---
title: 'Staff Software Engineer - Security at Flow Engineering'
canonical: 'https://feeny.ai/job/staff-software-engineer-security-flow-engineering-san-francisco-5t1zqxfxbgw1'
type: 'job'
last_seen: '2026-10-17'
---

# Staff Software Engineer - Security at Flow Engineering

- **Company:** Flow Engineering
- **Location:** San Francisco, CA
- **Compensation:** $240k–$300k
- **Employment:** full-time
- **Work type:** onsite
- **Posted:** 2026-10-09
- **Last confirmed live:** 2026-10-17
- **Apply:** https://jobs.ashbyhq.com/flowengineering/82775bfe-e3e8-495d-9799-226e04d729d7

## Job description

## About Flow

Flow Engineering is an AI-native requirements platform for modern engineering organizations, enabling hardware teams to collaborate with AI agents to design, validate, and evolve complex systems with speed and rigor.

## About the role

Our customers in defense, aerospace and more trust us with sensitive systems requirements. That means security is a first-order part of the product, so we’re looking for a Staff Software Engineer to own it. This is our first dedicated security hire, so you'll define the security architecture, harden the platform, and build out the compliance posture. Since LLMs and agentic workflows sit at the center of what we do, you'll also lead how we secure them.

## What you'll do

- Own security architecture across the platform: threat modeling, secure design reviews, and the standards we build against.
- Harden the full stack, from application security to cloud infrastructure (identity, network, secrets), tenant isolation, and data protection.
- Drive SOC 2 and get us ready for the certifications defense and aerospace customers ask about, including export control and ITAR.
- Secure our AI and agentic systems: prompt injection, data leaking through models, what actions agents are allowed to take, and guardrails.
- Build the security tooling we need across detection, monitoring, vulnerability management, and CI/CD.
- Stand up incident response and run it, from detection through postmortems.
- Work with sales and product to get through security reviews and win customer confidence.

## About you

- 8+ years building production software, including running secure services at scale in the cloud.
- Deep experience in application and cloud security (AWS, GCP, or Azure): identity and access, secrets, network security, data protection.
- You've owned security in a regulated or high-trust environment and have implemented SOC 2 yourself. Export control, ITAR, or FedRAMP experience is a big plus.
- Solid on threat modeling, secure architecture, and incident response.
- You've secured AI or LLM systems.
- You're comfortable being the security lead at a startup and setting the agenda yourself.

## Our stack (AI-leaning)

- TypeScript/Node.js and Python for AI and backend services.
- Modern LLM APIs and orchestration libraries for building agentic workflows.
- Postgres and other managed cloud services for data and state.

## How we work & values

- Speed over everything: prototype AI workflows quickly, then harden what works.​
- Own, downscope, ship, iterate: one clear owner per feature, from prototype to production.​
- Fundamentals done well: evaluation, observability, and safety are part of the first version, not an afterthought.​
- Competitive salary and meaningful equity.
- Health, dental, and vision coverage.
- Flexible time off and support for experimentation, learning, and staying current with the AI ecosystem.

## About Flow Engineering

## Company Overview
- **One-liner**: Flow Engineering provides an agentic platform for systems engineering that enables hardware teams to manage requirements, design, and testing through a living system of record and AI agents.
- **Entity Type**: Private (Series stage not explicitly stated; raised ~$40M total from Sequoia Capital and others)
- **Headquarters**: San Francisco, California, United States
- **Founded**: 2023
- **Founders**: Pari Singh (CEO)

## Core Business
- **Primary industry**: Systems engineering software / hardware development tools
- **Target customers**: B2B, Enterprise – hardware engineering teams in aerospace, automotive, robotics, defense, and energy (e.g., Rivian, Joby, Astranis, Radiant Nuclear)
- **Mission or purpose statement**: “Help unlock the next generation of hardware” – rebuild systems engineering for the agentic era, enabling teams to design, build, test, and iterate physical systems in hours, not months.

## Products & Services
- **Flow Platform**: A requirements management and systems engineering tool that links requirements, design (CAD), simulations, code, and tests in a single “living system of record”. Features include branching/merging, impact analysis agents, systems graph, flexible data model, and AI agents (e.g., Impact Analysis Agent, Safety & Regulatory Compliance Agent, Mass/Cost/Power Budget Agent). Deployable in cloud, GovCloud, or self-hosted with ITAR, export control, and data residency.
- **Flow v3**: Latest version – first agentic platform for systems engineering, allowing AI agents to perform real engineering work inside hardware development workflows.
- **Flow Engineering Handbook**: Published guide on AI Systems Engineering for the agentic era.

## Market Standing
- **Valuation/Market Cap**: Not disclosed
- **Key Metric**: Total Funding ~$40M as of most recent round (non‑equity assistance and multiple seed rounds; led by Sequoia Capital and EQT Ventures); Annual Revenue estimated at $2.0M (LinkedIn data)
- **Notable Investors/Partners**: Sequoia Capital (lead investor; partner Roelof Botha on board), Patrick and John Collison (Stripe co‑founders), David Helgason (Unity co‑founder), EQT Ventures, Google for Startups
- **Growth Signals**:
  - Used by tens of thousands of engineers across teams like Rivian (1,500+ engineers), Joby Aviation, Astranis, Radiant Nuclear, Impulse Space, Mytra, Volkswagen Group Technologies.
  - Active job postings: 10–12 open roles (as of mid‑2026), with quarterly job posting growth of +66.7%.
  - Backed by Sequoia Capital (partnered in 2025); company has grown to ~27 employees with presence in US, UK, Sweden, Spain.
  - Headcount growth recent month showed -6.9%, but same‑source LinkedIn shows heavily active hiring pipeline.

## Competitive Advantages
- **Agent‑first systems engineering**: First platform to integrate AI agents that reason across the entire engineering graph (requirements, CAD, simulation, test). Agents perform impact analysis, compliance checks, and budget tracking automatically.
- **Defense‑grade security & compliance**: ITAR/EAR aligned, NIST 800‑171, CUI, SOC 2 Type II, ISO 27001, GDPR, CCPA – essential for regulated industries.
- **Living system of record**: All engineering artifacts linked and version‑controlled with branching/merging, enabling zero‑cost change propagation.
- **High‑value customer base**: Signed marquee hardware companies (Rivian, Joby, Astranis) that are building the next generation of rockets, eVTOL, satellites, and robots.
- **Strong investor backing**: Sequoia Capital (a top‑tier VC) and technical co‑founder endorsements (Collison, Helgason) provide credibility and network.

## Strategic Focus
- **Agentic transformation**: Doubling down on AI agents that can perform real engineering work (not just assist) – moving from analog/digital to “agentic” era.
- **Scaling to enterprise & defense**: Expanding GovCloud, self‑hosted, and ITAR‑compliant deployments to win defense and compliance‑driven contracts.
- **Category creation**: Replacing traditional requirements tools (like IBM DOORS) with a modern, agent‑centric platform.
- **Global hiring**: Aggressively hiring for engineering (AI, frontend, full‑stack, infrastructure) and sales roles across San Francisco and London.

## Why Work Here
- **Impact at scale**: Work directly on tools used by companies building rockets, electric vehicles, autonomous robots – your code ships into real hardware.
- **Engineering culture**: Emphasis on shipping a V1 quickly, iterating, and maintaining “zero cost of change.” Values include speed, fundamentals done well, maximum effort/maximum fun.
- **Work environment**: Hybrid/remote policies not explicitly stated, but roles are listed in San Francisco (in‑office likely for engineering) and London. Equity offered across all roles.
- **Compensation**: Salaries range $120K–$300K for US roles with equity; London roles £80K–£180K.
- **Team culture**: Backed by Sequoia, described as a “small team with huge leverage” – ~27 employees currently but growing fast.
- **Notable perks**: Free trial demo available; engineering handbook published; company rating 4.0/5 on LinkedIn (16 reviews), with strong compensation (4.0) and culture (3.8) scores.

## Sources
1. [flowengineering.com](https://www.flowengineering.com/)
2. [flowengineering.com/careers](https://www.flowengineering.com/careers)
3. [jobs.ashbyhq.com/flowengineering](https://jobs.ashbyhq.com/flowengineering)
4. [linkedin.com/company/flowengineer](https://www.linkedin.com/company/flowengineer)
5. [sequoiacap.com/companies/flow-engineering](https://sequoiacap.com/companies/flow-engineering/)

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