# Samcheek - Frontend Architecture & eCommerce

> Canonical public content map for LLM crawlers and AI search systems.
> For full descriptions and excerpts, see /llms-full.txt.

## About

Yevhen Samkov is a Senior Frontend Architect and eCommerce specialist with 10+ years of
production experience building Next.js applications, headless Shopify and Adobe Commerce
(Magento) integrations, and Core Web Vitals optimization systems. Contentful Certified
Professional (2026). Based in Cherkasy, Ukraine; works globally with eCommerce, SaaS, and
publisher teams across UA, US, GB, and CA. This site (Samcheek) documents his technical
methodology across frontend architecture, performance engineering, structured data,
React Server Components, and headless commerce.

## Key Entities

- **Yevhen Samkov** - Person, Senior Frontend Architect, Contentful Certified (2026), Sanity Certified Content Operator (2026), 10+ years experience.
- **Samcheek** - Personal professional brand and portfolio site (samcheek.com).
- **Next.js** - React framework; expertise covers App Router, Server Components, ISR, PPR, middleware.
- **Core Web Vitals** - LCP (Largest Contentful Paint), INP (Interaction to Next Paint, replaced FID in 2024), CLS (Cumulative Layout Shift).
- **Headless eCommerce** - Shopify Hydrogen, Adobe Commerce (Magento), composable architecture, Storefront API.
- **Schema.org / JSON-LD** - Structured data for AI search and rich results: Organization, Person, Article, BreadcrumbList, FAQPage, Service, Offer.
- **React Server Components** - Zero-bundle server-rendered components; Next.js App Router primitive since v13.
- **Technical SEO** - Crawlability, indexation, hreflang, sitemap engineering, canonicalization.
- **GEO / AI Search** - Generative Engine Optimization for ChatGPT, Perplexity, Google AI Overviews, Bing Copilot.

## Primary Topics

- Next.js architecture and performance (App Router, RSC, PPR, ISR, middleware)
- Headless eCommerce architecture and migration (Shopify, Adobe Commerce)
- Frontend performance engineering and Core Web Vitals (LCP, INP, CLS)
- Technical SEO, Schema.org structured data, and AI discoverability
- React 19 features: useOptimistic, use(), Server Actions
- Web accessibility (WCAG 2.2) and inclusive React patterns

## Core Pages
- https://samcheek.com/
- https://samcheek.com/about
- https://samcheek.com/services
- https://samcheek.com/projects
- https://samcheek.com/blog
- https://samcheek.com/pricing
- https://samcheek.com/faq
- https://samcheek.com/resume-builder
- https://samcheek.com/ru
- https://samcheek.com/ru/about
- https://samcheek.com/ru/services
- https://samcheek.com/ru/projects
- https://samcheek.com/ru/blog
- https://samcheek.com/ru/pricing
- https://samcheek.com/ru/faq
- https://samcheek.com/ru/resume-builder
- https://samcheek.com/uk
- https://samcheek.com/uk/about
- https://samcheek.com/uk/services
- https://samcheek.com/uk/projects
- https://samcheek.com/uk/blog
- https://samcheek.com/uk/pricing
- https://samcheek.com/uk/faq
- https://samcheek.com/uk/resume-builder

## Tools and Research

- https://samcheek.com/audit: Free SEO and Core Web Vitals audit for any URL. Lab and field data, technical SEO, crawlability, AI-crawler access, structured data, security.
- https://samcheek.com/tools/page-speed-roi-calculator: Prices a page-speed improvement at your own traffic, conversion rate and order value. Reports a band across three randomised experiments and refuses to price any gap beyond the 500ms a linear approximation is validated over.
- https://samcheek.com/tools/page-speed-roi-calculator/method: What page speed is worth, from the primary literature. 15 sources with designs, DOIs and verbatim quotes; randomised experiments measure 0.60% of revenue per 100ms against 18.37% from the observational study most calculators use.
- https://samcheek.com/ru/audit: Free SEO and Core Web Vitals audit for any URL. Lab and field data, technical SEO, crawlability, AI-crawler access, structured data, security.
- https://samcheek.com/ru/tools/page-speed-roi-calculator: Prices a page-speed improvement at your own traffic, conversion rate and order value. Reports a band across three randomised experiments and refuses to price any gap beyond the 500ms a linear approximation is validated over.
- https://samcheek.com/ru/tools/page-speed-roi-calculator/method: What page speed is worth, from the primary literature. 15 sources with designs, DOIs and verbatim quotes; randomised experiments measure 0.60% of revenue per 100ms against 18.37% from the observational study most calculators use.
- https://samcheek.com/uk/audit: Free SEO and Core Web Vitals audit for any URL. Lab and field data, technical SEO, crawlability, AI-crawler access, structured data, security.
- https://samcheek.com/uk/tools/page-speed-roi-calculator: Prices a page-speed improvement at your own traffic, conversion rate and order value. Reports a band across three randomised experiments and refuses to price any gap beyond the 500ms a linear approximation is validated over.
- https://samcheek.com/uk/tools/page-speed-roi-calculator/method: What page speed is worth, from the primary literature. 15 sources with designs, DOIs and verbatim quotes; randomised experiments measure 0.60% of revenue per 100ms against 18.37% from the observational study most calculators use.

## Agent API

- API catalog (RFC 9727): https://samcheek.com/.well-known/api-catalog
- OpenAPI 3.1 contract: https://samcheek.com/api/openapi.json
- Capabilities (Schema.org JSON-LD, public GET): https://samcheek.com/api/agent/capabilities
- Discovery guidance (POST, no auth): https://samcheek.com/api/agent/consult
- Consultation requests go to a queue that a human reviews; nothing is booked automatically.

## Service Detail Pages
- [Headless Architecture](https://samcheek.com/services/headless-architecture)
- [Enterprise Ecommerce](https://samcheek.com/services/enterprise-ecommerce)
- [Legacy Migration](https://samcheek.com/services/legacy-migration)
- [React Spa Development](https://samcheek.com/services/react-spa-development)
- [Pixel Perfect Ui](https://samcheek.com/services/pixel-perfect-ui)
- [Ui Kit Development](https://samcheek.com/services/ui-kit-development)
- [Performance Optimization](https://samcheek.com/services/performance-optimization)
- [Technical Seo](https://samcheek.com/services/technical-seo)
- [Accessibility Audit](https://samcheek.com/services/accessibility-audit)
- [Internationalization Rtl](https://samcheek.com/services/internationalization-rtl)
- [Api Orchestration](https://samcheek.com/services/api-orchestration)
- [Pwa Development](https://samcheek.com/services/pwa-development)
- [Ai Ui Integration](https://samcheek.com/services/ai-ui-integration)
- [Ai Agents Ecommerce](https://samcheek.com/services/ai-agents-ecommerce)
- [Motion Microinteractions](https://samcheek.com/services/motion-microinteractions)
- [Technical Audit](https://samcheek.com/services/technical-audit)
- [Headless Architecture](https://samcheek.com/ru/services/headless-architecture)
- [Enterprise Ecommerce](https://samcheek.com/ru/services/enterprise-ecommerce)
- [Legacy Migration](https://samcheek.com/ru/services/legacy-migration)
- [React Spa Development](https://samcheek.com/ru/services/react-spa-development)
- [Pixel Perfect Ui](https://samcheek.com/ru/services/pixel-perfect-ui)
- [Ui Kit Development](https://samcheek.com/ru/services/ui-kit-development)
- [Performance Optimization](https://samcheek.com/ru/services/performance-optimization)
- [Technical Seo](https://samcheek.com/ru/services/technical-seo)
- [Accessibility Audit](https://samcheek.com/ru/services/accessibility-audit)
- [Internationalization Rtl](https://samcheek.com/ru/services/internationalization-rtl)
- [Api Orchestration](https://samcheek.com/ru/services/api-orchestration)
- [Pwa Development](https://samcheek.com/ru/services/pwa-development)
- [Ai Ui Integration](https://samcheek.com/ru/services/ai-ui-integration)
- [Ai Agents Ecommerce](https://samcheek.com/ru/services/ai-agents-ecommerce)
- [Motion Microinteractions](https://samcheek.com/ru/services/motion-microinteractions)
- [Technical Audit](https://samcheek.com/ru/services/technical-audit)
- [Headless Architecture](https://samcheek.com/uk/services/headless-architecture)
- [Enterprise Ecommerce](https://samcheek.com/uk/services/enterprise-ecommerce)
- [Legacy Migration](https://samcheek.com/uk/services/legacy-migration)
- [React Spa Development](https://samcheek.com/uk/services/react-spa-development)
- [Pixel Perfect Ui](https://samcheek.com/uk/services/pixel-perfect-ui)
- [Ui Kit Development](https://samcheek.com/uk/services/ui-kit-development)
- [Performance Optimization](https://samcheek.com/uk/services/performance-optimization)
- [Technical Seo](https://samcheek.com/uk/services/technical-seo)
- [Accessibility Audit](https://samcheek.com/uk/services/accessibility-audit)
- [Internationalization Rtl](https://samcheek.com/uk/services/internationalization-rtl)
- [Api Orchestration](https://samcheek.com/uk/services/api-orchestration)
- [Pwa Development](https://samcheek.com/uk/services/pwa-development)
- [Ai Ui Integration](https://samcheek.com/uk/services/ai-ui-integration)
- [Ai Agents Ecommerce](https://samcheek.com/uk/services/ai-agents-ecommerce)
- [Motion Microinteractions](https://samcheek.com/uk/services/motion-microinteractions)
- [Technical Audit](https://samcheek.com/uk/services/technical-audit)

## Commercial Offers
- [Stabilize: Stop Revenue Leaks](https://samcheek.com/offers/frontend-stability-pack)
- [Grow: Conversion & CRO](https://samcheek.com/offers/conversion-growth-pack)
- [Scale: Architecture & Real-Time Systems](https://samcheek.com/offers/architecture-lead-pack)
- [Стабилизация: остановить потери выручки](https://samcheek.com/ru/offers/frontend-stability-pack)
- [Рост: конверсия и CRO](https://samcheek.com/ru/offers/conversion-growth-pack)
- [Масштаб: архитектура и real-time системы](https://samcheek.com/ru/offers/architecture-lead-pack)
- [Стабілізація: зупинити втрати доходу](https://samcheek.com/uk/offers/frontend-stability-pack)
- [Зростання: конверсія та CRO](https://samcheek.com/uk/offers/conversion-growth-pack)
- [Масштаб: архітектура та real-time системи](https://samcheek.com/uk/offers/architecture-lead-pack)

## Blog Articles
- [Is Headless Commerce Worth It? A Store Owner's Guide (2026)](https://samcheek.com/blog/is-headless-commerce-worth-it-store-owner-guide-2026): You keep being told to go headless, but almost nobody explains what it means for the person who pays for it. This is a plain guide for store owners, written...
- [Стоит ли переходить на headless-коммерцию? Гид для владельца магазина (2026)](https://samcheek.com/ru/blog/is-headless-commerce-worth-it-store-owner-guide-2026): Вам постоянно советуют «уйти в headless», но почти никто не объясняет, что это значит для того, кто за это платит. Это простой гид для владельца магазина, бе...
- [Чи варто переходити на headless-комерцію? Гід для власника магазину (2026)](https://samcheek.com/uk/blog/is-headless-commerce-worth-it-store-owner-guide-2026): Вам постійно радять «піти в headless», але майже ніхто не пояснює, що це означає для того, хто за це платить. Це простий гід для власника магазину, без жарго...
- [Core Web Vitals Assessment: Failed - How to Read the Report and Fix the Right Thing (2026)](https://samcheek.com/blog/core-web-vitals-assessment-failed-2026): Search Console reports a failed Core Web Vitals assessment and PageSpeed Insights shows a green 95 on the same page. Both are accurate, and the gap between t...
- [Core Web Vitals assessment: Failed - как читать отчёт Search Console и что чинить первым (2026)](https://samcheek.com/ru/blog/core-web-vitals-assessment-failed-2026): Search Console показывает проваленную оценку Core Web Vitals, а PageSpeed Insights на той же странице выдаёт зелёные 95. Оба числа верны, и разрыв между ними...
- [Core Web Vitals assessment: Failed - як читати звіт Search Console і що лагодити першим (2026)](https://samcheek.com/uk/blog/core-web-vitals-assessment-failed-2026): Search Console показує провалену оцінку Core Web Vitals, а PageSpeed Insights на тій самій сторінці видає зелені 95. Обидва числа правильні, і розрив між ним...
- [Migrating WordPress to Payload CMS: A Production Migration Playbook (2026)](https://samcheek.com/blog/wordpress-to-payload-cms-migration-2026): A practical, engineering-level account of moving a multi-locale site off WordPress and onto Payload CMS 3.77, backed by PostgreSQL on Neon and deployed on Ve...
- [Миграция с WordPress на Payload CMS: практический гайд по продакшн-миграции (2026)](https://samcheek.com/ru/blog/wordpress-to-payload-cms-migration-2026): Инженерный разбор переезда мультиязычного сайта с WordPress на Payload CMS 3.77 с PostgreSQL на Neon и деплоем на Vercel. Стек и его обоснование, конвертация...
- [Міграція з WordPress на Payload CMS: практичний гайд із продакшн-міграції (2026)](https://samcheek.com/uk/blog/wordpress-to-payload-cms-migration-2026): Інженерний розбір переїзду мультимовного сайту з WordPress на Payload CMS 3.77 із PostgreSQL на Neon і деплоєм на Vercel. Стек та його обґрунтування, конверт...
- [The Universal Web Performance Architecture: A Systems-Level Analysis of 12 Engineering Pillars (2026 Edition)](https://samcheek.com/blog/universal-web-performance-bible-2026): A 25-point Lighthouse jump - desktop 72 to 99 - rarely comes from a hundred micro-tweaks; it comes from moving two or three assets off the main thread. A dee...
- [Архитектура веб-производительности: системный анализ 12 инженерных принципов (издание 2026)](https://samcheek.com/ru/blog/universal-web-performance-bible-2026): Скачок Lighthouse на 25 пунктов - с 72 до 99 на десктопе - редко складывается из сотни микроправок; он берётся из переноса двух-трёх ассетов с основного пото...
- [Архітектура веб-продуктивності: системний аналіз 12 інженерних принципів (видання 2026)](https://samcheek.com/uk/blog/universal-web-performance-bible-2026): Стрибок Lighthouse на 25 пунктів - з 72 до 99 на десктопі - рідко складається зі сотні мікроправок; він береться з перенесення двох-трьох ассетів з основного...
- [INP Optimization in Next.js 16: Why 43% of Sites Fail and the Engineering Playbook to Fix It](https://samcheek.com/blog/inp-optimization-nextjs-2026): Why 43% of mobile sites still fail INP two years after it became a Core Web Vital - and how to fix it. Covers root cause breakdown, scheduler.yield(), React...
- [INP-оптимизация в Next.js 16: почему 43% сайтов проваливают метрику и как это исправить](https://samcheek.com/ru/blog/inp-optimization-nextjs-2026): Почему 43% мобильных сайтов по-прежнему проваливают INP и как это исправить. Разбираю причины отказов, scheduler.yield(), React Server Components, компилятор...
- [INP-оптимізація в Next.js 16: чому 43% сайтів провалюють метрику і як це виправити](https://samcheek.com/uk/blog/inp-optimization-nextjs-2026): Чому 43% мобільних сайтів досі провалюють INP і як це виправити. Розбираю причини відмов, scheduler.yield(), React Server Components, компілятор React 19 та...
- [React Server Components: How the Zero-Bundle Architecture Actually Works (2026)](https://samcheek.com/blog/react-server-components-architecture-2026): A deep dive into React Server Components - the rendering model that eliminates client JavaScript for server-only trees. Covers the RSC wire format, component...
- [React Server Components: как на самом деле работает архитектура с нулевым бандлом (2026)](https://samcheek.com/ru/blog/react-server-components-architecture-2026): Глубокое погружение в React Server Components - модель рендеринга, которая убирает клиентский JavaScript для серверных поддеревьев. Wire-формат RSC, семантик...
- [React Server Components: як насправді працює архітектура з нульовим бандлом (2026)](https://samcheek.com/uk/blog/react-server-components-architecture-2026): Глибоке занурення в React Server Components - модель рендерингу, що прибирає клієнтський JavaScript для серверних піддерев. Wire-формат RSC, семантика меж, a...
- [Shopify Hydrogen vs Next.js Commerce: Which Architecture is Right for Your Storefront in 2026](https://samcheek.com/blog/shopify-hydrogen-vs-nextjs-commerce-2026): An in-depth comparison of the two main headless Shopify storefront architectures. Covers runtime model, data layer, caching strategy, bundle size, performanc...
- [Shopify Hydrogen vs Next.js Commerce: какую архитектуру выбрать для магазина в 2026](https://samcheek.com/ru/blog/shopify-hydrogen-vs-nextjs-commerce-2026): Детальное сравнение двух основных headless-архитектур для Shopify. Модель исполнения, слой данных, стратегия кэширования, размер бандла, бенчмарки производит...
- [Shopify Hydrogen vs Next.js Commerce: яку архітектуру обрати для магазину у 2026](https://samcheek.com/uk/blog/shopify-hydrogen-vs-nextjs-commerce-2026): Детальне порівняння двох основних headless-архітектур для Shopify. Модель виконання, шар даних, стратегія кешування, розмір бандлу, бенчмарки продуктивності...
- [Next.js App Router Migration from Pages Router: The Complete Practical Guide (2026)](https://samcheek.com/blog/nextjs-app-router-migration-from-pages-router-2026): A practical migration guide for teams moving production Next.js apps from Pages Router to App Router. Covers the architectural differences, incremental migra...
- [Миграция на Next.js App Router с Pages Router: полный практический гайд (2026)](https://samcheek.com/ru/blog/nextjs-app-router-migration-from-pages-router-2026): Практический гайд по миграции продакшн-приложений Next.js с Pages Router на App Router. Стоимостная модель гидратации RSC, механика модульного графа webpack...
- [Міграція на Next.js App Router з Pages Router: повний практичний гайд (2026)](https://samcheek.com/uk/blog/nextjs-app-router-migration-from-pages-router-2026): Практичний гайд з міграції продакшн-застосунків Next.js з Pages Router на App Router. Вартісна модель гідратації RSC, механіка модульного графа webpack і дир...
- [Headless Shopify with Next.js: Complete Build Guide (Step-by-Step 2026)](https://samcheek.com/blog/headless-shopify-nextjs-complete-build-guide-2026): A practical guide to building a production headless Shopify storefront on Next.js App Router. Covers Shopify's three API tiers, typed GraphQL codegen data la...
- [Headless Shopify на Next.js: полный гайд по архитектуре (2026)](https://samcheek.com/ru/blog/headless-shopify-nextjs-complete-build-guide-2026): Практический гайд по построению продакшн headless Shopify-стора на Next.js App Router. Три API-уровня Shopify, типизированный GraphQL data layer, генерация к...
- [Headless Shopify на Next.js: повний гайд з архітектури (2026)](https://samcheek.com/uk/blog/headless-shopify-nextjs-complete-build-guide-2026): Практичний гайд з побудови продакшн headless Shopify-стору на Next.js App Router. Три API-рівні Shopify, типізований GraphQL data layer, генерація каталогу ч...
- [JSON-LD Schema.org in Next.js App Router: Complete Reference (2026 Edition)](https://samcheek.com/blog/json-ld-schema-nextjs-app-router-2026): A complete technical reference for implementing JSON-LD Schema.org structured data in Next.js App Router. Covers the entity graph model, injection architectu...
- [JSON-LD Schema.org в Next.js App Router: полный справочник (2026)](https://samcheek.com/ru/blog/json-ld-schema-nextjs-app-router-2026): Полный технический справочник по реализации JSON-LD Schema.org в Next.js App Router. Модель entity graph, архитектура инъекции (Server Component vs generateM...
- [JSON-LD Schema.org у Next.js App Router: повний довідник (2026)](https://samcheek.com/uk/blog/json-ld-schema-nextjs-app-router-2026): Повний технічний довідник з реалізації JSON-LD Schema.org у Next.js App Router. Модель entity graph, архітектура інʼєкції (Server Component vs generateMetada...
- [Partial Prerendering (PPR) in Production: Architecture Patterns (2026 Edition)](https://samcheek.com/blog/nextjs-partial-prerendering-production-2026): A deep dive into Next.js Partial Prerendering in production. Covers the two-phase response mechanism (static shell from CDN + streaming dynamic holes), Suspe...
- [Partial Prerendering (PPR) в продакшне: архитектурные паттерны (2026)](https://samcheek.com/ru/blog/nextjs-partial-prerendering-production-2026): Детальный разбор Next.js Partial Prerendering в продакшне. Механизм двухфазного ответа (статический shell с CDN + стриминговые dynamic holes), правила размещ...
- [Partial Prerendering (PPR) у продакшні: архітектурні патерни (2026)](https://samcheek.com/uk/blog/nextjs-partial-prerendering-production-2026): Детальний розбір Next.js Partial Prerendering у продакшні. Механізм двофазної відповіді, правила розміщення Suspense-меж, взаємодія з Full Route Cache, дизай...
- [React 19 New Features: useOptimistic, use(), Server Actions Explained (2026 Edition)](https://samcheek.com/blog/react-19-features-useoptimistic-use-server-actions-2026): A deep dive into React 19's five new primitives: useOptimistic (concurrent optimistic state with automatic rollback), use() (conditional Promise and Context...
- [React 19: useOptimistic, use(), Server Actions - механизм и архитектура (2026)](https://samcheek.com/ru/blog/react-19-features-useoptimistic-use-server-actions-2026): Детальный разбор пяти новых примитивов React 19: useOptimistic (конкурентная composition оптимистичного состояния с автоматическим rollback), use() (условное...
- [React 19: useOptimistic, use(), Server Actions - механізм і архітектура (2026)](https://samcheek.com/uk/blog/react-19-features-useoptimistic-use-server-actions-2026): Детальний розбір п'яти нових примітивів React 19: useOptimistic, use(), Server Actions, useActionState, useFormStatus. Action-based mutation архітектура, що...
- [Web Accessibility in 2026: Screen Readers, WCAG 2.2, and What Actually Works in Production](https://samcheek.com/blog/web-accessibility-a11y-guide-2026): A practical guide to web accessibility from a production frontend perspective: how screen readers interpret the DOM, what WCAG 2.2 requires in concrete terms...
- [Веб-доступность в 2026: скринридеры, WCAG 2.2 и практики, которые реально работают](https://samcheek.com/ru/blog/web-accessibility-a11y-guide-2026): Практическое руководство по веб-доступности с точки зрения production frontend-разработки: как скринридеры интерпретируют DOM, что требует WCAG 2.2 в конкрет...
- [Веб-доступність у 2026: скринридери, WCAG 2.2 і практики, що реально працюють](https://samcheek.com/uk/blog/web-accessibility-a11y-guide-2026): Практичний посібник з веб-доступності з точки зору production frontend-розробки: як скринридери інтерпретують DOM, що вимагає WCAG 2.2 у конкретних термінах...
- [Headless Magento in 2026: A Complete, Honest Guide](https://samcheek.com/blog/headless-magento-commerce-guide-2026): Most headless Magento guides are written to sell you an agency's hours. This one is written by the person who builds the storefronts. What headless Magento a...
- [Headless Magento в 2026: полный и честный гид](https://samcheek.com/ru/blog/headless-magento-commerce-guide-2026): Почти все гиды по headless Magento написаны, чтобы продать вам часы агентства. Этот написан тем, кто собирает витрины. Что такое headless Magento на самом де...
- [Headless Magento у 2026: повний і чесний гайд](https://samcheek.com/uk/blog/headless-magento-commerce-guide-2026): Майже всі гайди з headless Magento написані, щоб продати вам години агенції. Цей написаний тим, хто збирає вітрини. Що таке headless Magento насправді, коли...
- [Shopify Headless Pricing in 2026: What It Really Costs](https://samcheek.com/blog/shopify-headless-pricing-guide-2026): Most headless Shopify pricing pages are quotes in disguise. This one breaks the cost down honestly: what the Shopify platform really charges, why the framewo...
- [Цена headless Shopify в 2026: сколько это реально стоит](https://samcheek.com/ru/blog/shopify-headless-pricing-guide-2026): Почти все страницы про цену headless Shopify — это замаскированные заявки на расчёт. Эта разбирает стоимость честно: сколько на самом деле берёт платформа Sh...
- [Ціна headless Shopify у 2026: скільки це реально коштує](https://samcheek.com/uk/blog/shopify-headless-pricing-guide-2026): Майже всі сторінки про ціну headless Shopify — це замасковані заявки на розрахунок. Ця розбирає вартість чесно: скільки насправді бере платформа Shopify, чом...

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