Oleksandr

Oleksandr Makarov
Senior Front-End Engineer & Performance Specialist
Lviv, Ukraine | [відкрити контакти](див. вище в блоці «контактна інформація») | B2B Independent Contractor
LinkedIn | GitHub | Native Ukrainian | English: Upper-Intermediate (B2)

PROFESSIONAL SUMMARY

Front-End Engineer with ~5 years of product development experience building high-performance web
applications, specializing in deep browser mechanics, Core Web Vitals, and modular architectures like
Feature-Sliced Design (FSD). Proven track record of optimizing modern build systems (Webpack, Vite,
Turbopack) and delivering seamless cross-platform experiences using Next.js, Ionic, and Capacitor. Forward-
thinking engineer integrating local AI tools into daily workflows, driven by the perspective that AI will ultimately
reshape modern web architecture and replace traditional web browsers.

CORE COMPETENCIES & STACK

Performance: Web Vitals (LCP, CLS, FID), Lighthouse, Cloudflare routing/caching, GTM deferring, Next.js
image breakpoints, Memory Optimization
Frontend & Mobile: React, Next.js (App Router), TypeScript, Ionic, Capacitor, WebAssembly (Wasm)
State & Data: React Query, Redux Toolkit, Zustand, RTK Query OpenAPI codegen, SQLite, SQLCipher

Architecture & Feature-Sliced Design (FSD), Webpack, Vite, Turbopack, pnpm, Docker, GitHub Actions, CI/
Ops: CD

EXPERIENCE

Front-End Engineer | PlayQ Jun 2023 – Present

• Led major performance optimization initiatives on a Next.js/Webpack stack, successfully raising the mobile
Core Web Vitals score from 66 to 92.
• Deferred Google Tag Manager loading, configured Next.js image breakpoints, and optimized Cloudflare
integration to drastically improve Lighthouse performance metrics.
• Reduced initial bundle sizes by 36% through extensive Code-Splitting, migrating package management to
pnpm, and extracting heavy modules (e.g., Monaco Editor).
• Architected a VFS-based memory solution with session caching to bypass WebAssembly heap limits,
enabling efficient in-browser encrypted SQLite processing.
• Engineered algorithmic clusterization features for analytics and built real-time device testing interfaces
utilizing WebSockets.

Front-End Developer | Sure Lock & Key Nov 2021 – Jun 2023

• Developed complex web applications and dispatcher control systems utilizing Next.js, React, GraphQL, and
TypeScript.
• Established a shared modular component library that reduced feature development latency by 60%.
• Advocated for clean architecture and implemented scalable state management patterns.
• Collaborated closely with design teams via Figma to ensure pixel-perfect UX and high accessibility
standards.

KEY PROJECTS & OPEN SOURCE

my-jarvis (Local AI Automation CLI)
Developed an automated AI executor and reviewer system utilizing Claude and Gemini APIs alongside Model
Context Protocol (MCP) integrations to automate code tasks, PR reviews, and defect fixes in daily workflows.

Cross-Platform Mobile Architecture (Ionic + Capacitor)
Actively designing and building cross-platform applications bridging React web ecosystems with native mobile
capabilities, resolving SSR hydration bottlenecks and configuring native UX layouts.

@alex-dev-makarov/finance-math
Published a TypeScript utility package to GitHub Packages via automated CI/CD workflows, utilized in
personal finance applications structured around strategic capital allocation models.