Frontend Software Engineer, Sift

• 3+ 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
• If this role excites you, apply even if you don’t check every box

Desirable

• Hardware programs generate far more telemetry than any team can review by hand
• Sift Agents is our answer: AI agents that work alongside hardware engineers, investigating anomalies, reviewing test and flight data, and answering in minutes questions that used to take a day of scripting
• This role comes with real product ownership and autonomy
• You will talk directly to customers to understand how they review their machines, decide what to build, and own it from first MVP through every iteration after it ships
• The surface area is wide: one day you might be polishing the micro-interactions that make the chat experience feel great, the next you might be building a bespoke caching layer for the chat messages off the main JS thread
• We’re heavy users of frontier agentic products ourselves and have strong opinions about what makes them great
• Sift Agents is where we put those opinions to work
• This is a product engineering role, not a research role
• Most of the work is the hard part of making agents feel dependable in the browser: streaming interactions, long-running tasks, rendering agent output over large real-time datasets, and showing engineers exactly what an agent did and why
• 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