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’s performance earned our fullest recognition at all times and in every respect. Particularly noteworthy are his high trustworthiness, his independence, his assertiveness and his very strong planning and organisational skills.
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.