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Yury Usishchev

Verified Expert in Engineering

ARM Developer

Moscow, Russia

Toptal member since November 14, 2016

Expertise

Linux Git C C++Tizen ARM Jira MongoDB MacOS OBS

Bio

Yury has four years of experience in toolchain-related development. He contributed a lot to Tizen platform and several patches were promoted to open-source projects like Binutils, Coreutils, and EFL. He has deep knowledge of system libraries (Glibc, RLTD) and toolchain parts (GCC, LLVM, Binutils). He has lots of experience in profiling, debugging, and single-line text processing.

Portfolio

Samsung R&D Center Russia

Open Broadcaster Studio (OBS), Git, LLVM, Clang, GCC, C++, C

Samsung R&D Center Russia

Open Broadcaster Studio (OBS), Git, AutoTools, CMake, RPM, GNU Debugger (GDB)...

Experience

Linux - 6 years
GNU Debugger (GDB) - 5 years
Git - 5 years
GNU Toolchain - 4 years
C - 4 years
C++ - 3 years
ARM - 2 years
LLVM - 1 year

Preferred Environment

Linux, MacOS

The most amazing...

...thing I've done is EFL software rendering optimization. I used NEON vector instructions/GCC intrinsics to speed up several pixel math operations.

Work Experience

Software Engineer

2015 - 2016

Samsung R&D Center Russia

Refactored the build acceleration system for ARMv7 and ARMv8 builds in Tizen OBS.
Enabled the first systemwide build with ASAN for Tizen. Fixed several bugs in Tizen and upstream codebase.
Reimplemented hot paths in EVAs using GCC intrinsics (same ~30% improvement but for AArch64).
Developed a set of tools based on Clang LibTooling for automatic symbol visibility reduction for Tizen.
Created several checkers for Clang Static Analyzer.

Technologies: Open Broadcaster Studio (OBS), Git, LLVM, Clang, GCC, C++, C

Junior Software Engineer

2013 - 2015

Samsung R&D Center Russia

Optimized hot paths in the EVAs library of EFL using inline vector assembly (up to 30% performance improvements).
Profiled lots of applications for Tizen platform optimization.
Prepared lots of packages for the OBS automated build bootstrap.
Supported several build projects on OBS for official AArch64 enabling in Tizen.
Prepared lots of patches and fixes for Tizen packages.

Technologies: Open Broadcaster Studio (OBS), Git, AutoTools, CMake, RPM, GNU Debugger (GDB), Valgrind, C

Experience

Tizen.org Account

Gerrit account where all Tizen-related work was done. See https://review.tizen.org/gerrit/#/q/owner:y.usishchev@samsung.com (Please note that a Tizen account is required for viewing).

Enlightenment Phabricator Account

This account was used for all EFL upstream contributions.

Sed: Calculator, Sorting, and Searching for Cycles in Graphs

https://github.com/jolfzverb/jolfzverb/tree/master/sed

Several Sed scripts written for non Sed-like tasks as a hobby.

Education

2007 - 2014

Master's Degree in Applied Mathematics and Physics

Moscow Institute of Physics and Technology - Moscow

Skills

Tools

Git, RPM, GNU Debugger (GDB), GNU Toolchain, Gerrit, GCC, CMake, AutoTools, Open Broadcaster Studio (OBS), Valgrind, Jira

Languages

C++, C, Bash, Sed

Platforms

Linux, Tizen, MacOS

Storage

MongoDB

Other

LLVM, Clang, ARM

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