Oleg S
Consultant at Seres Therapeutics
Washington DC-Baltimore Area United States
Summary
🤩
Rockstar🎓
Top SchoolOleg S is a seasoned systems and backend engineer with 11 years of experience building and migrating high-performance, regulated scientific computing platforms to the cloud. Based in the Washington DC–Baltimore area, he blends deep low-level expertise—shown by contributions to Capstone disassembly, lz4 compression internals, and OpenSSH—with practical systems work managing thousands of AWS instances and retiring on-prem research infrastructure at Seres Therapeutics. A tinkerer at heart (Z80 → AMD64 → ARM), he brings strong reverse-engineering and embedded-firmware skills demonstrated by his work on Xiaomi router firmware and OpenWrt tooling. Comfortable across Linux, networking, and secure tooling, he’s equally at home refactoring hardcore C data structures as automating cloud migrations in regulated environments.
11 years of coding experience
11 years of employment as a software developer
University of Plovdiv "Paisii Hilendarski"
English, French, Bulgarian, Russian
Github Skills (58)
algorithm10
debugging10
algorithms10
debug10
assembly10
c-language10
system-programming10
qt10
python10
scripting10
wp-api10
windows10
firmware10
openssh10
winapi10
Programming languages (10)
Github contributions (5)
openwrt-xiaomi/xmir-patcher
Oct 2021 - Oct 2022
Firmware patcher for Xiaomi routers
Role in this project:
Back-end Developer & Embedded Systems Engineer
Back-end Developer & Embedded Systems EngineerContributions:102 commits, 1 PR, 254 pushes in 11 months
Contributions summary:Oleg primarily worked on firmware patching for Xiaomi routers, focusing on reverse engineering and modification of the firmware to enable specific features. They implemented support for installing custom firmware, including OpenWrt factory images, and integrated tools for converting and uploading language files. Their contributions involved modifying existing scripts and creating new ones to enable SSH access and other utilities, demonstrating a strong understanding of router firmware internals and networking. The user also demonstrated skills in build and release automation by separating payload into 3 parts and including all the necessary components.
exploitfirmwareinstallerpatchrouter
lz4/lz4
Mar 2017 - Oct 2020
Extremely Fast Compression algorithm
Role in this project:Back-end Developer
Back-end DeveloperContributions:8 reviews, 10 commits, 10 PRs in 3 years 7 months
Contributions summary:Oleg contributed to the lz4 library by cleaning up and refactoring core compression functions such as `LZ4HC_compress_hashChain` and `LZ4HC_encodeSequence`. Their work involved optimizing compression and adding new functionality related to output size control, specifically the `LZ4_compressHC_destSize` function. Additionally, the user added and tested the `LZ4_compressHC_destSize` function with a fuzzer. These changes indicate a focus on improving the library's efficiency, correctness, and flexibility.
compressioncompression-algorithmlz4c
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