Christoph John
QuickFIX J Maintainer And Main Committer at Foconis MACD
Aachen, North Rhine-Westphalia, Germany
Summary
🤩
Rockstar🎓
Top SchoolChristoph John is a seasoned Java and JEE engineer with over 14 years of hands-on experience and two decades of domain expertise in Linux and financial messaging protocols. As the main committer and long-time maintainer of QuickFIX/J, he has shaped the official FIX engine—implementing core session logic improvements and extensive test automation that boost reliability in production trading systems. A member of the FIX Global Technical Committee, he combines protocol-level know-how (FIX, SBE, SWIFT, MoldUDP64) with pragmatic architecture ownership at Foconis MACD. Based in Aachen, he balances deep technical craftsmanship with stewardship of a widely used open-source project, often tackling subtle edge cases like negative heartbeat handling and sequence recovery. Colleagues rely on him for durable, well-tested fixes that keep high-throughput messaging systems stable under stress.
14 years of coding experience
Diplom-Informatiker (FH) Informatik, Diplom-Informatiker (FH) Informatik at Hochschule Merseburg
German, English
Stackoverflow
3,098reputation
89kreached
118answers
2questions
Github Skills (12)
unit-testing10
javas10
error-handling10
java10
fixprotocol10
test-automation10
finance9
payara6
jakartaee6
quickfixj6
quickfix6
glassfish6
Programming languages (5)
Github contributions (5)
quickfix-j/quickfixj
Nov 2011 - Jan 2023
QuickFIX/J is a full featured messaging engine for the FIX protocol. - This is the official project repository.
Role in this project:
Back-end Developer & Test Automation Engineer
Back-end Developer & Test Automation EngineerContributions:12 releases, 126 reviews, 648 commits in 11 years 3 months
Contributions summary:Christoph primarily focused on enhancing the functionality and reliability of the QuickFIX/J engine. Their contributions included implementing features like rejecting logon messages with negative heartbeat intervals and handling missing sequence numbers, which involved modifications to the core session logic. The user also provided extensive unit tests and acceptance tests, ensuring the correct behavior of the system by adding test scripts for various scenarios, particularly related to error handling and message processing.
fixprotocolfull-featuredfixprotocolfix-protocol
chrjohn/grpc-reset-reproducer
Oct 2019 - Nov 2023
reproducer for issue https://github.com/grpc/grpc-java/issues/6323
Contributions:4 PRs, 9 pushes, 4 branches in 4 years 2 months
javagrpcgrpc-javaprotobuf
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