About Me
Senior .NET Developer with 6+ years of experience designing and delivering high-quality backend systems and integrations. Strong technical ownership, proven expertise in system architecture, and experience facilitating agile teams. Passionate about building reliable, scalable software, mentoring colleagues, and growing into engineering leadership roles.
Technical skills:
C#/.NET Software Architecture Git/TFVC AWS/Azure Jira/Azure DevOps TeamCity/Azure Pipelines Oracle/SQL Server/PostgreSQL React/Vue.js Swift
Soft skills:
Willingness to learn Problem analysis & solving Teamwork Technical leadership Recruitment
Languages:
Polish (native) English (C1) Italian (A1) Spanish (A1)
Experience
Shiji Group
Senior Backend Developer
June 2024 - Present
- Build and improve distributed Daylight PMS and REST APIs in .NET, enabling seamless integrations between PMS and external hotel partners
- Design and deliver scalable microservices leveraging Kafka for event-driven communication and AWS for cloud deployment
- Drive code quality and engineering standards through in-depth reviews, refactoring initiatives, and knowledge-sharing within the team
- Take ownership of complex integrations and greenfield projects, translating ambiguous business requirements into production-ready solutions.
Titian Software
Senior Software Engineer
September 2021 - May 2024
- Acted as technical lead and Scrum Master for a cross-functional team enhancing Titian’s Mosaic sample management platform used by top Big Pharma companies
- Designed and evolved architecture and REST APIs, improving reliability, scalability, and interoperability with third-party vendor systems
- Led key modernization initiatives, including migration from TFVC to Git and Bugzilla to Azure DevOps, establishing new workflows, branching strategies, and automation pipelines
- Championed code quality and engineering best practices, conducting in-depth reviews, mentoring developers, and introducing .NET features to improve maintainability
- Drove process and delivery improvements in CI/CD and agile practices, working closely with QA, DevOps, and product management to increase deployment confidence and delivery cadence
- Served as a technical reference point company-wide, advising teams on integration design, API development, and debugging complex production issues
Titian Software
Software Engineer
August 2018 - August 2021
- Designed and implemented interfaces with external vendor systems, ensuring stable data exchange and system compatibility across distributed environments
- Collaborated with QA and product teams to deliver reliable solutions within agile sprints
- Participated in technical recruitment and internal IT support, contributing to infrastructure reliability and onboarding improvements
KRD BIG S.A.
Junior .NET Developer
September 2017 - November 2017
- Contributed to the development and maintenance of service-oriented .NET applications supporting one of Poland’s largest debt and credit information databases
- Assisted in implementing backend modules and optimizing existing components to improve performance and maintainability
- Gained first hands-on experience with enterprise software delivery, version control, and agile collaboration practices while completing BSc studies
Education
MSc Computer Systems Design
Wroclaw University of Science and Technology
March 2019 - July 2020
BSc Computer Science
Wroclaw University of Science and Technology
October 2015 - January 2019
Publications
Co-author of multiple articles and conference papers on Brain-Computer Interfaces and AI-based signal analysis.
(full list available on request)
Emerging Challenges in Intelligent Management Information Systems
2025
Towards Intelligent Human-Computer Interfaces: Simplified BCI for Subject Recognition
Rafal Chalupnik, Katarzyna Bialas
IEEE Transactions on Human-Machine Systems
2022
Multifactor Authentication System Using Simplified EEG Brain–Computer Interface
Katarzyna Bialas, Michal Kedziora, Rafal Chalupnik, Houbing Herbert Song
The 36th International Conference on Advanced Information Networking and Applications
Sydney, Australia
2022
Rafal Chalupnik, Katarzyna Bialas, Zofia Majewska, Michal Kedziora