Penetration Testing Experts in Berlin

• Developed a custom tool using the Mistral 7B LLM to scan, validate, and report security vulnerabilities.
• Security tested AI agents, bots, and other LLMs, focusing on prompt injection, model inversion, data poisoning, EDR/AV bypass and evasion techniques, membership inference, model evasion, overfitting to malicious inputs, and contextual manipulation.
• Onboarded repositories to SAST solutions for security scanning, implemented secrets scanning, DAST, and SCA, and used ZAP for DAST in CI/CD pipelines.
• Delivered security awareness training and developed CTF challenges and training materials to improve developers' security knowledge.
• Planned and carried out bi-annual red teaming operations based on the MITRE ATT&CK framework and led internal and external pentests based on the OWASP Top 10 framework for 70+ applications worldwide, resulting in the detection, reporting, and remediation of hundreds of vulnerabilities.
• Triaged HackerOne reports.

• Conducting cybersecurity readiness checks based on an in-house assessment methodology
• Analyzing the external attack surface using the Graydaxe EASM platform
• Assessing maturity levels and deriving prioritized recommendations for action

• Responsibilities:
• Collaborate with Product Owner to define functional and technical requirements
• Quarterly Roadmap definition with Executives and Product Owner
• Fix bug and develop new features in Go and Typescript
• Manage and mentor full stack engineering team
• System Design in a micro-service environment
• Guarantee application security
• Improve engineering efficiency and deliverable quality
• Support automation with agentic-AI workflow
• Achievements:
• Improved security and data privacy awareness in the team with workshops around best practices, security measures and attacks types
• Conceptualized, designed and successfully released a new real-time chat application for our partners improving partner/company relationship and collaboration efficiency in Go and Typescript
• Reduced meeting hours for engineers by restructuring projects preparation workflow in collaboration with product team

At gematik's Cyber Defense Center (CDC/CERT) (critical infrastructure): Security Monitoring, Incident Response, and Service Monitoring for the telematics infrastructure (TI)

• Vulnerability management with Nexpose for gematik and the telematics infrastructure
• Vulnerability Assessment: Assessing and tracking vulnerabilities through Jira
• Security Monitoring and triage of security events with Splunk
• First Responder and Incident Handling: Initial assessment, triage, and escalation
• Service Monitoring: Monitoring critical TI services
• Documenting runbooks, playbooks, and knowledge base articles in Confluence

• Projects for federal networks (NdB).
• CR management, EoL change requests, design and documentation according to ITSCM.
• Data center planning.
• Project management and engineering subproject management.
• Software development for virtual server environments according to BSI.

• Defined and executed a comprehensive security roadmap: integrated Shift-Left Security, CNAPP, and DevSecOps principles to streamline secure product development and reduce risk exposure.
• Established a robust threat modeling framework: embedded security into design processes, enabling early identification of vulnerabilities and reducing potential risks.
• Developed a scalable Vulnerability Management program: accelerated detection and remediation of new vulnerabilities, significantly shortening the risk response cycle.
• Enhanced cloud and container security: leveraged advanced tools such as Tetragon to achieve deeper visibility and implement a defense-in-depth strategy.
• Automated security controls within CI/CD pipelines: integrated security measures into the development lifecycle to maintain continuous delivery with robust safeguards.
• Championed cross-functional collaboration: partnered with developers and infrastructure teams to prioritize threats and align remediation efforts, fostering a unified security culture.
• Ensured regulatory compliance and audit readiness: collaborated closely with the InfoSec team to adhere to internal policies and successfully support audits for standards like PCI-DSS and SOC2.

I worked on automating cold outreach.

• Developed a queue architecture to support the parallel execution of large volumes of background tasks.
• Integrated multiple email delivery providers.
• Implemented an LLM-based data enrichment process.

Technologies: TypeScript, React, Node.js, Next.js, Drizzle ORM, PostgreSQL, Next-Auth, JWT, Docker, Kubernetes, AWS, CloudFlare, Traefik, Groq, Jest, Figma

• ISMS and security concept for the Fabasoft e-file according to BSI 200-1/2, among others
• Structural analysis (A.1), modeling (A.3), and baseline protection checks (A.4)
• Preparation for OWASP penetration test, incident response plan, risk analysis
• DevOps Bitbucket, ARC42, IAM with Keycloak/AD, multi-tenant setup, DMS, SOC
• Emergency preparedness concept (BSI 200-4), operations and service concept (BSK), ITSM

• Developed Red Team infrastructure for real-world attack simulations using Sliver C2 and custom tools
• Executed advanced Red Team operations, integrating AI/LLM security research for prompt injection attacks
• Conducted comprehensive breach assessment attacks and vulnerability assessments across enterprise infrastructure
• Performed root cause analysis and purple team exercises, generating executive-level reports
• Lead LLM red teaming initiatives to improve AI model security for GPT-4, Mistral, and internal GenAI models

• Operational management of the company: building teams and infrastructure, developing products, analysis and implementation of IT security measures

• Project assignments in the IT security environment focusing on establishing blue teaming activities (defensive processes and technologies) to defend against cyber attacks

• Conducting red teaming processes, including penetration tests and security analyses for companies

• Consulting on setting up Security Operation Centers and implementing SIEM systems, and building Computer Incident Response Teams (CSIRT)

• Auditor for ISO 9001 and ISO 27001, § 8a, ISO 27019, § 11 1a EnWG, TISAX

• Advising companies in critical infrastructures on information security and compliance with the IT Security Act

• Building SIEM/SOC processes and SOC analyst work (Splunk, ELK-Stack)

• Integrating data into monitoring tools (Prometheus, Grafana)

• Consulting on BSI IT baseline protection, ISO 9001, ISO 27001, BCM, ITIL and risk management

• Security assessments and penetration testing of IT and network architectures

Led a team of 3 and drove up business development figures, candidates sourced into the pipeline and lowered the average time-to-fill for vacancies. Managed the entire technical recruitment process from sourcing through to post-probation reviews, also increasing both candidate and client satisfaction.

Sourced technical candidates for many specialised technical roles within companies spread across Europe, including data experts, developers, DevOps, IT system administrators and sales engineers.

Pre-screened sourced candidates for both technical and cultural fit, reducing the time spent by hiring managers weeding out candidates with poor fit.

Interviewed candidates in order to determine their levels of role-specific knowledge, and their potential fit within client businesses.

Provided coaching and interview preparation for candidates.

Carried out reviews with candidates after placement to ensure that both clients and candidates were happy and that candidates remained within their new roles.

Worked with a number of ATS systems based on client resources and needs, including Personio, Lever and Team Tailor.

Constructed a CRM/ATS system for VITA using the open-source Odoo software delivering significant savings in time and efficiency.

• Led telecom security testing team & SOC deployments across Tier-1 carriers; reduced critical vulnerabilities by 30%.
• Conducted 5G/O-RAN fuzzing, penetration testing, and vulnerability research (basebands, RAN, core).
• Designed testbeds for protocol fuzzing (AFL++, LibAFL) on 5G stacks.
• delivered client workshops on secure telecom with AI assisted workflows.
• Researched AI-driven SOC and penetration testing (LLMs for log triage, anomaly detection, adversarial monitoring).

• Preparing an oil company for KRITIS auditing
• KRITIS consulting
• Creating necessary policies, processes, and guidelines in line with KRITIS requirements
• Tools and methodologies used: ISO/IEC 27001, BSI IT Baseline Protection, KRITIS-V

• Served as IT project manager and Scrum Master
• Consulted on IT security