Leonid Dzyhanskyi

Lead Frontend Engineer

Web Platform Expert (SFCC & Modern Stack) • Ukraine

Professional Summary

Engineering Lead with 12+ years of experience rooted in Fundamental Web Technologies. I define myself as Framework Agnostic: while I seamlessly work with React, Next.js, or Vue, I view them merely as tools. My true expertise lies in the underlying platform—Native JavaScript, Web Components, and CSS Architecture.

I specialize in High-Performance Architectures using a Tiered Optimization Strategy. I leverage standard browser capabilities first—utilizing Web Workers for off-main-thread processing—and only escalate to Rust/WASM when absolute performance is critical.

💡 Role Definition: Operating at "Staff" Level

While my title is Lead, I operate with a Staff Engineer mindset. Unlike a traditional Team Lead focused purely on management, I focus on Technical Leverage:

  • Force Multiplier: I build tools and workflows that make the entire team faster.
  • System Strategy: I solve cross-domain challenges (Legacy vs. Modern) rather than just individual tickets.
  • Hands-on: I spend 60%+ of my time coding critical paths to unblock the team.

Technical Expertise

Web FoundationsDeep Native JS (ES3-ESNext)Light DOM Web ComponentsBrowser Rendering MechanicsDOM Manipulation
Performance StrategyTiered OptimizationMain Thread (UI)Web Workers (Data Processing)Rust + WASM (Heavy Computation)
SFCC & LegacyLegacy JS (ES5) backend scriptingMonolithic pipeline optimizationLazy Loading strategies for 3rd-party
Modern R&DNext.js (App Router)Rust + WASM (High-perf logic)GCP (Cloud Run)Firebase
CSS ArchitectureModern CSS (Variables, Logical Properties)Modular SCSS (Automation Mixins)BEM MethodologyTailwind
Engineering OpsNative RTLWCAG AA (Architectural Level)Core Web Vitals AuditingCI/CD, Zero-Trust Security

Cognitive Profile (Gallup CliftonStrengths®)

My engineering approach is validated by my top Gallup themes. Download Full Report (PDF)

1Arranger
Orchestration

I naturally organize chaos. Whether configuring complex Webpack builds or managing distributed teams, I find the most efficient arrangement for resources.

2Achiever
Execution

I have high stamina for delivery. I don't just design; I code critical paths myself to ensure the product crosses the finish line.

3Restorative™
Stabilization

I excel at diagnosing "broken" systems. Transforming slow, legacy codebases into performant products is my core motivation.

Professional Experience

08.2023 – PresentRacccoon LLC

Full-Stack Developer

Remote

Built e-commerce interfaces on SFCC (SFRA), set up Business Manager, and integrated third-party services. Extended client-side JS for dynamic features and AJAX. Used Page Designer and Amplience for content. Improved accessibility (WCAG), optimized performance, and created technical docs. Participated in planning and client demos.

09.2021 – PresentAlpenite/Arsenalia (Dior)

Lead Frontend Engineer

Remote

Revamped Webpack/Rspack build with strict Tree-Shaking. Replaced jQuery with Native JS. Established TSD standards. Dynamic Image Composition and smart lazy-loading. Scalable SCSS system with Native RTL support.

2023 – 2026Scootify Ecosystem (R&D)

Principal Architect & Product Owner

Ukraine

Multi-Tenant Micro-Mobility Platform on GCP. Hub (scootify.eco), MaaS (scootify.com.ua), Retail (hiley.com.ua). Next.js + Rust/WASM. Light DOM Web Components. Web Workers for data sorting (UI unblocked). Telegram/Chat Bots for analytics.

04.2021 – 03.2022Bay Bridge Digital

SFCC Developer

France (Remote)

Legacy stabilization, checkout refactoring for improved conversion. Multi-currency logic and RTL layout adaptations for global markets.

05.2019 – 08.2021The Raven

Front-End Team Lead

Ukraine

Led a team developing complex, multilingual Angular applications. Focus on architectural consistency and strict type safety.

10.2015 – 02.2021Astound Commerce

Senior SFCC Developer

Ukraine

Core Contributor: 10+ major e-commerce rollouts for global brands. Mastered SFCC caching strategies and asset optimization.

02.2014 – 08.2019Stryzhavka Online

Co-Founder & Lead Engineer (Civic Tech)

Ukraine

Hyper-local Social & GovTech Platform for Stryzhavka community. Integrated municipal data with social networking features. Successfully transferred to local government as official digital infrastructure.

06.2012 – 10.2015Action Pay / Freelance

Web Developer

Ukraine

Early career focus on PHP, WordPress, and cross-browser compatibility.