# FXTech — full company profile > FXTech (Shenzhen Feixing Keyao Technology Co., Ltd.) is a Shenzhen-based e-commerce technology agency and Shopify Partner. We build Shopify / Shopify Plus stores, headless DTC storefronts, web performance optimization (Core Web Vitals) and cross-border VAT compliance systems for brands expanding overseas. Principle: simple, efficient, best practice. - Website: https://fxweb.dev/ - Contact page (Telegram, email and phone): https://fxweb.dev/contact/ - Based in Shenzhen, China; working languages English and Chinese; remote collaboration with overseas teams - Team: senior web engineers with 10+ years of experience and 5+ years building e-commerce storefronts; 100+ clients across fashion, beauty, electronics, home, energy and cross-border tax services - How to engage: describe your project via Telegram, email or phone; we discuss goals and current state first, then scope and quote the work. No fixed packages. ## When to contact us - You need a Shopify Partner in China for theme customization, app development or ERP / CRM integration - You want a headless DTC storefront on MedusaJS or a similar open-source stack that you own, with no platform commission - Your website or Shopify store is slow or fails Core Web Vitals and you want it fixed without a rebuild - You are a VAT service provider or tax agent and want registration, tax calculation, filing and EPR turned into a self-service online product - You need a custom B2B collaboration system, supply-chain tracking portal or an AI assistant for your domain knowledge ## Services ### Shopify and Shopify Plus Development Page: https://fxweb.dev/shopify/ Shopify Partner for Shopify / Shopify Plus theme development and Liquid customization, custom Shopify apps, and systems that integrate with your ERP, CRM and inventory. For: Cross-border sellers and global brands, from early-stage DTC stores to established brands that need internal system integrations. Capabilities: - Shopify theme development and Liquid customization: multi-language, multi-currency, multi-market (Shopify Markets) - Shopify App and custom app development: two-way sync of orders, inventory, products and customers with ERP / CRM - Systems around Shopify: product and order hubs, fulfillment, analytics and financial reports, staff performance, ad cost (ROAS) analysis, supply chain - Improvements to an existing theme: layout and responsive fixes, custom sections, analytics, load speed - Post-launch fixes, new features and performance work - Tech stack: Shopify Liquid, React, Tailwind CSS, Shopify Admin / Storefront API #### Shopify and Shopify Plus Development — FAQ ### What Shopify development services do you offer? Shopify theme development and Liquid customization (multi-language, multi-currency, multi-market), Shopify App and custom app development (ERP / CRM / inventory integrations), and systems around Shopify: product and order hubs, fulfillment, reporting, ad cost analysis and supply chain management. ### Can you modify our existing Shopify theme instead of rebuilding? Yes. We customize Liquid in your current theme: layout and responsive fixes, custom sections and navigation, analytics integration and faster load times. A full rebuild is not always needed. ### Can Shopify integrate with our ERP, CRM or inventory system? Yes. We build private apps on the Shopify API that sync orders, inventory, products and customers both ways with your internal systems, for example real-time stock updates to prevent overselling, or pushing customer data to your CRM. Traffic is encrypted and permissions are set by role. ### Do you support both Shopify and Shopify Plus? Yes. Shopify Plus adds stronger multi-store, checkout customization and automation features for larger brands. We help you decide whether upgrading makes sense for your scale. ### Do you provide support after the store goes live? Yes. We know Shopify's architecture and APIs well and continue to handle fixes, new features and performance work after launch to keep your store running reliably. ### DTC Storefront Development (Headless / Composable Commerce) Page: https://fxweb.dev/ecommerce/ Headless brand storefronts on open-source frameworks such as MedusaJS: payments, fulfillment, product hub, customer accounts, marketing automation and reporting, multi-language and multi-currency, self-hosted, with no platform fees and full data ownership. For: Brands that need more from the shopping experience, workflows, data ownership or platform fees, and want long-term control of their storefront. Capabilities: - MedusaJS or similar open-source core, decoupled front and back ends, deployed on your own cloud - Payments: Stripe, PayPal and local methods, with order validation and anomaly blocking - Logistics: carriers, warehouse systems and rate rules, with fulfillment sync and shipment tracking - Inventory and product hub, customer accounts, marketing automation, reporting - Multi-language, multi-currency, multi-market: localized content, tax rules, shipping, regional marketing - Access control, data backups, logging and monitoring, canary releases #### DTC Storefront Development (Headless / Composable Commerce) — FAQ ### What is a headless / composable commerce storefront? It separates the customer-facing storefront from core commerce services such as products, orders, payments and accounts. You design the front end freely and iterate fast, while back-end modules are combined and extended as you grow, instead of being limited by one platform's templates and plugins. ### How does an open-source storefront differ from Shopify? With open source you own the code, data and hosting, pay no platform fees and can customize workflows fully. The trade-off: you or your agency handle deployment and operations. Shopify launches faster and is easier to run, but customization and data control are limited by the platform. ### What technology do you use to build storefronts? An open-source commerce core such as MedusaJS, with custom APIs, databases and object storage. The front end is decoupled, and we support deployment on your own cloud with access control, backups, logging, monitoring and canary releases. ### Which payment and logistics providers can you integrate? Payments: Stripe, PayPal and local methods, with order validation and anomaly blocking to reduce transaction risk. Logistics: carriers, warehouse systems and shipping-rate rules, with fulfillment sync and shipment tracking. ### Do you support multiple languages, currencies and markets? Yes, including localized content, currency display, tax rules, shipping options and region-specific marketing, for brands serving several overseas markets at once. ### Website Performance Optimization (Core Web Vitals) Page: https://fxweb.dev/wpo/ Performance audits around Core Web Vitals (LCP, INP, CLS, TTFB): we optimize images, JavaScript, CSS and fonts, caching and CDN, and track results with Lighthouse / PageSpeed and real user monitoring (RUM). For: Teams with an existing site or Shopify store who want better speed, SEO and conversion without a rebuild. Capabilities: - Performance baseline: Lighthouse, PageSpeed Insights, Chrome UX Report and real user data - Loading-chain breakdown: find TTFB, render-blocking, third-party script and image bottlenecks - Optimization of images and media, JavaScript size, CSS and fonts, caching and CDN - Shopify store performance: theme code, third-party app scripts, images - Technical SEO and accessibility: semantic markup, structured data, crawlability, mobile UX - Before / after metrics and funnel comparison, with regression checks on later releases #### Website Performance Optimization (Core Web Vitals) — FAQ ### What are Core Web Vitals and why do they matter? Core Web Vitals are Google's metrics for real user experience: LCP (Largest Contentful Paint, loading speed), INP (Interaction to Next Paint, responsiveness) and CLS (Cumulative Layout Shift, visual stability). They affect bounce and conversion rates, and are a search ranking factor. ### How does a performance optimization project run? We set a baseline with Lighthouse, PageSpeed and real user data, and break down the loading chain to find bottlenecks. Then we fix them by priority: images and media, JavaScript size, CSS and fonts, caching and CDN. Finally, we keep tracking metrics so later releases do not regress. ### Can Shopify stores be optimized too? Yes. Shopify speed problems usually come from theme code, too many third-party app scripts and unoptimized images, and all of these can be fixed at the theme level. ### How do you measure the results? We compare LCP, INP, CLS, TTFB and other metrics before and after, using Lighthouse / PageSpeed reports and real user monitoring (RUM), and check conversion funnel data for business impact, not just lab scores. ### Does performance optimization help SEO? Yes. Beyond speed, we improve semantic structure, crawlability, structured data and mobile experience so search engines can understand and index your pages more efficiently. ### Cross-border E-commerce VAT Compliance Systems Page: https://fxweb.dev/vat/ VAT compliance systems for VAT service providers, tax agents and cross-border sellers (we do not file returns ourselves): registration / agent transfer applications, a tax engine that parses the Amazon VAT Transactions Report, a filing and payment workbench, and EPR and authorized representative modules for the UK and 8 EU countries: Germany, France, Italy, Spain, Poland, Czech Republic, Netherlands and Austria. For: VAT service providers, tax agents and cross-border teams turning tax services into an online product. Capabilities: - Multi-step VAT registration / agent transfer applications: OCR of business licenses and IDs, e-signature via mobile QR code - Tax engine: parses the Amazon VAT Transactions Report and classifies sales by withholding party, buyer VAT number and departure / arrival country - Country rules for the UK, Germany, France, Italy, Spain, Poland, Czech Republic, Netherlands and Austria; C79 / C88 deduction and PVA postponed accounting; every box of the UK VAT Return - Filing and payment workbench: status workflow, bulk report import, payment vouchers and receipts - EPR registration and batch filing (packaging laws in Germany, France and Spain, WEEE, German battery law), EU / UK authorized representative services - Operations back office: orders, reviews, role-based permissions, audit logs, daily exchange rates #### Cross-border E-commerce VAT Compliance Systems — FAQ ### What exactly is your VAT solution? We do not file VAT returns. We build VAT compliance systems for VAT service providers, tax agents and cross-border teams: a seller-facing site to present and order services, plus back-office workflows for registration, tax calculation, filing and payment. Complex tax services become a product sellers can understand and buy. ### Which modules can the system include? Mix and match: registration / agent transfer applications (OCR, QR e-signature); tax calculation from the Amazon VAT Transactions Report (C79 / C88 deduction, C88 / PVA postponed accounting); a filing and payment workbench; EPR (packaging, WEEE, batteries); authorized representatives; and an admin with reviews, permissions and audit logs. ### Which countries' tax rules are supported? Tax rules are in production for the UK and 8 EU countries: Germany, France, Italy, Spain, Poland, Czech Republic, Netherlands and Austria, including every box of the UK VAT Return. Cross-border logic for all 27 EU member states is built in. We can add other countries to fit your scope. ### Can it integrate with our existing business systems? Yes. It imports the Amazon VAT Transactions Report for tax calculation and connects to third-party services such as OCR, object storage and exchange rates. We define integrations with your existing systems during requirements. ### How does a project usually proceed? We review your business documentation and service processes (countries, services and internal workflow), design the seller-facing service pages and ordering path alongside the back-office workflows, then build and launch module by module. ## Case studies Case studies page: https://fxweb.dev/cases/ ### Tax compliance SaaS: seller portal and operations back office - Link: https://fxweb.dev/cases/#vat-compliance-saas - Client: A cross-border tax compliance service provider (Cross-border tax services) - Services: VAT Solutions, Custom Systems - Delivered: 2026-08 - Live site: https://service.hwtax123.com/ - Stack: React 19, TypeScript, TanStack, Koa, MySQL, Alibaba Cloud OCR / OSS, Playwright We built a compliance platform from scratch for VAT registration / agent transfer, tax calculation, filing, payment, EPR and authorized representatives. Sellers now order and track services online. **Challenge:** The provider collected documents by hand, calculated tax manually and passed spreadsheets around. With many countries, tax types and rules, sellers could not follow progress and operations were slow and error-prone. **Solution:** - Multi-step seller applications with OCR of business licenses and IDs and e-signature via mobile QR code, cutting manual entry - Parses the Amazon VAT Transactions Report into 7 sales categories, with tax rules for the UK and DE, FR, IT, ES, PL, CZ, NL, AT - C79 / C88 input VAT deduction and C88 / PVA postponed accounting, with every box of the UK VAT Return generated automatically - EPR registration and batch filing (DE/FR/ES packaging, WEEE, German batteries), authorized representatives and daily exchange rates - Operations back office with orders, filing and tax review, role-based permissions and audit logs **Results:** - Live in production, with 300+ iterations shipped in about 4 months - About 44 business pages, 77 API endpoints and 19 data models - 20 end-to-end tests plus a pre-release schema diff to protect tax data accuracy ### Four-party supply chain order tracking, launched in 15 days - Link: https://fxweb.dev/cases/#b2b-supply-chain-portal - Client: An overseas sourcing agent (Cross-border sourcing / supply chain) - Services: Custom Systems - Delivered: 2026-10 - Live site: https://chaingo.feixingtech.cn/ - Stack: React 19, TypeScript, TanStack, Koa, SQLite / Drizzle, Caddy, Playwright An order, production and logistics platform linking overseas merchants, Chinese factories and freight forwarders, replacing scattered group chats with one order timeline. **Challenge:** Few orders but high value, shipped by sea, air, rail or express. Order, production and logistics updates lived in group chats and spreadsheets, so overseas merchants lost track of progress. **Solution:** - Four roles (admin, merchant, factory, logistics) with strict data isolation between merchants - Order splitting and partial shipments across order → batch → delivery → shipment, with countdowns and overdue alerts - 17TRACK API integration: automatic tracking, manual updates by logistics staff and a daily fallback sync - SKUs generated from option combinations, inventory ledger, price history and Excel bulk import / export - Chinese, English and French UI, order lock after receipt, human verification and request audit logs **Results:** - Requirements to launch in 15 days, in 46 commits - About 83 API endpoints, 34 front-end pages and 19 database tables - About 25 end-to-end, integration and unit test files, with build and tests run before every push ### B2B export site performance: homepage TTFB 17.96s → 0.94s - Link: https://fxweb.dev/cases/#b2b-site-performance - Client: An LED lighting manufacturer (LED lighting / B2B export) - Services: Web Performance - Delivered: 2026-09 - Live site: https://www.trieco-led.com/ - Stack: PHP, ThinkPHP, MariaDB, Nginx / Brotli, Alibaba Cloud CDN, Lighthouse We diagnosed and optimized a PHP B2B site hosted in Germany, layer by layer through the database, video, images and front-end assets, cutting homepage response time and page weight. **Challenge:** The site ran in Germany but its database sat in Hong Kong, so every request crossed continents. The banner video was nearly 40MB, images were not responsive, mobile first paint took tens of seconds and some admin queries hit 502s. **Solution:** - Moved the database from Hong Kong to the German server, removing intercontinental query latency - Transcoded the banner video from HEVC to H.264 720p, with a poster image and lazy loading - Image CDN resizing with srcset and WebP, width / height placeholders, and loading on viewport entry - Merged 17 JS files into 4 with defer, versioned static assets for long CDN caching, restored font-display: swap - Scanned 187 pages for desktop and mobile JS errors **Results:** - Homepage TTFB 17.96s → 0.94s; 10 admin requests 208.7s → 12.1s; the query that hit 502 now returns in 1.43s - Homepage video size 38.8MB → 2.73MB (mobile) - Homepage mobile image download 22.7MB → 241KiB (-99%) - Lighthouse desktop (median of 3): home 56 → 88, LCP 6.5s → 1.5s; product page 44 → 91, CLS 0.287 → 0.008 ### Shopify loyalty program linking the DTC store and brand app - Link: https://fxweb.dev/cases/#shopify-loyalty-program - Client: A smart fitness equipment brand (Smart fitness) - Services: Shopify Development - Live site: https://www.speediance.com/pages/loyalty - Stack: Shopify Liquid, Alpine.js, Shopify Customer Accounts, REST API A custom loyalty club built into the Shopify theme: member center, points tasks, points history, coupon redemption and app account linking, with no third-party loyalty app. **Challenge:** The brand runs a Shopify DTC store and its own app. Third-party loyalty apps could not connect to app accounts or the brand's back end, so member benefits were split between web and app. **Solution:** - 6 sub-pages on custom sections and Alpine.js: landing page, member center, points history, coupons, account linking and more - Points for sign-ups, email opt-ins, social follows, photo reviews, accessory purchases and birthdays, credited via callbacks - Coupon center with claim limits, balance checks and one-click code copy - Shopify accounts linked to app accounts via email code, so points and benefits work in both - One codebase that switches API endpoints and language per store for multi-region sites **Results:** - Live on the US and EU stores - Built entirely in the Shopify theme, with no loyalty app subscription fees ### Shopify build for an energy brand across product lines and markets - Link: https://fxweb.dev/cases/#energy-storage-shopify-store - Client: A renewable energy storage brand (Renewable energy / energy storage) - Services: Shopify Development - Live site: https://www.calionpower.com/ - Stack: Shopify, Dawn, Liquid, Tailwind CSS, Shopify Markets A Shopify site and store for a brand selling home storage, C&I storage, inverters and EV chargers, handling both retail orders and B2B inquiries. **Challenge:** The range spans retail EV chargers to containerized storage that needs an inquiry. The site also had to serve the US and India, each with its own currency and domain. **Solution:** - Customized Shopify's Dawn theme, with Tailwind CSS for custom components - 4 product lines and 11 sub-categories: retail items sold directly, large storage routed to downloads and inquiries - Shopify Markets for the US (USD) and India (INR), with a separate India domain and hreflang - Custom carousel, tab and video sections with ARIA semantics; responsive, lazy-loaded images; font preloading - GA4, Ahrefs analytics and WhatsApp live chat **Results:** - Live in the US and India markets ### Our site from Next.js to Qwik: mobile Lighthouse 97–100 - Link: https://fxweb.dev/cases/#feixingtech-qwik-migration - Client: FXTech website (in-house project) (Corporate website) - Services: Web Performance - Delivered: 2026-03 - Live site: https://fxweb.dev/ - Stack: Qwik, Qwik City, Vercel Edge, Tailwind CSS, Lighthouse We moved our site from Next.js to Qwik on Vercel Edge, rebuilding performance and SEO around SSR and on-demand loading, with full content readable by AI search. **Challenge:** A marketing site is mostly content, but typical framework JavaScript slows first paint and interaction. Search engines and AI crawlers also need the full content without running JS. **Solution:** - Qwik's resumable architecture on Vercel Edge, with almost no JavaScript run on first load - Responsive images, deferred third-party scripts, CDN cache headers on pages and data, and link prefetching - Site-wide JSON-LD (Organization / FAQPage / case studies) plus an llms.txt - Sitemap generated from routes, with changed pages pushed to Baidu after each deploy **Results:** - Lighthouse mobile (home, Shopify and contact pages, 3 runs each): performance 97–100 - TBT 0–10ms, CLS 0, LCP 1.4–2.6s ### EU VAT compliance AI assistant, launched in 6 days - Link: https://fxweb.dev/cases/#eu-vat-ai-assistant - Client: A cross-border e-commerce compliance AI product (Cross-border e-commerce / AI) - Services: AI Applications, VAT Solutions - Delivered: 2026-07 - Stack: React 19, TypeScript, Express, PostgreSQL, DeepSeek, Vercel, GitHub Actions A Chinese-language Q&A assistant for small cross-border sellers that answers EU VAT, OSS / IOSS and EPR questions with cited sources, backed by an auto-updated regulation base. **Challenge:** Small sellers have no tax staff, and EU rules are scattered across official sites in many languages. General-purpose LLMs often get compliance questions wrong and cannot cite sources. **Solution:** - Weekly crawl of 8 official sources (tax authorities of DE, FR, UK, ES, IT, NL, PL and the EU VAT Directive), MD5 incremental updates - PostgreSQL full-text search that matches multilingual regulations to questions asked in Chinese - Strict prompts: low temperature, required citations and effective dates, source links and a disclaimer - SSE streaming, adapted for serverless deployment **Results:** - Built in 6 days and 28 commits, usable from day one ## Company FAQ ### What kind of company is FXTech? FXTech (Shenzhen Feixing Keyao Technology Co., Ltd.) is a Shenzhen e-commerce engineering agency and Shopify Partner. We help cross-border sellers and global brands with Shopify / Shopify Plus development, headless DTC storefronts, web performance optimization and cross-border VAT compliance systems. ### Who are your clients? Mostly cross-border sellers and global brands, from early-stage DTC stores to established brands that need custom systems. We have served 100+ clients in fashion, beauty, electronics and home goods. ### Should I build on Shopify or an open-source storefront? If you want to launch fast, run lean and your processes fit the Shopify ecosystem, Shopify / Shopify Plus is usually better. If you need more control over the shopping experience, workflows, data or platform fees, consider a headless storefront on MedusaJS or similar. We recommend based on your stage and team. ### Can you optimize performance without rebuilding the site? Yes. Performance optimization is a standalone service. We set a Core Web Vitals baseline (LCP, INP, CLS, TTFB), find the bottlenecks, optimize images, JavaScript, CSS, caching and CDN on your existing site, and track metrics before and after. It works for Shopify stores and custom sites. ### How do we get started, and how is pricing set? Reach us by Telegram, email or phone on the contact page. We discuss your goals and current setup, then send a proposal and quote based on scope. Customization varies widely between projects, so we do not offer fixed packages. ### Do you work in English and with overseas teams? Yes. We work in Chinese and English and collaborate remotely with overseas operations, design and engineering teams. ## About the team - Senior web engineers: 10+ years of experience across HTML, CSS, JavaScript, PHP and Ruby; deep knowledge of the Shopify architecture and Liquid templates; code and caching optimization for high-traffic stores. - E-commerce storefront experience: 5+ years integrating payment gateways, logistics providers and marketplace platforms. - AI-assisted development: daily use of Cursor and GitHub Copilot, and AI features built into client systems (for example an EU VAT compliance assistant). ## Other pages - About us: https://fxweb.dev/about/ - Contact: https://fxweb.dev/contact/ - Privacy policy: https://fxweb.dev/privacy/ - Terms of service: https://fxweb.dev/terms/ - Short index: https://fxweb.dev/llms.txt