# Codestern — full agent context > Codestern is a York, UK web and mobile development agency. We build high-performance websites, web apps, iOS and Android applications, Shopify and WooCommerce stores, B2B wholesale platforms, and custom integrations (Xero, EPOS, CRM, APIs). We also offer technical audits, SEO, digital strategy, and ongoing support. ## Contact - Email: hello@codestern.co.uk - Phone: +44-7767-576110 - Address: 11 Shambles, York, YO1 7LZ, United Kingdom - Website: https://codestern.co.uk - WhatsApp: https://wa.me/447767576110 ## Keywords - web development agency UK - web development agency York - Next.js development agency - React web development - mobile app development UK - iOS app development agency - Android app development agency - Shopify development agency - Shopify store rebuild - WooCommerce B2B development - B2B wholesale platform development - e-commerce development UK - technical website audit - Core Web Vitals optimisation - Xero integration development - EPOS integration e-commerce - WordPress development agency - custom web application development - API integration development - website support and maintenance - digital strategy consultancy - technical SEO agency ## Services ### Web Development We build websites and web applications using React, Next.js, and other industry-standard frameworks. Projects are structured for performance, accessibility (WCAG 2.1), and scalability. We deliver marketing sites, web apps, and platforms with clear documentation and handover. All work is tested across devices and browsers. Highlights: Responsive design, React & Next.js, Performance & accessibility, CMS integration URL: https://codestern.co.uk/services#web-development ### Mobile App Development We design and build mobile apps for iOS and Android. Depending on your product and constraints, we work natively (Swift, Kotlin) or with cross-platform frameworks so you can ship one codebase to both stores. Engagements typically cover product and UX patterns for mobile, integration with your APIs or existing web backends, authentication and data handling, test builds, and practical support for App Store and Google Play submission. The same engineering standards we apply to web—performance, security, and maintainability—carry through to app work. Highlights: iOS & Android, Native & cross-platform, APIs & secure auth, Store release support URL: https://codestern.co.uk/services#mobile-app-development ### Brand & Design We create visual identities, design systems, and UI/UX for digital products. Deliverables include logos, colour palettes, typography, and component libraries. We produce brand guidelines and design specs so your team or future partners can maintain consistency. Design work is delivered in standard formats (Figma, SVG, etc.). Highlights: Visual identity, Design systems, UI/UX design, Brand guidelines URL: https://codestern.co.uk/services#brand-design ### Digital Strategy We help define your digital roadmap through audits, competitor analysis, and user research. We produce strategy documents, prioritised recommendations, and implementation plans. Our approach is evidence-based and focused on measurable outcomes. Suitable for new projects or existing sites that need direction. Highlights: Digital audits, User research, Competitor analysis, Roadmap planning URL: https://codestern.co.uk/services#digital-strategy ### SEO & Performance We improve search visibility and site performance. Services include technical SEO audits, on-page optimisation, Core Web Vitals improvements, structured data implementation, and analytics setup. We follow Google's guidelines and use established tools (Search Console, Lighthouse, etc.) to measure progress. Highlights: Technical SEO, Core Web Vitals, Structured data, Analytics setup URL: https://codestern.co.uk/services#seo-performance ### Custom Integrations We integrate websites and mobile apps with CRM, e-commerce platforms, payment gateways, and APIs. Integrations are built with security and reliability in mind, using documented APIs and standard protocols. We provide technical documentation and support during handover. Common integrations include Stripe, Shopify, HubSpot, and custom backends. Highlights: API integration, CRM & ERP, E-commerce, Payment gateways URL: https://codestern.co.uk/services#custom-integrations ### Support & Maintenance We provide ongoing support for products we build or inherit—including web and mobile. Services include security updates, dependency updates, bug fixes, content changes, and small feature additions. Support is offered on a retainer or ad-hoc basis. We respond within agreed SLAs and provide clear communication on progress. Highlights: Security updates, Performance monitoring, Bug fixes, Content updates URL: https://codestern.co.uk/services#support-maintenance ## Frequently asked questions ### What does Codestern do? Codestern is a web and mobile development agency based in York, UK. We build websites, web applications, iOS and Android apps, e-commerce stores, B2B platforms, and custom integrations — from discovery through launch and ongoing support. ### Where is Codestern based? Codestern is based at 11 Shambles, York, YO1 7LZ, United Kingdom. We work with clients across the UK and internationally, mostly remotely. ### How do I contact Codestern? Email hello@codestern.co.uk, call +44 7767 576110, or use the contact form at https://codestern.co.uk/contact. For a technical audit, visit https://codestern.co.uk/technical-audit. ### What technologies does Codestern use? React, Next.js, TypeScript, Shopify, WooCommerce, WordPress, Swift, Kotlin, and cross-platform mobile frameworks. Integrations include Xero, Stripe, HubSpot, EPOS systems, and custom APIs. ### Does Codestern build Shopify and WooCommerce stores? Yes. We build and rebuild B2C Shopify stores and B2B WooCommerce wholesale platforms, including checkout, inventory, EPOS sync, and Xero-led stock and accounts. ### Does Codestern offer technical audits? Yes. Codestern offers structured technical audits covering architecture, integrations, performance, Core Web Vitals, security basics, and a prioritised roadmap. See https://codestern.co.uk/technical-audit. ### How does Codestern charge? Fixed quotes for defined projects; hourly rates for support, maintenance, or scope changes. Costs are outlined clearly before work begins. ### What is Codestern's typical project timeline? A marketing site may take 4–8 weeks; custom web apps and B2B platforms typically run several months depending on scope. A schedule is provided in the proposal. ## Case studies ### Wizard Alliance **B2B wholesale platform, Xero & field sales** · UK B2B wholesale — fandom & licensed goods Wizard Alliance is a UK B2B wholesaler in the fandom space. They needed a trade-ready platform before going to market—from zero customers to 300+ active accounts—with WooCommerce-quality ordering plus deep wholesale rules, Xero, and a field sales channel that simply did not exist off the shelf. Stack: WooCommerce, WordPress, B2B wholesale, Xero integration, Custom B2B rules, Sales agent app, Performance & scale URL: https://codestern.co.uk/case-studies/wizard-alliance > "We were starting from nothing—no site, no digital trade—and Codestern gave us a proper B2B platform before we opened the door to retailers. They understood wholesale: approvals, pricing tiers, MOQs, and how we work in Xero. Our field team can finally place orders with confidence on site, and the lift in sales in those first months spoke for itself." — Wizard Alliance ### EC Pack **B2B wholesale: WooCommerce, Xero-led stock & accounts** · Industrial B2B packaging & supply EC Pack supplies packaging and supply products to trade buyers across the UK. Like many established wholesalers, they had never operated a proper B2B web channel—their teams lived in phone, email, and spreadsheets. The brief was to stand up a serious trade storefront on WooCommerce with the same depth of B2B rules as a larger programme, while treating Xero not only as the finance ledger but as the backbone for inventory truth. Stack: WooCommerce, WordPress, B2B wholesale, Xero inventory & accounts, Custom B2B rules, Integration & performance URL: https://codestern.co.uk/case-studies/ec-pack > "We’re a packaging supplier, not a software company—we needed trade ordering to work the way we already run the business in Xero. Codestern built us a B2B site on WooCommerce that respects our stock and accounts in one place, without asking us to invent a second inventory system. For the first time we have a proper web channel our customers can actually use." — EC Pack ### House of Spells **Shopify rebuild: checkout, EPOS & inventory you can trust** · Licensed retail & collectibles House of Spells sells licensed collectibles and fan merchandise to consumers online. Their previous custom store—built elsewhere—was unstable: frequent crashes, weak UI/UX, broken checkout, and inventory chaos. They needed a faster path to something dependable, so the programme moved to Shopify and rebuilt the storefront and operations from the ground up. Stack: Shopify, B2C e-commerce, EPOS integration, Checkout & payments, Custom pages & SEO, Inventory operations URL: https://codestern.co.uk/case-studies/house-of-spells > "Our old site was a liability—crashes, broken checkout, and stock that never matched reality. Moving to Shopify with Codestern was a full reset: we finally have a store that stays up, looks the part, and talks to our EPOS. The team knows how to run it day to day, and we’re seeing the difference in sales and repeat customers." — House of Spells ### British Souvenirs **New Shopify store: gifts, souvenirs & seasonal campaigns** · Retail souvenirs & gifts British Souvenirs trades gifts and souvenirs for UK and visitor audiences—often across more than one house brand. There was no dependable owned store to match that ambition; Codestern delivered a new consumer Shopify site from the ground up: structure, content, creative, payments, and the back-office habits the team needs to run peak weeks and seasonal pushes. Stack: Shopify, B2C e-commerce, Campaign & collection UX, Checkout & payments, Mobile-first retail, Content & SEO structure URL: https://codestern.co.uk/case-studies/british-souvenirs > "We needed our first serious online shop—not a half-measure. Codestern put us on Shopify with everything built properly from day one: the site, the content, and a checkout customers can trust. The team can update ranges and seasonal pages without chasing developers, which matters hugely when tourist seasons swing." — British Souvenirs ### Cinereplicas UK **Design-led Shopify build — UK storefront** · Entertainment merchandise & collectibles Cinereplicas UK needed a new consumer-facing store—not a rescue of a broken legacy stack—but a clean implementation of a premium entertainment-merchandise experience they had already designed. Shopify was the platform; the work centred on fidelity to that creative, stable checkout, and a flexible catalogue structure for drops and highlights without making public claims about underlying intellectual property. Stack: Shopify, Design-to-production, B2C e-commerce, Theme & templates, Checkout & payments, Performance & accessibility URL: https://codestern.co.uk/case-studies/cinereplicas-uk > "We came in with the design—we needed a partner who could make it real without compromise. Codestern built our UK Shopify store true to that vision, with checkout and mobile behaviour we’re proud of. Launching new collections is now a process, not a crisis." — Cinereplicas UK ### Choize **New Shopify lifestyle store — brand to checkout** · Online lifestyle & retail Choize sells lifestyle products direct to consumers and needed a net-new digital flagship rather than unpicking someone else’s failed build. Codestern stood up a full Shopify B2C store—brand-forward UX, catalogue structure, payments, and the merchandising patterns needed for promos and range growth—aligned with how the business wants to present itself online. Stack: Shopify, D2C e-commerce, Brand & lifestyle UX, Promo & catalogue patterns, Checkout & payments, Handover & training URL: https://codestern.co.uk/case-studies/choize > "We wanted our own store, done properly—not a patch-up. Codestern launched us on Shopify with a site that finally matches our brand end to end. Promotions and new drops are manageable in admin, and checkout just works, which is exactly what we needed at this stage." — Choize ### Werwing **WordPress site for study-abroad consultancy — requirements-led build** · Education consulting (study abroad) Werwing connects students and families with international study opportunities. Their needs for the website were explicit from the outset—messaging, structure, journeys, and conversion points were specified before build. Codestern translated that into a full WordPress corporate site: all pages and blocks the brief called for, editor-friendly patterns, and forms tuned for enquiries across regions and devices. Stack: WordPress, Corporate & editorial UX, Requirements-led IA, Forms & lead capture, SEO & performance, CMS training & handover URL: https://codestern.co.uk/case-studies/werwing > "We knew exactly what we needed the site to do and how we wanted to come across. Codestern built it faithfully on WordPress—every section we scoped—without endless scope creep. Our team can update programmes and destinations in the CMS, which was non-negotiable for us." — Werwing ### Airotreat **WordPress corporate site — industrial air quality** · Industrial environmental solutions Airotreat serves industrial buyers around air quality monitoring, treatment, and related services. The project was led by explicit requirements and design intent—not experimentation mid-flight. Codestern built a complete WordPress corporate site that maps those ideas into production: sector- and service-oriented pages, specialist enquiry routes, and room to expand case-style content over time, without overstating outcomes or obligations to third parties. Stack: WordPress, B2B industrial, Design-led templates, Service & sector IA, Lead & enquiry flows, Performance & accessibility URL: https://codestern.co.uk/case-studies/airotreat > "We had a clear picture of how we wanted to look and what the site needed to cover. Codestern executed it on WordPress page by page—professional, technical where it matters, and straightforward for our team to update. Enquiries land where we expect, and we’re not wrestling the CMS to publish changes." — Airotreat ## Blog - [Building performant web applications](https://codestern.co.uk/blog/building-performant-web-applications): Why performance matters for users and business. Practical tips for faster load times, Core Web Vitals, and modern frameworks. - [Web design trends that convert](https://codestern.co.uk/blog/web-design-trends-that-convert): Explore design patterns that drive engagement and conversion. From minimal layouts to strategic CTAs. - [Why accessibility matters for your business](https://codestern.co.uk/blog/why-accessibility-matters-for-your-business): Accessibility isn't just compliance — it expands your audience and improves SEO. Learn how to build inclusive web experiences. - [Choosing the right CMS for your website](https://codestern.co.uk/blog/choosing-the-right-cms-for-your-website): Headless, traditional, or custom? A practical guide to selecting a content management system that fits your needs. - [Why mobile-first design matters](https://codestern.co.uk/blog/why-mobile-first-design-matters): Most users browse on mobile. Learn why designing for small screens first leads to better experiences for everyone. - [E-commerce best practices for small business](https://codestern.co.uk/blog/e-commerce-best-practices-for-small-business): Selling online doesn't require a huge budget. Key practices for checkout, trust, and conversion on small business stores. - [Content strategy for small business websites](https://codestern.co.uk/blog/content-strategy-for-small-business-websites): What to publish, how often, and when to outsource. A practical approach to content that supports your business goals.