Architecture · Cryptography · Training
Better Software.
Starting Now.
I'm Martin Bosslet - a freelance software architect and CTO-as-a-Service consultant. I support startups, SMEs, enterprises, and public institutions with structure, direct development work, and sound technical decisions. From cryptography and digital signatures to modern web architecture and AI-assisted development.
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200+
Satisfied Clients
20+
Years of Experience
75+
Completed Projects
475+
Conducted Workshop Days
Experience that counts.
From architecture and web development through cryptography, Git, and AI-assisted development to security audits: I combine strategic depth with direct implementation and practical training.
AI-Assisted Development
AI-assisted development and AI-assisted legacy migration with a methodical use of Copilot, Claude Code, Cursor, and similar tools — productive, transparent, and free of hype or tool drama.
Software Architecture
Architecture decisions, system design, and technical structure for systems that do not just work today, but can still be understood and maintained by teams over the long term.
Cryptography
Digital signatures, PKI, AdES, encryption, and post-quantum cryptography — grounded in real project work across implementation, consulting, and audits in security-critical environments.
Git & GitOps
Git as a concept rather than a command list, plus CI/CD, Docker, Kubernetes, GitOps, and transparent delivery processes for teams that want to work more safely and more reproducibly.
Security & Audits
Web pentests, code audits, technical audits in the context of SOC 2, and cryptographic reviews with a focus on real risk and actionable measures.
Modern Web Development
Modern web development from browser-native frontends to APIs and backend services — pragmatic, maintainable, and based on technology decisions that fit the team and the project.
How I Can Help.
CTO-as-a-Service, development & architecture, workshops, and pentesting & security — direct, practical support with a focus on sound technical decisions.
CTO-as-a-Service
CTO-as-a-Service for situations where important technology decisions, structure, and experienced technical leadership that stays close to implementation are needed. From greenfield planning to team stabilization and the modernization of grown systems.
More...Development & Architecture
Building web applications, APIs, and backend services, plus architecture support for systems teams can understand, operate, and evolve over the long term.
More...Pentesting & Security
Web pentests, code audits, technical audits in the context of SOC 2, and cryptographic reviews through to post-quantum migration.
More...Workshops & Training
Practice-oriented training on Git, AI-assisted development, modern languages & frameworks, and cryptography — many of them refined over more than 15 years.
More...Client Testimonials
What clients say about working with me. Testimonials from companies that have benefited from my expertise and consulting.
Bei Martin immer gut :) Das Thema - was ja recht trocken ist - hat Martin sehr gut vermittelt. Es wurde stets auf Fragen eingegangen und immer fachlich präzise geantwortet.
Anonym
Feedback zu Kryptographie-Schulung
Sehr hohe Relevanz und Praxisnähe, gute Vermittlung der technischen Hintergründe. Realistischer Blick auf Schwächen und Risiken der Technik. Sehr kompetenter und angenehmer Dozent.
Anonym
Feedback zu KI-Schulung
Sehr kompetent, erklärt sehr gut, Skript, Struktur top. Gute Beispiele. Viel Praxis. Super auf meine Frage eingegangen.
Anonym
Feedback zu GitOps-Schulung
Trainer war sehr kompetent und sympathisch. Ging auf jede Frage ein und konnte alles gut und zufriedenstellend erklären.
Anonym
Feedback zu Git-Schulung
Companies and Institutions I Have Worked With
DAX-listed enterprises, public institutions, research organizations, and leading companies across industries are among the organizations I have worked with — through project work as well as training engagements (some on behalf of training providers).
BMW AG 
Siemens AG 
Volkswagen AG 
Continental AG 
Robert Bosch GmbH 
Deutsche Telekom 
Deutsche Post AG 
ALDI Einkauf SE & Co. oHG 
REWE Digital GmbH 
EDEKA ZENTRALE Stiftung & Co. KG 
Commerzbank AG 
KfW Bankengruppe 
E.ON Digital Technology GmbH 
Evonik Industries AG 
Ernst & Young GmbH 
Lufthansa Industry Solutions AS GmbH 
Fielmann AG 
Birkenstock Product GmbH 
Zurich Insurance Group 
RheinEnergie AG 
T-Systems International GmbH 
Ernst Klett Verlag GmbH 
Europäische Kommission 
Bundeswehr BMW AG Siemens AG Volkswagen AG Continental AG Robert Bosch GmbH Deutsche Telekom Deutsche Post AG ALDI Einkauf SE & Co. oHG REWE Digital GmbH EDEKA ZENTRALE Stiftung & Co. KG Commerzbank AG KfW Bankengruppe E.ON Digital Technology GmbH Evonik Industries AG Ernst & Young GmbH Lufthansa Industry Solutions AS GmbH Fielmann AG Birkenstock Product GmbH Zurich Insurance Group RheinEnergie AG T-Systems International GmbH Ernst Klett Verlag GmbH Europäische Kommission Bundeswehr 
Bundeskriminalamt 
Bundesbank 
Bundesamt für Sicherheit in der Informationstechnik 
Bundesdruckerei GmbH 
Bundesministerium des Innern und für Heimat 
Deutsche Rentenversicherung 
Gematik GmbH 
Deutscher Wetterdienst 
Fraunhofer Institut für Integrierte Schaltungen IIS 
Forschungszentrum Jülich GmbH 
LMU München 
Technische Universität Dresden 
AXA Konzern AG 
Generali Deutschland Versicherung AG 
Gothaer Lebensversicherung AG 
HDI Systeme AG 
LVM Versicherung 
VHV Versicherungen 
DEVK Sach- und HUK Versicherungsverein a.G. 
Provinzial Rheinland Versicherung AG 
R+V Allgemeine Versicherung AG 
Helaba Invest Kapitalanlagegesellschaft mbH 
IKB DeutscheIndustriebank AG 
DB Systel GmbH Bundeskriminalamt Bundesbank Bundesamt für Sicherheit in der Informationstechnik Bundesdruckerei GmbH Bundesministerium des Innern und für Heimat Deutsche Rentenversicherung Gematik GmbH Deutscher Wetterdienst Fraunhofer Institut für Integrierte Schaltungen IIS Forschungszentrum Jülich GmbH LMU München Technische Universität Dresden AXA Konzern AG Generali Deutschland Versicherung AG Gothaer Lebensversicherung AG HDI Systeme AG LVM Versicherung VHV Versicherungen DEVK Sach- und HUK Versicherungsverein a.G. Provinzial Rheinland Versicherung AG R+V Allgemeine Versicherung AG Helaba Invest Kapitalanlagegesellschaft mbH IKB DeutscheIndustriebank AG DB Systel GmbH 
GLS Germany GmbH & Co. OHG 
Amprion 
TransnetBW GmbH 
Next Kraftwerke GmbH 
NetCologne GmbH 
EnBW 
Krauss-Maffei Wegmann 
Atlas Elektronik GmbH 
Safran Data Systems GmbH 
Zeppelin Baumaschinen GmbH 
ABUS 
TÜV Rheinland LGA Products GmbH 
CompuGroup Medical 
DIaLOGIKa GmbH 
Diehl Metering 
Hörmann KG Verkaufsgesellschaft 
Finanz Informatik GmbH & Co.KG 
Whitebox GmbH 
LuxTrust S.A. 
BWI GmbH 
Santander Consumer Operations Services 
Diesel Technic SE GLS Germany GmbH & Co. OHG Amprion TransnetBW GmbH Next Kraftwerke GmbH NetCologne GmbH EnBW Krauss-Maffei Wegmann Atlas Elektronik GmbH Safran Data Systems GmbH Zeppelin Baumaschinen GmbH ABUS TÜV Rheinland LGA Products GmbH CompuGroup Medical DIaLOGIKa GmbH Diehl Metering Hörmann KG Verkaufsgesellschaft Finanz Informatik GmbH & Co.KG Whitebox GmbH LuxTrust S.A. BWI GmbH Santander Consumer Operations Services Diesel Technic SE Let's build something great together.
Whether you need a fractional CTO, a cryptography expert, or a workshop trainer — I bring 20+ years of real-world experience to your table.
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