Freelancer profile translated to English.

Description

I am Dennis Sven Mittmann, a technology expert with over 20 years of experience as CTO and Chief Solutions Architect. My passion lies in translating complex technical challenges into clear, scalable, and secure solutions.

I have led international teams, built innovative platforms in blockchain, e-signature, and LegalTech, always keeping regulatory standards such as ISO 27001, GDPR, and eIDAS in mind. Clients and partners value my ability to combine technological vision with pragmatic feasibility.

As a leader, I work hands-on, solution-oriented, and structured. It is important to me that technology not only works but creates real added value – whether through efficiency, security, or new business models. At the same time, I am convinced that success is created in a team: through clear communication, mutual trust, and the willingness to take responsibility together.

Industry field of expertise

Languages

German
Native or bilingual
English
Conversational

Workplace preferences

Can work on-site

Düsseldorf (up to 50km), Köln (up to 50km)

BlockSign GmbH
CTO
DIGITAL AND IT
April 2024 - Today (2 years and 2 months)
Düsseldorf, Germany
As CTO at BlockSign, I am responsible for the conception, architecture, and implementation of a blockchain-based e-signature and LegalTech platform. My focus is on combining classic web architecture with state-of-the-art Web3 technologies to create legally compliant, scalable, and user-friendly solutions.

I have over 20 years of experience in software architecture, IT security, and building high-availability SaaS systems. With Docufi3d, we developed a platform that seamlessly integrates AI-powered contract analysis, OCR, translation, and text-to-speech – setting new standards in efficiency and compliance.

My focal points:

Architecture and scaling of SaaS and LegalTech platforms

Blockchain integration (Cardano, SSI, Smart Contracts, IAMX)

AI-powered workflows (Contract Analysis, TTS, Translation)

Regulatory standards (ISO 27001, GDPR, eIDAS)
Compliance Agile method IT Project Management IT Architecture Data Analysis
IAMX AG
CTO
DIGITAL AND IT
August 2021 - Today (4 years and 10 months)
Zug, Switzerland
As CTO of IAMX AG, I combine over 20 years of experience in software architecture, blockchain development, and IT security with a clear focus on innovative identity and signature solutions.
I have led international teams, scaled complex platforms, and successfully integrated regulatory standards such as ISO 27001, eIDAS, and GDPR into technical systems.
My expertise ranges from high-availability architectures (Ubuntu, Nginx, PHP-FPM, Laravel, MySQL, Redis, RabbitMQ) and Cardano-based blockchain solutions to AI-powered LegalTech workflows.

I support companies with:

Architecture & scaling of SaaS platforms

Blockchain integration (SSI, DID, IAMX Wallet, Smart Contracts)

E-signature & identity solutions with a regulatory focus

AI-powered contract and document processes
LegalTech Workflows Software & Solutions Architecture Agile Project Management Compliance Technical Documentation
Handy.de
Chief Solutions Architect
TELECOMMUNICATIONS
July 2021 - December 2024 (3 years and 5 months)
Düsseldorf, Germany
Chief Solutions Architect – Handy.de
As Chief Solutions Architect at Handy.de, I develop and am responsible for the overall technical architecture for digital platforms in the telecommunications and e-commerce sectors. My focus is on the conception and implementation of scalable, secure, and performant solutions – from system architecture and API design to cloud infrastructures.

I combine over 20 years of experience in software development, blockchain integration, payment systems, and high-availability architectures (Ubuntu, Nginx, PHP-FPM, Laravel, MySQL, Redis, RabbitMQ) with a clear goal: efficient, future-proof systems that simplify business processes and enable growth.

My focal points:

Architecture & scaling of complex SaaS platforms

Integration of payment and identity solutions

Cloud infrastructure & DevOps (CI/CD, Containers, Automation)

E-commerce & telecommunications solutions
Data Analysis API Payment Gateways IT Architecture High-Availability SaaS & Web Stacks