About Flexport

At Flexport, we believe global trade can move the human race forward. That’s why it’s our mission to make global commerce so easy there will be more of it. We’re shaping the future of a $10T industry with solutions powered by innovative technology and exceptional people. Today, companies of all sizes—from emerging brands to Fortune 500s—use Flexport technology to move more than $19B of merchandise across 112 countries a year.

The recent global supply chain crisis has put Flexport center stage as we continue to play a pivotal role in how goods move around the world. We are proud to have the support of the best investors in the game who believe in our mission, solutions and people. Ready to tackle global challenges that impact business, society, and the environment? Come join us.

What You'll Do

Architecture & strategy
Define security architecture for Flexport's products and services, and set the patterns and reference implementations that make secure-by-default the path of least resistance.
Lead security engineering reviews for the highest-risk product features, and set the bar for what "good" looks like in reviews you don't personally run.
Build and scale the security champions program and product security training that extend your judgment into teams where you can't be in every review.
Design-time & review
Lead domain-specific threat modeling and attack surface analysis across Flexport's product surface, not just individual features.
Partner with engineering leadership to resolve the design tradeoffs that a senior engineer would escalate.
Vulnerability management
Set the bar for how the team triages, reproduces, and prioritizes bug bounty submissions and internal security reports, and step in on the hardest or highest-severity cases.
Drive remediation of systemic classes of vulnerability, not just individual findings.
Developer enablement & leadership
Own the security services and tooling consumed by product teams across our global infrastructure.
Mentor other engineers on the team, and act as the authoritative technical voice on product security across engineering leadership.

You Should Have

Typically 8+ years of experience in product/application security, with real hands-on time building security tools and services, not just reviewing them — we care more about what you've built than the exact number.
A track record of designing security architecture that scales across many teams and services, not just securing a single product.
Strong grasp of web application security principles and hands-on experience with application testing tools (Burp Suite, OWASP ZAP, or similar)
Software development experience building security tools in at least one modern language (Go, Python, Java/Kotlin, TypeScript, Ruby, or similar)
Track record of leading multi-team technical initiatives and mentoring engineers into senior roles

Nice to Have

Experience running or scaling a security champions program
Identity management and identity federation experience (SAML, OAuth, SCIM)
Experience with IaaS cloud infrastructure, Kubernetes, containers, and service-oriented architectures
Hands-on experience with bug bounty platforms and SAST tools (Cycode, Semgrep, Snyk, or similar)
Experience performing code audits on internal or open-source libraries before they ship in production

How We Work

We're in the San Francisco office regularly to whiteboard and ship together
We stay closely aligned with teammates on other continents via Slack, video, and async docs
We have the latest hardware and software, including frontier AI models on day one
We're agile, but not dogmatic — the team decides how it works best

Why This Role Is Special

Massive leverage: the conventions and champions program you build are multiplied across hundreds of engineers who never talk to you directly.
Broad authority: you set the architecture other reviews are measured against, rather than being the one measured.
You're part of PSI: the platform, security, and infrastructure teams work hand in hand, and security is treated as infrastructure with real engineering quality bars, not a policy function.