Piotr Celowski
Reliable Java Backend Engineer specializing in microservices and system reliability.
Kraków, Poland
Full time/Part time/Project based
Remote
Java Backend Engineer skilled in developing and maintaining robust backend systems and microservices with a focus on clean, maintainable code. Most recently...
Show more
My Career Journey
1/7
Euroclear
Application design analyst
Jul 2025 - Present | 1y 2m
Kraków, PL
Developing microservices using Java 21, working with Docker and OpenShift, maintaining backend services using Oracle DB, deploying services to Azure, owning development of the Archiving Service, debugging...
Show more
CAE
Software Engineer
Sep 2023 - Jun 2025 | 1y 9m
Kraków, PL
Led integration of Recovery Manager with Movement Manager, developed backend functionalities in distributed systems, maintained applications and resolved issues, built CI/CD pipelines in Azure DevOps,...
Show more
ETPA
Software Developer
Aug 2022 - Jul 2023 | 11m
Valletta, MT
Implemented integrations with the XBID system, developed microservices using DDD, CQRS, event-driven architecture, automated deployment processes, maintained and improved backend systems.
Pegasystems
Software Engineer / SDET
Feb 2020 - Jul 2022 | 2y 5m
Kraków, PL
Developed backend functionalities and reporting features, built and maintained internal testing frameworks, automated testing and deployment processes, worked with AWS-based environments.
Aptiv
Scrum Master / Software Systems Test Engineer
May 2019 - Jan 2020 | 8m
Kraków, PL
Facilitated Agile processes and team collaboration, designed and executed system tests, automated testing and analyzed data using Python.
FEV Group
Simulation Engineer
Feb 2018 - Apr 2019 | 1y 2m
Kraków, PL
Conducted piston thermal simulations and system analysis, collaborated in multidisciplinary engineering teams.
General Electric
Design / Performance Engineer
Oct 2013 - Jan 2018 | 4y 3m
Warszawa, PL
Worked on thermal design of combustor systems for jet engines and gas turbines, performed heat transfer and performance analysis of engine components, conducted piston thermal simulations and system analysis,...
Show more
Analytical Thinking
Problem Solving
Proactivity
Curiosity
Most proud of (2/3)
1st
Diagnosed and fixed Archiving performance issue by analyzing logs with GitHub Copilot, reducing manual troubleshooting.
2nd
Built Core Settlement Service POC using Hexagonal Architecture and DDD, partnering with business to balance evolving requirements.
Career Highlights
1/2
Software engineer — Archiving service, production incident
Diagnosed and fixed Archiving performance bottleneck
krakow, 2026
As a software engineer I led the diagnosis of a production performance problem in the Archiving...
Show more
POC lead collaborating with business stakeholders to enable production readiness
Built Core Settlement Service POC with Hexagonal DDD
krakow, 2026
As lead on the Core Settlement Service proof-of-concept I partnered closely with business stakeholders...
Show more
