Olle Johansson
Software Engineer at Edvina AB - edvinanet
Sollentuna kommun, Stockholm County, Sweden
Summary
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RockstarOlle Johansson is a software engineer with 20 years’ experience specializing in real-time communication, SIP/VoIP systems, and software supply chain security. Based in Sollentuna, Sweden, he contributes deep protocol expertise to major open-source projects like Kamailio and Asterisk, improving core SIP parsing, connection state handling, and documentation tied to RFC standards. He is active in standards and security communities (IETF, OWASP) and brings practical PKI and secure-comm knowledge to production-grade back-end systems. Olle’s work often focuses on low-level reliability and maintainability—refactoring core libraries, adding RPC management commands, and clarifying protocol implementation through precise docs and comments. Colleagues rely on him for pragmatic fixes that reduce complexity while keeping systems interoperable at scale.
20 years of coding experience
Swedish, English
Stackoverflow
41reputation
6kreached
8answers
0questions
Github Skills (22)
sipjs10
c-programming10
networking10
sip10
sips10
sipp10
mysql9
debug9
debugging9
database-design9
documentation9
code-formatting8
openssl8
api-design8
system-programming8
Programming languages (17)
Github contributions (5)
asterisk/asterisk
Dec 2005 - Apr 2015
The official Asterisk Project repository.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:1639 commits in 9 years 6 months
Contributions summary:Olle's commits primarily focused on the formatting and addition of documentation and comments to the chan_sip.c file within the Asterisk project, specifically related to the Session Initiation Protocol (SIP) channel driver. The changes suggest a focus on improving code readability and maintainability by incorporating better documentation and code formatting practices. There are also references to various RFC standards such as RFC3261, which suggests a deep knowledge of the protocol.
pythonasterisklinuxpbxsip
kamailio/kamailio
Oct 2009 - Dec 2022
Kamailio - The Open Source SIP Server for large VoIP and real-time communication platforms -
Role in this project:Back-end Developer
Back-end DeveloperContributions:33 reviews, 944 commits, 14 PRs in 13 years 4 months
Contributions summary:Olle's contributions are primarily focused on the core functionalities of the Kamailio SIP server. Their work involves modifications to both core functionalities and supporting libraries, with a focus on low-level components, including enhancements to the message parsing mechanism, the addition of connection state, and enhancements to existing database support and integration. The commits consistently implement improvements and bug fixes while also restructuring existing code. The user has also contributed new RPC commands for enhanced management and interaction with the server and modules.
voltesip-serverkamailiofreeswitchchat
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