Software Engineering & Technical Leadership
I help companies build robust, scalable software products. From hands-on fullstack development to leading engineering teams and designing system architectures — I bridge the gap between business needs and technical excellence.
End-to-end software engineering consulting, from concept to production.
Building complete applications from database to UI, with clean architecture and automated test coverage at every layer.
Guiding engineering teams to deliver high-quality software through mentorship, sound architecture decisions, and pragmatic processes.
Designing microservice architectures, evaluating technology choices, and translating business requirements into scalable technical solutions.
A broad and battle-tested technology toolkit, refined over 15+ years of hands-on delivery.
A selection of projects delivered across industries, from startups to enterprise environments.
Building a platform for a charging infrastructure provider managing 2,000+ charge points, covering billing, monitoring, partner coordination, and a customer self-service portal with BPMN-driven process automation.
Migrated multiple user-group-specific products to a unified technical platform with shared reusable components and user-group-specific extensions, driving cross-team architecture collaboration.
Migrated an IoT platform from AWS to Azure, replacing AWS-specific services with cloud-agnostic solutions including Kafka for messaging, while improving test automation and establishing a pairing culture.
Consolidated multiple identity providers into a centralized enterprise-wide Keycloak-based SSO solution, including migration from JBoss to Quarkus and training international departments on integration.
Built a custom online shop for selling and renting EV charge points, including IoT utilities for warehouse stock management and remote firmware updates via OCPP.
Led the development of an electricity tariff product for a photovoltaic rental company, integrating Salesforce, an energy ERP, and customer-facing web forms.
Rebuilt an Access-based asset management system into a modern event-sourced platform, enabling complex reporting, fine-grained auditability, and continuous migration.
Reverse-engineered a decades-old database and built a migration strategy with visualization tools, iterative migration logic, and Kubernetes-based infrastructure.
Delivered an MVP for a direct B2C car insurance product including a rate calculator widget, mobile app via Ionic, and headless CMS integration with Contentful.
Created a fully automated NLP-powered solution linking recipe ingredients to grocery store products, with an embeddable JavaScript widget for partner websites.
Built a machine-learning-powered recommendation engine using basket analysis and user profiles, processing data at scale with Spark clusters in Google Cloud.
Developed a unified data lake consolidating data silos with ETL pipelines in the Hadoop ecosystem, enabling ad-hoc analysis with data integrity and anonymization.
Looking for an experienced software engineer or tech lead for your next project? I'm always open to discussing new challenges and opportunities.
Whether you need a fullstack developer, a tech lead, or an architecture review — let's find out how I can help.
Send an Email
Wels Holding GmbH
Knipweg 63
47533 Kleve
Deutschland
Geschäftsführer: Stephan Lensch
Telefon: +49 173 5477782
E-Mail: info@wels-holding.com
Eintragung im Handelsregister:
Registergericht: Amtsgericht Kleve
Registernummer: HRB 14548
DE 310 902 888