Freelancer profile translated to English.

Description

Since 2018, I have been working as a Full Stack Software Developer, primarily with React.js and the Spring Framework. After working for a Swiss bank in Zurich for three years, I decided to become a freelancer.

I am not just a coder. It is important to me to understand business problems, clearly define the technical solution, and find the best tools for it. Even if it means learning a new language or framework – fortunately, I always enjoy doing that.

Languages

Polish
Native or bilingual
German
Fluent
English
Fluent

Workplace preferences

Can work on-site

Zürich (up to 50km)

Freelance
Full Stack Engineer
August 2024 - Today (1 year and 10 months)
Zürich, Switzerland
Providing web development services. Implementing full-stack web applications using Java and JavaScript.
EPAM Systems
Senior Software Engineer
DIGITAL AND IT
August 2023 - April 2024 (8 months)
Zürich, Switzerland
Designed and developed an API Management Portal, integrating over 500 APIs, using React.js for the frontend and Hibernate and Spring for the backend.

Improved database query performance by optimizing Hibernate fetching strategies. Refined a query from an average execution time of 4 seconds to approximately 100 milliseconds.

Implemented traffic validation policies in Java for an API Management Gateway handling over 3 billion monthly calls.

Developed a job scheduling system to update the database with data from various sources at regular intervals, managing approximately 40 daily jobs across multiple application instances.
Sabre Corporation
Associate Software Developer
SOFTWARE PUBLISHING
May 2019 - March 2021 (1 year and 10 months)
Krakau, Poland
Worked on an application for a train ticketing system, utilizing Spring for the backend and React.js for the frontend. Collaborated effectively within an agile team of approximately 15 developers.

Integrated APIs from various European companies into a single interface, enabling train bookings in 9 different countries.

Improved quality and test coverage by increasing the number of unit, integration, and end-to-end tests in the codebase.

Updated the frontend by migrating from classic React class components to functional components, using hooks for better separation of concerns and to reduce boilerplate code.