Senior Software Engineer, Security

Job not on LinkedIn

🔥 0 minutes ago

🇺🇸 United States – Remote

💵 $170k - $230k / year

⏰ Full Time

🟠 Senior

👮‍♂️ Cybersecurity / Security Engineer

🦅 H1B Visa Sponsor

This company has sponsored H1B visas in the past.

👻 Ghost score 21%

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Flex

WebsiteLinkedInAll Job Openings

11 - 50 employees

💳 Fintech

🤝 B2B

💰 $100M Debt Financing on 2023-09

Fintech • B2B

Flex is an end-to-end finance platform designed for businesses, facilitating various financial operations and enhancing financial management. With a focus on providing comprehensive financial solutions, Flex aims to streamline processes and improve efficiency for its users in the commercial sector.

📋 Description

• Report directly to the CTO and set Flex’s security standard • Threat model money movement paths including the ledger and write path, card issuing, payouts, and stablecoin systems • Participate in design reviews for anything that touches money and continuously assess existing systems • Build secure-by-default infrastructure, including IaC guardrails, CI/CD supply-chain integrity, secrets handling, service isolation, and workload IAM • Build a just-in-time, least-privilege cloud access system • Own application security across new and existing systems • Build automated checks and secure defaults into the development lifecycle • Perform high-risk code reviews, dependency and SBOM hygiene, and effective static and dynamic analysis • Eliminate vulnerability classes through automation • Build tooling and golden paths that keep sensitive data out of logs • Run the vulnerability disclosure program end to end and grow it into a bug bounty program • Scope and manage external penetration tests and drive remediation • Build security automation, including AI-assisted triage and review • Partner with Engineering, IT and Corporate Engineering, Risk, and Compliance on security reviews and audits

🎯 Requirements

• Strong software engineer with security expertise; comfortable in the normal engineering interview loop • Substantial hands-on experience building or securing systems in a fast-moving environment, including a period as the most senior person doing this work • Real software engineering ability in Python, Go, TypeScript, or similar; not scripting alone • Hands-on AWS or GCP cloud infrastructure experience • Hands-on Terraform or equivalent Infrastructure as Code experience • Experience with containers and CI/CD pipelines that you have changed, not only used • Practical threat modeling on systems with real consequences • Experience with secrets management, workload identity, and service-to-service authorization • Experience handling inbound vulnerability reports, including at least one difficult reporter • Clear written communication and a bias toward writing things down • Experience shipping a security tool or control that engineers adopted • Ability to make risk-based security decisions and identify trust boundaries • Strongly preferred: platform, infrastructure, or DevOps background moved toward security • Strongly preferred: small-company or founder experience • Strongly preferred: experience running a VDP or bug bounty program, including triage • Strongly preferred: fintech, payments, or regulated-environment experience • Strongly preferred: production experience applying AI or LLM tooling to security work • OSCP or OSWE certifications are welcomed but do not substitute for an engineering track record

🏖️ Benefits

• Meaningful equity if you help build something big • Founder-level exposure with direct access to leadership, customers, and investors • Small teams, high trust, and real accountability • Professional opportunity to work on AI, underwriting, compliance, payments, credit, and banking at scale