I'm Holger Hahn, a Solution Architect and Software Engineer with 15+ years of experience in digital banking, NFT, and Web3. I love turning messy, fragmented workflows into automated, compliant platforms and delivering production-grade systems. I’ve replaced legacy custody operations with modern, Fireblocks-based solutions and built audited smart contracts in Rust for staking and governance. I’m comfortable working with banks, NFT innovators, and startups alike, and I enjoy leading testing efforts from manual to CI-driven automation. In addition to hands-on development (Python, Rust, Kubernetes, AWS, Node.js, Linux, Docker, CosmWasm), I’ve designed architectures that scale, integrated complex data flows, and guided teams to compliant, secure, and reliable implementations. My focus is on practical, end-to-end delivery that aligns business needs with technical realities.

Holger Hahn

I'm Holger Hahn, a Solution Architect and Software Engineer with 15+ years of experience in digital banking, NFT, and Web3. I love turning messy, fragmented workflows into automated, compliant platforms and delivering production-grade systems. I’ve replaced legacy custody operations with modern, Fireblocks-based solutions and built audited smart contracts in Rust for staking and governance. I’m comfortable working with banks, NFT innovators, and startups alike, and I enjoy leading testing efforts from manual to CI-driven automation. In addition to hands-on development (Python, Rust, Kubernetes, AWS, Node.js, Linux, Docker, CosmWasm), I’ve designed architectures that scale, integrated complex data flows, and guided teams to compliant, secure, and reliable implementations. My focus is on practical, end-to-end delivery that aligns business needs with technical realities.

Available to hire

I’m Holger Hahn, a Solution Architect and Software Engineer with 15+ years of experience in digital banking, NFT, and Web3. I love turning messy, fragmented workflows into automated, compliant platforms and delivering production-grade systems. I’ve replaced legacy custody operations with modern, Fireblocks-based solutions and built audited smart contracts in Rust for staking and governance. I’m comfortable working with banks, NFT innovators, and startups alike, and I enjoy leading testing efforts from manual to CI-driven automation.

In addition to hands-on development (Python, Rust, Kubernetes, AWS, Node.js, Linux, Docker, CosmWasm), I’ve designed architectures that scale, integrated complex data flows, and guided teams to compliant, secure, and reliable implementations. My focus is on practical, end-to-end delivery that aligns business needs with technical realities.

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Experience Level

Expert
Expert
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Expert
Expert
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Expert
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Language

German
Fluent
English
Advanced

Work Experience

Solution Consultant (Freelancer) at Hauck Aufhäuser Digital Custody GmbH
July 31, 2025 - July 31, 2025
Supported end-to-end delivery of secure, customer-focused digital asset solutions, encompassing requirements analysis, architectural design, integrations (e.g., Fireblocks), data/API design, documentation, and go-live. Transformed Excel-based workflows into an automated reserves and transaction management custody platform; performed risk analysis and migration of an AWS-based wallet custody.
Blockchain Consultant (Freelancer) at AlTalis OÜ
April 1, 2022 - November 20, 2025
Talis.art NFT marketplace integration of Web3/NFTs with physical services (e.g., print-on-demand). Built audit-approved smart contracts in production managing multi-million euro scope. Operated Proof-of-Stake validators in the Cosmos ecosystem.
Test Engineer / Blockchain (Freelancer) at blocknox GmbH (Stuttgart Stock Exchange Group)
March 31, 2022 - March 31, 2022
Designed and implemented E2E test platforms involving blockchain node interaction and smart contracts; aligned technical testing with business requirements and infrastructure constraints.
Test Engineer (Freelancer) at C24 GmbH
February 28, 2021 - February 28, 2021
Developed test strategies to validate banking features with automation; integrated testing into the development lifecycle to increase coverage and release confidence.
Solutions / Data Architect (Freelancer) at Vorwerk International
May 31, 2020 - May 31, 2020
Led domain and data architecture for the TM6 product line; created migration and transformation concepts to enhance data quality.
Data Architect (Freelancer) at AMAN Media GmbH
September 30, 2015 - September 30, 2015
Migrated and restructured legacy systems with a focus on business object design and data quality.
Consultant / Cloud Architect at RVC Roland Vollmer Consulting GmbH
March 31, 2010 - March 31, 2010
Delivered SaaS and virtualized infrastructure solutions for SMEs and enterprise clients.
Embedded Systems Developer at emlix GmbH
September 30, 2007 - September 30, 2007
Built a generic application framework for embedded Linux devices in C++.
Apprentice – IT Specialist (Application Development) at TheBoX Communications GmbH
July 31, 2004 - July 31, 2004
Developed PBX systems based on VoIP.

Education

Bachelor’s Degree, Applied Computer Science - Embedded Systems at Hochschule Fulda
January 1, 2006 - December 31, 2010
Advanced Technical Certificate, Electrical & Electronics Engineering at Ferdinand-Braun-Schule Fulda
January 1, 2004 - December 31, 2005

Qualifications

Certified Professional for Software Architecture - Foundation (CPSA-F)
January 11, 2030 - November 20, 2025
The Secret of a Perfect Performance (Tobias Beck)
January 11, 2030 - November 20, 2025
Master Class of Human Skills (Tobias Beck)
January 11, 2030 - November 20, 2025

Industry Experience

Financial Services, Software & Internet, Media & Entertainment, Professional Services, Other