@ykrupin

Hi there, I'm Yevhen 👋🏻

Author of code that fuels the very heart of Amazon's infrastructure . Experienced software engineer focused on delivering reliable, tested, high-performance solutions. Equally effective as a collaborative team player and as an individual contributor.

With over a decade of experience, I have developed deep expertise in:
Java 8-21 (JDK, JVM internals, Spring Boot, Async Profiler), .NET (C#, WPF, ASP.NET, Xamarin), C++, TypeScript, React, AWS, Google Cloud, relational and NoSql databases.

I speak three languages:
Ukrainian, English and French.

Let's Connect

Please, feel free to reach out to me, I am always available for interesting projects and consulting.

Work Experience
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  • Jan2023 - current
    AWS @ Languages and Runtimes, Ireland
    Software Development Engineer

    Technologies: Java 8-21, C++, AWS, Async Profiler, Amazon Profiler, JCK, JTreg, JUnit, internal Amazon tools.

    • Developed a runtime enabling 4.5K services across more than 2.6MM hosts to run on the latest LTS JVM without any code change;
    • Secured upgrade of services handling 350MM+ requests per day, increasing TPS by 13-20%, reducing GC time by 30-80%, CPU utilization by 10-30% and latency by 15-25%;
    • Maintained operational excellence by performing Correction of Error (CoE) and Operational Readiness Review (ORR) processes;
    • Coached junior engineers through pair-programming and delivered technical documentation improving onboarding for new members;
    • Enhanced automated testing solutions and improved build infrastructure;
  • Mar2020 - Dec2022
    CERN, Switzerland
    Senior Fellow/Software Engineer

    Technologies: Java 11, Spring Boot, TypeScript, React, Oracle SQL, JDBC, JPA, Liquibase, Keycloak, Junit, Mockito, Docker.

    • Delivered and maintained document handling service (processing 500K documents/year), recruitment systems, CERN phone book (1500+ unique daily visits);
    • Automated HR and recruitment processes, handling 3,000+ registrations per year;
    • Enhanced software quality and processes through agile practices, pair programming, refactoring etc;
    • Mentored junior engineers and colleagues;
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