Oleksandr

Oleksandr Lohinov
Senior Frontend Developer | React, TypeScript
Phone: [open contact info](look above in the "contact info" section) Email: [open contact info](look above in the "contact info" section) Location: Dnipro, Ukraine (remote)
LinkedIn: [open contact info](look above in the "contact info" section) GitHub: github.com/AlexCW-hub Telegram: @AlexDevCW

SUMMARY

Frontend developer with 16 years of experience, 8+ of them in React. Currently improving performance and SEO of the Clockwise Software website;
previously owned the frontend of a US-market SaaS platform for AI-driven hiring decisions. Specialise in large-scale SPA architecture, Core Web Vitals and
AI features in product interfaces. Have led major migrations and delivered cross-platform and desktop apps.

SKILLS

Core TypeScript, JavaScript, React, HTML5, CSS3
State & data Redux Toolkit, Redux-Saga, axios, SSE, WebSocket
UI & styling MUI, Emotion, Tailwind CSS, Storybook, react-hook-form
Testing & build Vitest, Playwright, Vite, Webpack, yarn workspaces
AI LLM integration, SSE streaming, Claude Code
Other Nuxt, Vue, Angular, Laravel / PHP, C#, React Native, Docker, Bitbucket Pipelines, Stripe

EXPERIENCE

Senior Frontend Developer
Clockwise Software Jan 2016 – Present

Company website (Nuxt), performance & SEO Jan 2026 – Present
Migrate the site from Nuxt 2 to Nuxt 4 with its package ecosystem and move it to workspaces.
Develop a Nitro plugin that inlines critical CSS and removes render-blocking requests.
Raise 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.
Run SEO audits (Lighthouse, PageSpeed Insights) and fix the issues found.
Use Claude Code for refactoring, build debugging and routine tasks during the migration.
SaaS platform for hiring decisions, US market Jan 2022 – Jan 2026
Layer over the client's ATS/HCM that ranks candidates and employees against a role profile and explains every score.
Owned frontend architecture and code review for a 3-person team within an 8-person product team, from technical decisions to release.
Designed AI-facing UI: SSE-streamed chat responses and ranked lists with per-item score explanations.
Integrated two backends (core and AI service) through separate axios instances.
Led the move to a yarn workspaces monorepo during a business-model pivot: 3 apps sharing auth and UI packages, per-app build time cut from 40–50
to ~5 minutes.
Led a phased migration from React 16 to 19 and from MUI 0.20 to 7 without pausing feature delivery.
Implemented react-router-dom 7 routing with a loader-based auth guard that checks tokens before components render.
Assembled a themed MUI 7 + Storybook 9 UI with real-time chat (Twilio Conversations, Socket.io).
Integrated Stripe subscriptions, a billing dashboard and a Workbox PWA with offline support.
Built client-side PDF generation with pdfmake for candidate profile export.
Reduced bundle size with vendor-based code-splitting and route-level lazy loading.
Set up Vitest, Storybook interaction and Playwright e2e tests, plus Bitbucket Pipelines deploying to Google Cloud Storage and CDN across four
environments.
High-traffic content platform (NDA) Aug 2018 – Jan 2022
Engineered infinite-scroll feeds with list virtualisation on React 16 and Redux-Saga for a high-traffic platform.
Shipped tag-based catalogue filtering and a dedicated feature set for content partners.
Small and mid-size client projects Jan 2016 – Aug 2018
Delivered client projects on Angular 1/2, Ember, Laravel (PHP) and C#, ramping up fast on unfamiliar codebases.
Created mobile and desktop apps with React Native, Expo, Capacitor / Cordova and Electron.

Web Developer
Fenix Industry Oct 2010 – Dec 2015
Crafted landing pages, corporate sites and online stores on PHP, MySQL, HTML, CSS, JavaScript and jQuery, from markup to backend.
Contributed to a custom modular admin panel reused across client projects; ran several projects in parallel.

EDUCATION

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

LANGUAGES

Ukrainian Native Russian Native English Intermediate (B1)