Almost 10+ years of extensive experience in Java software development.
Aktualisiert am 14.05.2026
Profil
Freiberufler / Selbstständiger
Remote-Arbeit
Verfügbar ab: 01.06.2026
Verfügbar zu: 100%
davon vor Ort: 100%
Java
Spring Boot
Microservices
Docker
REST
Google Cloud
Kotlin
Kafka
English
Verhandlungssicher
German
Grundkenntnisse

Einsatzorte

Einsatzorte

Berlin (+100km)
Deutschland
möglich

Projekte

Projekte

1 Jahr 7 Monate
2024-11 - heute

Building real time bond trading web application

Senior Java Entwickler Java 21 SpringBoot (microservices) Kafka ...
Senior Java Entwickler
Building real time bond trading web application, based on Bloomberg market data with other 3rd party connectivities. Designing, Developing, Testing, Deploying, Monitoring services
Java 21 SpringBoot (microservices) Kafka Event-driven Websocket GitLab Agile
Fintech company
1 Jahr 10 Monate
2023-01 - 2024-10

Supported several projects

Senior Java Entwickler
Senior Java Entwickler
Supported several projects, focused on splitting the core backend monolith into microservices in order to improve maintainability, scalability and reliability. Worked on improving performance of core products.
Consultancy
1 Jahr 10 Monate
2021-04 - 2023-01

Maintained Report & Case management system

Java Entwickler Java 17 Spring Boot Batch processing ...
Java Entwickler
  • Maintained Report & Case management system, identified and reduced user reported defects, integration & configuration ish, Scrum ceremonies.
  • Produced well tested and reliable code. Integrated unit and functional (end-to-end) tests.
  • Managed cutting-edge technologies to improve legacy applications.
  • Collaborated closely with frontend engineers to determine required APIs.
  • Provided training and support for onboarding team members.
Java 17 Spring Boot Batch processing Liquibase Keycloak auth server. Gitlab PostgreSQL Hibernate Hazelcast Zookeeper Elasticsearch Docker VoIP Asterisk (PBX)
BusinessKeeper GmbH
Berlin
8 Monate
2020-08 - 2021-03

Product support, designing Java/Kotlin

Senior Java Entwickler ArgoCD Octopus Deploy Gitlab ...
Senior Java Entwickler
  • Product support, designing Java/Kotlin micro-services, deploying and releasing to production.
  • Design/Redesign REST APIs, write unit and Integration tests, and perform CI/CD pipelines.
  • Gathered and addressed technical and design requirements. Collaborated with Front-end developers to integrate user-facing elements with server side logic. Groomings, backlog refinement meetings, retrospectives, knowledge sharing, code refactoring/improvements, code reviews. 
  • Monitored and analyzed Kibana dashboards.
ArgoCD Octopus Deploy Gitlab Docker K8s.
Storecast GmbH, Berlin
2 Jahre 10 Monate
2017-06 - 2020-03

Built booking airline systems

Senior Java Developer Java SpringBoot XSLT ...
Senior Java Developer
  • Integrated new services based on REST/SOAP architecture using Messaging Queues Broker Bus (IBM WebSphere), integration and unit testing. 
  • Analyzed and moved legacy systems to microservices architecture. 
  • Collaborated with the team, knowledge sharing, code reviews and code quality.
  • Production support including analyzing and resolving defects. Automated and improved scripts on production.
  • Identified and suggested new technologies and tools for enhancing product value and increasing team productivity. 
  • Training, hackathons and presentations, research and applying new practices.
  • IATA, OTA(Open Travel Alliance)
Java SpringBoot XSLT XPath XQuery JAXB Jackson Spring Cloud Eureka Zuul Ribbon Feign Hystrix
Aer Lingus - Irish Airline
4 Jahre 4 Monate
2013-02 - 2017-05

Designed and implemented

Java Full-Stack Developer
Java Full-Stack Developer
  • Designed and implemented e-commerce services, persistence, presentation layers. 
  • Created RESTful APIs for increased scalability of the application. 
  • Integrated 3rd party services AWS S3, Socialnetworks & more. 
  • Performed integration  and unit testing. 
  • Translated business needs into implementation.
BSW, ZipTal (E-Commerce)
1 Jahr 7 Monate
2011-08 - 2013-02

Researched and implemented

Java Backend Developer
Java Backend Developer
  • Researched and implemented Google Web Toolkit application. 
  • Identified areas of improvement, analyzed and documented defects in the tracking system. 
  • Troubleshoot various software issues using debugging processes, coding techniques.
  • Managed & analyzed log files to find information, facilitate problem resolution.
ISD (Healthcare)
4 Jahre 5 Monate
2007-03 - 2011-07

Participated in a full lifecycle of development

Java Full-Stack Developer
Java Full-Stack Developer
  • Participated in a full lifecycle of development for company desktop/web applications. 
  • Responsible for software maintenance across the codebase required wide understanding of the internals of the software and systems.
  • Utilized object-oriented programming.
  • Increased application performance(searching, accessing resources).
  • Performed JUnit, Selenium, JMeter tests. 
  • Investigated, resolved issues determining problem root cause.
Softserve

Aus- und Weiterbildung

Aus- und Weiterbildung

2003-2009

Ukrainian State University of Information and Communication Technologies, ComputerSystems and Networks, Maste


Certifications

  • Sun Certified Java Professional SE6
  • Oracle Certified Java 8 Professional

Kompetenzen

Kompetenzen

Top-Skills

Java Spring Boot Microservices Docker REST Google Cloud Kotlin Kafka

Produkte / Standards / Erfahrungen / Methoden

JAVA BACKEND ENTWICKLER

Almost 10+ years of extensive experience in Java software development. Solid background in Object-Oriented analysis and design, comprehensive knowledge of system development life cycle, physical and logical data modeling, performance tuning, troubleshooting, enterprise-level systems development. Having experience in such domains: Retail, Airline, Health Care, Gambling, E-Commerce, FinTech. Worked with different sized teams, as well as international teams.


Skills

  • JVM languages (Java, Kotlin), Spring Boot, Docker, K8s, Unix/Linux,
  • NoSQL (MongoDB), Postgres, MySQL. JDBC, JPA(Hibernate), Spring Data
  • TDD, JUnit, Mockito, RestAssured, WireMock, SonarQube
  • Git, Gitlab, Bitbucket, Maven, Gradle, JGitFlow branching strategies
  • JIRA, Jenkins pipeline, Octopus deployment, Scrum, Kanban | SOLID, DRY, KISS

Einsatzorte

Einsatzorte

Berlin (+100km)
Deutschland
möglich

Projekte

Projekte

1 Jahr 7 Monate
2024-11 - heute

Building real time bond trading web application

Senior Java Entwickler Java 21 SpringBoot (microservices) Kafka ...
Senior Java Entwickler
Building real time bond trading web application, based on Bloomberg market data with other 3rd party connectivities. Designing, Developing, Testing, Deploying, Monitoring services
Java 21 SpringBoot (microservices) Kafka Event-driven Websocket GitLab Agile
Fintech company
1 Jahr 10 Monate
2023-01 - 2024-10

Supported several projects

Senior Java Entwickler
Senior Java Entwickler
Supported several projects, focused on splitting the core backend monolith into microservices in order to improve maintainability, scalability and reliability. Worked on improving performance of core products.
Consultancy
1 Jahr 10 Monate
2021-04 - 2023-01

Maintained Report & Case management system

Java Entwickler Java 17 Spring Boot Batch processing ...
Java Entwickler
  • Maintained Report & Case management system, identified and reduced user reported defects, integration & configuration ish, Scrum ceremonies.
  • Produced well tested and reliable code. Integrated unit and functional (end-to-end) tests.
  • Managed cutting-edge technologies to improve legacy applications.
  • Collaborated closely with frontend engineers to determine required APIs.
  • Provided training and support for onboarding team members.
Java 17 Spring Boot Batch processing Liquibase Keycloak auth server. Gitlab PostgreSQL Hibernate Hazelcast Zookeeper Elasticsearch Docker VoIP Asterisk (PBX)
BusinessKeeper GmbH
Berlin
8 Monate
2020-08 - 2021-03

Product support, designing Java/Kotlin

Senior Java Entwickler ArgoCD Octopus Deploy Gitlab ...
Senior Java Entwickler
  • Product support, designing Java/Kotlin micro-services, deploying and releasing to production.
  • Design/Redesign REST APIs, write unit and Integration tests, and perform CI/CD pipelines.
  • Gathered and addressed technical and design requirements. Collaborated with Front-end developers to integrate user-facing elements with server side logic. Groomings, backlog refinement meetings, retrospectives, knowledge sharing, code refactoring/improvements, code reviews. 
  • Monitored and analyzed Kibana dashboards.
ArgoCD Octopus Deploy Gitlab Docker K8s.
Storecast GmbH, Berlin
2 Jahre 10 Monate
2017-06 - 2020-03

Built booking airline systems

Senior Java Developer Java SpringBoot XSLT ...
Senior Java Developer
  • Integrated new services based on REST/SOAP architecture using Messaging Queues Broker Bus (IBM WebSphere), integration and unit testing. 
  • Analyzed and moved legacy systems to microservices architecture. 
  • Collaborated with the team, knowledge sharing, code reviews and code quality.
  • Production support including analyzing and resolving defects. Automated and improved scripts on production.
  • Identified and suggested new technologies and tools for enhancing product value and increasing team productivity. 
  • Training, hackathons and presentations, research and applying new practices.
  • IATA, OTA(Open Travel Alliance)
Java SpringBoot XSLT XPath XQuery JAXB Jackson Spring Cloud Eureka Zuul Ribbon Feign Hystrix
Aer Lingus - Irish Airline
4 Jahre 4 Monate
2013-02 - 2017-05

Designed and implemented

Java Full-Stack Developer
Java Full-Stack Developer
  • Designed and implemented e-commerce services, persistence, presentation layers. 
  • Created RESTful APIs for increased scalability of the application. 
  • Integrated 3rd party services AWS S3, Socialnetworks & more. 
  • Performed integration  and unit testing. 
  • Translated business needs into implementation.
BSW, ZipTal (E-Commerce)
1 Jahr 7 Monate
2011-08 - 2013-02

Researched and implemented

Java Backend Developer
Java Backend Developer
  • Researched and implemented Google Web Toolkit application. 
  • Identified areas of improvement, analyzed and documented defects in the tracking system. 
  • Troubleshoot various software issues using debugging processes, coding techniques.
  • Managed & analyzed log files to find information, facilitate problem resolution.
ISD (Healthcare)
4 Jahre 5 Monate
2007-03 - 2011-07

Participated in a full lifecycle of development

Java Full-Stack Developer
Java Full-Stack Developer
  • Participated in a full lifecycle of development for company desktop/web applications. 
  • Responsible for software maintenance across the codebase required wide understanding of the internals of the software and systems.
  • Utilized object-oriented programming.
  • Increased application performance(searching, accessing resources).
  • Performed JUnit, Selenium, JMeter tests. 
  • Investigated, resolved issues determining problem root cause.
Softserve

Aus- und Weiterbildung

Aus- und Weiterbildung

2003-2009

Ukrainian State University of Information and Communication Technologies, ComputerSystems and Networks, Maste


Certifications

  • Sun Certified Java Professional SE6
  • Oracle Certified Java 8 Professional

Kompetenzen

Kompetenzen

Top-Skills

Java Spring Boot Microservices Docker REST Google Cloud Kotlin Kafka

Produkte / Standards / Erfahrungen / Methoden

JAVA BACKEND ENTWICKLER

Almost 10+ years of extensive experience in Java software development. Solid background in Object-Oriented analysis and design, comprehensive knowledge of system development life cycle, physical and logical data modeling, performance tuning, troubleshooting, enterprise-level systems development. Having experience in such domains: Retail, Airline, Health Care, Gambling, E-Commerce, FinTech. Worked with different sized teams, as well as international teams.


Skills

  • JVM languages (Java, Kotlin), Spring Boot, Docker, K8s, Unix/Linux,
  • NoSQL (MongoDB), Postgres, MySQL. JDBC, JPA(Hibernate), Spring Data
  • TDD, JUnit, Mockito, RestAssured, WireMock, SonarQube
  • Git, Gitlab, Bitbucket, Maven, Gradle, JGitFlow branching strategies
  • JIRA, Jenkins pipeline, Octopus deployment, Scrum, Kanban | SOLID, DRY, KISS

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