Semjon Geist
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Cloud Platform & Data Engineer · Karlsruhe

SemjonGeist.

I build data platforms, cloud infrastructure and, more recently, edge AI at ChronoLite. Calm architecture, robust pipelines, honest consulting.

Get in touch See my work
  • Cloud engineering
  • Data engineering
  • AI & LLM-Ops
  • Software Engineering

// About

Data platforms, cloud and edge AI — held together by clean engineering practice.

At heart a data engineer — with strong cloud, infrastructure and ops practice on a solid software-engineering foundation from my degree and broad development experience. The path led from building scalable data platforms to co-founding an edge-AI startup.

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.

  1. 04/2026 – 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.

    • Owns the technical platform architecture and product development.
    • Frontend and integration of the ML-Ops platform — bringing model registry, training manager, evaluation and annotation together in one cohesive UI.
    • 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
  2. 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
  3. 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
  4. 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 Strato among others.
    • Airflow architecture, dynamic DAGs, custom plugins, rollout processes.
    • Data-lake / lakehouse driver: Trino + Superset architecture, Delta evaluation, Kafka Connect (CDC).
    • Python
    • Java
    • R
    • PostgreSQL
    • Kafka
    • Trino
    • Airflow
    • Pentaho
    • Kubernetes
    • GitLab CI/CD
    • Helm
    • Docker
  5. since 02/2021Side engagement

    Embedded data logger & reporting · Hamman Theurer Wassertechnik GmbH

    Python development for a data logger including a graphical UI for operation and data visualisation, plus reporting software for analysing and interactively visualising the measurement campaigns.

    • Python
    • Tauri / Nuxt
    • ECharts
    • GUI
  6. since 01/2023Project-based

    Freelance Engineer · Selbständige Beratung & Softwareentwicklung

    Recurring, project-based engagements with mid-market clients (export sales / wine trade). Focus: data integration, legacy modernisation, and BI/forecasting around an ERP migration.

    • ERP migration to Microsoft Dynamics 365 Business Central, including external DWH/ETL processes for consolidated reporting.
    • Forecasting PoC for sales predictions: statistical models vs. the internal plan forecast across several aggregation levels.
    • Modernising the data-process infrastructure: Windows → Linux, replacing a legacy PHP applet, new automation pipelines.
    • Python
    • SQL
    • Linux
    • Business Central
    • Airflow
    • MariaDB
    • NocoDB
    • PHP
  7. 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

// 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
// concepts & architecture

Zero-Trust · GitOps / IaC · Data Lake / Lakehouse · Edge AI / On-Device-Inferenz · MLOps · Multi-Agent / MCP

// also experienced with
// languages
Java · R · C# / .NET · C++
// data engineering
Snowflake · Airflow · dbt · Kafka · Spark · Trino · Oracle
// managed platforms
AWS · GCP · Azure · IONOS · STACKIT

// References

Excerpts from work certificates.

Original quotes from the certificates of my previous full-time engagements. 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.

Benedikt Bonnmann & Didem BuchholzFinal certificate, adesso SE · adesso SE

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.

Teamleitung Data FactoryFinal certificate, IONOS SE · IONOS SE

Outstanding ability to grasp new topics, comprehensive expertise, independent and meticulous execution — the collaboration was excellent throughout.

Teamleitung Data FactoryInterim certificate, IONOS SE · IONOS SE
Portrait of Semjon GeistOpen for conversations

// Contact

Say hello.

Reach me by email or connect directly — I usually reply within a business day.

Email[email protected]LocationKarlsruheLinkedInlinkedin.com/in/semjon-geistb58703175GitHubgithub.com/GentleGhostCoderMore about me off the keyboardGymnastics, marathon, bikepacking, climbing — the other third.