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Krzysztof Wlezień

@krzysztofwlezie

Senior Java Engineer at PEKAO BANK, implementing customer authorization across banking processes and Kafka mortgage processing integrations.

Poland

Message

At PEKAO BANK, I implemented a new customer authorization method for bank staff across core library changes and business processes. I designed the data model and functions with a business analyst, and integrated mortgage task processing with an external service using Kafka.

At NORDEA, I contributed to re-architecting a banking monolith into microservices and worked on non-blocking services using Reactor and Kafka. Earlier, I created microservices for Polish emergency medical services at GABOS and delivered an application from scratch at WARTA.

Experience

Work history, roles, and key accomplishments

Senior Java Engineer

Pekao Bank

Jan 2024 - Oct 2026 (2 years 9 months)

Implemented a new customer authorization method for bank staff, involving core library changes and integration across dozens of business processes. Designed data models and functions in collaboration with a business analyst, and integrated mortgage task processing with an external service using Kafka.

Java 17 25 Spring Boot Microservices GCP Kafka Grafana Apache POI

Senior/Lead Java Engineer

Nordea

Mar 2021 - Sep 2025 (4 years 6 months)

Re-architected a monolithic application into microservices architecture used by 9 million bank users. Built non-blocking services with Reactor and Kafka capable of handling 400,000 requests per second.

Java 8 11 17 Spring Boot Microservices Junit Cucumber JMeter Reactor Kafka

Java Developer

Gabos

Jun 2020 - Feb 2021 (8 months)

Created new services with microservices architecture for Polish emergency medical services serving the country's 38 million inhabitants.

Java 11 Java FX Spring Boot Liquibase Oracle Kafka

Java Developer

Sabre - Airline Solutions

Sep 2019 - Mar 2020 (6 months)

Worked on the GetThere project, adding features and fixing bugs. Developed webservices/mock and unit tests, applying design patterns and good coding practices.

Java 8 11 Web Services Unit Testing Design Patterns

Java Developer

Warta - Insurance Company

Mar 2018 - Aug 2019 (1 year 5 months)

Added functionalities to existing Java-based applications and designed an application from scratch that was delivered to production, including artificial intelligence for automatic damage decisions based on parameters.

Spring Boot MyBatis Angular Python Java 8 11