# Quality X Portfolio > Published Quality X software work spanning SaaS, e-commerce, education, business operations, real estate, customer platforms, integrations, and modernization. Each project page describes the problem, system behavior, implementation context, and available outcomes. Use the project source rather than inferring facts from a client name alone. ## Published work - [Mayoral — E-Commerce That Scales to Millions of Shoppers in 30+ Countries](https://qualityx.co/en/portfolio/mayoral-ecommerce.md): Mayoral is one of Europe's best-known children's fashion brands. We engineered the backend that lets them sell seamlessly across 30+ countries — multiple currencies, multiple carriers, millions of catalog requests — without performance degr... - [PEAQ Recovery — E-Commerce Where Buying a Product Activates Physical Hardware](https://qualityx.co/en/portfolio/peaq-recovery-ecommerce.md): PEAQ sells cold plunge recovery hardware that talks to a companion mobile app. Buying on the website isn't just a transaction — it triggers device provisioning in a separate system. We built the bridge: async queues that guarantee device ac... - [Allbirds — Fixing the Checkout That Slowed Down Under Traffic](https://qualityx.co/en/portfolio/allbirds-ecommerce-backend.md): Allbirds serves millions of customers globally. Their checkout was inconsistent under traffic spikes — slow SQL joins were the culprit. We diagnosed it, fixed it, and Dockerized the whole stack so "works on my machine" stopped being a phras... - [Kroger — Making Real-Time Local Inventory Fast Across Thousands of Stores](https://qualityx.co/en/portfolio/kroger-grocery-platform.md): Kroger's grocery delivery platform shows you what's in stock at your local store — right now, not yesterday. Doing that fast and accurately at scale is harder than it sounds. We fixed the database bottlenecks that were making it slow. - [Nutricook World — A Gulf Kitchen Brand That Never Has a Slow Checkout](https://qualityx.co/en/portfolio/nutricook-ecommerce.md): Nutricook runs flash sales and promotional campaigns that spike traffic overnight. Their checkout used to slow down exactly when it matters most. We moved everything heavy to background queues — the checkout endpoint now returns in under 30... - [Keto Kartel — Subscription Commerce Without the Double Charges and Data Chaos](https://qualityx.co/en/portfolio/keto-kartel-subscription.md): Subscription businesses are complex: customers upgrade, pause, skip weeks, swap products, and cancel mid-cycle. Keto Kartel's original system couldn't handle these state changes cleanly — double charges and inventory errors were a regular o... - [Yeprem Jewellery — Selling Luxury Online Without Overselling or Losing Trust](https://qualityx.co/en/portfolio/yeprem-jewellery-ecommerce.md): A piece of jewellery can sell in a boutique while a customer is mid-checkout online. For a luxury brand, that's a serious problem — not just a logistics headache. We built real-time ERP sync and database-level transaction locking that makes... - [OSOSS (zFloos) — A Multi-Tenant SaaS That Got 30% Faster Without New Hardware](https://qualityx.co/en/portfolio/ososs-zfloos-saas.md): OSOSS's zFloos platform serves thousands of Saudi businesses on shared infrastructure. As the tenant count grew, API performance degraded. We delivered a 30% performance improvement through SQL indexing and Redis — no infrastructure changes... - [Dentalia — Appointment Scheduling for 65 Clinics That Finally Has Zero Double Bookings](https://qualityx.co/en/portfolio/dentalia-scheduling-platform.md): Dentalia runs 65+ dental clinics across Mexico. Their old scheduling system produced double bookings when two patients tried to book the same doctor slot simultaneously. Database-level pessimistic locking eliminated the problem. Zero double... - [Mdares.ai — A National Education Directory That Searches 100+ Filters Instantly](https://qualityx.co/en/portfolio/mdares-ai-directory.md): Saudi Arabia's national education directory. Finding the right school or course across hundreds of parameters — location, specialty, price range, certification type, enrollment status — needs to feel instant. We built the search engine that... - [Crayon — Enterprise B2B Platform That Ships Updates Daily Without Breaking Anything](https://qualityx.co/en/portfolio/crayon-enterprise-b2b.md): Enterprise clients want two things that feel contradictory: granular control over who can see and do what, and a platform that gets better regularly without unexpected downtime. We delivered both — a composable RBAC system and a CI/CD pipel... - [Taqeef — B2B Quoting That Stopped Producing Wrong Prices](https://qualityx.co/en/portfolio/taqeef-b2b-ecommerce.md): Taqeef's B2B quoting had 40+ pricing permutations across customer tiers, volume bands, and product categories — all implemented as hardcoded conditions spread across the codebase. Wrong quotes went out regularly. We replaced it with a confi... - [Shanashel — Property Search Across Millions of Listings That Returns in Under 500ms](https://qualityx.co/en/portfolio/shanashel-real-estate-platform.md): Search across millions of regional properties filtered by location, price, type, and geographic bounds — and get results in under 500ms. Agents upload photos and walk away; processing happens in the background and the listing goes live auto... - [Taptok — Scaling a Multi-Tenant SaaS to 100K+ Monthly Transactions on AWS](https://qualityx.co/en/portfolio/taptok-saas-platform.md): Taptok's digital business card platform was approaching the limits of a single-database architecture. Analytical queries were competing with transactional queries, and both were getting slower. We built tenant-based database sharding, decou... - [Kemal Ağa — Shipping Gaziantep's 77-Year-Old Confectionery Heritage to 40+ Countries](https://qualityx.co/en/portfolio/kemalaga-confectionery-ecommerce.md): Kemal Ağa has been making Gaziantep's finest pistachios and chocolates since 1947. Going international meant solving a problem most e-commerce builds never face: cold-chain requirements. Not every product can ship to every country via every... - [Zeroday Camp — A Coding Bootcamp Platform Where Students Actually Write Code (And Stay Accountable)](https://qualityx.co/en/portfolio/zeroday-camp-learning-platform.md): Most online coding courses are videos with a quiz at the end. Zeroday Camp is different — students write real code in a Monaco editor with live preview, work through 29 structured modules, and their engagement is tracked in real time via ca... - [Mukhmal Perfumes — How a Boutique Perfume Store Sells Scent Through a Screen](https://qualityx.co/en/portfolio/mukhmal-perfumes-ecommerce.md): You can't smell a perfume through a screen — so what makes someone trust a boutique brand enough to buy online? Story, atmosphere, and a purchase experience that feels as considered as the product. We built Mukhmal's store around that insig... ## Start a project - WhatsApp: https://wa.me/905392376734 - Contact: https://qualityx.co/en/contact