Principal Offensive Security Engineer

Who Are We? Postman is the world’s leading API platform, used by more than 45 million+ developers and 500,000 organizations, including 98% of the Fortune 500. Postman is helping developers and professionals across the globe build the API-first world by simplifying each step of the API lifecycle and streamlining collaboration—enabling users to create better APIs, faster. The company is headquartered in San Francisco and has offices in Boston, New York, Austin, Tokyo, London, and Bangalore - where Postman was founded. Postman is privately held, with funding from Battery Ventures, BOND, Coatue, CRV, Insight Partners, and Nexus Venture Partners. Learn more at postman.com or connect with Postman on X via @getpostman. P.S: We highly recommend reading the "API-First World" graphic novel to understand the bigger picture and our vision at Postman.

About the Team

The Information Security organization at Postman operates across three pillars: Governance Risk & Compliance (GRC), Product Security, and Security Operations. We are a team of builders, not checkbox-checkers. We hold active SOC 2 Type II, ISO 27001, ISO 42001, and HIPAA compliance postures, and we are pursuing FedRAMP High and CMMC Level 2 authorization. Our security stack includes Wiz, SentinelOne, Okta, Jamf, and 1Password, and we operate across a multi‑cloud environment. The Offensive Security team is the "red" pulse of this organization. We don't just find bugs — we simulate the adversary to ensure our defenses hold up under real‑world pressure. We focus on continuous security validation, AI‑augmented adversary emulation, and offensive AI security research at Postman’s scale.

Opportunity

We are looking for a Principal Offensive Security Engineer who is as much a strategist as they are a hacker. You will own the strategic direction of Postman’s offensive security program — including building out a dedicated Offensive AI Security capability from the ground up — and operate as a key partner to CISO leadership on threat‑informed defense strategy. This is not a role where you inherit a mature program and keep the lights on. You will shape what offensive security looks like at Postman for the next three years, with a specific mandate to make us an industry leader in adversarial testing of AI systems, agentic workflows, and LLM integrations. You will lead a team that doesn't just "report" vulnerabilities but "demonstrates" them, using live exploits to build a deep, visceral security culture across the entire engineering organization.

What You’ll Do

Strategy & Program Ownership

Set Strategic Direction: Define and execute the multi‑year offensive security roadmap, aligning Red Team, Purple Team, and continuous validation capabilities to Postman’s evolving threat landscape and business priorities.

Build the Offensive AI Security Practice: Stand up and scale a dedicated offensive capability targeting AI/ML systems. This includes adversarial testing of LLM integrations, agentic workflows (MCP, tool‑use chains), RAG pipelines, and model‑serving infrastructure. You will define the methodology, tooling, and engagement frameworks from the ground up.

Develop AI Threat Intelligence: Track and operationalize the rapidly evolving AI threat landscape — OWASP LLM Top 10, MITRE ATLAS, emerging attack research on agentic systems — translating external research into internal red team playbooks and detection hypotheses for Security Operations.

Hands‑On Technical Leadership

Red Team AI Systems at Depth: Go beyond checkbox assessments. Lead structured adversarial campaigns against Postman’s LLM deployments, AI agents, and model pipelines — targeting prompt injection, tool‑use abuse, data exfiltration via context manipulation, training data poisoning, model manipulation, and trust boundary violations in multi‑agent architectures.

Architect Autonomous Testing: Design and deploy AI‑based penetration testing platforms and autonomous agents to perform continuous security validation across our API ecosystem.

Continuous Validation: Move from manual pentesting to Continuous Offensive Security, integrating automated breach and attack simulation (BAS) into CI/CD pipelines, including AI model deployment pipelines.

People Leadership

Lead & Cultivate: Build, manage, and scale a high‑performing team of offensive security engineers — including specialized AI red team operators — providing mentorship, career development, and succession planning.

Recruit for the Future: Identify and hire talent at the intersection of offensive security and AI/ML — a rare and competitive talent market. Build a pipeline that includes internal development paths for existing security engineers to cross‑skill into AI red teaming.

Communication & Influence

Drive Security Culture through "The Show": Lead live "Exploitable Demonstrations" — technical proof‑of‑concepts presented to engineering teams that show exactly how a vulnerability could be leveraged, turning abstract risks into tangible learning moments. Place particular emphasis on demystifying AI‑specific attack vectors for non‑ML engineers.

Executive Communication: Translate offensive findings into business‑level risk narratives for executive leadership, the board, and external stakeholders. Partner with GRC on audit evidence and compliance posture derived from offensive operations, including AI‑specific risk frameworks (ISO 42001).

Cross‑Functional Partnership: Operate as a senior technical leader across Product Security, Security Operations, and Engineering, ensuring offensive findings — especially from AI red team engagements — drive measurable improvements in detection, response, and architecture.

About You

Experience: Minimum of 8 years in offensive security (penetration testing, red teaming, vulnerability research, or exploit development) with at least 4 years in a people management or leadership capacity, including experience managing managers or tech leads.

AI/ML Offensive Depth: Demonstrated experience attacking AI/ML systems — whether through adversarial ML research, LLM red teaming, agentic system exploitation, or building offensive tooling for AI targets. You understand the difference between prompt injection and indirect prompt injection, know what a tool‑use confusion attack looks like, and can articulate why RAG poisoning is a supply chain problem.

Strategic Acumen: Demonstrated ability to build and scale an offensive security program from the ground up or significantly mature an existing one. Experience setting OKRs, managing budgets, and presenting to executive leadership.

Adversarial Mindset: Deep understanding of the modern threat landscape and how to apply it to cloud‑native, API‑first environments — extended to AI‑native architectures.

AI Offensive Tooling Fluency: Hands‑on experience with AI‑augmented pentesting tools (e.g., PentestGPT, Horizon3, custom LLM‑based fuzzing) and purpose‑built AI red team frameworks (e.g., Microsoft PyRIT, Garak, custom harnesses). Understanding of how to manage non‑deterministic AI outputs in both offensive tooling and target systems.

Pragmatic Storytelling: You believe that a well‑executed exploit demo is more effective than a 50‑page PDF. You can present a complex exploit chain — including an AI‑specific attack path — to a room of developers in a way that is inspiring, not condescending.

Engineering Fluency: You prefer building an automated "exploit‑as‑code" validator over performing the same manual test twice. You can architect evaluation harnesses and adversarial test suites for ML models.

Preferred Industry Presence: Track record of contributions to the offensive security or AI security community — conference talks (DEF CON, Black Hat, BSides, RSA), tool releases, published research, CVEs, or active participation in OWASP, MITRE, or similar working groups.

Certifications: OSCP, OSCE, OSEP, GXPN, GPEN, CRTP, or equivalent hands‑on offensive certifications. AI/ML‑specific credentials (e.g., GIAC GMAI) are a differentiator.

Cloud Security Expertise: Deep familiarity with AWS security primitives, cloud‑native attack paths, and container/Kubernetes exploitation.

API Security Depth: Experience with API‑specific attack methodologies — BOLA, BFLA, mass assignment, GraphQL abuse, gRPC exploitation — reflecting Postman’s core product domain.

Compliance Awareness: Familiarity with how offensive security outputs map to SOC 2 Type II, ISO 27001, ISO 42001, FedRAMP, or CMMC control evidence. You don’t run GRC, but you know how to feed it.

What Else?

In addition to Postman’s pay‑on‑performance philosophy, and a flexible schedule working with a fun, collaborative team, Postman offers a comprehensive set of benefits, including full medical coverage, flexible PTO, wellness reimbursement, and a monthly lunch stipend. Along with that, our wellness programs will help you stay in the best of your physical and mental health. Our frequent and fascinating team‑building events will keep you connected, while our donation‑matching program can support the causes you care about. We’re building a long‑term company with an inclusive culture where everyone can be the best version of themselves. At Postman we value in‑person collaboration. We are in office 5 days a week for all roles based out of our hubs in San Francisco Bay Area, Boston, Austin, New York City, Tokyo and London. For roles based in Bangalore, employees currently work in the office three days a week and will transition to five days per week by the end of the year. We were thoughtful in our approach which is based on collaboration and grounded in feedback from our workforce, leadership team, and peers. The benefits of our in‑office model will be shared knowledge, brainstorming sessions, communication, and building trust in‑person that cannot be replicated via zoom.

Our Values

At Postman, we create with the same curiosity that we see in our users. We value transparency and honest communication about not only successes, but also failures. In our work, we focus on specific goals that add up to a larger vision. Our inclusive work culture ensures that everyone is valued equally as important pieces of our final product. We are dedicated to delivering the best products we can.

Equal Opportunity

Postman is an Equal Employment Opportunity and Affi... Qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender perception or identity, national origin, age, marital status, protected veteran status, or disability status. Headhunters and recruitment agencies may not submit resumes/CVs through this website or directly to managers. Postman does not accept unsolicited headhunter and agency resumes. Postman will not pay fees to any third‑party agency or company that does not have a signed agreement with Postman.

Postman powers API development for 40 million+ developers and 500,000+ organizations worldwide. Join us and help define how the world connects.

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