# Denys Mikhalenko 🇺🇦

> Staff Software Engineer | Frontend Performance, Design Systems, and High-Scale Web Applications

Location: Sunnyvale, California, United States
Profile: https://flows.cv/denysmikhalenko

I’m a software engineer with 25+ years of experience building high-scale web applications and frontend infrastructure.
 
My work has focused on frontend performance, reusable UI systems, developer tooling, and complex user-facing products. I’ve worked on large-scale platforms at Figma, Meta, Walmart Labs, and other companies, where I helped improve critical user experiences, built internal tools, and contributed to infrastructure used across teams.
 
My experience includes leading File Browser performance improvements at Figma, contributing to Meta’s design system and Lexical editor, and driving major Cart & Checkout performance initiatives at Walmart Labs. My work there improved page load time by 60%, reduced JavaScript bundle size by 45%, and led to a shared bundle strategy adopted by multiple teams across the company.

I’m especially interested in fast, scalable interfaces, frontend architecture, design systems, and the engineering systems that help teams build reliable products more effectively.

## Work Experience
### Staff Software Engineer @ Figma
Jan 2022 – Present | San Francisco Bay Area
• Led major File Browser performance improvements for large organizations, focusing on data fetching, scalability, and frontend architecture
• Redesigned key parts of the File Browser, coordinating work across frontend, backend, and database layers
• Improved performance, reliability, and speed for a critical product surface used across the platform
• Mentored engineers and contributed to scalable frontend engineering practices

### Software Engineer @ Facebook
Jan 2020 – Jan 2022 | Menlo Park, CA
• Worked on frontend infrastructure and reusable UI systems for large-scale products at Meta
• Contributed to Meta’s design system by building reusable components and improving UI consistency across products
• Worked on Lexical, Meta’s next-generation web text editor, contributing to tooling, testing, and reliability
• Built solutions that improved testing workflows and helped the team scale development while maintaining product quality

### Staff Software Engineer @ Walmart Labs
Jan 2018 – Jan 2020 | Sunnyvale, CA
• Led major frontend performance initiatives for Cart & Checkout, improving page load time by 60% and reducing JavaScript bundle size by 45%
• Designed and implemented a DLL-based shared JavaScript bundle strategy later adopted by multiple teams across Walmart
• Built internal tools for engineers to improve development workflow, debugging, and performance visibility
• Received the Walmart Bolt Award in recognition of technical impact and innovation

### Lead Software Engineer @ EPAM Systems
Jan 2018 – Jan 2018 | San Francisco Bay Area
• Built scalable frontend solutions for EPAM clients including Apple and MachineZone
• Contributed to a marketing management platform for MachineZone using React and Redux
• Helped refactor Apple’s internal task tracking system
• Built a custom IntelliJ IDEA plugin to improve Ractive.js support and developer productivity for Apple engineers

### Senior Frontend Developer @ Kindbeetle
Jan 2015 – Jan 2017 | Bali, Indonesia
Full cycle development (from scratch to release):
• Betting platform for BetMaster betmaster.com (TypeScript, React + Redux, ImmutableJs)
• Mobile application for BetMaster (TypeScript, React Native, ImmutableJs)
• Mobile application for HelloHippo (TypeScript, React Native, MobX)
• Education portal for VTB Bank (TypeScript, MobX)
• New Year 2017 Mini Game for Yandex homepage (Phaser)
• Internal intents validation tool for Yandex (Vue)

### Senior Frontend Developer @ Mail.Ru Group
Jan 2014 – Jan 2015 | Moscow
• Built several high-traffic Mail.Ru content websites, including lady.mail.ru, horo.mail.ru, and news.mail.ru
• Created an internal company dashboard
• Contributed to Mail.Ru’s frontend framework “CPF”

### Full Stack Developer @ Art. Lebedev Studio
Jan 2012 – Jan 2014 | Moscow
• Built and delivered web projects from the ground up
• Worked across frontend and backend to implement product features and user interfaces
• Gained early experience shipping production systems end-to-end

### C++ Developer @ Orion Project
Jan 2010 – Jan 2012 | Moscow, Russian Federation
• Built backend and systems-level software in C++
• Worked on CAD automation tools and server-side services
• Contributed to performance-sensitive production systems

### Software Developer @ MTA
Jan 2004 – Jan 2010 | Moscow
• Accounting system for remote offices based on IBM Lotus Notes and IBM WebSphere, integrated with Microsoft Navision (IBM AS/400 with Java/DB2/Lotus Domino)
• Developed custom web services for integrating third-party services into existing infrastructure, such as railway and airline ticket booking systems and payment aggregation systems
• Horse21 hotel booking system integration
• Deployment and support of Microsoft Navision (3.01, 3.7, 4.0)
• Custom Navision business modules (C/SIDE)
• User support and technical documentation in Russian

### Java Developer @ Computer & Multimedia Systems
Jan 2000 – Jan 2003 | Vinnytsya, Ukraine
• Developed an instant messaging platform for PeopleLink.com, including backend (Java/MSSQL) and frontend (PHP, HTML/CSS/JS)
• Developed a mobile IM application for NTT DoCoMo (J2ME, DoJa i-appli)

### System Administrator & Software Developer @ Computer club "InterPlayer"
Jan 1998 – Jan 1999 | Vinnytsya, Ukraine
• Developed an internal billing and accounting system in Borland Delphi
• Administered a Linux server and more than 20 Windows workstations


## Education
### Engineer’s Degree in Computer Software Engineering
Vinnytsia State Technical University

### High School
Vinnitsa Technical Liceum


## Contact & Social
- LinkedIn: https://linkedin.com/in/prontiol

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Source: https://flows.cv/denysmikhalenko
JSON Resume: https://flows.cv/denysmikhalenko/resume.json
Last updated: 2026-04-12