Freelancer profile translated to English.
Back to original languageAbout Guido
Security, for me, comes from a deep understanding of a system. Security research at CISPA has shaped me; today, I build secure distributed systems on Kubernetes with an eight-person team.
As a freelancer, I offer this depth in threat modeling, security architecture, and code reviews. If desired, hands-on implementation is also available.
German
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- Puls Security GmbHTech LeadApril 2025 - Today (1 year and 4 months)Technical and functional leadership of an 8-person R&D team for a security-critical distributed system in a regulated environment: from exploratory architecture work and proof of concepts to the production environment. Also responsible for setting up and operating the underlying Kubernetes platform.Activities:
- Conception and setup of a Kubernetes platform from scratch, including CI/CD, observability, and security tooling for application development and operation
- Development of distributed services in Go in proof-of-concept and production environments
- Architectural decisions, tech stack selection, and implementation of security architectures
- Analysis, optimization, and further development of complex legacy systems
- Code quality, test strategy, and technical mentoring of the team
- CISPA - Helmholtz Center for Information SecurityStaff ResearcherRESEARCHJanuary 2021 - October 2022 (1 year and 9 months)Research at CISPA Helmholtz Center for Information Security with a focus on formal methods for offensive security: development of models and tools for systematically analyzing attacker behavior and defense strategies.Activities:
- Modeling of penetration tests as Stackelberg planning problems: collection of network topology through white-box and black-box scans, conversion into a formal attack model, and calculation of optimal attack paths under realistic defender assumptions
- Development of a formal, generalizable model for privilege escalation in Kubernetes
- Research on optimizing resource allocation against DDoS attacks; an optimization-based approach with game-theoretic elements.
- Michael Backes Cybersecurity GmbH & Co. KGSoftware DeveloperJune 2019 - May 2020 (11 months)
- Internal security research for hardening internal infrastructure and ensuring compliance requirements
- Development of an SIEM product for Active Directory based on machine learning-based anomaly detection
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Education
- MasterSaarland University2020Master of Science Informatik (Note: 1,2) Abschlussarbeit: "Playing CATSS and MAUS: A Theory of Privilege Escalations and Applications to Simulated Pentesting"
- BachelorSaarland University2019Bachelor of Science Informatik Abschlussarbeit: "Data acquisition for simulated pentesting and mitigation analysis using OVAL""