Jan – Java, React, Spring

The project involved developing a new microservice-based e-commerce platform for online shops, replacing the legacy system. The platform was initially deployed in Czechia, followed by Austria, with plans for further rollouts across Europe.

• Engaged in architectural decision-making processes;
• Led a code quality and maintainability initiative and was a key member of a task force tackling urgent performance issues before our successful launch in Austria;
• Developed and introduced a "Deploy Buddy" tool, offering a tailored, one-click overview to facilitate safe and reliable deployments across various services and environments;
• Developed new features and tests and fixed bugs;
• Operated in a fully remote environment, with occasional travel to Vienna for collaborative purposes.

The project at DHL IT Services involved developing and maintaining two internal applications: a Java Spring Boot user management application used across various DHL applications, which included implementing new features and fixing bugs, and a predictive analytics software for warehouse operations.

• Initiated the rewrite process from pure JavaScript to TypeScript;
• Executed the complete rewrite, resulting in significant improvements in code maintainability and readability.

The project involved enhancing a Java Spring Boot application for the Collaboration Hub project at a major pharmaceutical company. Its primary focus was on developing new features and resolving bugs. This project played a crucial role in aggregating and presenting "value evidence" documents, supporting value-based healthcare.

• Developed new features and resolved bugs;
• Presented new features to stakeholders.

A healthcare management application designed to foster managed care techniques that ultimately reduce healthcare costs while maintaining the quality of care.

• Led performance analysis and optimization, mostly focusing on SQL Server internals and Java;
• Achieved successive promotions from a Performance Engineer Team Lead to the esteemed role of Deputy General Manager;
• Managed teams across Prague and Boston, overseeing performance and scalability;
• Initiated and directed the development of an automated performance testing pipeline for REST web services;
• Integrated performance engineering workflow with the company-wide Scrum process;
• Achieved significant performance enhancements, including an 85% increase in supported concurrent users, and maintained 100% SLA compliance for screen response times;
• Optimized release testing report processes, increasing efficiency;
• Directed engineering teams and led recruitment efforts;
• Resolved critical production issues and addressed long-term performance challenges;
• Mentored team members, guiding their professional growth.