Alexey Toptygin
Staff Software Engineer at Slack
Redwood City, California, United States
Summary
🤩
Rockstar🎓
Top SchoolAlexey Toptygin is a Staff Software Engineer with 20 years of experience building and hardening high-performance back-end systems, currently driving engineering work at Slack from Redwood City. He spent seven years at Facebook maintaining and optimizing HHVM, contributing focused refactors that removed legacy "ref cruft" and simplified core interpreter and type-handling code in a widely used open-source virtual machine. Prior roles across Bronto Software and Message Systems rounded out his systems and compiler-oriented expertise, grounded in a BS in Mathematics from the University of Maryland. Alexey combines deep low-level C++/runtime skills with a pragmatic eye for technical debt reduction and long-lived codebase health. Colleagues rely on him to make invasive cleanups safe and maintainable, turning subtle, risky refactors into measurable simplifications. He brings a quiet, methodical approach that favors long-term reliability over flashy short-term wins.
20 years of coding experience
16 years of employment as a software developer
BS Mathematics, BS Mathematics at University of Maryland
Github Skills (11)
code-optimization10
c-language10
refactoring10
cprogramming-language10
bytecode10
refactor10
optimization10
strings9
text-manipulation9
type-system9
memory-management8
Programming languages (5)
Github contributions (5)
facebook/hhvm
Dec 2016 - Nov 2022
A virtual machine for executing programs written in Hack.
Role in this project:
Back-end Developer
Back-end DeveloperContributions:660 commits, 6 PRs, 2 pushes in 5 years 11 months
Contributions summary:Alexey primarily focused on refactoring and cleaning up code related to the HHVM virtual machine, specifically addressing "ref cruft" stemming from the removal of references. Their work involved modifying core files such as interp-internal.h, type-variant.h and several .cpp files to streamline the system. These changes included the deletion of unused code related to bytecodes and helpers involved in string conversions, array operations, and handling of resource, and variable operations, streamlining the overall code base.
hacklangphpvirtual-machineprogramshhvm
alexeyt/hhvm.com
Apr 2022 - Nov 2022
The landing page for HHVM and the blog of Hack/HHVM
Contributions:13 pushes, 19 branches in 6 months
reactnextjshhvm
Find and Hire Top DevelopersWe’ve analyzed the programming source code of over 60 million software developers on GitHub and scored them by 50,000 skills. Sign-up on Prog,AI to search for software developers.