Orhan Keskin

Freelance Java Software Developer

Avatar placeholder
Hemer, Germany

Experience

Aug 2022 - Sep 2024
2 years 2 months
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kv.digital GmbH

  • Backend development for appointment and doctor services, including implementing various requirements for managing doctor appointments.
  • SCRUM/Kanban
  • Java 21
  • IntelliJ Idea
  • SpringBoot (MVC, Data JPA, …)
  • GIT
  • Confluence
  • JIRA
  • Maven
  • CI: Jenkins
  • Docker
  • ActiveMQ
  • MariaDB
  • Solr
  • Liquibase
  • Testcontainer
  • JUnit5
  • Mockito
May 2022 - Aug 2022
4 months
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Brenntag

  • Development work and technical consulting on software for recipe order processing.
  • Technical consulting and implementation of pricing software for chemical substances.
  • Java 11
  • IntelliJ Idea
  • SpringBoot (MVC, Data JPA, …)
  • GIT
  • Maven
  • Solr
  • Vaadin
  • MsSQL
  • Docker
  • Azure DevOps
Oct 2021 - Feb 2022
5 months
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Private project

  • Private app development with Jetpack Compose to learn the Kotlin programming language.
Feb 2021 - Sep 2021
8 months
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kv.digital GmbH

  • Development of the vaccination appointment service for kv.digital GmbH.
  • Responsible for backend development of the vaccination appointment service, including implementing vaccination guidelines and managing vaccination appointments for doctors.
  • SCRUM/Kanban
  • Java 11
  • IntelliJ Idea
  • SpringBoot (MVC, Data JPA, …)
  • GIT
  • Confluence
  • JIRA
  • Maven
  • CI: Jenkins
  • Docker
  • MariaDB
  • Solr
  • Liquibase
  • JUnit5
  • Mockito
Nov 2018 - Oct 2020
2 years
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Private solo development of a mobile game app

  • Led and solo-developed a mobile game.
  • Solely responsible for development and coordination of freelancers to obtain assets (graphics, sound, music, marketing).
  • Used the LibGDX hybrid game framework for cross-platform development.
  • Successfully launched the app on the Google Play Store and iOS App Store in November 2020.
Mar 2018 - Oct 2018
8 months
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Vaillant Group

  • Development and implementation of microservices to manage and control remotely operated heating systems.
  • Performing data analysis of specific events such as failures, malfunctions and power consumption.
  • SCRUM
  • Java 8
  • IntelliJ Idea
  • SpringBoot
  • Microservices
  • GIT
  • JIRA
  • Maven
  • CI: Jenkins
  • Docker
  • MariaDB
  • Kafka
  • JUnit5
  • Mockito
Mar 2017 - Aug 2017
6 months
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Bayer

  • Development and implementation of backend microservices to control remotely operated heating systems.
  • Analysis and evaluation of specific events such as failures, malfunctions and power consumption to optimize system performance.
  • SCRUM
  • Angular 2
  • HTML 5
  • CSS
  • Java 8
  • IntelliJ Idea
  • SpringBoot
  • GIT
  • Maven
  • CI: Jenkins
  • MongoDB
  • Solr
  • JUnit5
  • Mockito
Feb 2016 - Dec 2016
11 months
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thyssen krupp steel

  • Development of a component for the manufacturing execution system in the warehouse management area.
  • SCRUM
  • Java 8
  • Eclipse
  • Hibernate
  • GIT
  • Maven
  • CI: Jenkins
  • Oracle

Summary

Thank you for your interest. My name is Orhan Keskin, born in 1976. I have been a passionate Java developer for over 24 years and have gained valuable experience in numerous projects. Since 2010, I have been working as a freelance Java software developer with a clear focus on backend development, especially with Spring Boot.

Skills

  • Java 21
  • Kotlin
  • Spring Boot (Web, Data Jpa, Hibernate, Security, Rest, Ai…)
  • Jsf
  • Vaadin
  • Angular
  • Junit 5
  • Mockito
  • Assertj
  • Restassured
  • Testcontainers
  • Jenkins
  • Docker
  • Activemq
  • Git
  • Maven
  • Gradle
  • Solr
  • Jms
  • Kafka
  • Postgres
  • Mariadb
  • Mongodb
  • Ldap
  • Scrum
  • Kanban
  • Intellij Idea
  • Jira
  • Confluence
  • Android Development With Kotlin And Jetpack Compose
  • Mobile Game Development With Libgdx

Languages

English
Advanced
Turkish
Advanced
German
Elementary

Education

Dortmund University of Applied Sciences and Arts

Diploma in Computer Science (FH) · Dortmund, Germany

Certifications & licenses

PMI – PMP Certified

Project Management Professional

SCJP Sun Certified Java Programmer

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