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Jan – Java, React, Spring, experts in Lemon.io

Jan

From Czech Republic (GMT+2)

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Full-stack Web DeveloperSenior
Front-end Web DeveloperSenior
Back-end Web DeveloperSenior
Hire developer
22 years of commercial experience
E-commerce
Healthcare
Logistics
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Jan – Java, React, Spring

Jan is a Senior Full-stack professional with extensive experience in Java, React, and additionally, Kotlin. His expertise spans diverse domains such as logistics, healthcare, and e-commerce. With 6 years of leadership experience, he has progressed from a developer to a manager and eventually to a director, managing teams across Europe and the US. With Jan's extensive expertise and leadership experience, he will definitely bring immense value to any company.

Main technologies
Java
10 years
React
5 years
Spring
10 years
Additional skills
Kotlin
SQL
Java Reactive
Spring Boot
Spring WebFlux
Redux
Apollo GraphQL
Microsoft SQL Server
JUnit
Protractor
RxJS
Rewards and achievements
Big tech veteran
Ready to start
ASAP
Direct hire
Potentially possible

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Experience Highlights

Senior Software Engineer (Back-End)
Sep 2022 - Jan 20241 year 4 months
Project Overview

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.

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Responsibilities:
  • 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.
Project Tech stack:
Java
Kotlin
Java Reactive
Spring Boot
Spring WebFlux
Senior Software Engineer (Full-Stack)
Mar 2021 - Jul 20221 year 4 months
Project Overview

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.

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Responsibilities:
  • Initiated the rewrite process from pure JavaScript to TypeScript;
  • Executed the complete rewrite, resulting in significant improvements in code maintainability and readability.
Project Tech stack:
Java
React
Apollo GraphQL
Redux
Spring Boot
Senior Software Engineer (Full-Stack)
Dec 2019 - Feb 20211 year 2 months
Project Overview

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.

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Responsibilities:
  • Developed new features and resolved bugs;
  • Presented new features to stakeholders.
Project Tech stack:
Java
React
Redux
Spring Boot
Performance Engineer Team Lead, Deputy GM, Director of Performance Engineering
Jun 2011 - Sep 20198 years 3 months
Project Overview

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

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Responsibilities:
  • 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.
Project Tech stack:
Java
Spring
Microsoft SQL Server

Education

2010
Economics and Management
MSc
2008
Programming, Computer Science
BSc

Languages

English
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