Hannes Witt-Freelance Developer
Check rate
Experience
intermedix GmbH / CGM Deutschland AG
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
Freelance Developer
AstraZeneca
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
Development Project Manager / Backend Developer
Siemens AG
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
Managing Director / CTO
d25.io GmbH
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
Software Architect
Stoneball GmbH
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
Software Developer / QA Lead / Project Manager
APPSfactory GmbH
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)
Industry experience
See where this freelancer has spent most of their professional time.
Experienced in Information Technology, Pharmaceutical, Manufacturing, and Energy.
Business area experience
See which departments and functions this freelancer has contributed to most.
Experienced in Information Technology, Project Management, Product Development, and Quality Assurance.
Skills
Application & Data
- Python, Flask, Java Se
- Javascript, Typescript, Vue.Js
- Redis, Postgresql, Apache Cassandra
- Rest Web Services, Api Design
Devops
- Git, Gitlab, Gitlab Ci, Jenkins
- Docker, Docker Compose, Kubernetes
- Pycharm, Visual Studio Code
- Postman
- Aws S3
Miscellaneous
- Database Model Design
- Jira, Confluence, Youtrack
- Fiddler, Soap-Ui
Watchlist
- Tensorflow, Keras
- Node.Js
- Prometheus
- Teterraform, Ansible, Iac
Languages
Education
Otto-von-Guericke Universität Magdeburg
Diplom-Ingenieur, Computer Visualization · Computer Visualization · Magdeburg, Germany
Certifications & licenses
Statistics
Experience
Global experience
Expertise
Qualifications
Profile
Frequently asked questions
Have questions? Find more information here.
Hannes is based in Leipzig, Germany and can operate in on-site, hybrid, and remote work models.
Hannes speaks the following languages: German (Native), English (Advanced).
Hannes has at least 13 years of experience. During this time, Hannes has worked in at least 5 different roles and for 6 different companies. The average length of individual experience is 2 years and 1 month. Note that Hannes may not have shared all experience and actually has more experience.
Based on recent experience, Hannes would be well-suited for roles such as: Freelance Developer, Development Project Manager / Backend Developer, Managing Director / CTO.
In recent years, Hannes has worked for intermedix GmbH / CGM Deutschland AG and AstraZeneca.
Hannes is most experienced in industries like Information Technology, Pharmaceutical, and Manufacturing. Hannes also has some experience in Energy.
Hannes is most experienced in business areas like Information Technology, Project Management, and Product Development. Hannes also has some experience in Quality Assurance.
Hannes has recently worked in industries like Pharmaceutical.
Hannes has recently worked in business areas like Information Technology and Product Development.
Hannes holds a Bachelor in Computer Visualization from Otto-von-Guericke Universität Magdeburg.
Hannes has 2 certificates. These include: Itemo Professional Scrum Master and Istqb Certified Tester Foundation Level.
The availability of Hannes needs to be confirmed.
Daily rate distribution
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Average rates for similar positions
Rates are based on recent contracts and do not include FRATCH margin.
The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.
The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.
Calculated based on our freelancers’ daily rates as of 28 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.
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