Mikko Lehto
Cyber Security Architect at Wärtsilä
Helsinki, Finland
Summary
🤩
Rockstar🎓
Top SchoolMikko Lehto is a Helsinki-based Cyber Security Architect with 13 years of hands-on experience designing secure, production-grade software across embedded, cloud, and industrial domains. He blends deep systems and networking expertise—from Linux and real-time embedded stacks to cloud product ownership—with leadership roles including CTO and Head of Engineering at a medtech startup. Mikko has a strong track record improving robustness in critical open-source infrastructure, contributing bug fixes and protocol hardening to the prominent Kamailio SIP server. Comfortable moving between low-level driver and protocol work and high-level security architecture, he’s known for pragmatic engineering that balances developer productivity with auditability. An uncommon thread in his career is long-term focus on communication stacks and protocol correctness, which now informs his security-first approach to system design.
13 years of coding experience
12 years of employment as a software developer
TKK
Finnish, English, Swedish
Github Skills (13)
c1710
debug10
sips10
c1110
software-quality10
sip10
sctp9
telephony9
tls139
voip9
libtls9
tls129
mtls9
Programming languages (5)
Github contributions (5)
kamailio/kamailio
Sep 2013 - Dec 2019
Kamailio - The Open Source SIP Server for large VoIP and real-time communication platforms -
Role in this project:
Back-end Developer
Back-end DeveloperContributions:320 commits, 58 PRs, 31 pushes in 6 years 4 months
Contributions summary:Mikko primarily contributed to the Kamailio SIP server by fixing bugs and improving the code quality. Their work involved addressing compile warnings, fixing typos, and resolving potential null pointer dereferences across various modules. The user also refactored and updated existing functions, including those related to SDP manipulation and the handling of different protocols, specifically the SCTP and TLS modules.
voltesip-serverkamailiofreeswitchchat
mslehto/dotfiles
Nov 2015 - Mar 2025
Contributions:57 pushes in 9 years 5 months
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