Seasoned Java Senior Software Engineer/Architekt/hands-on CTO with a focus on architecting/implementing microservice and distributed architectures.
Aktualisiert am 13.05.2025
Profil
Freiberufler / Selbstständiger
Remote-Arbeit
Verfügbar ab: 02.05.2025
Verfügbar zu: 100%
davon vor Ort: 0%
Software Engineering
Software Architecture
Java
AWS Solution Architect
Spring Boot
Spring
Microservices
Docker
Kubernetes
OpenShift
REST
Kafka
CI/CD
Agile Mindset
DevOps
Jenkins
Grafana
IntelliJ
.NET
Deutsch
Verhandlungssicher
Englisch
Verhandlungssicher
Spanisch
Grundkenntnisse

Einsatzorte

Einsatzorte

Österreich, Schweiz, Deutschland
möglich

Projekte

Projekte

8 Monate
2024-09 - 2025-04

Java Backend Development

Freelance Senior Software Engineer IntelliJ Java 8/17 Spring Boot/Web Flow/etc. ...
Freelance Senior Software Engineer
· Maintenance and bug-fixing for a legacy back-office application
· Backend development for new features/services
· Developed batch jobs
· Performance analysis of SOAP services
· Refactored/unified application logging

· Wrote unit tests, increased test coverage and code quality


IntelliJ Java 8/17 Spring Boot/Web Flow/etc. JSF JUnit Mockito SOAP REST Maven Oracle Docker Jenkins SonarQube Bitbucket Confluence OpenShift ArgoCD Web Application Sphere Microsoft Teams
e-Government
4 Jahre
2020-07 - 2024-06

Digitalization and innovation consulting in e-Gov project

Freelance senior software engineer/architect IntelliJ Java 8/11 Spring Boot (Spring Web Services ...
Freelance senior software engineer/architect
· Development of Java SOAP service clients and Java microservices (HTTP/REST APIs)
· Frontend development for Angular-based back-office web apps
· Backend development for next-gen IP front-office application (hexagonal architecture)
· Improved unit test coverage and code quality
· Installation/maintenance of a self-hosted Docker host, image registry and Traefik reverse proxy

IntelliJ Java 8/11 Spring Boot (Spring Web Services Security etc.) Python SOAP REST WildFly Elasticsearch Google Maps API Maven Angular 10 TypeScript SQL Server/MariaDB Docker/Swarm Traefik Jenkins SonarQube Keycloak Bitbucket/GitLab Jira Confluence Linux (Ubuntu/CentOS) Microsoft Teams
EU IP Project
Remote
1 Jahr 11 Monate
2018-09 - 2020-07

Microservices Development

Freelance senior software engineer/architect IntelliJ Java 8 JAX-RS ...
Freelance senior software engineer/architect
  • Maintenance and refactoring of legacy Java applications
  • Development of new Java and Kafka based event-driven microservices and HTTP/REST APIs
  • Development, provisioning and maintenance of company-internal Maven libraries
  • Frontend development for new Angular-based securities backoffice web apps
  • Promote and cultivate a collaborative DevOps culture, improve the team’s value delivery
IntelliJ Java 8 JAX-RS in-house frameworks Spring Boot (and its ecosystem) Quarkus Maven Angular 6 Tomcat/Jetty Hibernate SQL Server/DB2 Docker Kafka Prometheus Jenkins Bitbucket/GitLab OpenShift Jira Confluence Microsoft Teams
Erste Bank
1 Jahr 3 Monate
2017-06 - 2018-08

Oversaw the internal IT

CTO/Senior software engineer IntelliJ Java 8 Kotlin ...
CTO/Senior software engineer
  • Oversaw the internal IT, the software development efforts and external contractors
  • Modernized, improved and moved the gaming platform and our game to launch into the cloud
  • Migration of Java EE/JBoss services to Spring Boot/Kotlin/Docker based microservices
  • Implemented a HTTP/REST API for game tournament results
  • Researched and tested (proof of concept) different crypto wallet APIs
  • Integrated Coinbase APIs in our gaming platform to support in-game bitcoin payment transactions
  • Established a DevOps system for CI/CD to the Google Cloud Kubernetes cluster
  • Engineered a cloud-based centralized logging solution based on the ELK stack
IntelliJ Java 8 Kotlin Java EE JUnit JMeter JBoss Spring Boot/Web Maven HTML5 JS Tomcat JOQQ Hibernate PostgreSQL Docker Jenkins Bitbucket Spinnaker Kubernetes Kafka ELK GCP Linux Jira Confluence Microsoft Teams
Mobile gaming startup
5 Jahre 9 Monate
2011-09 - 2017-05

Coached and helped junior developers

Tech lead/Software architect/Release manager TFS Visual Studio C# ...
Tech lead/Software architect/Release manager
  • Tech lead of the web and mobile team
  • Coached and helped junior developers to better understand software engineering best practices
  • Crafted web and mobile based sports betting products
  • Implemented a HTTP/REST WebAPI-based middleware
  • Provided tech guidance and support for external development partners
  • Member of the company’s Architecture Review Board
  • Established a TFS based build system for CI, release builds and deployment
  • Contributed major improvements to the company’s API/WCF services performance and throughput
  • Prototyped a microservices based architecture with .NET Core, Docker and OpenShift (PaaS)
TFS Visual Studio C# ASP.NET MVC/Web API IIS WCF .NET Core Docker Angular HTML5 JS Flash FlexUnit xUnit Moq DotNetNuke MSBuild SQL Server Linux OpenShift SonarQube Git
BGT (sports betting)
5 Monate
2011-04 - 2011-08

Refactored legacy ASP.NET applications

Freelance senior software engineer C# ASP.NET Web Forms WCF ...
Freelance senior software engineer

Refactored legacy ASP.NET applications and Java web applications/services

C# ASP.NET Web Forms WCF EF SQL Server Java JUnit JSP Servlets Tomcat MySQL Git
Semizen (IT solutions)
6 Monate
2010-10 - 2011-03

Implemented game client

Senior software engineer C# Flash AsUnit ...
Senior software engineer
  • Implemented game client and server features and unit tests
  • Participated in the game architecture design
  • Established and managed the CI/CD system and build/release cycles
C# Flash AsUnit APlay Middleware PostgreSQL TeamCity Facebook API Jira Subversion
Cliffhanger Productions (game studio)
11 Monate
2009-11 - 2010-09

Provided mentoring

Freelance .NET architect TFS C# ASP.NET Web Forms ...
Freelance .NET architect
  • Provided mentoring and technical evangelism in .NET
  • Designed and implemented a reference service architecture based on WCF services
  • Extended legacy Java services and applications
TFS C# ASP.NET Web Forms EF WCF SQL Server IIS Java Servlets JSP Tomcat WIX
TraviAustria (travel industry)
2 Jahre 1 Monat
2007-09 - 2009-09

Architected a game management platform

Freelance software architect/Team lead TFS C# ASP.NET Web Forms ...
Freelance software architect/Team lead
  • Architected a game management platform for online multi-player games
  • Integrated several 3rd party APIs (e.g. payment providers)
  • Provided mentoring and coaching for junior developers
TFS C# ASP.NET Web Forms WCF SQL Server DevExpress Subversion CruiseControl.NET
Acubate (gaming startup)
2 Jahre 3 Monate
2005-04 - 2007-06

Development of a custom CMS solution

Freelance senior software engineer TFS C# ASP.NET Web Forms ...
Freelance senior software engineer

Development of a custom CMS solution for the food industry

TFS C# ASP.NET Web Forms Oracle JavaScript
CSD (IT services)
5 Monate
2004-11 - 2005-03

Development of a web-based inflation calculator

Freelance senior software engineer C# ASP.NET Web Forms IIS ...
Freelance senior software engineer
C# ASP.NET Web Forms IIS SQL Server Excel
WKO
3 Jahre 6 Monate
2001-05 - 2004-10

Design/Development of Java/.NET based financial solutions

Freelance senior software engineer C# Java Swing ...
Freelance senior software engineer
C# Java Swing Servlets C++ HTML/JS
Wincor Nixdorf (banking services)

Aus- und Weiterbildung

Aus- und Weiterbildung

Position

Position

  • Java Software Engineer
  • Software Architect
  • AWS Solution Architect
  • DevOps Consultant
  • CTO

Kompetenzen

Kompetenzen

Top-Skills

Software Engineering Software Architecture Java AWS Solution Architect Spring Boot Spring Microservices Docker Kubernetes OpenShift REST Kafka CI/CD Agile Mindset DevOps Jenkins Grafana IntelliJ .NET

Produkte / Standards / Erfahrungen / Methoden

Bitbucket/GitLab
Confluence
Confluence/Jira
Docker
Hibernate
HTML5
IntelliJ
JBoss
Jenkins
Jira
JMeter
Kafka
Kubernetes
Maven
Microsoft Teams
OpenShift
Prometheus
Quarkus
Spring Boot (and its ecosystem)
Spring Boot/Web
Tomcat
Tomcat/Jetty

OBJECTIVE
I am a Senior Software Engineer/Architect/Tech Lead with over 25 years of experience in the Banking, Travel, Gaming and Sports Betting industry. I have a big passion for crafting products not just software. My focus aims at solving problems and helping my clients deliver business value to their customers. I look forward to bringing in my whole experience to contribute my part to your company?s projects success and help create cutting-edge solutions for your customers.

KEY SKILLS & ABILITIES
Leadership and Agility

  • Strong team player and inspiring leader and mentor with a ?get things done? attitude
  • Effective communicator with various stakeholders on different levels
  • Assume responsibility, no blame assignment, no finger pointing
  • Big believer in Agile Principles and self-empowered cross-functional teams
  • Scrum/Kanban veteran
  • Avid ambassador and practitioner of Continuous Integration/Delivery and DevOps

Engineering

  • Technology enthusiast with a strong engineering background and a big heart for open source
  • Passionate about Clean Code and Software Engineering best practices (e.g. SOLID, DRY, KISS)
  • Experienced in architecting and implementing microservices architectures based on HTTP/REST APIs and/or message brokers
  • Seasoned veteran in JAVA and .NET full-stack software development
  • Experienced with cloud services and CI/CD pipelines for fast feedback and delivery
  • Big interest in blockchain and distributed ledger technologies

Betriebssysteme

Linux
Fortgeschritten
Windows
Experte

Programmiersprachen

Java
Experte
Java 8
Experte
Kotlin
Basics
Java EE
C#
Fortgeschritten
JavaScript
Basics
TypeScript
Basics
Python
Basics
React
Ich lerne es gerade im Selbststudium.
Angular
Basics

Datenbanken

DB2
MySQL
PostgreSQL
SQL Server
Oracle
MongoDB

Einsatzorte

Einsatzorte

Österreich, Schweiz, Deutschland
möglich

Projekte

Projekte

8 Monate
2024-09 - 2025-04

Java Backend Development

Freelance Senior Software Engineer IntelliJ Java 8/17 Spring Boot/Web Flow/etc. ...
Freelance Senior Software Engineer
· Maintenance and bug-fixing for a legacy back-office application
· Backend development for new features/services
· Developed batch jobs
· Performance analysis of SOAP services
· Refactored/unified application logging

· Wrote unit tests, increased test coverage and code quality


IntelliJ Java 8/17 Spring Boot/Web Flow/etc. JSF JUnit Mockito SOAP REST Maven Oracle Docker Jenkins SonarQube Bitbucket Confluence OpenShift ArgoCD Web Application Sphere Microsoft Teams
e-Government
4 Jahre
2020-07 - 2024-06

Digitalization and innovation consulting in e-Gov project

Freelance senior software engineer/architect IntelliJ Java 8/11 Spring Boot (Spring Web Services ...
Freelance senior software engineer/architect
· Development of Java SOAP service clients and Java microservices (HTTP/REST APIs)
· Frontend development for Angular-based back-office web apps
· Backend development for next-gen IP front-office application (hexagonal architecture)
· Improved unit test coverage and code quality
· Installation/maintenance of a self-hosted Docker host, image registry and Traefik reverse proxy

IntelliJ Java 8/11 Spring Boot (Spring Web Services Security etc.) Python SOAP REST WildFly Elasticsearch Google Maps API Maven Angular 10 TypeScript SQL Server/MariaDB Docker/Swarm Traefik Jenkins SonarQube Keycloak Bitbucket/GitLab Jira Confluence Linux (Ubuntu/CentOS) Microsoft Teams
EU IP Project
Remote
1 Jahr 11 Monate
2018-09 - 2020-07

Microservices Development

Freelance senior software engineer/architect IntelliJ Java 8 JAX-RS ...
Freelance senior software engineer/architect
  • Maintenance and refactoring of legacy Java applications
  • Development of new Java and Kafka based event-driven microservices and HTTP/REST APIs
  • Development, provisioning and maintenance of company-internal Maven libraries
  • Frontend development for new Angular-based securities backoffice web apps
  • Promote and cultivate a collaborative DevOps culture, improve the team’s value delivery
IntelliJ Java 8 JAX-RS in-house frameworks Spring Boot (and its ecosystem) Quarkus Maven Angular 6 Tomcat/Jetty Hibernate SQL Server/DB2 Docker Kafka Prometheus Jenkins Bitbucket/GitLab OpenShift Jira Confluence Microsoft Teams
Erste Bank
1 Jahr 3 Monate
2017-06 - 2018-08

Oversaw the internal IT

CTO/Senior software engineer IntelliJ Java 8 Kotlin ...
CTO/Senior software engineer
  • Oversaw the internal IT, the software development efforts and external contractors
  • Modernized, improved and moved the gaming platform and our game to launch into the cloud
  • Migration of Java EE/JBoss services to Spring Boot/Kotlin/Docker based microservices
  • Implemented a HTTP/REST API for game tournament results
  • Researched and tested (proof of concept) different crypto wallet APIs
  • Integrated Coinbase APIs in our gaming platform to support in-game bitcoin payment transactions
  • Established a DevOps system for CI/CD to the Google Cloud Kubernetes cluster
  • Engineered a cloud-based centralized logging solution based on the ELK stack
IntelliJ Java 8 Kotlin Java EE JUnit JMeter JBoss Spring Boot/Web Maven HTML5 JS Tomcat JOQQ Hibernate PostgreSQL Docker Jenkins Bitbucket Spinnaker Kubernetes Kafka ELK GCP Linux Jira Confluence Microsoft Teams
Mobile gaming startup
5 Jahre 9 Monate
2011-09 - 2017-05

Coached and helped junior developers

Tech lead/Software architect/Release manager TFS Visual Studio C# ...
Tech lead/Software architect/Release manager
  • Tech lead of the web and mobile team
  • Coached and helped junior developers to better understand software engineering best practices
  • Crafted web and mobile based sports betting products
  • Implemented a HTTP/REST WebAPI-based middleware
  • Provided tech guidance and support for external development partners
  • Member of the company’s Architecture Review Board
  • Established a TFS based build system for CI, release builds and deployment
  • Contributed major improvements to the company’s API/WCF services performance and throughput
  • Prototyped a microservices based architecture with .NET Core, Docker and OpenShift (PaaS)
TFS Visual Studio C# ASP.NET MVC/Web API IIS WCF .NET Core Docker Angular HTML5 JS Flash FlexUnit xUnit Moq DotNetNuke MSBuild SQL Server Linux OpenShift SonarQube Git
BGT (sports betting)
5 Monate
2011-04 - 2011-08

Refactored legacy ASP.NET applications

Freelance senior software engineer C# ASP.NET Web Forms WCF ...
Freelance senior software engineer

Refactored legacy ASP.NET applications and Java web applications/services

C# ASP.NET Web Forms WCF EF SQL Server Java JUnit JSP Servlets Tomcat MySQL Git
Semizen (IT solutions)
6 Monate
2010-10 - 2011-03

Implemented game client

Senior software engineer C# Flash AsUnit ...
Senior software engineer
  • Implemented game client and server features and unit tests
  • Participated in the game architecture design
  • Established and managed the CI/CD system and build/release cycles
C# Flash AsUnit APlay Middleware PostgreSQL TeamCity Facebook API Jira Subversion
Cliffhanger Productions (game studio)
11 Monate
2009-11 - 2010-09

Provided mentoring

Freelance .NET architect TFS C# ASP.NET Web Forms ...
Freelance .NET architect
  • Provided mentoring and technical evangelism in .NET
  • Designed and implemented a reference service architecture based on WCF services
  • Extended legacy Java services and applications
TFS C# ASP.NET Web Forms EF WCF SQL Server IIS Java Servlets JSP Tomcat WIX
TraviAustria (travel industry)
2 Jahre 1 Monat
2007-09 - 2009-09

Architected a game management platform

Freelance software architect/Team lead TFS C# ASP.NET Web Forms ...
Freelance software architect/Team lead
  • Architected a game management platform for online multi-player games
  • Integrated several 3rd party APIs (e.g. payment providers)
  • Provided mentoring and coaching for junior developers
TFS C# ASP.NET Web Forms WCF SQL Server DevExpress Subversion CruiseControl.NET
Acubate (gaming startup)
2 Jahre 3 Monate
2005-04 - 2007-06

Development of a custom CMS solution

Freelance senior software engineer TFS C# ASP.NET Web Forms ...
Freelance senior software engineer

Development of a custom CMS solution for the food industry

TFS C# ASP.NET Web Forms Oracle JavaScript
CSD (IT services)
5 Monate
2004-11 - 2005-03

Development of a web-based inflation calculator

Freelance senior software engineer C# ASP.NET Web Forms IIS ...
Freelance senior software engineer
C# ASP.NET Web Forms IIS SQL Server Excel
WKO
3 Jahre 6 Monate
2001-05 - 2004-10

Design/Development of Java/.NET based financial solutions

Freelance senior software engineer C# Java Swing ...
Freelance senior software engineer
C# Java Swing Servlets C++ HTML/JS
Wincor Nixdorf (banking services)

Aus- und Weiterbildung

Aus- und Weiterbildung

Position

Position

  • Java Software Engineer
  • Software Architect
  • AWS Solution Architect
  • DevOps Consultant
  • CTO

Kompetenzen

Kompetenzen

Top-Skills

Software Engineering Software Architecture Java AWS Solution Architect Spring Boot Spring Microservices Docker Kubernetes OpenShift REST Kafka CI/CD Agile Mindset DevOps Jenkins Grafana IntelliJ .NET

Produkte / Standards / Erfahrungen / Methoden

Bitbucket/GitLab
Confluence
Confluence/Jira
Docker
Hibernate
HTML5
IntelliJ
JBoss
Jenkins
Jira
JMeter
Kafka
Kubernetes
Maven
Microsoft Teams
OpenShift
Prometheus
Quarkus
Spring Boot (and its ecosystem)
Spring Boot/Web
Tomcat
Tomcat/Jetty

OBJECTIVE
I am a Senior Software Engineer/Architect/Tech Lead with over 25 years of experience in the Banking, Travel, Gaming and Sports Betting industry. I have a big passion for crafting products not just software. My focus aims at solving problems and helping my clients deliver business value to their customers. I look forward to bringing in my whole experience to contribute my part to your company?s projects success and help create cutting-edge solutions for your customers.

KEY SKILLS & ABILITIES
Leadership and Agility

  • Strong team player and inspiring leader and mentor with a ?get things done? attitude
  • Effective communicator with various stakeholders on different levels
  • Assume responsibility, no blame assignment, no finger pointing
  • Big believer in Agile Principles and self-empowered cross-functional teams
  • Scrum/Kanban veteran
  • Avid ambassador and practitioner of Continuous Integration/Delivery and DevOps

Engineering

  • Technology enthusiast with a strong engineering background and a big heart for open source
  • Passionate about Clean Code and Software Engineering best practices (e.g. SOLID, DRY, KISS)
  • Experienced in architecting and implementing microservices architectures based on HTTP/REST APIs and/or message brokers
  • Seasoned veteran in JAVA and .NET full-stack software development
  • Experienced with cloud services and CI/CD pipelines for fast feedback and delivery
  • Big interest in blockchain and distributed ledger technologies

Betriebssysteme

Linux
Fortgeschritten
Windows
Experte

Programmiersprachen

Java
Experte
Java 8
Experte
Kotlin
Basics
Java EE
C#
Fortgeschritten
JavaScript
Basics
TypeScript
Basics
Python
Basics
React
Ich lerne es gerade im Selbststudium.
Angular
Basics

Datenbanken

DB2
MySQL
PostgreSQL
SQL Server
Oracle
MongoDB

Vertrauen Sie auf Randstad

Im Bereich Freelancing
Im Bereich Arbeitnehmerüberlassung / Personalvermittlung

Fragen?

Rufen Sie uns an +49 89 500316-300 oder schreiben Sie uns:

Das Freelancer-Portal

Direktester geht's nicht! Ganz einfach Freelancer finden und direkt Kontakt aufnehmen.