Mikko Karjalainen
Software Engineer at Apple
London, England, United Kingdom
Summary
👤
Senior🎓
Top SchoolMikko Karjalainen is a seasoned software engineer with 11+ years building high-performance, business-critical distributed systems across telecom, datacom and payments domains. He specializes in Java networking (Netty), functional reactive programming (Reactor, RxJava), multithreading and low-latency design, with deep C and Python experience rooted in the GNU/Linux and POSIX ecosystems. His background includes protocol-level telecom work (GTP-U, PDCP, RRC) and cloud platform security and forwarding infrastructure at Cisco, alongside more recent payments engineering at Apple. Comfortable across languages and paradigms—Scala, Objective‑C, parser generators (flex/bison, ANTLR)—he brings a pragmatic systems mindset to complex backend challenges. Colleagues know him for translating protocol and performance requirements into robust, production-ready implementations.
11 years of coding experience
17 years of employment as a software developer
MSc Computer Science, MSc Computer Science at University of ReadingBachelor of Engineering Software and Telecom Engineering, Bachelor of Engineering Software and Telecom Engineering at Jyvaskyla Polytechnic
English, Finnish
Github Skills (17)
asynchronous10
application-framework10
reverse-proxy10
jvm10
netty10
http10
proxy10
java10
event-driven10
nio10
load-balancer10
histogram9
hdr8
python6
admin1
Programming languages (3)
Github contributions (5)
mikkokar/styx
Oct 2017 - Jul 2020
Programmable, asynchronous, event-based reverse proxy for JVM.
Contributions:3 releases, 4 PRs, 992 pushes in 2 years 9 months
asynchronousproxyreverse-proxyjvmprogrammable
mikkokar/hdr-plotter
Mar 2018 - Jul 2019
Contributions:2 pushes, 1 branch in 1 year 4 months
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