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# Senior Penetration Tester API, Web & Cloud - Contract (all genders)

- **Company:** Distribusion
- **Location:** Berlin, Germany (Remote available)
- **Experience:** Expert
- **Contract:** Permanent contract
- **Skills:** Application Programming Interfaces (APIs), Artificial Intelligence, Software System Penetration Testing, Burp Suite, Cloud Computing, Continuous Integration, Python (Programming Language), OAuth, OpenID, Open Web Application Security, PCI Data Security Standards, Web Applications, Large Language Models, Software Security, Cross-Site Scripting (XSS), Agentic-AI, Rate Limiting, Kubernetes, Webhooks
- **Published:** November 6, 2026
- **Apply:** https://startup.jobs/senior-penetration-tester-api-web-cloud-contract-all-genders-distribusion-10695558

## About the Role

Who you are:

 * You bring 5+ years of hands-on penetration testing, mainly of web applications and APIs, and can point to recent engagements you've led end to end.
 * You have deep, practical knowledge of the OWASP API Security Top 10, WSTG and ASVS, including authentication/authorization models (OAuth2/OIDC, JWT), IDOR/BOLA, mass assignment, SSRF, injection and XSS.
 * You have found business-logic and race-condition vulnerabilities in transactional systems such as booking, e-commerce, payments or fintech.
 * You are fluent with Burp Suite Pro (or similar) and write your own scripts and tooling (Python, Go or similar).
 * You are comfortable assessing cloud and container environments (GCP preferred, Kubernetes) and CI/CD pipelines.
 * You work independently: you scope, prioritise, test and report with minimal guidance, and you explain complex risks plainly to engineers and leadership.
 * You are available to start at short notice.
 * Bonus Points: OSCP, OSWE, BSCP or similar certifications; experience red-teaming LLM applications or AI agents; testing in PCI-DSS environments.

## Description

We are looking for an experienced Senior Penetration Tester to join us as soon as possible. You will run hands-on, authenticated security testing across a real attack surface: public partner-facing booking APIs, payment flows, web and mobile apps used by millions of travellers, and the cloud infrastructure behind them. You'll plan and run your own testing, work directly with our engineering squads to get findings fixed, and see your impact in production within weeks.

What you will do:

 * Test our partner-facing booking APIs against the OWASP API Security Top 10, with a focus on object- and function-level authorization, tenant isolation, mass assignment, data exposure and rate limiting.
 * Assess API authentication and integrity end to end, including OAuth 2.0/OIDC, API keys, JWTs, webhooks and request signing.
 * Hunt for business-logic abuse in booking, checkout, payment and refund flows, including race conditions and pricing manipulation.
 * Run authenticated tests of traveller-, partner- and operator-facing web and mobile apps following OWASP WSTG and ASVS, including how passenger personal data is stored, shown and exported.
 * Review cloud, Kubernetes and CI/CD configurations and secrets handling for attack paths that could be chained from an application bug.
 * Map and regularly test our internet-facing attack surface.
 * Red-team our AI features (assistants, agents, support bots) against the OWASP Top 10 for LLM Applications.
 * Write clear, reproducible, risk-rated findings with practical remediation guidance, walk engineers through fixes and verify them with retests.

Workplace:

We are a remote-first company with teams located around the Globe and a HQ in Berlin., Your Talent Partner (TP) and point of contact is Lorena Rebenciuc, and the Hiring Manager (HM) is Ilya Isakov.

For any queries, contact your Talent Partner at talent@distribusion.com.