Tobias J. - Contract assignment: MVP S3-based data lake implementation

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Potsdam, Germany

Experience

Nov 2024 - Sep 2025

11 months

Contract assignment: MVP S3-based data lake implementation

German Research Centre for Geosciences (GFZ), Helmholtz Association

Project planning and organization
Design of the software architecture
Evaluation of software libraries to be used
Integration of S3 storage, Apache Airflow for process orchestration, and STAC catalogs for data cataloging
Identity provider integration with Keycloak
Automated testing with Pytest and Playwright
SSO integration with OAuth2/OpenID Connect
Reverse proxy configuration with Nginx

Jul 2024 - Oct 2024

4 months

External contractor: Proof of Concept for an S3 cloud storage-based data lake infrastructure

German Research Centre for Geosciences GFZ

Project planning and organization
Design of the software architecture
Evaluation of software libraries to be used
PoC implementation based on MinIO S3 storage, Apache Airflow for process orchestration, and STAC catalogs for data cataloging

Oct 2022 - Nov 2024

2 years 2 months

Contract assignment: Automated race number recognition for motorcycle races

Christian Engelhardt Software Development

Labeled data for detecting motorcycle race numbers and OCR recognition of numbers
Training YOLO models for precise detection of number fields
Fine-tuning OCR models for accurate number extraction
Developing an end-to-end inference pipeline that combines detection and OCR
Benchmarking the models for CPU-only use cases
Integration into a .NET application with C# (Windows)

Jan 2022 - Dec 2024

3 years

External contractor: Development of a web-based PWA for visual inspection of cocoa beans

QVISIONS Ltd.

Object detection with YOLOv4 (Darknet)
Semantic segmentation with Detectron
Image classification with TensorFlow/Keras
Containerization with Docker, Docker Compose, and Kaniko
Designing and implementing versioned data pipelines with DVC
Automated experiment tracking with MLflow
Setting up CI pipelines in GitLab using Docker containers
Implementing the backend and frontend for the progressive web app
Camera control via edge devices and planning/design of a photo box

Aug 2021 - Jan 2025

3 years 6 months

External contractor: Quality assurance for a web portal

Federal Printing Office Ltd.

Acceptance testing in Jira/XRay
API testing with Swagger/Postman
E2E testing with Playwright/Mocha in TypeScript
Load testing with Gatling
Conducting code reviews
Setting up CI pipelines in GitLab
Checking data consistency in Elasticsearch and Minlo
Test automation within a Docker environment using Docker Compose
Inspecting Kubernetes container infrastructure with K9s and Rancher

Apr 2020 - Dec 2020

9 months

External consultant: converting a complex mathematical model into a high-performance computer algorithm

TRAINALYZED GmbH

Frontend development with JavaScript, Bootstrap, HTML, and CSS
Backend development with Python and Django
Translating the mathematical model into a software simulation using Python, NumPy, Pandas, Jupyter Notebook, SciPy, and Sympy
Research into mathematical solution and optimization methods
Algorithm design and adaptation of existing solution methods
Integration of proof-of-concept implementations into the simulation architecture
Dependency and sensitivity analyses to explore the parameter space
Visualization of computed results with Matplotlib and Bokeh
Providing routines to read problem-specific files (fitparse, Cheetah)
Reducing computation times through parallelization and code optimization with the Numba JIT compiler and multiprocessing

Jul 2018 - Apr 2020

1 year 10 months

Developing a software architecture to control a 7-axis robotic gripper

IAV GmbH

Architecture design of a decentralized, asynchronously communicating module system in ROS
Programming motion sequences with ROS MoveIt!
Developing collision avoidance algorithms in Python
Commissioning and control of the research robot and calibration of camera systems
Enhancing and optimizing object detection using 3D point clouds in OpenCV and PCL
Feature mapping with PCL
Experiments with TensorFlow for hand pose detection
Setting up a containerized development infrastructure with Docker
Optimizing the graphical user interface in C++/Qt for controlling the computer vision system

Apr 2018 - Mar 2020

2 years

Developing a multi-user, offline-capable Progressive Web App (PWA) for training and nutrition planning

TRAINALYZED GmbH

Designing a visual concept
Implementing a progressive web app for mobile and desktop devices in Angular
Building a server backend in Django (Python), MongoDB, and PostgreSQL
Providing REST services for communication with the PWA
Offline functionality with Service Worker (Workbox) and custom caching strategies
User authentication and authorization
Reading and processing fitness files
Securing personal health data
Integrating the Dropbox API for automatic sync via webhooks
Asynchronous task processing with Celery and Redis
Integrating server-generated plots with Bokeh
SSL certificates with certbot and administration of client servers (setup, hardening, backups) on Linux
Quality assurance with Python Unittest and GitLab CI

Oct 2017 - Nov 2021

4 years 2 months

External consultant: redesign and automation of internal knowledge management

IAV GmbH

Setting up the project structure including package managers (Anaconda, npm)
Developing command-line tools with Python
Customizing the client's SharePoint and integrating own components into the multi-user environment
Implementing software tools to automate SharePoint and Nintex
Designing and developing a drag-and-drop editor for custom page layouts in HTML, CSS (Bootstrap), TypeScript, and Gridstack.js
Integrating and developing SOAP and REST services
Reading files in Excel format
Quality assurance with Python unittests

Sep 2016 - Present

9 years 1 month

Software developer

PERFACCT GmbH

Full-stack web development
Data engineering/MLOps
Machine learning / computer vision
Application optimization
Mathematical modeling and optimization

Oct 2014 - Jun 2016

1 year 9 months

Research Assistant

Fraunhofer Heinrich Hertz Institute HHI

Parallelization of an LTE processing chain for the physical layer using OpenMP/OpenACC on digital signal processors
Research into methods of mathematical optimization and declarative programming for resource planning in cellular LTE networks

Oct 2012 - Sep 2014

2 years

Student Assistant

University of Potsdam

Implementation of transpiler programs in Bison/C++ for the Clingo solver
Extension of Clingo-based software tools

Development in the field of computer vision / AI for a wound detection program

BFI Software GmbH

Detection of the reference marker (ChArUco board and ColorChecker) with OpenCV in Python
Implementation of a REST web service in Flask and Gunicorn
Evaluation of camera calibration on mobile devices
Implementation of a web service for photo quality assessment
Evaluation of a neural network (TensorFlow & Keras) for wound segmentation
Containerization with Docker, Docker-Compose, and Kaniko
Design and implementation of versioned data pipelines with DVC
Automated experiment tracking with MLFlow
Setup of CI pipelines in GitLab based on Docker containers

Summary

Clients appreciate my clear and goal-oriented communication. I demonstrated this as a project manager with staff responsibility and also as part of a Scrum team. I link knowledge from different areas of software development very efficiently to address new problems.

As a software engineer, I contribute in all areas of development, from requirements analysis, architecture design, and testing to coding. I always place great emphasis on the reproducibility and traceability of results.

My main area of interest is developing data-driven applications that use innovative algorithms to automate and digitize manual processes.