Hannes Witt - Freelance Developer

Recommended expert

Leipzig, Germany

Experience

Apr 2022 - Jun 2025

3 years 3 months

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Rule-based software for managing, planning and delivering marketing materials in the pharmaceutical industry
High performance, high availability
Fullstack, DevOps (CI/CD)
Python, PostgreSQL, Vue.js, TypeScript, Docker, Docker Compose, Nginx
Successfully migrated 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 interface connections & 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 switchgear 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 development of further products that reuse the existing configuration engine in a web-based application

Feb 2018 - Jan 2020

2 years

Leipzig, Germany

Built and further developed a high-performance, high-availability platform for image recognition AI as a SaaS product
AI platform based on TensorFlow/Keras
Microservice architecture in Kubernetes
Founded, led & 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
Liquidated due to lack of product-market fit

Aug 2017 - Apr 2018

9 months

Leipzig, Germany

Contributed to an existing configuration engine for electrical switchgear, software maintenance, debugging, 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 in various industries (automotive, media, finance, insurance, e-commerce, B2B & B2C, health, transportation)