Work samples

Selected Project Work

Proof of product, engineering, and delivery under real conditions. These cases show where I take responsibility: from 0→1 platforms and scaling to AI-native systems craft, SQL/NoSQL depth, messaging, CI/CD, and reliable platform operations.

What to read for

Read these cases as risk reduction, not as a role list: technical depth, product ownership, delivery maturity, data/platform depth, and impact in real teams.

100+

Scale

Developers scaled remotely without adding another management layer.

~70%

Deployment frequency

Higher delivery frequency through flow focus, golden paths, and clearer team ownership.

SQL/NoSQL

Data breadth

Relational, NoSQL, search, graph, cache, and storage systems across product generations.

CI/CD + DevOps

Platform operations

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

Cases

Not every case matters equally. What matters is the pattern behind the work.

This selection surfaces decision signals: 0→1 builds, scaling, platform operations, AI-adjacent product work, SQL/NoSQL breadth, messaging, CI/CD, and delivery systems that had to work under real pressure.

Livable Places GmbH

Hands-on CTO at Livable Places

Livable Places combines AI-assisted product development, distributed S-Core scoring, geo/census services, office-risk ML experiments, platform operations, and internal planning tooling for the "S" in ESG. I connect those parts into one operable proptech delivery system.

since Jul 2025 90% 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, and cloud-native architecture on GCP/Azure.

Sep 2023 - Jun 2025 100% 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.

Jun 2023 - Dec 2023 100% Remote / Berlin

Responsibility arc

QYRAGY GmbH

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

2 cases Jul 2020 - Nov 2023

Freelance Full-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, and scaling direction.

Jul 2020 - Apr 2023

CTO & Chief Product Owner for AI Matching Platform

A freelancer matching platform built from 0 to 1 with AI in the product core. I connected product model, matching logic, Next.js/PWA, Python/AWS, PostgreSQL, team building, and go-to-market learning loops.

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 2023 100% Remote

Responsibility arc

Mondosano GmbH

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

2 cases Jan 2018 - Nov 2020

Freelance Full-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, 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, and operations shaped as one 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.

Sep 2016 - Jan 2018 Bonn

USU AG | Business Solutions

Java Team Lead & Project Manager at USU

USU combined Java team leadership, portal project management, and strategic technology work. I led 7 consultants, worked in the Tech Board, and helped move project work toward Scrum.

Apr 2016 - Aug 2016 Bonn

Responsibility arc

SEOlytics GmbH

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

3 cases Nov 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, and kept leadership close to delivery.

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, REST/JMS services, Daily Rankings data, database reengineering, Java/Scala, Docker/AWS, Google APIs, release management, and team coaching.

Immonet GmbH // Axel Springer AG

Java EE Development for Real Estate Portal

Immonet's real estate portal work combined Java multi-tier architecture, Scrum, software ergonomics, and maintainable portal development.

May 2013 - Oct 2013 Hamburg

Responsibility arc

dtms GmbH

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

8 cases Mar 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 connected iOS, Apple Push Notifications, and a Java backend.

Show 5 more cases

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

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.

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, and TestNG.

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 2012 Bielefeld

iPhone Plugin Framework for Mobile Learning Content

An early iPhone product concept for mobile learning content: a plugin-like view framework, XML-described interfaces, content subscriptions, offline use, interactive exercises, and in-app purchases as product mechanics.

Jan 2010 - May 2010

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.

Synaxon AG

Gamified Product Data Quality System

Product data quality at Synaxon needed user participation, motivation, and validation. I built a JSF/JEE system with gamification, rewards, user management, and quality assurance for more reliable purchasing decisions.

Apr 2008 - Jul 2008 Bielefeld

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