Juliusz Sosinowicz
Software Engineer at wolfSSL
Warsaw, Masovian Voivodeship, Poland
Summary
🤩
Rockstar🎓
Top SchoolJuliusz Sosinowicz is a software engineer with 7 years of hands-on experience building secure, performance-sensitive C and Python systems, currently developing wolfSSL’s TLS/DTLS and crypto libraries. He brings deep low-level expertise across Linux, x86 and ARM assembly, and has a Master’s in Computer Systems and Networks from Warsaw University of Technology. At wolfSSL he contributes to core security features and protocol implementations (including DTLS 1.3 examples and multi-connection servers), blending cryptography work with pragmatic embedded/IoT engineering. Earlier roles include full-stack integrations and telecom solutions—delivering a WebRTC/Asterisk VoIP call center integrated with Odoo CRM—showing his ability to bridge embedded, backend and application layers. Based in Warsaw, he combines academic rigor with a track record of shipping security-critical open-source code used from devices to the cloud.
7 years of coding experience
4 years of employment as a software developer
High School, High School at American School of WarsawMaster of Engineering - MEng, Computer Systems and Networks, Master of Engineering - MEng, Computer Systems and Networks at Warsaw University of Technology
English, Polish, French
Stackoverflow
1reputation
0reached
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Github Skills (16)
dtls10
it-security10
mtls10
ss10
embedded10
sslv310
ssl10
tls1210
c-programming10
tls1310
cryptography10
libtls10
security10
c119
c179
Programming languages (7)
Github contributions (5)
wolfSSL/wolfssl
May 2019 - Jan 2023
The wolfSSL library is a small, fast, portable implementation of TLS/SSL for embedded devices to the cloud. wolfSSL supports up to TLS 1.3 and DTLS 1.3!
Role in this project:
Back-end Security Engineer
Back-end Security EngineerContributions:1196 reviews, 603 commits, 365 PRs in 3 years 8 months
Contributions summary:Juliusz's contributions primarily focus on enhancing and optimizing the wolfSSL library's security features. Their commits involve implementing new encryption algorithms, improving existing ones, and adding support for features like session tickets and authentication mechanisms. The changes also include addressing potential security vulnerabilities, refactoring existing code to increase security, and incorporating enhancements for better performance.
trusted-execution-environmentdata-storageopenssl-apiwolfsslfhe
wolfSSL/wolfssl-examples
Jun 2022 - Jul 2022
Example applications using the wolfSSL lightweight SSL/TLS library
Role in this project:Embedded Systems Engineer / IoT Developer
Embedded Systems Engineer / IoT DeveloperContributions:48 reviews, 11 commits, 3 PRs in 1 month
Contributions summary:Juliusz focused on developing and refining example applications for the wolfSSL lightweight SSL/TLS library, specifically targeting DTLS (Datagram Transport Layer Security) 1.3. Their contributions include implementing DTLS 1.3 client and server examples, including a multi-connection server using libevent, and refactoring handshake timeout logic. The user also added functionality to use DTLS 1.2 via a USE_DTLS12 flag.
ssl-tlstlssslwolfsslcms
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