Олександр

Oleksandr Lohinov
Senior Frontend Engineer · React / TypeScript
Dnipro, Ukraine · open to remote | [відкрити контакти](див. вище в блоці «контактна інформація») | [відкрити контакти](див. вище в блоці «контактна інформація») | github.com/AlexCW-hub | [відкрити контакти](див. вище в блоці «контактна інформація») |
Telegram: @AlexDevCW

PROFESSIONAL SUMMARY
Frontend developer with 16 years of experience, over 8 of them focused on React. Spent the last 10 years at
Clockwise Software, owning the frontend of a US-market SaaS platform for AI-driven hiring decisions: architecture,
code review, and the technical side of a business-model pivot. Specialise in large-scale SPA architecture,
performance and Core Web Vitals, and integrating AI-powered functionality into product interfaces. Track record of
large migrations and experience beyond the core stack: cross-platform and desktop apps, backend.
KEY SKILLS

Languages & Core TypeScript, JavaScript, HTML5, CSS3
Framework React
AI in the product LLM backend integration, SSE streaming of model responses, AI chat interfaces, UI for
explainable AI scoring and ranking
AI in the workflow Claude Code and other LLM assistants in daily work: code generation and refactoring,
review, exploring unfamiliar codebases, writing tests
State & data Redux Toolkit, Redux-Saga, axios, SSE, WebSocket (Socket.io)
UI & styling MUI, Emotion, Tailwind CSS, Storybook, react-hook-form, @dnd-kit
Build tooling Vite / rolldown-vite, Webpack, yarn workspaces (monorepo), code-splitting
Testing Vitest, Playwright (e2e), Storybook interaction tests, jsx-a11y
Performance Core Web Vitals, critical CSS, SSR, list virtualisation, technical SEO
Additional stack Nuxt, Vue, Angular 1/2, Ember, Laravel / PHP, C#, MySQL, React Native, Expo,
Capacitor / Cordova, Electron
Infrastructure Bitbucket Pipelines, Docker, Google Cloud Storage + CDN, PWA / Workbox, Stripe ·
code review, mentoring
Languages English — working proficiency; Russian, Ukrainian — native
PROFESSIONAL EXPERIENCE
Clockwise Software Jan 2016 — Present
Senior Frontend Engineer · clockwise.software
Company website (Nuxt) clockwise.software
Jan 2026 — Present · performance & SEO
Migrated the site from Nuxt 2 to Nuxt 4 along with its package ecosystem; currently moving the project to workspaces.
Developed a Nitro plugin to inline critical CSS into HTML, removing render-blocking style requests.
Raised Lighthouse Performance from 50 to 90+, cut LCP from 16.7s to 2.3s, Total Blocking Time from 460ms to 30ms, and Speed Index from 3.7s
to 1.5s.
Ran a technical SEO audit (Lighthouse, PageSpeed Insights) and fixed the issues found.
Made heavy use of Claude Code during the Nuxt 4 migration and performance work — refactoring, debugging build errors, speeding up routine tasks.
SaaS platform for hiring decisions, US market
Jan 2022 — Jan 2026 · web application · frontend team of 3, project team of 8
A layer on top of the client's ATS/HCM that builds a profile of a successful role from company data and ranks
candidates and employees against a single standard, explaining every score.
Owned frontend architecture and led code review for a 3-person frontend team inside an 8-person product team, from technical decisions through to
release.
Designed interfaces around the product's AI core: SSE streaming of model responses in an AI chat, ranked lists with per-item score explanations, and
integration with two backends (core and AI service) via separate axios instances.
Proposed and led the move to a yarn workspaces monorepo during a business-model pivot: 3 apps sharing auth and UI packages with isolated
dependencies. Cut per-app build time from 40–50 to ~5 minutes.
Led a phased migration of the app from React 16 to 19 and from MUI 0.20 to 7 without pausing feature delivery, on a core stack of React 19,
TypeScript 5.9 and Vite 7 (rolldown-vite).
Implemented routing on react-router-dom 7 data router with a loader-based auth guard — access/refresh token checks at the route loader level,
before the component renders.
Assembled the UI on MUI 7 + Emotion with a custom theme and Storybook 9, and wired up Twilio Conversations SDK and Socket.io for chat.
Integrated Stripe (subscriptions, billing dashboard) and a Workbox-based PWA with offline support; added candidate profile export to PDF.
Cut bundle size through manual vendor-based code-splitting, route-level lazy loading and regular bundle analysis.
Set up testing and delivery: Vitest, Storybook interaction tests, Playwright e2e; a Bitbucket Pipelines flow deploying to Google Cloud Storage with CDN
invalidation, four environments via a dedicated config-storage service.
High-traffic content platform (NDA)
Aug 2018 — Jan 2022 · web application
Engineered infinite-scroll feeds with list virtualisation on React 16 / Redux-Saga, keeping a high-traffic content platform smooth under heavy scroll
volume.
Shipped tag-based filtering across the content catalogue and a dedicated feature set for content partners, extending the platform beyond end-user
reading.
Small and mid-size client projects
Jan 2016 — Aug 2018 · outsourced development
Delivered a series of client projects across varied stacks — Angular 1/2, Ember, Laravel (PHP), C# — ramping up quickly on unfamiliar codebases to
meet each client's deadlines.
Created mobile and desktop applications with React Native, Expo, Capacitor / Cordova and Electron, extending delivery beyond the web.

Fenix Industry Oct 2010 — Dec 2015
Web Developer · web studio, Dnipro
Crafted landing pages, corporate websites and online stores for the Ukrainian market on PHP, MySQL, HTML, CSS, JavaScript and jQuery — full
development cycle from markup to backend.
Contributed to a custom modular admin panel that became the studio's standard backend, reused across client projects; ran several projects in
parallel.
EDUCATION

2007 — 2012 National Mining University (now Dnipro University of Technology), Dnipro — degree in
Information Security in Computer Systems and Networks