Senior Backend Software Engineer (Python / FastAPI) Software

Frontdoor Defense; San Francisco (CA); On-site; USD 140,000 - 240,000; Full time

Benefits offered by this job

Medical insurance

Dental insurance

Vision insurance

401k with match

Stock options

Relocation assistance

Unlimited PTO

Free daily lunch

Job summary

CHAOS Industries in San Francisco is seeking a Senior Backend Software Engineer (Python / FastAPI) to build the real-time backend powering radar-to-operator decisions. You will own backend services and data pipelines moving sensor data from radars in the field to operators who depend on it.

Responsibilities include high-performance Python services for real-time data, streaming, storage and replay of detections, and shaping platform architecture for future capabilities.

Qualifications

• 5+ years of backend Python experience.
• Experience building real-time or streaming data systems.
• End-to-end ownership of production systems.

Responsibilities

• Build high-performance Python services ingesting and distributing real-time sensor data.
• Develop FastAPI services with secure, scalable architecture.

Skills

Python

FastAPI

Streaming data

End-to-end ownership

SF relocation

Job description

Senior Backend Software Engineer (Python / FastAPI)

Build and own the real-time backend powering radar-to-operator decisions

Location: San Francisco, California

Compensation: $140,000 - 240,000 USD / year

About The Role

Senior Backend Software Engineer (Python / FastAPI)

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.

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.