Freelance backend developer with experience in distributed systems for media and platform projects. Specialized in Java/Kotlin, Spring Boot.
Aktualisiert am 24.06.2025
Profil
Freiberufler / Selbstständiger
Remote-Arbeit
Verfügbar ab: 01.07.2025
Verfügbar zu: 100%
davon vor Ort: 100%
Spring Boot
Kotlin
Java
Typescript
GraphQL
Rest
github
gitlab
git
maven
gradle
jira
Scrum
Microservices Architecture
Kubernetes
CI/CD
German
Muttersprache
English
Fluent
Spanish
Fluent

Einsatzorte

Einsatzorte

Berlin (+50km)
Deutschland
möglich

Projekte

Projekte

1 year
2023-06 - 2024-05

Developed backend services for the ARD Mediathek

Backend Developer Java Kotlin Spring Boot
Backend Developer

  • Developed backend services for the ARD Mediathek (Kotlin, Java, Spring Boot, Kafka, Solr, PostgreSQL)
  • Built and maintained microservices for the ARD Audiothek using TypeScript, Apollo, Kafka
  • Deployed to Google Cloud (GKE), CI/CD with Jenkins and GitLab
  • Monitored systems using Datadog
  • Worked with the data team to integrate a new recommendation engine.
  • Connected a new CMS system to existing services

ARD Mediathek MongoDB Kafka PostgreSQL
Java Kotlin Spring Boot
ARD Online
Mainz and Remote
1 year 5 months
2021-04 - 2022-08

Developed microservices and integrated external APIs (Kotlin, OpenFaaS)

Senior Software Developer Kotlin Docker Api Integrations
Senior Software Developer

  • Automated CI/CD processes with Kubernetes and GitLab
  • Built API integrations for Salesforce, Google Translate, Corona Warn App
  • Practiced test-driven development using JUnit, AssertJ, Mockk




Sharepoint Salesforce HighQ
Kotlin Docker Api Integrations
Bryter GmbH
Remote
3 years 7 months
2018-02 - 2021-08

Developed and maintained all backend services (Spring Boot, Kotlin)

Backend Developer Kotlin Java Spring Boot ...
Backend Developer
  • Built central UserService including integrations with Auth0, Concur, and MongoDB
  • Integrated LDAP and SAML login into global authentication structure
  • Improved code quality through extensive unit and integration testing
  • Monitored Systems using ELK and Prometheus
Salesforce MongoDB RabbitMQ CircleCI Booking Platform OTA GDS AMS
Kotlin Java Spring Boot Rest SOAP
Acomodeo UG
Remote

Aus- und Weiterbildung

Aus- und Weiterbildung

  • Diploma in Physics, Diploma in Computer Science
  • PhD in Engineering Physics
  • Second State Exam for Secondary School Teaching (2018)


Certifications & Awards

  • Certified Kubernetes Application Developer (CKAD)
  • Microsoft Certified: Azure Developer Associate
  • Microsoft Certified: DevOps Engineer Expert

Kompetenzen

Kompetenzen

Top-Skills

Spring Boot Kotlin Java Typescript GraphQL Rest github gitlab git maven gradle jira Scrum Microservices Architecture Kubernetes CI/CD

Produkte / Standards / Erfahrungen / Methoden

Profile
Backend developer with extensive experience in building and integrating distributed systems for media platforms and booking services. Strong expertise in Java/Kotlin with Spring Boot, cloud-native deployments (GKE, Kubernetes, Azure), and data processing via Kafka, Solr, and PostgreSQL. Experienced in SCRUM teams and collaboration with international clients.


Technologies & Tools

  • Languages: Kotlin, Java, TypeScript, Swift, C
  • Frameworks: Spring Boot, Apollo, JUnit, Mockk
  • Cloud & Tools: Google Cloud (GKE), Azure, Firebase, Kafka, RabbitMQ, Solr, PostgreSQL, MongoDB, Git(hub/lab), Jenkins, CircleCI, Maven, Gradle, Kubernetes, Datadog
  • Methodologies: SCRUM, Agile, Kanban


Additional Roles (2007 - 2018)

  • Taught mathematics, computer science, and physics at secondary schools (2016?2018)
  • Co-founder & CEO of a deep tech startup (2012?2014)
  • R&D at TU Berlin (2008?2011)
  • Embedded software development in optoelectronics (2007?2008)

Programmiersprachen

Kotlin
Java
TypeScript
Swift
C

Branchen

Branchen

?

Einsatzorte

Einsatzorte

Berlin (+50km)
Deutschland
möglich

Projekte

Projekte

1 year
2023-06 - 2024-05

Developed backend services for the ARD Mediathek

Backend Developer Java Kotlin Spring Boot
Backend Developer

  • Developed backend services for the ARD Mediathek (Kotlin, Java, Spring Boot, Kafka, Solr, PostgreSQL)
  • Built and maintained microservices for the ARD Audiothek using TypeScript, Apollo, Kafka
  • Deployed to Google Cloud (GKE), CI/CD with Jenkins and GitLab
  • Monitored systems using Datadog
  • Worked with the data team to integrate a new recommendation engine.
  • Connected a new CMS system to existing services

ARD Mediathek MongoDB Kafka PostgreSQL
Java Kotlin Spring Boot
ARD Online
Mainz and Remote
1 year 5 months
2021-04 - 2022-08

Developed microservices and integrated external APIs (Kotlin, OpenFaaS)

Senior Software Developer Kotlin Docker Api Integrations
Senior Software Developer

  • Automated CI/CD processes with Kubernetes and GitLab
  • Built API integrations for Salesforce, Google Translate, Corona Warn App
  • Practiced test-driven development using JUnit, AssertJ, Mockk




Sharepoint Salesforce HighQ
Kotlin Docker Api Integrations
Bryter GmbH
Remote
3 years 7 months
2018-02 - 2021-08

Developed and maintained all backend services (Spring Boot, Kotlin)

Backend Developer Kotlin Java Spring Boot ...
Backend Developer
  • Built central UserService including integrations with Auth0, Concur, and MongoDB
  • Integrated LDAP and SAML login into global authentication structure
  • Improved code quality through extensive unit and integration testing
  • Monitored Systems using ELK and Prometheus
Salesforce MongoDB RabbitMQ CircleCI Booking Platform OTA GDS AMS
Kotlin Java Spring Boot Rest SOAP
Acomodeo UG
Remote

Aus- und Weiterbildung

Aus- und Weiterbildung

  • Diploma in Physics, Diploma in Computer Science
  • PhD in Engineering Physics
  • Second State Exam for Secondary School Teaching (2018)


Certifications & Awards

  • Certified Kubernetes Application Developer (CKAD)
  • Microsoft Certified: Azure Developer Associate
  • Microsoft Certified: DevOps Engineer Expert

Kompetenzen

Kompetenzen

Top-Skills

Spring Boot Kotlin Java Typescript GraphQL Rest github gitlab git maven gradle jira Scrum Microservices Architecture Kubernetes CI/CD

Produkte / Standards / Erfahrungen / Methoden

Profile
Backend developer with extensive experience in building and integrating distributed systems for media platforms and booking services. Strong expertise in Java/Kotlin with Spring Boot, cloud-native deployments (GKE, Kubernetes, Azure), and data processing via Kafka, Solr, and PostgreSQL. Experienced in SCRUM teams and collaboration with international clients.


Technologies & Tools

  • Languages: Kotlin, Java, TypeScript, Swift, C
  • Frameworks: Spring Boot, Apollo, JUnit, Mockk
  • Cloud & Tools: Google Cloud (GKE), Azure, Firebase, Kafka, RabbitMQ, Solr, PostgreSQL, MongoDB, Git(hub/lab), Jenkins, CircleCI, Maven, Gradle, Kubernetes, Datadog
  • Methodologies: SCRUM, Agile, Kanban


Additional Roles (2007 - 2018)

  • Taught mathematics, computer science, and physics at secondary schools (2016?2018)
  • Co-founder & CEO of a deep tech startup (2012?2014)
  • R&D at TU Berlin (2008?2011)
  • Embedded software development in optoelectronics (2007?2008)

Programmiersprachen

Kotlin
Java
TypeScript
Swift
C

Branchen

Branchen

?

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.