Hannes Witt - Freelance Developer

Q: Where is Hannes based?

Hannes is based in Leipzig, Germany and can operate in on-site , hybrid , and remote work models.

Q: What languages does Hannes speak?

Hannes speaks the following languages: German (Native), English (Advanced) .

Q: How many years of experience does Hannes have?

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.

Q: What companies has Hannes worked for in recent years?

In recent years, Hannes has worked for intermedix GmbH / CGM Deutschland AG and AstraZeneca .

Q: Which industries is Hannes most experienced in?

Hannes is most experienced in industries like Information Technology (IT) , Pharmaceutical , and Manufacturing . Hannes also has some experience in Energy .

Q: Which business areas is Hannes most experienced in?

Hannes is most experienced in business areas like Information Technology (IT) , Project Management , and Product Development . Hannes also has some experience in Quality Assurance (QA) .

Q: Which industries has Hannes worked in recently?

Hannes has recently worked in industries like Pharmaceutical .

Q: Which business areas has Hannes worked in recently?

Hannes has recently worked in business areas like Information Technology (IT) and Product Development .

Q: What is Hannes's education?

Hannes holds a Bachelor in Computer Visualization from Otto-von-Guericke Universität Magdeburg .

Recommended expert

Leipzig, Germany

Experience

Apr 2022 - Jun 2025

3 years 3 months

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

Feb 2020 - Feb 2022

2 years 1 month

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

Aug 2018 - Oct 2019

1 year 3 months

Leipzig, Germany

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

Feb 2018 - Jan 2020

2 years

Leipzig, Germany

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

Aug 2017 - Apr 2018

9 months

Leipzig, Germany

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

Aug 2012 - Aug 2017

5 years 1 month

Leipzig, Germany

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)

Industries Experience

See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.

Experienced in Information Technology (7 years), Pharmaceutical (5 years), Manufacturing (2 years), and Energy (1 year).

Information Technology

Pharmaceutical

Manufacturing

Energy

Business Areas Experience

The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.

Experienced in Information Technology (12.5 years), Project Management (6 years), Product Development (5.5 years), and Quality Assurance (5 years).

Information Technology

Project Management

Product Development

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

German

Native

English

Advanced

Education

Oct 2007 - Jun 2012

Otto-von-Guericke Universität Magdeburg

Diplom-Ingenieur, Computer Visualization · Computer Visualization · Magdeburg, Germany

Certifications & licenses

Itemo Professional Scrum Master

Istqb Certified Tester Foundation Level

Profile

Created

September 2025

Last Update

September 2025

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Frequently asked questions

Do you have questions? Here you can find further information.

Where is Hannes based?

Hannes is based in Leipzig, Germany and can operate in on-site, hybrid, and remote work models.

What languages does Hannes speak?

Hannes speaks the following languages: German (Native), English (Advanced).

How many years of experience does Hannes have?

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.

What roles would Hannes be best suited for?

Based on recent experience, Hannes would be well-suited for roles such as: Freelance Developer, Development Project Manager / Backend Developer, Managing Director / CTO.

What companies has Hannes worked for in recent years?

In recent years, Hannes has worked for intermedix GmbH / CGM Deutschland AG and AstraZeneca.

Which industries is Hannes most experienced in?

Hannes is most experienced in industries like Information Technology (IT), Pharmaceutical, and Manufacturing. Hannes also has some experience in Energy.

Which business areas is Hannes most experienced in?

Hannes is most experienced in business areas like Information Technology (IT), Project Management, and Product Development. Hannes also has some experience in Quality Assurance (QA).

Which industries has Hannes worked in recently?

Hannes has recently worked in industries like Pharmaceutical.

Which business areas has Hannes worked in recently?

Hannes has recently worked in business areas like Information Technology (IT) and Product Development.

What is Hannes's education?

Hannes holds a Bachelor in Computer Visualization from Otto-von-Guericke Universität Magdeburg.

Does Hannes have any certificates?

Hannes has 2 certificates. These include: Itemo Professional Scrum Master and Istqb Certified Tester Foundation Level.

What is the availability of Hannes?

Hannes is immediately available full-time for suitable projects.

What is the rate of Hannes?

Hannes's rate depends on the specific project requirements. Please use the Meet button on the profile to schedule a meeting and discuss the details.