Orhan Keskin - Java Backend Developer for Spring Boot

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Hemer, Germany

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Experience

Aug 2022 - Sep 2024

2 years 2 months

kv.digital GmbH

Backend development work for appointment and doctor services, including the implementation of 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

Brenntag

Development work and technical consulting for 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

Private project

Private app development with Jetpack Compose to learn the programming language Kotlin.

Feb 2021 - Sep 2021

8 months

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

Private solo development of a mobile game app

Lead and solo development of a mobile game.
Independent development and coordination of freelancers for sourcing assets (graphics, sound, music, marketing).
Use of the hybrid game framework LibGDX for cross-platform development.
Successful release of the app in the Google Play Store and iOS App Store in November 2020.

Mar 2018 - Oct 2018

8 months

Vaillant Group

Development and implementation of microservices for managing and controlling remote heating systems.
Analysis of data for specific events such as outages, 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

Bayer

Development and implementation of backend microservices for controlling remote heating systems.
Analysis and evaluation of specific events such as outages, 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

thyssen krupp steel

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

Industry experience

See where this freelancer has spent most of their professional time.

Experienced in Information Technology, Healthcare, Media and Entertainment, Metals and Mining, Chemical, and Energy.

Information Technology

Healthcare

Media and Entertainment

Metals and Mining

Chemical

Energy

Business area experience

See which departments and functions this freelancer has contributed to most.

Experienced in Information Technology, Product Development, Marketing, Project Management, and Logistics.

Information Technology

Product Development

Marketing

Project Management

Logistics

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

Fachhochschule Dortmund

Diploma in Computer Science (FH) · Dortmund, Germany

Certifications & licenses

Statistics

Experience

Total positions 8

Experience in Information Technology 4.5 y

Avg length 11 m

Longest experience 2 y 1 m

Expertise

Main industries Information Technology, Healthcare, Media and Entertainment

Main business areas Information Technology, Product Development, Marketing

Qualifications

Certifications earned 3

Profile

Member since

August 2025

Last update

August 2026

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Frequently asked questions

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Orhan is based in Hemer, Germany and can operate in on-site, hybrid, and remote work models.

Orhan speaks the following languages: English (Advanced), Turkish (Advanced), German (Elementary).

Orhan has at least 7 years of experience. During this time, Orhan has worked and for 7 different companies. The average length of individual experience is 1 year and 11 months. Note that Orhan may not have shared all experience and actually has more experience.

In recent years, Orhan has worked for kv.digital GmbH, Brenntag, and Private project.

Orhan is most experienced in industries like Information Technology, Healthcare, and Media and Entertainment. Orhan also has some experience in Metals and Mining, Energy, and Pharmaceutical.

Orhan is most experienced in business areas like Information Technology, Product Development, and Marketing. Orhan also has some experience in Project Management and Logistics.

Orhan has recently worked in industries like Healthcare, Information Technology, and Chemical.

Orhan has recently worked in business areas like Information Technology and Product Development.

Orhan attended Fachhochschule Dortmund.

Orhan has 3 certificates. These include: PMI – PMP Certified, Project Management Professional, and SCJP Sun Certified Java Programmer.

Orhan is immediately available for suitable projects.

Daily rate distribution

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<€840 €960-1000 €1000-1040 €1040+

The rates shown represent the typical market range for freelancers in this position based on recent contracts on our platform.

Average rates for similar positions

Rates are based on recent contracts and do not include FRATCH margin.

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Daily rate avg. 966 €

The average daily rate is the mean of all daily rates from recent contracts of comparable freelancers on our platform.

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900

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Median rate 1000 €

The median daily rate is the middle value of all daily rates — half of comparable freelancers charge less, half charge more. Unlike the average, it is barely affected by outliers.

Calculated based on our freelancers’ daily rates as of 21 Aug 2026. Actual rates may vary depending on seniority level, experience, skill specialization, project complexity, and engagement length.