Mikael Johansson
Founder And Consultant at Heapify AB
Stockholm, Sweden
Summary
👤
Senior🎓
Top SchoolMikael Johansson is a founder and consultant with 11 years of hands-on experience building low-latency, fault-tolerant trading systems and order management platforms across banks, brokers and exchanges. He has driven production-grade implementations at UBS, Nasdaq and Millennium and has deep expertise in core Java, network programming, event-sourced architectures and sequencer-based systems. Mikael’s work spans both front-end trading GUIs and low-level IPC and market connectivity, including contributions to the popular mappedbus Java library for high-performance inter-process communication. Based in Stockholm with an MSc from KTH, he blends entrepreneurial initiative—founding Caplogic and now Heapify—with day-to-day technical ownership of latency-sensitive financial infrastructure. Colleagues rely on him for pragmatic performance tuning and for turning complex market protocols into reliable, production systems.
11 years of coding experience
19 years of employment as a software developer
Master of Science (M.Sc.) Information and Communication Technology, Master of Science (M.Sc.) Information and Communication Technology at KTH Royal Institute of Technology
Github Skills (5)
performance-testing10
javas10
java10
testing10
concurrency9
Programming languages (2)
Github contributions (2)
caplogic/Mappedbus
May 2015 - Oct 2022
A library for low latency IPC between multiple Java processes/JVMs. http://mappedbus.io
Role in this project:
Back-end Developer
Back-end DeveloperContributions:6 releases, 55 commits, 1 PR in 7 years 6 months
Contributions summary:Mikael primarily focused on improving the `mappedbus` library, designed for low-latency inter-process communication in Java. Their work involved performance testing, which included updating the `MessageReader` and `MessageWriter` classes. They also addressed a critical bug related to the `next()` method and refactored the code related to writing to the memory mapped file. Furthermore, they added comprehensive tests to ensure the reliability of the library.
latencyjnammapipcjava
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