I'm Jens Mayer, a Backend Software Engineer based in Mannheim, Germany. I have hands-on experience in Python, FastAPI, SQL, and API design, building 3+ backend applications with attention to clean code, testing, and scalable architecture. I'm currently expanding into Flutter (Dart) and Cloud Engineering (AWS), and I'm open to backend, Flutter, or hybrid roles that leverage my problem-solving and collaboration skills. I am comfortable taking ownership of end-to-end backend work, designing robust data models, and implementing RESTful APIs. I enjoy learning new technologies and applying best practices to deliver maintainable, scalable software.…

Jens Mayer

I'm Jens Mayer, a Backend Software Engineer based in Mannheim, Germany. I have hands-on experience in Python, FastAPI, SQL, and API design, building 3+ backend applications with attention to clean code, testing, and scalable architecture. I'm currently expanding into Flutter (Dart) and Cloud Engineering (AWS), and I'm open to backend, Flutter, or hybrid roles that leverage my problem-solving and collaboration skills. I am comfortable taking ownership of end-to-end backend work, designing robust data models, and implementing RESTful APIs. I enjoy learning new technologies and applying best practices to deliver maintainable, scalable software.…

Available to hire

I’m Jens Mayer, a Backend Software Engineer based in Mannheim, Germany. I have hands-on experience in Python, FastAPI, SQL, and API design, building 3+ backend applications with attention to clean code, testing, and scalable architecture. I’m currently expanding into Flutter (Dart) and Cloud Engineering (AWS), and I’m open to backend, Flutter, or hybrid roles that leverage my problem-solving and collaboration skills.

I am comfortable taking ownership of end-to-end backend work, designing robust data models, and implementing RESTful APIs. I enjoy learning new technologies and applying best practices to deliver maintainable, scalable software.

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Skills

Experience Level

Python
Expert
SQL
Expert
PostgreSQL
Intermediate
Github
Intermediate
SQLite
Intermediate
Docker
Intermediate
Dart
Beginner
Flutter
Beginner
AWS
Beginner
CSS
Beginner
JavaScript
Beginner
Kubernetes
Beginner
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Language

German
Fluent
English
Intermediate

Work Experience

Catering & Service Assistant at Region Catering & Service Partner GmbH
March 1, 2009 - January 31, 2011
Provided catering and service support in Mannheim; contributed to smooth service operations and customer satisfaction in a fast-paced food service environment.
Construction Worker (Self-Employed) at Self-Employed
February 1, 2011 - January 31, 2015
Carried out miscellaneous construction tasks, site preparation, and hands-on collaboration with teams on projects requiring practical problem-solving.
Laboratory Assistant at German Cancer Research Center (DKFZ)
February 1, 2015 - February 29, 2016
Supported laboratory operations in a regulated research environment, contributing to data collection and workflow efficiency.
Volunteer Social Year (FSJ) at Mannheim
August 1, 2006 - February 28, 2007
Completed a social service year providing community support and organizational assistance.

Education

Medical Laboratory Technician (MTA) with Nursing Internship at University Medical Center Mannheim (UMM)
October 1, 2013 - September 30, 2014
Vocational IT Training at BFW Würzburg
August 2, 2022 - March 2, 2024
Backend Development Certification (in progress) at Masterschool
March 1, 2025 - January 26, 2026

Qualifications

Backend Development Certification
March 1, 2025 - January 26, 2026

Industry Experience

Software & Internet, Healthcare, Education, Life Sciences, Professional Services
    paper Mythic-Access-DnD-API

    • Developed an accessible tabletop-RPG campaign management API using FastAPI, PostgreSQL, and SQLModel, supporting full CRUD workflows for users, campaigns, characters, dice sets, and roll logs.

    • Designed a modular, scalable architecture (routes/services/repositories), implemented JWT authentication, and optimized relational models, reducing code complexity by ~35% through refactoring.

    • Achieved 30–50% unit-test coverage and integrated CI/CD with GitHub Actions, ensuring automated testing on every commit and increasing development reliability by over 40%.

    → GitHub: https://www.twine.net/signin