About Sebastian
Enterprise Software | Test Strategy | Post-Quantum Readiness | Complex Systems Validation
Consultant specializing in enterprise software validation, QA process stabilization, and secure system architectures.
Background in telecom-scale environments including projects within Deutsche Telekom and founder of a deep-tech startup focused on post-quantum security architectures.
I support organizations in stabilizing releases, structuring QA operations, and preparing mission-critical systems for future cryptographic challenges.
German
Native or bilingual
English
Fluent
Can work on-site
Düsseldorf (up to 50km)
Experience
- AI SLEIPNIR GmbHFounder & Technical LeadDEFENSE AND MILITARYJanuary 2025 - Today (1 year and 5 months)Designed quantum-resilient architecture concepts, structured QA governance frameworks, validated enterprise systems and AI-driven workflows.
- Deutsche TelekomQA EngineerDEFENSE AND MILITARYJanuary 2022 - January 2025 (3 years)Designed and executed manual & automated test cases for enterprise telecom systems. Improved release stability, supported CI/CD pipelines, and reduced production defects.
Recommendations
Be the first to recommend Sebastian
Help this freelancer shine by sharing your experience working together.
These freelancer profiles also match your criteria
Agatha Frydrych
Backend Java Software Engineer
4.7
(3)
2
Baptiste Duhen
Fullstack developer
4.6
(4)
5
Amed Hamou
Senior Lead Developer
4
(2)
7
Audrey Champion
Web developer
4.3
(3)
4