siftstack
Senior Software Engineer, Frontend (Agentic AI)
At a Glance
- Location
- San Francisco, California, United States
- Employment
- FULL_TIME
- Experience
- 8+ years
- Compensation
- {'@type': 'MonetaryAmount', 'currency': 'USD', 'value': {'@type': 'QuantitativeValue', 'minValue': 160000, 'maxValue': 200000, 'unitText': 'YEAR'}}
- Department
- Sift Stack, Inc.
- Posted
- 2026-07-27
Key Requirements
Required Skills
Domain Knowledge
- Defense
- Energy
- Engineering
- Regulatory
Requirements
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
Compensation & Benefits
Eligibility:
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.
Responsibilities
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.
About the Company
Sift is the data infrastructure platform for hardware engineering teams. We turn high-frequency telemetry into engineering insights for mission-critical machines: rockets, satellites, autonomous vehicles, energy systems, and defense platforms. Founded by former SpaceX engineers, we are building the review and analysis layer for the AI era of physical systems.