Frederic Jean - Senior Staff Software Engineer at BNSF Railway

Frederic Jean

Senior Staff Software Engineer at BNSF Railway

Massachusetts, United States

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Summary

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Rockstar

🎓

Top School

Frederic Jean is a Senior Staff Software Engineer with 25+ years building and operating large-scale distributed backend platforms, currently shaping telemetry infrastructure for BNSF Railway. He led a diagnostics and decision platform at AWS that delivered $3B in cumulative free cash flow and designed hybrid cloud-to-data-center infrastructure bridging VPCs with physical networks. His career spans distributed systems, microservices, event-driven architectures, container orchestration, CI/CD, observability, and security, with hands-on expertise in Java/Kotlin, Python, AWS, Kubernetes, Kafka, and Terraform. He has scaled email processing to 400K messages per minute, built consumer-facing services for millions at Disney MoviesAnywhere, and consolidated enterprise systems at Sun that saved millions. An active open-source contributor, he has contributed deep JVM runtime work to OpenJDK (Valhalla and JDK field-layout changes), reflecting uncommon expertise in language/runtime internals for an infrastructure-focused engineer. Bilingual in English and French, he combines technical leadership, mentoring, and a strong focus on developer experience and sustainable platform engineering.

16 years of coding experience

21 years of employment as a software developer

BS, Management Information Systems, BS, Management Information Systems at Ambassador University

University of Denver

English, French

Github Skills (11)

javas10

openjdk10

jvm10

interpreter10

datatypes10

primitive-types10

java10

garbage-collection9

cprogramming-language9

c-language9

memory-management8

Programming languages (1)

Java

Github contributions (5)

openjdk/valhalla

Sep 2017 - Sep 2022

https://openjdk.org/projects/valhalla

Role in this project:

Back-end Developer

Contributions:170 reviews, 127 commits, 144 PRs in 4 years 11 months

Contributions summary:Frederic primarily contributed to the implementation of value types within the OpenJDK Valhalla project. Their work focused on adding support for inline fields within the interpreter and related runtime components. They addressed issues involving bytecode rewriting, class file parsing, and the handling of flattened fields, including improvements to memory management and garbage collection integration. The user also implemented test cases to verify the correct handling of value types in various scenarios.

openjdkjavavalhalla

openjdk/jdk

Oct 2020 - Apr 2025

JDK main-line development https://openjdk.org/projects/jdk

Role in this project:

Back-end Developer

Contributions:99 reviews, 7 PRs, 51 comments in 4 years 6 months

Contributions summary:Frederic primarily focused on modifying the field layout builder within the OpenJDK project. Their contributions involved overhauling field layout computation, addressing assertion failures related to contended padding, and refactoring code related to field metadata. Furthermore, the user made changes related to removing obsolete code and updating the handling of instance layout, demonstrating a deep understanding of the Java Virtual Machine internals. The changes included both structural and performance related changes within the codebase.

openjdkjavajvmjdk

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