and community—where you have the freedom to grow in a world of opportunity. We are a Disability Confident Employer and will offer an interview to applicants who have a disability or long-term condition, who meet the minimum/essential criteria for the role. Please let us know using this email address ReasonableAccommodations@aecom.com  if you would like to apply through the Disability Confident Interview Scheme. All your information will be kept confidential according to EEO guidelines.