Jan fabian R. - Software Engineer / Software Architect / Team Lead

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Münster, Germany

Experience

Jan 2024 - Present

1 year 9 months

Software Engineer / Software Architect / Team Lead

jaraco GmbH

Design and implementation of modern DevOps pipelines
AI-assisted software development (including prompt engineering with GitHub Copilot)
Architecture and development of microservices
Introduction of Kafka for message-based interservice communication
Leading a development team
Technology environment: Spring Boot, Kafka, Kotlin, Azure, Helm, Kubernetes, Maven, Node.js, GitHub, GitHub Copilot, GraphQL, OpenAPI, Avro

Apr 2022 - Dec 2024

2 years 9 months

IT Consultant / Enterprise Architect

jaraco GmbH

Migration consulting for legacy systems into an on-premise OpenShift environment
Development of migration strategies and methods
Tool and process consulting and integration into a consistent overall process
Quality assurance measures in the migration context
Coordination of workstreams and technical consulting
Support for project management to stabilize operations
Technology environment: Java, SaFe, Spring Boot, OpenShift, Java EE, C++, Docker, Jenkins, Gradle, Tomcat, Prometheus, Grafana, Scrum, Bitbucket, SonarQube, Dynatrace, Harbor, arc42, Eclipse

Sep 2021 - Dec 2023

2 years 4 months

Software Architect / Software Engineer / Team Lead

jaraco GmbH

Architecture design and implementation
API design and building data pipelines
International collaboration (DE, UK, IN, RO, VN)
Coaching, training and support for development teams
Code and architecture reviews and error analysis
Technology environment: Spring Boot, Kotlin, Google Cloud, GitLab, RabbitMQ, Kubernetes, GraphQL, JSON:API, Elide, Python, Java, Elastic Stack, Kibana, Linux, DevOps, arc42, Eclipse

Apr 2021 - Sep 2021

6 months

Software Engineer / Architect / Consultant

jaraco GmbH

Designing and implementing technical solutions
API design and message processing
Frontend development with Angular
International teamwork (DE/IN)
Technology environment: Spring Boot, Kotlin, OpenShift, Kafka, GitLab, Sonar, Linux, GraphQL, Angular, Java, Avro, DevOps, Caldera Cluster, Kibana, Scrum, Eclipse

May 2020 - Mar 2021

11 months

Software Architect

jaraco GmbH

Design and build REST APIs
Processing large volumes of data using batch and event-based pipelines
Architecture consulting and error analysis
Leading a team in an international environment (DE/RO)
Technology environment: Hadoop, Spark, Kafka, Redis, Kubernetes, Docker, GitLab CI/CD, Spring Boot, Livy, Elastic Stack, Grafana, React, OpenAPI, Java, Microservices, Eclipse

Mar 2020 - Dec 2024

4 years 10 months

Consultant

jaraco GmbH

Consulting on Dovecot / Ceph / Dovecot-Ceph plugin
Support during go-live, performance tests, bug fixing, and enhancements
Technological environment: Dovecot, Ceph, C/C++

Feb 2020 - Jul 2021

1 year 6 months

Full-Stack Developer / Coach

jaraco GmbH

Developed a smart tracking solution
Migrated legacy systems to microservices
Built and trained a development team
Code reviews and international troubleshooting (DE/FR)
Technological environment: AWS, Spring Boot, Angular, Ionic, Kafka, WebSockets, REST, Docker, GitLab, Sonar, Java, Elastic Stack, Kibana, Linux, DevOps, Scrum, Eclipse

Aug 2019 - Dec 2019

5 months

Belgium

Consultant Commissioning / Error Analysis / Coach

Freelance / Self-Employed

Supported commissioning of a warehouse system in Belgium
Error analysis, ticket creation, and retests
Advising and training staff
Technological environment: Java, SQL, JIRA, IQ, SCADA, Oracle, Eclipse

Aug 2019 - Sep 2019

2 months

Consultant Development Process / Product Development / Coach

Freelance / Self-Employed

Analyzed development processes (C# WPF)
Performance requirements and recommendations
Set up a Scrum team and pair programming
Technological environment: C#, C++, WPF, Siemens PCS 7, Scrum, GitLab, Windows, Eclipse

May 2017 - Mar 2020

2 years 11 months

Project Manager / C/C++/Go Engineer

Freelance / Self-Employed

Developed a Ceph plugin for Dovecot
Conducted load tests and performance analyses
Migrated Dovecot versions including plugin adjustments
Set up a DevOps test environment
Transition to Git, including consulting and commissioning support
Code reviews and sustainable bug fixes
Technological environment: Dovecot, Ceph, C/C++, IMAP, POP3, LMTP, Valgrind, Google Test, Eclipse CDT, Linux, Scrum, Git, imaptest, Docker, Travis CI, InfluxDB, Grafana, Kafka, Go, TDD, CI, TeamCity, SUSE Linux, Jira, GitLab

Jun 2016 - Sep 2016

4 months

C# Engineer Product Development

Freelance / Self-employed

Prototype development and requirements analysis
Technology environment: WPF, Firebird DB, C#, Enterprise Architect, TDD, Jenkins CI, SVN, NUnit, NuGet, C# Unity, VB6

Apr 2016 - Jul 2016

4 months

Java Engineer / Consultant

Freelance / Self-employed

Android app for cloud video streaming
Agile working with modern CI/CD processes
Technology environment: (S)RTP, (S)RTCP, RTSP, Spring Boot, CI/CD, Git, REST, JSON, TCP/IP, Maven, Gradle, IntelliJ, Scrum

Dec 2015 - Jul 2016

8 months

Java EE Engineer / Component Designer

Freelance / Self-employed

Building a messaging system with Apache Camel and ActiveMQ
Unit and integration tests, prototype development, SSO
Technology environment: Apache Camel, Spring Boot, Wildfly, ActiveMQ, JPA, Oracle 11g, Jenkins, Tomcat, IntelliJ, Microsoft Active Directory

Sep 2014 - Dec 2015

1 year 4 months

Software Developer Full Stack

Freelance / Self-employed

Control software, visualization, performance and functional testing in Hungary
Technology environment: Oracle 11g, PLSQL, Java 7/8, C#, WPF, WebSockets, Spring Boot, Hibernate, REST, SOAP, Jenkins, Telerik UI, Microservices, JSON, XML, NHibernate, Eclipse

Aug 2014 - Sep 2014

2 months

Java Developer Apache Wicket

Freelance / Self-employed

Development of Wicket components with JS frontend
Technology environment: Wildfly, Apache Wicket, Telerik UI, JavaScript, HTML5, Maven, CI/CD

Jun 2014 - Aug 2014

3 months

United Kingdom

C# Developer (WPF, MVVM)

Freelance / Self-employed

Test automation, framework optimization, commissioning in Scotland
Technology environment: C#, WPF, MVVM, NUnit, Jenkins CI, TCP/IP, SOAP, Enterprise Architect

Dec 2013 - Jun 2014

7 months

Full Stack Developer Framework / Product Development

Freelance / Self-employed

Visualization of logistics processes and framework development
Technology environment: Java EE, WPF, C#, PL/SQL, JMS, JPA, Oracle 11g, WebSocket, REST, SOAP, Spring Boot, Jenkins, JSON, XML, SVN, Eclipse

Feb 2012 - Sep 2012

8 months

Unterhaching, Germany

Software Engineer & Subproject Manager

Iteratec GmbH

Java development in an agile software project
Subproject management and coordination of technical implementation
Collaboration with business units to define technical requirements

Nov 2011 - Feb 2012

4 months

C# Developer – Distributed WPF Application

Freelance / Self-employed

Development of a distributed evaluation software with WPF GUI
Technology environment: C#, WPF, MVVM, TCP/UDP, IP Multicast, SVN, Enterprise Architect

Nov 2011 - Feb 2012

4 months

Full Stack Developer Java EE, OSGi, Embedded C

Freelance / Self-employed

Smart meter software development (Java/C) including web services
Technology environment: Apache Felix, JBoss, Embedded C, REST, SOAP, JSON, oscilloscope, Target 3001