Felix Schlösser

Software Architect & Security Engineer

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M.Sc. Secure Software at KU Leuven with prior experience as Deputy CISO in the public sector. Expertise in GDPR and ISMS compliance, privacy by design, and secure digital transformation of government services. Combines architecture and DevOps skills with strong stakeholder communication to deliver compliant and trustworthy systems.

Experience

Sozialbehörde Hamburg (Amt Z)
2023 – 2025

Software Architecture Consultant and deputy CISO

Requirements-Engineering BDD Low-Code BSI-Grundschutz BPMN
  • Transformed tender documents into testable specifications, shortening procurement cycles and securing quality outcomes.
  • Ensured GDPR and BSI-Grundschutz compliance through threat modeling, DPIAs, and coordination of external audits and pen-tests.
  • Introduced architectural standards and semantically interoperable APIs to promote modular and reusable architectures.
  • Advised on low-code platform strategy with emphasis on separation of business logic, audit-trails, and lock-in risks.
TU-Hamburg (AStA)
2019 – 2023

Full-Stack Web Developer and Sysadmin

Django Wagtail-CMS Pretix Ansible Prometheus
  • Developed and maintained a custom CMS backend and frontend, as well as back-office CRUD web applications.
  • Deployed and operated several on-premises services using Ansible, including observability with metrics and alerting.
TU Hamburg (Institute for Communication Networks and Secure Cyberphysical Systems)
2018 – 2023

Teaching Assistant: Internet Security and Data Analysis

Lehrpreis 2020 Raspberry Pi wireshark pandas scikit-learn

Led and developed labs-sessions on the OSI model, network programming and IP, TLS and DNS security as well es an excercises on algorithms, data analysis, visualization and machine learning for up to 25 students.

TM Rescue-Respiration UG (Hamburg, Germany)
2020 – 2022

User Interface Developer for a Medical Device

V-Modell Model-View-Presenter PyQt5 pytest

Implemented a GUI for an ventilator developed by a volunteer team during the COVID19-Pandemic. Financed by the German Federal Ministry for Economic Cooperation and Development and certified by TÜV for manufacturing in developing countries.

Rongheng Information Technology Co. (Shanghai, China)
2019

Intern: Computer Vision Quality Control

SCRUM docker scikit-image

Developed a prototype for industrial defect detection in curved metal surfaces that extracted features and produced a large image dataset.

References available upon request.

Core Competencies

  • Requirements Engineering & Specification: Using DDD, user story mapping, and quality scenarios to derive testable, executable specifications.

  • Security & Privacy by Design: Systematically enforced using STRIDE and LINDDUN, proof of GDPR-compliance.

  • Software Development: Backend systems in statically typed Python (mypy, pydantic, FastAPI); hobby projects in Rust, Haskell, C.

Supporting Skills

  • Architecture & Documentation: C4 modeling, arc42 documentation, and decision logs via ADRs.

  • Web APIs & lightweight Frontends: RESTful APIs with OpenAPI; JAMStack or HTMX for UI.

Collaboration & Leadership

  • Stakeholder Communication: Bridged gaps between domain experts, engineers, and compliance officers.

  • Chair of the Student Council: Elected representative of 7,000+ students.

  • Teaching Assistant: Awarded the Teaching-Prize 2020 for excellence.

Languages

    German

    Native

    English

    C1

    French

    B2

    Dutch

    B1

Education

Belgium

since 2025

Computer Science (M.Sc.), Secure Software

KU Leuven

Germany

2016 – 2024

Computer Science (B.Sc.), Software Engineering

TU Hamburg

France

2022

Erasumus+

Université de Technologie de Compiègne

Belgium

2009 – 2015

Abitur

Pater Damian Sekundarschule Eupen