Profile
Alexej Liebenthal
Senior Software Engineer
I'm a Senior Software Engineer with over a decade of experience, starting in the Air Force where I developed geographical information systems at Airbus in high-security environments. Today, I build cloud-native insurance platforms, leading multi-tenant solutions integrated with Sparkassen App (S-App) across major German public insurers. As GitHub Service Owner, I drive platform adoption across teams. I'm passionate about clean code, developer experience, mentoring fellow developers, and occasionally sharing insights at tech conferences.
Skills
Core Languages
- JavaScript
- TypeScript
- Python
- Java
- C#
- Ruby
- Bash
Frontend Technologies
- HTML
- CSS
- Tailwind
- React
- Next.js
- Astro
- WPF
Backend & Frameworks
- NodeJS
- .NET
- JavaEE
- MicroProfile
- Ruby on Rails
Cloud & Infrastructure
- AWS
- Kubernetes
- OpenShift
- Docker
- PostgreSQL
- Kafka
- NATS
- Linux
Development Tools
- Git
- GitHub
- GitHub Actions
- Jenkins
- VS Code
- JetBrains IDEs
- Jira
- Confluence
Professional Skills
- Software Architecture
- CI/CD
- Clean Code
- Code Reviews
- Automated Testing
- Agile
- Scrum
- Technical Documentation
- Mentoring
Projects
Active maintainer of the website.
Delivered a technical talk at MD-DevDays'24 conference showcasing modern React development tools and best practices.
Developed a real-time event timeline for JetBrains online conference.
Conference Schedule
Web ApplicationBuilt an interactive conference schedule application used by attendees at MD-DevDays'24 for their personal agenda planning.
Experience
Senior Software Engineer
Versicherungskammer Bayern
Building AWS-hosted platforms for Germany's public insurance sector. Serving as GitHub Service Owner, establishing GitHub as an enterprise platform and ensuring C5 compliance.
Senior Software Engineer
Inverso (subsidiary of Versicherungskammer Bayern)
Leading development of a Personal Insurance Management Platform (React/Ruby on Rails) with insurer back office and S-App integration for Sparkassen customers and advisors, as well as an Upsale Marketing App (Next.js)
- Architected complex insurance product comparisons and specialist appointment booking system handling multi-tenant relationships between Sparkassen, insurers, and agencies
- Migrated large-scale React application (100k+ LOC) to Vite, reducing startup times from ~1 minute to under a second
- Modernized development workflow: GitHub Actions CI/CD with AWS deployments, ESLint standardization, Tailwind CSS consolidation
- Stabilized marketing platform codebase and improved deployment processes after taking over from agency
- Mentored junior developers and guided career changers in maintaining high code quality standards
Senior Software Engineer
Versicherungskammer Bayern
Early-stage insurance policy management framework (Java EE) deployed on OpenShift
- Identified maintainability and scalability challenges early in the project lifecycle
- Maintained professional engagement while seeking more impactful opportunities
German Air Force Officer & Software Engineer
Federal Ministry of Defence
Officer in the German Air Force since 2010, transitioned to Software Engineering role in 2015.
Senior Software Engineer
Airbus Defence and Space (civil-military cooperation)
- Designing, developing, and maintaining several geographic information system projects (.NET/C#/WPF) for pilots and intelligence service
- Successfully delivering the software to the customers and training them to use the new features
- Conducting workshops with the customers to identify their requirements and issues
Software Engineer
Federal Ministry of Defence
- Rotation program with dedicated training in leadership, logistics, and law
- Maintaining a legacy .NET FX 1.1 VB.NET WinForms Application, and porting it from Windows XP to Windows 7
Student Officer
Federal Ministry of Defence
- Academic education in Mathematical Engineering
- Military training as participant and instructor
Officer Candidate
Federal Ministry of Defence
Basic military and officer training
Senior Software Engineer
Versicherungskammer Bayern
Leading full-stack engineer developing cloud-native insurance platforms on AWS, focusing on React and Ruby on Rails applications. Established GitHub as enterprise platform while ensuring security compliance.
- Led development of multi-tenant insurance platform integrated with Sparkassen App (S-App), serving major public insurers
- Architected complex insurance product comparisons and specialist appointment booking system
- Migrated large-scale React application (100k+ LOC) to Vite, reducing startup times from ~1 minute to under a second
- Modernized development workflow through GitHub Actions CI/CD implementation and AWS deployments
- Led enterprise-wide migration from AWS CodeCommit to GitHub, including security compliance implementation
- Established coding standards through ESLint integration and Tailwind CSS consolidation
- Stabilized Next.js marketing platform codebase and improved AWS deployment processes
- Mentored junior developers and guided career changers in maintaining high code quality standards
- Designed and implemented an insurance policy management framework with Java EE deployed on OpenShift
German Air Force Officer & Software Engineer
Federal Ministry of Defence
Software Engineer in civil-military cooperation with Airbus Defence and Space, developing mission-critical geographic information systems for military aviation. Career started as Air Force Officer in 2010. Transitioned to Software Engineering role in 2015.
- Designed and developed geographic information system projects (.NET/C#/WPF) for pilots and intelligence service
- Led software delivery and training programs for military personnel
- Conducted requirements gathering workshops with military stakeholders
- Maintained and modernized mission-critical legacy applications
- Successfully ported Windows XP applications to Windows 7 environment
- Combined military leadership with software engineering expertise
- Completed comprehensive military officer training
- Earned Mathematical Engineering degree while serving
Internships
Research Operations Intern
HypoVereinsbank - UniCredit Bank AG
Performing quantitative data analysis using Microsoft Excel, VBA and C#
BMW ConnectedDrive Intern
BMW AG
Developing a desktop client application to easily edit and correct POI map data
Education
Postgraduate Studies
Computer Science at Technical University Munich
Master of Science
Mathematical Engineering at Bundeswehr University Munich
Bachelor of Science
Mathematical Engineering at Bundeswehr University Munich
Languages
- German Native
- English Fluent
- Ukrainian Basic
- Russian Basic
- Spanish Basic
Interests
- Open Source Contributing
- Software Architecture
- Public Speaking
- Skiing
- Traveling
- Movies
- Volunteering