Denis Nedelyaev
Stony Stratford, England, United Kingdom
Summary
🤩
Rockstar🎓
Top SchoolDenis Nedelyaev is a Principal-level software engineer with 13 years of experience designing and implementing highly reliable, scalable distributed systems and clean architectures. He pairs deep, low-level knowledge of computer systems with hands-on technical leadership—driving major performance gains such as page load times from seconds to milliseconds and slashing CI times by an order of magnitude. His background spans mission-critical big data at Yandex, database internals and corruption fixes at JetBrains (contributing to Xodus), and full-stack product delivery using modern stacks like React/Relay and GraphQL. An active open-source contributor, he’s fixed subtle coroutine leaks and improved cleanup semantics in Facebook’s Folly library and made robustness and memoization fixes in Relay. Comfortable as a sole engineer or as an architect-led team mentor, he’s known for finding hard-to-see issues and turning them into practical, production-safe solutions.
13 years of coding experience
13 years of employment as a software developer
Master's degree, Computer Science, Master's degree, Computer Science at Russian State University of Trade and Economics
Russian, English
Stackoverflow
4,271reputation
368kreached
61answers
3questions
mysql
top-5%
doctrine-orm
top-5%
full-text-search
top-5%
symfony
top-5%
Github Skills (47)
kotlin10
asynchronous10
javascript10
c-language10
performance-monitor10
performance-analytics10
async10
testing10
lmdb10
hacking10
databases10
wpgraphql10
hhvm10
java10
performance-measurement10
Programming languages (8)
Github contributions (5)
JetBrains/xodus
Mar 2017 - Sep 2017
Transactional schema-less embedded database used by JetBrains YouTrack and JetBrains Hub.
Role in this project:
Database Engineer / Database Administrator
Database Engineer / Database AdministratorContributions:14 commits, 5 PRs, 32 pushes in 5 months
Contributions summary:Denis primarily focused on benchmarking and optimizing the performance of the embedded database, Xodus, by comparing it to LMDB and Tokyo Cabinet. Their contributions include implementing benchmarks for read and write operations, including successive and random access patterns. They also added options for performance improvements, and fixed potential data corruption issues by correctly synchronizing directory and log files.
embedded-databaseyoutrackschema-lessjdbcentity-store
facebook/relay
Dec 2015 - Aug 2016
Relay is a JavaScript framework for building data-driven React applications.
Role in this project:Full-stack Developer
Full-stack DeveloperContributions:11 commits, 17 PRs, 96 comments in 8 months
Contributions summary:Denis made several contributions focused on the Relay framework, a JavaScript framework for building data-driven React applications. Their work involved modifying core components, addressing issues related to memoization and immutability within the `toGraphQL` function. They also fixed variables for implicit fragments and made changes to the RelayContainer, RelayNetworkLayer, and RelayRenderer components. Furthermore, they updated tests and made changes to ensure queries run after mount.
data-drivenreactrelayreact-applicationsjavascript-framework
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.