Portfolio
Lasse Siemoneit
Software Engineer & Product Owner
I bring together software engineering, platform operations, and product ownership to build robust, privacy-compliant systems that hold up in real-world operation.
Career
My path started at 16 as a consultant in a start-up. For over five years I have worked as a full-stack developer and in the operation of digital infrastructure — from the first draft through implementation to running it in production. My focus is planning and delivering software projects and container platforms.
ITSC GmbH
06/2024 – Present · Hannover, Remote
IT service provider for public health insurers. Inside ITSC my role has grown from platform operations through software engineering to product ownership of an internal AI assistant.
Systems Administrator06/2024 – Present
Operating and optimizing the container platform of public health insurers: OpenShift/Kubernetes clusters, Linux servers, networks and microservices running in cluster mode.
Software EngineeringPresent – Present
Moving from platform operations into software engineering — building internal applications and integrations on top of the existing cluster infrastructure.
Product Owner of an internal AI assistant04/2026 – Present
Product ownership for an internal AI assistant: multi-agent architecture, MCP-based tool calling instead of classic RAG, EU data residency and GDPR compliance, plus Teams integration. Prioritization, architecture decisions and trade-offs from a product perspective.
- OpenShift
- Kubernetes
- Linux
- Docker
- Microservices
- Multi-agent architecture
- MCP
Just Relate Group GmbH
01/2024 – Present · Berlin, Remote
Software Engineer01/2024 – Present
Customizing the Pisa Sales CRM for individual client requirements. Initiated and implemented an AI integration to raise CRM efficiency and lay the groundwork for future product connections.
- Java
- Spring Boot
- CRM
- AI integration
- REST APIs
Vidama GmbH
12/2021 – 01/2024 · Oldenburg, Remote
Chief Technology Officer12/2021 – 01/2024
As the sole developer, responsible for all custom software development — from planning through implementation to maintenance of complex client solutions such as the sales-partner media library for EWE and osnatel.
- Python
- Flask
- FastAPI
- Java
- Docker
- CI/CD
Lasse Siemoneit
04/2021 – Present · Hatten, Remote
Owner / Freelance Software Engineer04/2021 – Present
Building tailored software solutions and advising on digital transformation. Strategic use of digital technology for process optimization and long-term competitiveness.
- Full-stack
- Java
- Python
- Cloud
- Consulting
Heinsohn IT Solutions GmbH
05/2021 – 12/2021 · Westerstede, Remote
Consultant / Software Engineer05/2021 – 12/2021
Advised clients on digitalization with Microsoft 365 as a Microsoft partner company. Delivered presentations on Teams and M365 products and built client-specific software with Azure interfaces.
- Microsoft 365
- Azure
- Teams
- Consulting
Projects
ELIA — multi-agent AI assistant
Internal AI assistant for an IT service provider serving health insurers: a multi-agent architecture with MCP-based tool calling instead of classic RAG (live data rather than a vector index) and a feature-flagged orchestrator migration to a current agent framework. EU data residency and GDPR as a deliberate platform decision, connected to the ITSM system, wiki and Teams.
- Multi-agent architecture
- MCP
- Agent framework
- EU data residency
- GDPR
- Teams integration
Sales Partner Media Library for EWE & osnatel
12/2021 – 01/2024
Enterprise media library for sales partners: manage campaign films, assign them regionally and play them in the shop — with template-based content creation and an end-to-end role model.
- Java
- Spring Boot
- Vaadin
- PostgreSQL
- Docker
- CI/CD
OpenShift platform operations for public health insurers
since 06/2024
Operating and optimizing a container platform for public health insurers: OpenShift/Kubernetes clusters, Linux servers and microservices in cluster mode — the technical foundation the later product work builds on.
- OpenShift
- Kubernetes
- Linux
- Docker
- Microservices
Disy-One — digital signage platform
12/2021 – 01/2024
Media management platform for enterprises: configurable playback on steles, TVs and perimeter boards for EWE, Olantis, Famila and insurers. A scalable Python platform with monitoring and containerized deployment.
- Python
- Flask
- FastAPI
- Docker
- Grafana
- Prometheus
Sport Event Controller
12/2021 – 01/2024
Real-time control of media playback at sports events — team walk-outs, sponsor content and live orchestration for Handball Bundesliga clubs, driven over WebSocket with a simple operator interface.
- Python
- Flask
- WebSocket
- Docker
- FastAPI
Real-estate site builder
12/2021 – 01/2024
One-page generator for real-estate projects: build landing pages from templates — no coding required. A template-based builder with dynamic content management.
- Java
- Spring Boot
- Thymeleaf
- PostgreSQL
- Docker
Skills
Web & Application Engineering
- Java & Spring Boot5 yrs
- Python (Flask, FastAPI)4 yrs
- Vaadin4 yrs
- TypeScript & JavaScript5 yrs
- REST APIs & WebSocket5 yrs
Cloud & Container Platforms
- OpenShift & Kubernetes2 yrs
- Docker5 yrs
- Linux server operations5 yrs
- AWS & Azure4 yrs
Databases
- PostgreSQL & MySQL5 yrs
- MongoDB & Redis3 yrs
DevOps & CI/CD
- GitLab CI & Jenkins5 yrs
- Prometheus & Grafana3 yrs
- Ansible & shell automation3 yrs
AI & Integration
- Multi-agent architecture1 yrs
- MCP-based tool calling1 yrs
- Agent framework orchestration1 yrs
About
Self-taught software engineer and product owner — from consultant at 16 through full-stack and platform operations to product ownership of an internal AI assistant.
More about me →Activity
Contact
Let's work together — I'd love to hear from you.
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