Dmitriy Kovalenko

Member of Technical Staff

Contact

Skills

Languages

Rust, C, Java/Scala, TypeScript/JavaScript

Front-end

React, JavaScript, TypeScript, Vite, CSS, tailwindcss

Back-end

Rust (actix-web, warp), C (fastcgi, cgi), NodeJS (nestjs, fastify, express), OCaml (Dream), Rust (warp, juniper), GraphQL, PostgreSQL, Redis, Nginx

Data

Apache Spark, Kafka, Flink, Hadoop, Airflow

ML Ops

MLflow, Kubeflow, Feature stores, Model serving (Triton, TorchServe), Ray, Vector DBs (pgvector, turbopuffer), Observability (Prometheus, Grafana), CI/CD for models

Tools

Claude Code, OpenCode, Conductor, Docker, GitHub, Neovim, ...and many more

Languages

EnglishAdvanced · C1

GermanIntermediate · B1

UkrainianNative · C2

RussianNative · C2

Education

Computer Science

Kharkiv Computer and Technology College — Ukraine

2013 – 2017

Profile

Performance engineer with over a decade of experience optimizing software and building systems. Now working on Codex at OpenAI. Author of popular open-source tools (fff, odiff) and core collaborator on industry-leading projects including Material-UI, Cypress.io, React Native, and FFmpeg. Leading expert in performance optimization for any kind of system: SIMD, GPU acceleration, native real-time processing pipelines, and distributed systems performance tuning. Applying AI tools at scale and implementing top-performing AI-native products. Passionate about shaping my own agentic AI toolset to produce the most qualified software solutions and amazing products for users.

Work Experience

Member of Technical StaffAugust 2026 – Present

OpenAI

Codex harness engineer. Making codex fast and efficient!

Founding Software EngineerMay 2021 – August 2026

LightSource.ai

Founding engineer at a procurement-automation startup. Designed and built the core platform end-to-end: web app, backend, data pipelines, and infrastructure. Drove technical direction and deep product involvement.

Senior Software EngineerSeptember 2020 – May 2021

Cypress.io

Returned to Cypress to lead the launch of Component Testing.

Cypress Component Testing. Author and lead architect of Cypress Component Test Runner (https://www.cypress.io/blog/2021/04/06/introducing-the-cypress-component-test-runner/). Designed the runtime, dev-server integration, and public API adopted by thousands of teams.
TypeScript · React · MobX · Node.js

Senior Software EngineerJanuary 2020 – September 2020

Material-UI

Core collaborator & owner of date/time picker components with millions of weekly downloads. Drove accessibility, localization, and API design.

Senior Software EngineerMay 2019 – January 2020

Cypress.io

Shipped features across the Cypress test runner and dashboard: authoring, designing, and testing end-to-end product workflows used by millions of developers.

Software EngineerApril 2016 – May 2019

Nix Solutions

Full-stack JavaScript engineer and team lead. Owned architecture, delivery, and code quality across multiple client projects.

Credit-union / customer matching platform. Built front-end and back-end modules; designed matching and reporting subsystems.
.NET · ASP.NET MVC · React · jQuery · D3 · Bootstrap
Bus and train ticketing platform. Led front-end feature delivery and code review.
Angular · TypeScript · Karma · Jasmine · Bootstrap
Slide-synced video playback for a video-hosting platform. Designed and implemented the full application architecture.
React · Redux · SCSS · Redux-Thunk · S3 · Mocha · Karma
Multi-platform chat-bot for workflow automation and reporting. Designed and built the full system end-to-end.
Node.js · TypeScript · Jest · Now · Docker
Systems health monitoring and analytics platform. Led the front-end sub-team; owned front-end architecture and contributed to back-end services.
React · Flow · Redux · Redux-Thunk · SCSS · Node.js · Express · Sequelize · Socket.IO · PostgreSQL · Redis · Nginx · Jest · Mocha
B2B integrations and advertising platform. Technical lead. Drove product architecture and delivery.
React · MobX · TypeScript · CSS-in-JS (JSS) · Formik · Node.js · Koa · TypeORM · Inversify · Jest · Cypress · Docker

Software Engineering internJune 2015 – December 2015

Syject

Individual contributor to the large-scale, high-traffic web application for courier delivery.

Customer-to-customer delivery service. Back-end and front-end development.
.NET · ASP.NET MVC · MySQL · Bootstrap · D3

Dmitriy Kovalenko

Member of Technical Staff

Education

Computer Science

Kharkiv Computer and Technology College — Ukraine

2013 – 2017

Work Experience (continued)

Senior Software EngineerMay 2019 – January 2020

Cypress.io

Shipped features across the Cypress test runner and dashboard: authoring, designing, and testing end-to-end product workflows used by millions of developers.

Software EngineerApril 2016 – May 2019

Nix Solutions

Full-stack JavaScript engineer and team lead. Owned architecture, delivery, and code quality across multiple client projects.

Credit-union / customer matching platform. Built front-end and back-end modules; designed matching and reporting subsystems.
.NET · ASP.NET MVC · React · jQuery · D3 · Bootstrap
Bus and train ticketing platform. Led front-end feature delivery and code review.
Angular · TypeScript · Karma · Jasmine · Bootstrap
Slide-synced video playback for a video-hosting platform. Designed and implemented the full application architecture.
React · Redux · SCSS · Redux-Thunk · S3 · Mocha · Karma
Multi-platform chat-bot for workflow automation and reporting. Designed and built the full system end-to-end.
Node.js · TypeScript · Jest · Now · Docker
Systems health monitoring and analytics platform. Led the front-end sub-team; owned front-end architecture and contributed to back-end services.
React · Flow · Redux · Redux-Thunk · SCSS · Node.js · Express · Sequelize · Socket.IO · PostgreSQL · Redis · Nginx · Jest · Mocha
B2B integrations and advertising platform. Technical lead. Drove product architecture and delivery.
React · MobX · TypeScript · CSS-in-JS (JSS) · Formik · Node.js · Koa · TypeORM · Inversify · Jest · Cypress · Docker

Software Engineering internJune 2015 – December 2015

Syject

Individual contributor to the large-scale, high-traffic web application for courier delivery.

Customer-to-customer delivery service. Back-end and front-end development.
.NET · ASP.NET MVC · MySQL · Bootstrap · D3

Notable Open Source Work

github.com/dmtrKovalenko →

fffAuthor★ 6k

High-performance file search toolkit. Frecency-ranked results, sub-millisecond search across massive codebases. Used by millions people every day.

Rust · Assembly

github.com/dmtrKovalenko/fff

odiffAuthor★ 3k

Fastest pixel-by-pixel image diffing tool. Powers millions of screenshot comparisons under the hood of every major visual regression testing pipeline.

Zig · C

github.com/dmtrKovalenko/odiff

Material-UICore Contributor★ 100k

Core contributor to Material-UI up to v5. Created and maintained date/time pickers. 80% react websites used by date picker at somet point.

React · TypeScript · CSS

github.com/mui/material-ui

CypressCore Contributor★ 47k+

Author and lead architect of Cypress Component Testing. Core contributor to Cypress and a former employee of the company.

TypeScript · C++

github.com/cypress-io/cypress

React NativeMaintainer★ 120k

Maintained the status bar module for Android & iOS.

JavaScript · Java · Objective-C

github.com/facebook/react-native

FFmpegMaintainer★ 50k

Maintained the UDP streaming protocol: audio, video, and subtitles.

C · Video

code.ffmpeg.org/