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Working Student / Intern: Offensive Security Engineer (Red Team & AppSec) (f/m/x)

Posted Oct 10, 2026

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ilert GmbH

Cologne

EnglishWerkstudentWorking student (Werkstudent)Internship

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Salary (estimate)

Full-time reference: about €53,000/year

About this job

Cologne, Germany (Hybrid)

Team: Engineering · Reports to: CTO · Format: Working Student (16–20h/week) or Internship (3–6 months)

Join our red team

ilert is a SaaS platform for alerting, on-call management and incident response that keeps digital services always on. Teams worldwide rely on us to stay up.

To keep it that way, we are building an internal red team that continuously tests our own products the way a real attacker would. And we're a genuinely interesting target: an attacker who silences ilert doesn't just steal data — they turn off the alarm while they work.

As a working student on our red team, you help us find, prove, and get security issues fixed in our own systems. You learn to think like an attacker, working closely with our team.

You don't need to arrive as a finished pentester. You need curiosity, a habit of taking things apart to understand them, and the care to handle what you find responsibly.

Tasks

Test Our Apps and APIs: Hunt for vulnerabilities in our web and mobile apps and APIs — from authentication and access control (IDOR) to injection, misconfigurations, and exposed secrets.
Re-test Past Findings: Go back over findings from previous penetration tests and verify the fixes actually hold.

Automate Security Checks in CI: Help build secret, dependency, and code scanning into our pipelines so issues surface early instead of late.

Review New Features Before They Ship: Support security reviews as features are being built, not after.

Run Authorized Social Engineering: Design and run phishing and pretexting exercises against our own team — always under a written scope signed off by the CTO beforehand, always debriefed as a learning exercise, never punitive. Then help us fix what the exercise exposed.

Poke at the AI: We're building an AI SRE that investigates incidents and can execute actions on approval. Prompt injection, tool abuse, and agent-boundary testing are wide-open ground.

Document and Follow Through: Write up findings clearly and reproducibly, then follow them through to a fix. We care as much about closing the gap as finding it.

Enrolled student , ideally in computer science, IT security, or similar.
Genuine interest in offensive security — you tinker, you break things to understand them, maybe you already play CTFs / Hack The Box / TryHackMe.
Basic grasp of how web apps and HTTP work — requests, headers, auth, cookies/tokens.
Comfortable on the command line and with at least one scripting language (Python, JS/TS, Go).
Careful and responsible with sensitive information. This role comes with access and trust: you stay inside the agreed scope and handle what you find responsibly.
Fluent English (our working language).
Able to be in our Cologne office regularly — the role is hybrid, not remote.

Burp Suite or OWASP ZAP
OWASP Top 10
AWS / Kubernetes / CI-CD exposure
Mobile app testing
LLM and agent security — prompt injection, tool-use boundaries
Your own CVEs or bug-bounty reports
German language skills

🎯 A Real Attack Surface: Not a lab, not a CTF box. Production software that companies worldwide depend on during their worst moments.
🧨 Get In Early: The red team is being built right now. You're not inheriting someone else's checklist — you help shape how we do this.
🤖 Unexplored Ground: Agentic AI security is barely a discipline yet. You'd be doing original work on it, on a product that's actually shipping.
🏡 Hybrid Freedom: Our office in Cologne Rheinauhafen (3 days/week) plus work from home (2 days/week).
🕒 Student-Centric: Flexible hours around lectures and exam periods.
🎓 Direct Mentorship: You report to the CTO and work alongside experienced engineers who want to be shown where they got it wrong.
🌴 Focus Culture: We protect maker time, favor async, and keep meetings rare.

We hire for curiosity and a builder's mentality, not a checklist. If you have a writeup, a CTF profile, a disclosed vulnerability, or a tool you built — bring it. But if you're early and hungry and can show us something you took apart, we want to hear from you too.

Keywords: Werkstudent IT-Security, Penetration Testing, Praktikum Cyber Security, Red Team, Application Security, Köln.

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Job facts

Employer: ilert GmbH
Role: Working Student / Intern: Offensive Security Engineer (Red Team & AppSec) (f/m/x)
City: Cologne
Work mode: not stated
Language: English
Seniority: Werkstudent
Posted: Oct 10, 2026
Source: Arbeitnow

Company rating

Kununu 4.9
9 reviews
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