import React from 'react' import { Helmet } from 'react-helmet' import Layout from '../components/layout' import avatar from '../assets/images/avatar.jpg' const SITE_TITLE = 'Dennis Thiessen · Data, Analytics & AI Engineer' const SITE_DESCRIPTION = 'Dennis Thiessen is a Staff Data, Analytics & AI Engineer in Bern, Switzerland, building the data pipelines and ML infrastructure that production systems run on.' const EMAIL = 'dennis@thiessen.io' const LINKEDIN = 'https://www.linkedin.com/in/dennis-thiessen' // Career as a pipeline, most recent first. Each node is a role. const ROLES = [ { year: '2023 – PRESENT', company: 'Swisscom', location: 'Bern, CH', title: 'Staff Data, Analytics & AI Engineer', description: 'ETL and streaming pipelines in Python, Kafka and SAP BODS feeding a Teradata warehouse, while migrating the legacy stack onto AWS (Glue, Redshift, Lambda, Step Functions, Airflow).', live: true, }, { year: '2020 – 2023', company: 'Bosch Semiconductor', location: 'Dresden, DE', title: 'Senior Data Engineer', description: 'Containerised ML inference (Docker, Kubernetes, Ansible) into 24/7 semiconductor production lines, and built Python, Java and C# data services over Oracle and Hadoop/Impala.', }, { year: '2018 – 2020', company: 'Fraunhofer CML', location: 'Hamburg, DE', title: 'Research Software Engineer', description: 'Optimisation-based crew-scheduling decision support in C#/.NET, plus research microservices and a Jenkins CI/CD pipeline with quality gates.', }, { year: '2017 – 2018', company: 'Vizrt', location: 'Bergen, NO', title: 'DevOps Engineer', description: 'A distributed video-transcoding backend in Python and C++, with automated audio/video integration testing for reliable releases.', }, { year: '2015 – 2017', company: 'Generali', location: 'Hamburg, DE', title: 'Software Engineer & IT Consultant', description: 'A Java/J2EE workflow portal on Oracle, and introduced behaviour-driven development and RPA automation (UiPath, Camunda).', }, ] const STACK = [ { label: 'Languages', items: ['Python', 'SQL', 'Java', 'C#', 'TypeScript', 'C++'] }, { label: 'Data & Pipelines', items: ['ETL / ELT', 'Kafka', 'Airflow', 'SAP BODS', 'Teradata', 'Hadoop / Impala'] }, { label: 'Cloud & Infra', items: ['AWS', 'Docker', 'Kubernetes', 'Ansible', 'CI/CD'] }, { label: 'ML & Observability', items: ['PyTorch', 'scikit-learn', 'ELK', 'Grafana', 'Prometheus'] }, { label: 'Credentials', items: ['M.Eng., UniBw München', 'AWS Solutions Architect – Associate', 'iSAQB CPSA-F'] }, ] const Tags = ({ items }) => items.map((item, i) => ( {i > 0 && ' · '} {item} )) const IndexPage = () => ( {SITE_TITLE}
Dennis Thiessen

Data · Analytics · AI Engineering

Dennis Thiessen

I build the pipelines and platforms that move data and run models in production.

Staff Data, Analytics & AI Engineer at Swisscom, based in Bern, Switzerland, with 8+ years across data engineering, ML infrastructure and DevOps.

Dennis Thiessen

Profile

I work where software engineering meets operations. I design ETL/ELT and streaming pipelines, containerise ML inference, and turn monolithic data processes into event-driven, serverless systems.

Right now I'm at Swisscom in Bern, moving a legacy Teradata and Oracle stack onto AWS. What I care about most is automation and reliability: systems that run themselves, recover on their own, and don't page anyone at 3 a.m.

Experience

    {ROLES.map((role) => (

  1. {role.year}

    {role.company}

    {role.location}

    {role.title}

    {role.description}

    2. ))}

Stack

{STACK.map((group) => (

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Contact

Open to interesting problems in data, ML and platform engineering, in Switzerland or remote. Email is the fastest way to reach me.

{EMAIL}
LinkedIn ↗ {/* Add a GitHub profile URL here when you have one you want public. */}
) export default IndexPage