Piotr J. - Work in computer science as Lead Software Engineer (J2EE, Java SE, SQL).

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Wejherowo, Poland

Experience

Jan 2025 - Dec 2025

1 year

Kraków, Poland

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OEC

Development, maintenance and tests of automotive projects related to parts management with Angular, Spring Boot and Apigee API
Usage of MyBatis, Swing and JGoodies frameworks
Migration of legacy code of frameworks and tools related to versioning, validation and conversion of data in authoring services managing parts, fluids and prices
Project organized in SCRUM methodology with Azure DevOps

Jan 2024 - Sep 2024

9 months

Gdańsk, Poland

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GlobalLogic

Designed, developed and tested IoT solution delivering UI, business logic and persistence tier for data retrieved by network of sensors as a consultant in Verizon company
Built software platform on Spring Boot WebFlux with Apache Kafka (MSK) as event streaming and JOOQ as database mapping solution
Developed GitLab CI/CD pipeline with Terraform and Helm to automate infrastructure creation and perform Kubernetes (EKS) deployments

Jan 2023 - Aug 2023

8 months

Gdańsk, Poland

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Astek Polska

Full stack web development and maintenance of the invoice handling application based on Websphere Liberty Profile with proprietary UI framework
Implemented backend business logic for semantic and syntactic validations of user inputs
Created flows and calls to invoke modules in the monolithic architecture
Developed, designed and tested replication module implementing Self Contained Service architecture using Kafka Streams to log database modifications
Wrote Mockito and JUnit tests meeting code coverage requirements
Applied object-oriented programming, SOLID principles and design patterns
Performed optimization, refactoring and static code analysis
Conducted code reviews and debugging in Eclipse and IntelliJ
Worked in SCRUM and SAFe methodologies

Jan 2023 - Mar 2023

3 months

Gdańsk, Poland

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Lufthansa Systems

Continued project for Hapag-Lloyd, working on employee shift scheduling application
Developed REST endpoints in the backend based on Spring Boot

Jan 2022 - Jan 2023

1 year 1 month

Wrocław, Poland

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Ryanair Labs

Developed backend Java projects on AWS infrastructure using Spring Boot with Spring Cloud, DynamoDB, Hibernate, SQS, RDS, EC2, Lambda, CloudFront and CloudFormation
Performed data migration with MySQL and Aurora
Utilized Spring MVC and Reactor frameworks
Monitored logs with Kibana and New Relic
Developed tool based on DynamoDB NoSQL database to replicate data and improve performance

Jan 2022 - Jul 2022

7 months

Gdańsk, Poland

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Astek Polska

Developed and maintained web application for Hamburg Sud based on JBoss AS with JSF and Hibernate allowing business users to manage cargo vessel schedules
Worked in SCRUM methodology

Jan 2020 - Nov 2020

11 months

Gdańsk, Poland

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Maxima Europe

Designed and developed monitoring tool for State Street Corporation to control financial data and transactions using Spring Boot, Apache Kafka, Oracle DB and ReactJS
Implemented Streams API, Consumer API and Producer API on multiple brokers and partitions
Handled REST API to transfer data between frontend and backend
Developed ReactJS application deployed on Spring Boot instance
Used Hibernate with HQL, JPQL and Criteria queries for persistence layer access

Jan 2019 - Sep 2021

2 years 9 months

Gdynia, Poland

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Vector Smart Data

Developed and maintained data acquisition system and monitoring center using JBoss AS, JSF and Hibernate
Created microservices handling domain-specific features with Spring Boot and REST
Worked in SCRUM methodology

Jan 2015 - Aug 2017

2 years 8 months

France

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Amadeus

Designed, developed and tested internal deployment software for company applications and data using SOA, J2EE and JBoss AS
Maintained continuous integration workflow with Jenkins, GIT Stash and Maven
Rolled out quality assurance procedures including ALM and code review
Supported release activities and implemented solution to replicate legacy application data to SQL database using SQL and JMS

Jan 2012 - May 2012

5 months

Grenoble, France

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France Telecom, Orange Labs

Researched and developed monitoring service for memory and processor resources usage on OSGI platform
Profiled threads and sampling methods in Java
Developed graphical interface in Java, Ajax and C/C++ to control services on OSGI platform
Detected malicious and low-quality bundles and implemented alerts and triggering using Package Resolver
Applied Autonomic Manager system design and worked with JVM API, JVMTI and native methods
Analyzed Felix OSGI environment and conducted performance tests with SIGPROF Unix signals

Jan 2011 - Dec 2011

1 year

Paris, France

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Alcatel-Lucent

Introduced test framework to automate functional tests of wireless network provisioning application
Developed technical documentation generator in Java and Ruby; tests in Cucumber, XML and XSL
Worked in Agile and SCRUM frameworks with JIRA and Hudson CI
Developed with DocBook, XSL, XSLT and Apache FOP
Created Eclipse plugin (OSGI) integrating semantic checks with proprietary IDE
Integrated with Hudson CI server and Maven build automation
Delivered gems and plugins to common repository
Designed test cases handling given-when-then logic and created domain-specific language for wireless management solution testing
Wrapped kernel methods with JRuby on JVM and used Nexus for artifact deployment and SVN for source code management