Hannes W. - Freelance Developer

Leipzig, Germany

Experience

Apr 2022 - Jun 2025

3 years 3 months

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Rule-based software for managing, planning and delivering promotional materials in the pharmaceutical industry
High performance, high availability
Fullstack, DevOps (CI/CD)
Python, PostgreSQL, Vue.js, Typescript, Docker, Docker-Compose, Nginx
Successfully transformed old Excel-based processes into an optimized product that has been in production since 2024

Feb 2020 - Feb 2022

2 years 1 month

Extensive multi-domain platform
Backend for integrating patient and doctor platforms including content management, external interfaces & login functionality
Implementation of individual components in the frontend
CI/CD with GitLab & Docker, rollout with Docker-Compose & Nginx
Python, Flask, Redis, PostgreSQL, Cockpit CMS, Minio, GitLab CI, Docker, Docker-Compose, Nginx, API development, RESTful web services, data model design, Vue.js, TypeScript, Node.js
Developed a user-centered CMS with custom features that manages at least 30 different websites and is in use as of 2025

Aug 2018 - Oct 2019

1 year 3 months

Leipzig, Germany

Extended an existing configuration engine for electrical control systems with a RESTful API as an internal proof of concept for a cloud-based SaaS solution
Designed and developed the RESTful API, led the team
Java SE, Eclipse RCP, Amazon S3, RESTful web services, API design
Successful proof of concept led to the development of additional products that reuse the existing configuration engine in a web-based application.

Feb 2018 - Jan 2020

2 years

Leipzig, Germany

Built and enhanced a high-performance, high-availability platform for image recognition AI as a SaaS product
AI platform based on TensorFlow/Keras
Microservice architecture in Kubernetes
Established, led, and organized the development department
Python, Flask, Redis, PostgreSQL, Cassandra, Docker, Docker-Compose, Kubernetes, GitLab CI, API development, RESTful web services, platform & data model design, Vue.js, TypeScript
Platform for analyzing and tagging 400,000 images per minute
Liquidation due to lack of product-market fit

Aug 2017 - Apr 2018

9 months

Leipzig, Germany

Worked on an existing configuration engine for electrical control systems, software maintenance, bug fixing, feature implementation
Java SE, Eclipse RCP, SAP API, API design
Spin-off with follow-up project

Aug 2012 - Aug 2017

5 years 1 month

Leipzig, Germany

Java, Android SDK, SQLite, Fiddler, JavaScript
Around 30 successful mobile app projects across various industries (automotive, media, finance, insurance, e-commerce, B2B & B2C, health, transportation)