Senior Software Engineer, Frontend
Build and own frontend for Sift Agents, AI agents that analyze hardware telemetry for engineers. Design agentic UX patterns, render large real-time datasets with high performance in the browser, and collaborate directly with customers on product direction. Requires 8+ years building complex web apps with React/TS.
About the job
Responsibilities
- Talk directly to customers and partner with product to turn real review workflows into agent capabilities: generating dashboards, writing analysis scripts, and surfacing insights buried in their telemetry.
- Build the frontend surfaces where Sift Agents live, and make them feel great.
- Design the interaction patterns of agentic UX: streaming responses, long-running tasks, interruptions, and showing an agent’s work so engineers can trust it.
- Render an agent’s findings alongside the telemetry that backs them, and keep it fast even when the data is large.
- Push the browser to its limits when the data demands it: Web Workers, OPFS-backed caching, and stepping outside React when the framework becomes the bottleneck.
- Contribute to the component library to keep agentic UI patterns consistent across the product.
- Collaborate with backend and full stack engineers on the API design that powers agent sessions.
Requirements
- 8+ years of professional software engineering experience.
- Get excited about owning a product area: talking to customers, deciding what to build, and shipping it.
- Have built complex, high-performance web applications with technologies like React, NextJS, TypeScript, or similar.
- Have an eye for detail: you notice the micro-interactions, latency, drops in FPS, and polish that separate good interfaces from exceptional ones.
- Are curious about new AI products: you try new agents, models, and features as they ship, and have opinions about what makes them good.
Nice-to-Haves
- Shipped products to users at scale: large data volumes, significant active user counts, or deep technical complexity.
- Shipped LLM-powered features.
- Built chat or agentic interfaces: streaming responses, tool-call rendering, long-running tasks.
- A strong understanding of web performance optimization and browser rendering.
- Worked with modern CSS (Tailwind) and component libraries (Radix UI) to build design systems.
- Used technical visualization tools (WebGL, D3.js, Apache ECharts), WebAssembly, and time-series data.
- Built tools for technical users (dashboards, data-editing environments).
- A personal ecosystem of AI dev tooling: custom agents, skills, scripts, or workflows built to ship faster.
- A background in scientific computing or hardware test and telemetry.
Compensation and Benefits
- Salary range: $180,000 - $230,000 per year.
- Plus equity and benefits.
Skills
React, Next.js, TypeScript, Web Workers, Opfs, Tailwind, Radix Ui, Webgl, D3.Js, Apache Echarts, Webassembly
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