Senior Frontend Engineer

We’re looking for a Senior Frontend Engineer who can do more than just build great UIs — someone who obsesses over design details, loves simplifying complexity, and enjoys creating systems that make the whole team better.
If you get equally excited about debugging a webpack config, perfecting that 2px border-radius, and setting up workflows where AI becomes your coding partner, we’d love to talk.

What You’Ll Do

• Build fast, elegant, and accessible frontend experiences that scale beautifully.
• Collaborate closely with designers to turn wireframes into pixel-perfect, production-ready UI. Yes you bring in standardisation of UI components to achieve this.
• Design and implement micro-frontend architectures — splitting large apps into modular, maintainable components.
• Take ownership of our build pipeline, from bundling and code-splitting to lazy-loading and caching.
• Keep our Storybook setup fresh and reliable — documenting reusable UI components and ensuring consistency.
• Write performant, testable, and maintainable code using React, TypeScript, and Node.js.
• Use Playwright to automate E2E scenarios and ensure every interaction works as expected.
• Continuously optimising for performance — bundle size, runtime speed, and Core Web Vitals should excite you as much as new features.

What We’Re Looking For

• 3–6 years of experience building production-grade frontend applications.
• Solid grasp of React, TypeScript, and modern frontend tooling.
• Experience working with (or curiosity about) micro-frontend setups and module federation.
• Deep understanding of bundlers (Webpack, Vite, Rollup) and how to optimise build performance.
• Hands-on experience with Storybook and design systems.
• Practical exposure to Node.js — you’re comfortable writing scripts or light backend logic.
• Strong understanding of web performance, caching, and network optimisations.
• Familiarity with Playwright or similar E2E frameworks.
• An eye for UI/UX detail — you care about interaction states, spacing, and accessibility.

Bonus Points

• You’ve led or contributed to micro-frontend migrations or large-scale design system rollouts.
• You’ve measured and improved Core Web Vitals in production.
• You enjoy experimenting with new bundler tech (e.g. esbuild, rspack, Rsbuild).
• You love finding the balance between beautiful interfaces and blazing-fast delivery.

Why You’Ll Love Working Here

• You’ll have real influence over our frontend architecture and developer experience.
• We value craftsmanship - clean code, thoughtful design, and performance all matter equally here.
• A collaborative team that enjoys solving tough problems (and sometimes bikeshedding over naming things).
• Flexible culture - focus on outcomes, not timesheets.
• Plenty of room to grow into system design, architecture, or leadership tracks.

Additional Information

• At 100ms, we place a strong emphasis on in-office presence to promote collaboration and strengthen company culture.
• Under the current policy, employees are expected to work from the office at least three days a week—Tuesday, Wednesday, and Friday—as an essential part of their role.