Senior AI‑Driven AppSec Engineer

Sierra Ventures; Miami (FL); Hybrid; USD 140,000 - 200,000; Full time

Benefits offered by this job

Competitive starting pay

Discretionary annual bonus

Long-term equity incentive grants

Comprehensive health plans

401K with company matching

Paid parental leave

Flexible time off

Job summary

Gemini is seeking a Senior Application Security Engineer to partner with engineering, product and business teams to embed security judgment into product design and delivery. You will lead secure design reviews, threat modeling, code reviews and penetration testing for high‑risk products such as crypto custody, trading systems and payments.

You will build AppSec tooling, including AI agents for secure design and code review, and will drive secure coding practices across cross‑functional teams,

Qualifications

• 5+ years of experience in application security or similar roles.
• Ability to perform design reviews, threat modeling, secure code reviews, or penetration testing with an attacker mindset.
• Experience building or meaningfully contributing to security tooling and automation.
• Strong background in application security best practices and familiarity with common vulnerabilities (e.g. SSRF, race conditions, privilege escalations).
• Some background in development or scripting experience (Python, Scala, C++, or JavaScript) with the ability to read and write code.
• Strong communication skills to influence without authority and the ability to collaborate on a cross‑functional team with competing priorities.

Responsibilities

• Lead secure design reviews, threat modeling, code review, and penetration testing for high‑risk products such as crypto custody, trading systems, and payments
• Build and ship code: design and build AppSec tooling including AI agents for secure design and code review, AI‑enhanced SAST/DAST pipelines, and automation that eliminates repeatable security toil
• Partner with engineering teams to remediate vulnerabilities and drive long‑term improvements in secure coding practices

Skills

5+ years in App Security

Threat modeling & design reviews

Security tooling & automation

Secure coding practices & vulns

Scripting languages (Python/Scala/C/C+

Job description

Gemini is seeking a Senior Application Security Engineer to partner with engineering, product and business teams to embed security judgment into product design and delivery. You will lead secure design reviews, threat modeling, code reviews and penetration testing for high‑risk products such as crypto custody, trading systems and payments.

You will build AppSec tooling, including AI agents for secure design and code review, and will drive secure coding practices across cross‑functional teams,