Senior Frontend Software Engineer

PhysicsX – Senior Frontend Software Engineer – City Of London, England, United Kingdom

About UsPhysicsX is a deep‐tech company with roots in numerical physics and Formula One, dedicated to accelerating hardware innovation at the speed of software. We are building an AI‐driven simulation software stack for engineering and manufacturing across advanced industries. By enabling high‐fidelity, multi‐physics simulation through AI inference across the entire engineering lifecycle, PhysicsX unlocks new levels of optimization and automation in design, manufacturing, and operations — empowering engineers to push the boundaries of possibility. Our customers include leading innovators in Aerospace & Defense, Materials, Energy, Semiconductors, and Automotive.

Note: We are currently recruiting for multiple positions, however please only apply for the role that best aligns with your skillset and career goals.

The RoleJoin our dynamic product team in our fast growing startup, building a platform for Data Scientists and Simulation Engineers to deploy Deep Physics Models. You will be one of a small team of Front‐end Engineers, collaborating in a cross‐functional team with autonomy to drive implementation decisions. Bring your expertise in building front‐end systems, plus familiarity with micro‐frontend architectures and Kubernetes. A passion for software engineering, collaboration, and end‐to‐end ownership is key.

What you will do

Build & Evolve the Platform: Develop and maintain a frontend that supports complex ML workflows—from 3D visualizations to seamless API integrations.

Optimise User Experience: Ensure our interface is visually appealing and high‐performing using advanced caching strategies, performance monitoring, and accessibility best practices.

Drive Innovation: Leverage modern tools and architectures to integrate cutting‐edge features such as server‐side rendering (SSR) and AI‐driven enhancements.

Collaborate & Own: Work autonomously within a small, agile team, contribute ideas, experiment with innovative approaches, and take full ownership of your code from development through production.

Learn & Share: Engage in conferences and meet‐ups, share knowledge with colleagues, and continuously learn from one another.

What you will bring to the table

Core Web Technologies: HTML, CSS, JavaScript.

Frameworks & Libraries: React, TypeScript, and state management (Recoil, Redux, MobX).

Performance Optimisation: Code splitting, lazy loading, and React performance tools.

APIs & Data Handling: REST, Long Polling, WebSocket, GraphQL, caching strategies, and data‐heavy API interactions.

UX & UI: Responsive design, design systems, and prototyping (Figma, Excalidraw).

Testing & Quality: Unit and integration (Jest), E2E testing (Cypress).

Security & Accessibility: OAuth/JWT, XSS/CSRF prevention, WCAG, and ARIA.

CI/CD & Developer Tooling: NX, GitHub Actions, monorepos, pipelines, and micro‐frontend architectures.

Specific Technologies: Plotly, Echart, VTK, Three.js, WebGL, WebGPU, and WebAssembly.

What we offer

Equity options – share in our success and growth.

10% employer pension contribution – invest in your future.

Free office lunches – great food to fuel your workdays.

Flexible working – balance your work and life in a way that works for you.

Hybrid setup – enjoy our new Shoreditch office while keeping remote flexibility.

Enhanced parental leave – support for life\’s biggest milestones.

Private healthcare – comprehensive coverage.

Personal development – access learning and training to help you grow.

Work from anywhere – extend your remote setup to enjoy the sun or reconnect with loved ones.

Seniority level

Mid‐Senior level

Employment type

Full‐time

Job function

Engineering and Information Technology

Industries

Software Development

We value diversity and are committed to equal employment opportunity regardless of sex, race, religion, ethnicity, nationality, disability, age, sexual orientation or gender identity. We strongly encourage individuals from groups traditionally underrepresented in tech to apply. To help make a change, we sponsor bright women from disadvantaged backgrounds through their university degrees in science and mathematics. We collect diversity and inclusion data solely for the purpose of monitoring the effectiveness of our equal opportunities policies and ensuring compliance with UK employment and equality legislation. This information is confidential, used only in aggregate form, and will not influence the outcome of your application.

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