Staff engineer leading architecture and development of scalable web services for Thunderbird’s privacy - focused email ecosystem. Shaping products, analytics, technical direction, and engineering practices.
About the role
- Senior Front End Engineer building React applications and streamed AI-generated experiences for Knotch’s content performance marketing platform. Developing multi-tenant interfaces, embeds, and data visualizations.
Responsibilities
- Build features across both Knotch ACE and Knotch One applications
- Develop the component system that renders streamed, AI-generated layouts, including schemas, renderers, and contracts
- Work on multi-tenant theming, design tokens, per-brand configuration, and client-specific variants
- Build and maintain embeds that run the product inside customer websites
- Set standards for testing, accessibility, and performance
- Work with backend engineers on API and streaming contracts
- Write technical approaches before building and raise blockers, risks, and disagreements early
- Ramp up on unfamiliar parts of the product and codebase
- Mentor others through code review, pairing, and written design
- Own features end to end and collaborate directly with backend, data, and product teams
Requirements
- 6+ years building React applications in production
- TypeScript day to day, including typing data that arrives at runtime
- Next.js App Router, or another framework with a server/client rendering split — Remix, Nuxt, SvelteKit
- Experience in a large codebase with history, fitting into earlier decisions rather than starting clean
- CSS at scale — utility-first (Tailwind) or CSS-in-JS (styled-components, Emotion)
- Styling systems built on tokens or theme objects
- Accessible UI work — keyboard navigation, ARIA, and testing against WCAG
- Data visualization — ECharts, D3, Recharts or similar
- Writing tests alongside features — Vitest, Jest, Testing Library or similar
- Clear written communication and ability to work without close supervision
- Ability to scope own work, unblock oneself, and communicate needs
- Nice to have: Runtime schema validation — Zod, Valibot or similar
- Nice to have: Streaming or incremental UI — SSE, WebSockets
- Nice to have: Monorepo tooling — pnpm workspaces, Turborepo, Nx
- Nice to have: Design tokens and multi-tenant theming
- Nice to have: Embedding JavaScript into third-party sites — iframes, CSP, sandboxing
- Nice to have: Client state management at scale (Redux, Zustand or similar) against a typed API layer, GraphQL or REST
- Nice to have: Using AI-assisted tooling to move faster, and a view on where it helps and where it doesn't
Benefits
- Comprehensive health benefits through the employer of record (EOR) relationship with Globalization Partners
- Unlimited PTO
- Paid Holidays
- Wellness Perks
- Daily Company Break
- Phone Plan Credit (select team members who have high phone usage for work)
- Company Offsite
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Staff software engineer shaping scalable web services for Thunderbird, an open - source privacy - focused email and productivity platform. Leading architecture, prototypes, analytics, and technical direction.
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