Staff Security Engineer, Application Security

About fomo

fomo is a trading app for the rest of us. Sign up in seconds and start trading right away, with no prior experience needed. Our social features are actually useful: follow top traders, see their full portfolios and trades, and find opportunities early. Under the hood, we deliver best-in-class execution and data for experienced traders.

In just over a year, fomo has onboarded over 3 million plus users who have collectively done over $14 billion dollars in trading volume.

fomo has made ~$100M of revenue since launching in May 2025, and has raised a total of ~$100M in addition from T1 investors. Investors include Benchmark, Index Ventures, and Union Square Ventures.

https://fomo.family/

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Want to learn more about the team, our growth, and life at fomo? Check out our Work at fomo page.

About the role

We're hiring a Staff Security Engineer to own and elevate our application security program. This is a hands-on, high-leverage role for someone who wants to be the technical authority on how we build secure software, not just someone who reviews tickets after the fact. You'll work directly with the engineering team to find and fix vulnerabilities, build tooling that scales security across the org, and shape how fomo thinks about security at the architecture and code level.

This role skews heavily toward product and application security. You won't be spending your time on corporate IT, endpoint management, or employee-facing security operations. Instead, you'll be embedded in how our product is designed, built, and shipped.

What you'll do

Lead security architecture reviews and threat modeling for new features and major system changes, partnering directly with engineering and product teams from design through launch

Own our secure SDLC program: static and dynamic analysis (SAST/DAST), dependency and software composition analysis, secrets scanning, and CI/CD security gates

Perform deep-dive code reviews and manual penetration testing of high-risk services, APIs, and web applications

Design and build internal security tooling and guardrails that let engineers move fast without introducing risk

Run and mature our vulnerability management program, including triage, severity scoring, and driving remediation with engineering owners

Manage relationships with external pentest vendors and bug bounty programs, and turn findings into durable fixes rather than one-off patches

Set technical direction on authentication, authorization, API security, and data protection patterns used across the product

Mentor engineers on secure coding practices and act as a go-to resource for security questions across the org

Contribute to incident response when application-layer issues arise

Help define and evolve fomo's overall AppSec roadmap and metrics

What we're looking for

7+ years in security engineering, with a substantial and recent focus on application security (not primarily corporate/IT security)

Deep hands-on experience with secure code review, threat modeling, and common vulnerability classes (OWASP Top 10, auth/session flaws, SSRF, injection, business logic flaws, etc.)

Strong software engineering background; comfortable reading and writing production code, not just running scanners

Experience building and scaling AppSec tooling and processes (SAST/DAST, SCA, CI/CD security integration) at a growing company

Track record of driving security into engineering culture through influence, not just gatekeeping

Familiarity with cloud-native environments (AWS/GCP/Azure), container security, and modern API architectures

Excellent communication skills; able to explain risk to both engineers and non-technical stakeholders

Prior experience as a technical lead or staff-level IC who can operate with high autonomy

Nice to Have

Experience with bug bounty program management

Background in a high-growth consumer or marketplace product

Why fomo

You'll be the first dedicated AppSec hire shaping the security foundation of a company at real scale, with the autonomy to set standards rather than inherit them.

Compensation and benefits

fomo offers

Competitive cash compensation and equity

Comprehensive health insurance including medical, dental, and vision for you and your dependents; including tax savings benefits such as HSAs and FSAs

401(k) with match

Group term life insurance

Flexible time off

Annual company offsites

Equal opportunity

fomo is an equal opportunity employer. We consider qualified applicants without regard to race, color, religion, sex, sexual orientation, gender identity or expression, national origin, age, disability, veteran status, or any other characteristic protected by applicable law. If you need a reasonable accommodation during the hiring process, please let us know.