Software Engineer (Frontend, Agentic AI)

Join Sift, a company focused on revolutionizing the way hardware engineers interact with their machines. As a Software Engineer (Frontend, Agentic AI), you will have real product ownership and autonomy, working directly with customers to understand their needs and building solutions from the ground up. You will be responsible for creating a seamless user experience, optimizing performance, and collaborating with backend engineers on API design. This role offers the opportunity to help evolve and scale our platform in its early stages.

• Contribuer à la conception et à la mise en œuvre de surfaces frontend où vivent les agents Sift, en veillant à ce qu'elles soient attrayantes et fonctionnelles.
• Collaborer avec les ingénieurs backend et full stack sur la conception de l'API qui alimente les sessions d'agents, en veillant à ce qu'elle soit robuste et efficace.
• Participer à l'évolution et à l'évolutivité de la plateforme, en utilisant des technologies modernes et en mettant en œuvre des optimisations de performance.
• 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
• Have built complex, high-performance web applications with technologies like React, NextJS, TypeScript, or similar
• Get excited about owning a product area: talking to customers, deciding what to build, and shipping it
• 3+ years of professional software engineering experience
• Worked with modern CSS (Tailwind) and component libraries (Radix UI) to build design systems
• Shipped LLM-powered features
• A strong understanding of web performance optimization and browser rendering
• Shipped products to users at scale: large data volumes, significant active user counts, or deep technical complexity
• U.S. Person Required: Must be a U.S. citizen, lawful permanent resident, or protected individual such as an asylee or refugee in compliance with ITAR (International Traffic in Arms Regulations) / EAR (Export Administration Regulations) regulations
• A background in scientific computing or hardware test and telemetry
• Built chat or agentic interfaces: streaming responses, tool-call rendering, long-running tasks
• 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
• Used technical visualization tools (WebGL, D3.js, Apache ECharts), WebAssembly, and time-series data