Cloud Platform & Data Engineer · Karlsruhe
SemjonGeist.
For 8+ years I've been building data platforms, cloud infrastructure and, more recently, edge AI at ChronoLite. Calm architecture, robust pipelines, honest consulting — based in Karlsruhe.
- Cloud engineering
- Data engineering
- Edge AI / ML
- Founder & consulting
// About
Data platforms, cloud and edge AI — held together by clean engineering practice.
Cloud platform & data engineer with 8+ years of experience in data architecture, cloud infrastructure and software development. My path runs from scalable ETL platforms and data-lake architectures at IONOS through data-platform migrations at adesso to co-founding an AI startup in the edge-AI space.
My core strength is connecting data engineering with modern cloud and DevOps practice: Kubernetes infrastructure, infrastructure as code, CI/CD pipelines and pipeline orchestration with Airflow. I add full-stack experience (Vue/Nuxt, FastAPI) and edge-optimised AI models for real-time applications.
As co-founder of ChronoLite Technologies I own the technical architecture of an on-device AI platform for contact-free breathing monitoring — privacy-first, no cloud dependency, B2B-licensed.
// Work
Roles that shaped the profile.
From ETL platform engineering at IONOS, through data-platform migration at adesso, to founding ChronoLite Technologies.
- 03/2026 – presentcurrent
Co-founder & Head of Technology · ChronoLite Technologies UG
AI startup for on-device temporal pattern analysis. First use case: contact-free breathing monitoring for baby cameras via video analysis — no extra sensors, no cloud. Alongside the product: solution-driven consulting with clear leverage — focused, well-scoped engagements.
- Owns the entire technical platform architecture and product development.
- Building an ML-Ops platform (MLStudio) from multiple .NET microservices: model registry, training manager, evaluation, annotation.
- Edge-optimised AI models for real-time breathing analysis on ARM Cortex-A53+ running embedded Linux.
- Privacy-first: fully on-device processing, B2B licensing as firmware module or SDK.
- Nuxt 4
- C# / .NET 9
- PostgreSQL
- MinIO
- Kubernetes
- Helm
- PyTorch
- Edge AI
- Computer Vision
- Gcore FastEdge
- 07/2024 – 03/2026
Cloud Engineer · adesso SE
Client engagement at a major insurance-industry customer. Focus: data-platform migration onto Snowflake/dbt and building cloud-native infrastructure.
- Stabilising productive Oracle data processes, fixing broken runs, data gaps and performance bottlenecks.
- Migrating the existing data landscape onto Snowflake + dbt including reconciliation and validation.
- Co-building the internal cloud-native community: open-source data platform, Kubernetes, IaC, CI/CD, landing page.
- Designing and delivering trainings on Airflow and big-data technologies in the cloud.
- Oracle
- Snowflake
- dbt
- Airflow
- Kubernetes
- Terraform
- GitHub Actions
- Nuxt
- 03/2024 – 07/2024
Full-Stack Engineer · KorrekturKumpel
EdTech startup for AI-assisted correction and grading of educational materials.
- Built the web application as full-stack engineer (frontend and backend).
- Integrated LLMs for automated correction and grading.
- Python
- Nuxt
- FastAPI
- Supabase
- LLMs
- 10/2020 – 03/2024
ETL Engineer · IONOS SE
Data Factory & Cloud Support Systems. Built ETL platform, data-lake / data-mesh architecture and CI/CD via Pentaho, Airflow, GitLab, Harbor, Artifactory.
- Pentaho Kettle: jobs, multi-environment management (QA/DEV/PRO) and extension of the S3 module in Java — later adopted by CC and Strato.
- Airflow architecture, dynamic DAGs, custom plugins, rollout processes.
- Data-lake / lakehouse driver: Trino + Superset architecture, Delta evaluation, Kafka Connect (CDC).
- GitLab administration, CI/CD pipelines for R, Python, Maven, Helm, Docker; Harbor + Artifactory automation.
- Mentoring working students and apprentices, organising the "Innovation Friday" workshops.
- Python
- Java
- R
- PostgreSQL
- Kafka
- Trino
- Airflow
- Pentaho
- Kubernetes
- GitLab CI/CD
- Helm
- Docker
- 10/2017 – 10/2020
B.Sc. Business Informatics (work-study) · United Internet AG / DHBW Karlsruhe
Work-study programme at DHBW Karlsruhe with United Internet / IONOS. Thesis at the Big Data & AI Competence Center.
- Thesis: predictive model for hosting customer issues to improve support.
- Project work on CMS integration and licence management in cloud computing.
- Python
- R
- Machine Learning
- WordPress
- Cloud
- 02/2021 – presentcurrent
Data Logger Developer (Side Engagement) · Hamman Theurer Wassertechnik GmbH
Low-level C++ development for a data logger including a graphical UI for operation and data visualisation.
- C++
- Embedded
- GUI
- 01/2023 – presentcurrent
Freelance Engineer · Selbständige Beratung & Softwareentwicklung
Controlling software for wine export, open-source contributions to NocoDB, data-process migration from Windows to Linux including a PHP applet.
- Python
- Linux
- PHP
- NocoDB
// Stack
My daily toolkit.
A pragmatic selection — the list focuses on technologies in production use, not everything I've ever evaluated.
- // System & Shell
- zsh / bash · tmux · VS Code · Git
- // Development
- Python · TypeScript · SQL · Vue / Nuxt 4 · FastAPI
- // Agents & LLM-Ops
- Claude Code · LiteLLM · MCP · Hermes · OpenHands · Letta
- // Ops & Infrastructure
- Kubernetes (K3s) · Helm · ArgoCD · Istio · Terraform · Git Actions
- // Data & Storage
- PostgreSQL · S3
- // daily (compute)
- Hetzner
- // daily (edge/cdn)
- Cloudflare · Gcore
Zero-Trust · GitOps / IaC · Data Lake / Lakehouse · Edge AI / On-Device-Inferenz · MLOps · Multi-Agent / MCP
- // languages
- Java · R · C# / .NET · C++
- // data engineering
- Snowflake · Airflow · dbt · Kafka · Spark · Trino · Oracle
- // managed platforms
- AWS · GCP · Azure · IONOS
// References
Excerpts from work certificates.
Original quotes from the certificates of my previous full-time engagement. Full documents available on request.
Mr Geist consistently performed his duties to our complete satisfaction — with high self-motivation, above-average output and particularly deep technical knowledge. He was indispensable to our team.
Outstanding ability to grasp new topics, comprehensive expertise, independent and meticulous execution — the collaboration was excellent throughout.
Open for conversations// Contact
Say hello.
Reach me by email or connect directly — I usually reply within a business day.