Rafal Rojek

Package Delivery Rates and Times system Owned, designed, built and maintained microservices in the cloud Reduced API response time by introducing caching. Improved stability with retry mechanisms and circuit breakers Technologies: Java 21, Spring Boot, Spring WebFlux, REST API, PostgreSQL, Redis, Hibernate, Reactive Programming, Docker, Azure AKS, Github Actions, ELK stack for monitoring, Splunk

Package Delivery Rates and Times System , Support Portal Led two backend projects, managing the entire project lifecycle. Designed and owned highly available scalable backend microservices on Azure Designed REST APIs, NoSQL, SQL database solutions and 3rd party integrations Designed and implemented CICD pipelines, monitoring, metrics and alerting setups. Technologies: Java 17, Angular, Spring Boot, Spring Cloud, Spring WebFlux, Reactive Programming, REST API, Wiremock, Spock, ELK stack for monitoring

New booking system for Lufthansa, SWISS, Austrian Airlines Introduced reactive programming to improve handling of high traffic Mentored junior developers Improved monitoring and service downtime Techologies: Java 8, Spring/Spring Boot, Hibernate, MongoDB, Kafka, AMQ, Apache Camel, Linux OS, Microservices, REST API development, Docker, Logstash, Graylog, Prometheus, Grafana