Frontend Engineer, Platform
Doppel · San Francisco, New York
About this role
## Why Join Doppel Doppel is built to outsmart one of the great threats AI presents: **mass-manufactured social engineering**. Scams, deepfakes, and other social engineering attacks are surging across websites, social media, ads, encrypted messaging apps, mobile, and more. Our mission is simple but bold: **make the internet a safer place by outsmarting the world’s fastest-evolving digital threats**. Backed by **a16z** and **Bessemer**, and trusted by recognized brands (e.g., **OpenAI, United Airlines, Coinbase**), Doppel is growing fast. If you’re driven to solve real-world problems with bold technology, we’d love to meet you. --- ## What We’re Looking For We’re seeking a **Senior Frontend Engineer** to elevate **UI/UX across our core product platform**. You’ll work closely with our lead designer to create a cohesive, performant, modern experience that builds confidence and trust with **enterprise customers**. Your work will directly influence **seven-figure deals** and how customers and internal teams interact with our product. --- ## What You’ll Be Doing Doppel’s Frontend Platform team is building something that hasn’t really been done: a **frontend platform so complete that product teams no longer need to do frontend development**. Designers and product engineers describe what they want; the platform—built from a **rigorously constrained design system**, **agent-driven code generation**, and **paved-road infrastructure** (permissions, telemetry, and guardrails)—turns it into production code. We’ve already proven the foundation works with our modern stack (**React 19, Relay, and a custom UI kit with agent-enforced golden paths**). Your job is to close the remaining gap between design and production. ### Key responsibilities - **Build and maintain frontend infrastructure** every product runs on: application shell, data layer, routing, auth, and build/deploy pipeline—so teams ship features, not frontend plumbing. - **Evolve the design system** from a component library into a **contract**: constrained, composable primitives with tokens, docs, and guardrails tight enough that generated code is correct by construction. - **Build the design-to-production pipeline**: tooling, agent workflows, and review guardrails that let teams go from design to shipped, production-quality UI without hand-writing frontend code. - **Make the platform safe by default**: permissioning and packaging gates, observability, accessibility, and internationalization baked into primitives rather than re-implemented per feature. - **Own production health** of the shared client: monitors, SLOs, and ownership routing so failures page the right team automatically. - **Package the platform for scale**: a versioned component library and scaffolding so new apps and surfaces spin up on the paved road from day one. - **Partner closely with design and product teams**—their velocity is your success metric. --- ## Who You Are - **5+ years** of software engineering experience with deep expertise in **React** and **TypeScript**, building and operating production web applications. - Experience owning **platform-level frontend work**: design systems, component libraries, build tooling, data-layer patterns (Relay or similar GraphQL clients), or frontend infrastructure other engineers build on. - Genuine excitement about **AI-assisted development**—you see agents as a way to raise abstraction level, and you want to build rails that make it safe. - A **platform mindset**: yo
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