Work samples

Selected Project Work

Proof of product ownership, architecture, technical leadership, and hands-on delivery under real conditions. Taken together, these cases show how I connect problem definition, decisions, implementation, release, operations, and learning from production as one responsibility chain.

What to read for

The entry point varies. I understand the problem, set a viable direction with the people involved, create clarity across teams, step into delivery when useful, and use real signals for the next decision.

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100+

Scale

Technical responsibility and delivery scaled across 15 remote teams without adding another management layer.

Problem → operations

End-to-end responsibility

Product clarification, architecture, implementation, release, and production learning as one responsibility chain.

AI/LLM + Data

System breadth

Agentic workflows, RAG, SQL/NoSQL, search, and data pipelines connected to real product work.

CI/CD + DevOps

Platform operations

Cloud scale, messaging, observability, IaC, and delivery pipelines as one operational proof point.

Cases

The cases make recurring operating patterns visible.

0→1 builds, platform transformation, leadership across many teams, AI-native product and engineering work, and data-intensive systems are different contexts. They are connected by clear decisions, built-in quality, operable delivery, and responsibility beyond release.

Livable Places GmbH

Hands-on CTO at Livable Places

Evolved S-Core under real product and operating responsibility: connected problem clarification and stories -- for a period without an assigned Product Owner -- with hands-on Vue/TypeScript and Kotlin/Spring Boot work, monorepo delivery, workers, geo data, AI/ML, and platform operations.

since Jul 202590% Remote / Hamburg

WPS MANAGEMENT GMBH

CTO at WPS MANAGEMENT // wescale

Remote product development at 100+ developer scale needed flow, ownership, and technical direction. I led 15 cross-functional teams with FaST Agile, golden paths, flow metrics, Cypress tests, GitLab/GitLab CI, GKE context, and cloud-native architecture on GCP/Azure in a you build it, you run it model; I also covered interim Product Owner responsibility for one team.

Sep 2023 - Jun 2025100% Remote / Paderborn

LGE Energy Berlin GmbH // Zenstrom

Website and Service Portal for Zenstrom

Zenstrom needed a website and service portal that could support tariff signup, login, customer data, invoices, and operations. I built and ran both Astro products independently from product idea to monitoring.

Jun 2023 - Dec 2023100% Remote / Berlin

Responsibility arc

QYRAGY GmbH

Multiple cases in one context: expanded role, new phase, or clean handover after the transition.

2 casesJul 2020 - Nov 2023

FreelanceFull-time

May 2023 - Nov 2023

Fractional CTO Advisory for Smartjobr

After product-market fit, Smartjobr needed technical strategy for the next growth phase. I advised on technology selection, team building, architecture decisions, AI matching context, operations readiness, and scaling direction.

Jul 2020 - Apr 2023

Hands-on CTO & Chief Product Owner for AI Matching Platform

As CTO and CPO, owned the QYRAGY website and Smartjobr from product model and market learning through production and operations. Smartjobr connected AI matching, web/app clients, Next.js/PWA, Python/AWS, and PostgreSQL.

SIBB e.V. // Adalan AI

Software Architecture Consulting for Adalan AI

Adalan AI needed early technical direction for a SaaS platform around AI risk assessment. I advised on architecture, technology selection, product strategy, and UI/UX trade-offs.

May 2023100% Remote

Responsibility arc

Mondosano GmbH

Multiple cases in one context: expanded role, new phase, or clean handover after the transition.

2 casesJan 2018 - Nov 2020

FreelanceFull-time

Jul 2020 - Nov 2020

Freelance Engineering Support at Mondosano

After the CTO phase, Mondosano needed targeted freelance engineering support inside a familiar SaaS platform. I handled uploader work, bug fixing, Cypress tests in a test-first mode, and technical support for existing systems.

Jan 2018 - Jun 2020

Hands-on CTO for Health SaaS

A health-study SaaS platform built from 0 to 1: product model, team setup, backend, frontend, DevOps, CI/CD, Cypress tests, monitoring, and production operations on AWS shaped as one end-to-end responsibility.

SISTRIX GmbH

SERP Parser for SEO Analytics at SISTRIX

SEO analytics at SISTRIX needed a reliable SERP Parser for countries, devices, and SERP Features. I built parser work, status dashboards, Spark/Hadoop extraction, CI/CD delivery, Docker, and Mesos/Marathon operations. Dashboards, Cucumber/Selenium tests, and observability made runtime behavior visible.

Sep 2016 - Jan 2018Bonn

USU AG | Business Solutions

Java Team Lead & Project Manager at USU

USU combined Java team leadership, portal project management, agile change, and strategic technology work. I led 7 consultants, worked in the Tech Board, and led the technical concept and implementation of a project involving multiple participating companies while deliberately steering it toward more transparent, iterative collaboration.

Apr 2016 - Aug 2016Bonn

Responsibility arc

SEOlytics GmbH

Multiple cases in one context: expanded role, new phase, or clean handover after the transition.

3 casesNov 2013 - Mar 2016

Full-time

May 2015 - Mar 2016

Head of Development at SEOlytics

SEOlytics needed clearer technical direction while moving toward microservices. I led internal and external developers, connected architecture with product development, the delivery system, Selenium-based quality work, and operations.

Nov 2014 - May 2015

Scrum Master & Backend Delivery at SEOlytics

SEOlytics needed clearer flow between frontend, backend, product, and management. I introduced Scrum, made impediments visible, and used Definition of Done and work readiness to improve team steering.

Nov 2013 - Oct 2014

SEO Backend Development with Big Data

SEOlytics needed backend systems for large SEO data flows. I worked on microservices, a substantial JMS/HornetQ landscape, Daily Rankings data, database reengineering, Java/Scala, Docker/AWS, Google APIs, release management, and team coaching. Across my full SEOlytics tenure, the responsibility extended from problem definition and product work through production operations.

Immonet GmbH // Axel Springer AG

Java EE Development for Real Estate Portal

In Immonet's real-estate search team, I owned work from problem definition through implementation and delivery to Jenkins deployments, log analysis, and application monitoring. Dedicated administrators owned the underlying operations.

May 2013 - Oct 2013Hamburg

Responsibility arc

dtms GmbH

Multiple cases in one context: expanded role, new phase, or clean handover after the transition.

8 casesMar 2012 - Apr 2013

Full-time

Feb 2012 - Apr 2013

Enterprise Java MDM Component

Mobile device administration needed a dedicated MDM component. I designed and implemented device, app, and user management with Java 7, Apache Wicket 6.8, JPA/Hibernate, and Google Guice.

Dec 2012 - Jan 2013

iOS Backend Reengineering

An outdated iOS backend needed analysis, refactoring, and clearer data interfaces. I worked through persistence, code, use cases, JSON/XML processing, CSV export, SOAP integration, and configuration.

Jul 2012 - Nov 2012

Mobile Device Management System

Enterprise mobile administration needed device management, app management, user management, and messaging in one system. I built the complete mobile device platform from problem definition through iOS and Java implementation to delivery and production-near application support. Dedicated administrators owned server and database operations.

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Jun 2012 - Jul 2012

SMS-Email Integration System

Bidirectional SMS-email communication needed a reliable Java backend and web interface. I connected conversion workflows, persistence, administration, and code-quality checks.

Jun 2012 - Jun 2012

SMS Processing Cluster Architecture

Request spikes in SMS processing needed a clearer cluster concept. I designed and estimated an architecture around In-Memory Data Grid, BigData processing, NoSQL integration, and GlassFish Server.

May 2012 - Jun 2012

SMS Processing Reengineering with 17x Throughput

Within a telecommunications value-added services platform covering call center routing and SMS services, a critical SMS processing system moved from 40 to 700 SMS/sec. The work combined reengineering, word filtering, an SMS ticker, Jersey JAX-RS, JPA/Hibernate, and iterative performance tuning and production-near application changes. Dedicated administrators owned server and database operations.

Apr 2012 - May 2012

RESTful iOS Backend Development

iOS clients needed a RESTful Java backend with binary plist exchange, statistics delivery, and news management. Jersey JAX-RS, JPA/Hibernate, MySQL, and Google Guice formed the base.

Mar 2012 - Apr 2012

Enterprise Java Configuration UI

A data-processing backend needed a controllable configuration layer. I built the interface with Apache Wicket 1.4, JPA/Hibernate, Google Guice, MySQL, Tomcat, TestNG, and Selenium.

Computacenter AG & Co. oHG

Data Center Infrastructure Engineering for Telefonica Germany

Telefonica Germany's data center infrastructure needed lifecycle support across planning, build-out, expansion, operations, documentation, hardware support, and SLA-critical fault diagnosis.

Oct 2010 - Feb 2012Bielefeld

Cosmic Applications / MotionTap

MotionTap: iOS Multi-Touch Game in the App Store

MotionTap was a real iPhone game launched in the App Store: multi-touch gameplay, iOS/Objective-C, cocos2d, precise finger tracking, online highscores, multilingual UI, and distribution through a self-founded company.

Apr 2009 - Nov 2009

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