Senior Software Engineer (Frontend, Agentic AI)

Join Sift, a company at the forefront of AI technology. As a Senior Software Engineer, you will have real product ownership and autonomy, working directly with customers to understand their needs and drive product development. You will be responsible for building the frontend surfaces where Sift Agents live, designing interaction patterns, and optimizing performance. This is a product engineering role, not a research role, and you will have the opportunity to help evolve and scale our platform.

• Contribuer à la conception et à la mise en œuvre de l'interface utilisateur pour les agents Sift, en veillant à ce qu'elle soit intuitive et réactive.
• Collaborer avec les clients et les équipes produit pour transformer les flux de travail réels de révision en capacités d'agents, en générant des tableaux de bord et en écrivant des scripts d'analyse.
• Participer à l'évolution et à l'évolutivité de la plateforme, en utilisant des technologies modernes telles que React, TypeScript, Redux, Tailwind, WebAssembly, D3.js, WebGL, et Go.
• 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
• Get excited about owning a product area: talking to customers, deciding what to build, and shipping it
• If this role excites you, apply even if you don’t check every box
• 8+ years of professional software engineering experience
• Are curious about new AI products: you try new agents, models, and features as they ship, and have opinions about what makes them good
• 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 background in scientific computing or hardware test and telemetry
• A personal ecosystem of AI dev tooling: custom agents, skills, scripts, or workflows built to ship faster
• 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