Manufacturing, Engineering Services

Senior Backend Software Engineer (Python / FastAPI)

San Francisco, CAOnsiteFull TimeSenior$140,000–$240,000 /yrPosted 4 days agoVisa sponsorship available

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Required skills

Python
FastAPI
backend services
real-time sensor data
low latency
high reliability
security at scale
streaming
storage
replay

Nice to have

Geospatial
3D data visualization
TypeScript
React
Edge computing
constrained or unreliable networks

Role summary

CHAOS Industries, a defense tech company, seeks a Senior Backend Software Engineer in San Francisco to build and own real-time backend services and data pipelines. The role involves developing high-performance Python (FastAPI) services for ingesting, processing, and distributing sensor data with low latency and high reliability. Responsibilities include managing data streaming, storage, and replay, and shaping platform architecture for scalability and maintainability. The ideal candidate has strong production experience with Python, real-time data systems, and end-to-end production system ownership.

Senior Backend Software Engineer (Python / FastAPI)

San Francisco, CA (On-site) | $140k–$240k base + pre-IPO stock options

Build the real-time backend that turns radar sensor data into decisions people can act on.

CHAOS Industries is a defense tech company founded in 2022 that has raised $1B from investors including 8VC, Accel and Valor Equity Partners. You’ll own the backend services and data pipelines that move sensor data from radars in the field to the operators who depend on it.

What you’ll do

Build high-performance Python services that ingest, process and distribute real-time sensor data with low latency, high reliability and security at scale

Build high-performance Python (FastAPI) services that ingest, process and distribute real-time data securely at scale

Own streaming, storage and replay of detections, tracks and telemetry for live and playback 3D geospatial views

Build the decision layer that coordinates a growing fleet of sensors as field conditions change

Shape platform architecture for new capabilities, scale and long-term maintainability

You’re a fit if you have

Strong production experience building backend services in Python (FastAPI or similar)

Built real-time or streaming data systems: message queues, WebSockets, time-series data

Owned a production system end to end: designed it, shipped it, fixed it when it broke

Real leverage from AI coding tools, with a considered view on what to delegate and what not to

Based in, or willing to relocate to, the San Francisco Bay Area (this role is on-site)

Nice to have

Geospatial or 3D data visualization in TypeScript and React

Edge computing, or moving data reliably over constrained or unreliable networks

Azure or another major cloud platform

Hardware, sensors, robotics, telemetry or defense systems

What you get

Medical, dental and vision, 100% paid by the company

401k with 50% company match up to 6% of pay, plus FSA, HSA and life insurance

Pre-IPO stock options, relocation assistance, and annual bonuses (coming soon)

Unlimited PTO and a casual dress code

Free daily lunch while you’re working on-site, plus a fully stocked kitchen

Pay range shown is base salary only and excludes equity, bonuses and benefits. Actual offers vary based on experience, skills and business needs.

Please note: Must be a U.S. Person as defined under U.S. export control regulations, as required for access to controlled technology, and able to obtain and maintain a U.S. security clearance.

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Senior Backend Software Engineer (Python / FastAPI)

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Required skills

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