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Work & Cases

Production projects

2+ years at Musan Group — Kazakhstan's largest media holding. Real high-traffic products built and maintained with Next.js.

2023–2025

Anta.kz

Sports brand e-commerce

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Next.jsTypeScriptE-commercePerformanceREST API

What I did

  • 01Built the e-commerce platform from scratch — architecture, SSR product pages, search, cart, user account, reviews and full admin panel.
  • 02Designed modular component architecture: SSR for SEO-critical pages, CSR for interactive elements — optimal balance of performance and UX.
  • 03Implemented complete checkout flow with installment payment via REST API, including all payment status scenarios and UX for success/failure states.
  • 04Fixed Core Web Vitals across all three metrics (LCP, INP, CLS): refactored product listing, added memoization, code splitting, reduced initial JS bundle.
  • 05Consolidated 417 materials and 300 colors into a unified Material/Color Group structure — fixed broken filters across a 1,000+ product catalog and eliminated duplication.
  • 06Set up CI/CD pipeline and Sentry monitoring; resolved critical production bugs in checkout, localStorage and order-completed flows.

Key impact

  • Core Web Vitals: red → green
  • Full checkout with installments
  • Filters fixed for 1,000+ product catalog

anta.kz

Live production site

→

2024–2025

Kapital.kz

Business & finance news portal

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Next.jsTailwindSchema.orgBigQuerySEOAMP

What I did

  • 01Improved all three Core Web Vitals: reduced LCP on finance.kapital, brought INP to green zone, fixed CLS caused by Google Ads loading, infinite-scroll and heavy third-party libraries.
  • 02Used BigQuery to analyse real-user field data (CrUX) and pinpoint exact performance bottlenecks before making changes.
  • 03Updated Schema.org JSON-LD markup for news articles, fixed AMP page errors — improved SEO visibility and Google News ranking.
  • 04Improved UI/UX of news card components, fixed HTML validation issues and resolved production bugs in the editorial content interface.

Key impact

  • All 3 Core Web Vitals green
  • BigQuery-driven analysis
  • AMP + Schema.org fixed

kapital.kz

Live production site

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2024

Sdelka.kz

Business acquisition marketplace

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Next.jsExpress.jsPostgreSQLMarketplace

What I did

  • 01Built FAQ section with full-text search and categorisation — reduced support load and improved content discoverability.
  • 02Designed and implemented 'Person Dossier' (Qazmonitor) feature: page architecture, UI, navigation and data-fetching logic from external sources.
  • 03Optimised client-side rendering for large datasets: request caching, lazy loading and pagination — eliminated UI freezes on heavy data pages.
  • 04Maintained admin panel for marketplace content management — company listings, ad moderation workflows.

Key impact

  • Full-text search
  • Dossier feature shipped
  • Large dataset performance

sdelka.kz

Live production site

→

2023–2024

Mustafin Magazine

Lifestyle & culture media platform

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Next.jsReactStreamingAudio

What I did

  • 01Provided post-launch engineering support — bug fixes, performance improvements and iterative feature additions.
  • 02Built a full streaming radio player from scratch: audio streaming, playlist management, playback state across page navigations.

Key impact

  • Streaming radio player
  • Post-launch support

mustafinmag.kz

Live production site

→

Want to work together?

Available for new projects. Tell me what you're building — I'll respond within 24 hours.

beksultan.sagnaev@gmail.comTelegram →
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