Who am I?

Profficient fullstack developer who gained experience in technology & financial industry.

Contacts & links

• Linkedin: https://www.linkedin.com/in/tomasz-p%C3%B3%C5%82grabia-a0944136/
• E-mail: tomasz at polgrabia point me
• XMPP / Jabber: tomasz point polgrabia at mailbox point org
• Repository: https://code.polgrabia.me/tomasz

Technologies

In the beginning of my IT career, I started as a JEE developer. It was a heavy, hard-to-use technology but anyways used in most companies. Because of this hard-to-use, I learnt how to bypass a long process of constant redeployments, just by writing much quicker unit-tests. Unintentionally, it lead me to writing better code as I started to think how to write a testable code. After many years in the industry, I switched to more light-weight web and integration technologies like spring and vertx but the very same techniques of writing code are ironically very up-to-date even though the underlying technology went obsolete or not recommended anymore.

Backend technologies

• Java SE + EE
• JSF
• JPA, EJB, Message Driven Beans
• Spring
• Vertx

Frontend technologies

• Javascript
• Reasonable knowledge of flow & Typescript
• Gulp & Webpack
• React
• Vue

Career

# April 2025 - Present

Visa Europe Technology AG in Warsaw PL

• Designed and developed a Spring Batch risk monitoring solution for eCheck transaction return and merchant processing.
• Co-developed Apache Kafka streaming services supporting eCheck transaction processing.
• Built internal MCP integrations with Kubernetes, Grafana, OpenSearch and ChromaDB, enabling AI coding assistants to access operational, monitoring and diagnostics data.
• Driving GenAI-enhanced CI/CD and internal developer platform tools, and managed Kubernetes deployments across production and non-production environments.

# August 2022 - November 2024

UBS Business Solutions AG in Zurich CH

• Developed and maintained backend APIs for asset management, handling accounts, transactions, and portfolio management functionalities.
• Maintained and implemented new features for multi-banking solutions, enabling secure and seamless account aggregation across multiple banks using EBICS (Electronic Banking Internet Communication Standard).
• Led DevOps initiatives, optimizing CI/CD pipelines and ensuring smooth deployment processes across development, QA, and production environments.
• Configured and maintained Jenkins pipelines using Jenkinsfiles, automated infrastructure provisioning, and managed deployment scripts via Ansible.
• Implemented application performance monitoring with AppDynamics, identifying and resolving performance bottlenecks.
• Provided pre-release support, troubleshooting deployment issues, debugging failures, and ensuring smooth releases with minimal downtime.

# March 2021 - July 2022

IBM Client Innovation Center in Bern CH

• Maintained and enhanced the backend for the form exchange system, improving data validation, API performance, and system reliability.
• Developed new frontend features for a government document exchange system, enhancing usability and compliance with accessibility standards.
• Automated infrastructure provisioning using Ansible and Jenkins, ensuring seamless updates and reducing manual maintenance efforts in development and QA environments.

# February 2020 - February 2021

Luxoft Excelian in Bern CH

• Designed and implemented an ELK Stack-based monitoring solution, creating real-time dashboards with visualized application performance metrics.
• Integrated OpenBanking XS2A APIs, enabling third-party financial institutions to securely access user account data in compliance with the Berlin Group Standard.
• Developed a responsive, mobile-friendly UI for an existing banking platform using React, improving user experience and engagement

# March 2017 - January 2020

Goldman Sachs in Warsaw PL

• Integrated OTC trading platforms with internal quoting systems, utilizing FIX protocol to enhance market data exchange and trade execution.
• Automated IT infrastructure monitoring for financial data integrity, reducing operational risks and increasing data accuracy.
• Provided real-time production support during London market hours, resolving system issues and assisting in end-of-day data reconciliation processes

# October 2015 - February 2017

Unicredit Business Integrated Solutions in Warsaw PL

• Developed and maintained the CVA Web Console, a financial risk analytics platform used by institutions to assess credit risk exposure.
• Designed and implemented an in-house monitoring system for banking processes, automating Jenkins- based CI/CD workflows to enhance operational efficiency.

# November 2013

Centralny Ośrodek Informatyki in Warsaw PL Development of CEPIK2 (central records of vehicles and drivers) - CEK and Resper projects.

# July 2013

Comarch in Warsaw PL - Public government project - development of EPUAP2 project.