07.2021—06.2025: Transition Technology PSC - Position: Java/JS Developer
Agile/Scrum · Backend systems · Integrations
In early projects, I collaborated with small, agile teams and also led a project
independently, where I delivered a fully functioning platform extension for an air carrier
company. The goal was to implement secure REST API services for integrating with client
applications. The project required a strong emphasis on security and API design best practices.
I had the opportunity to gain experience working with large manufacturing facilities, for
instance, in developing a layout for displaying KPIs on large screens in production lines.
During these projects, I collaborated with international teams and effectively communicated in
English. Following this, I gained experience in an R&D project for a watch company within a
Scrum framework, actively participating in all Agile ceremonies (daily stand-ups, grooming
sessions, sprint planning). This project, developed entirely in java, included dedicated QA and
code review teams focused on specific modules, which allowed me to understand how to scale
Feature Development and integrate efficiently into a large team. Currently, I am part of a
Greenfield project, working from start to MVP. The platform is designed for system integration
and workflow automation, with responsibilities including the design and implementation of
Kafka-based messaging, REST, and SOAP services. I have been hands-on with technologies such as
Spring, Kafka, Docker, React, and Angular to ensure a modern, scalable architecture. Throughout
my journey, I have honed my ability to deliver both new feature requests and enhance existing
systems with new functionalities.
06.2025-Present: Mennica Polska - Position: Java Mid Developer
Public Transportation · Backend Systems · Spring boot · Integrations
Maintenance Project (Ticketing Systems — Two Major Polish Cities)
Full ownership of maintenance and development of two production backend systems for public
transportation ticket sales. Designed and implemented integration modules for communication with
a central system. Performed database optimization including query tuning, indexing, and
performance improvements. Refactored legacy code into a more modern, flexible, secure, and
high-performance architecture. Ensured stability and reliability of business-critical systems.
Implemented minor enhancements and fixes in the web-based administrative panel (Angular UI).
Operated and developed containerized production applications deployed in the AWS cloud
environment.
Greenfield Project (Modern Ticketing Platform)
Actively participated in building a new, scalable ticket sales platform from the ground up.
Worked with modern technology stack including Java 21, Spring Boot 4, Jenkins, CI/CD pipelines,
monitoring, and metrics. Contributed to technology and architectural decisions to ensure
scalability, easy onboarding of new cities, and compliance with business and non-functional
requirements. Co-designed solutions focused on high availability, security, performance, and
extensibility.
