01
Web & Mobile Engineering
High-performance Next.js, React, iOS & Android products built within your timeline.
02
Shopify & B2B Wholesale
Trade-ready WooCommerce & Shopify stores integrated with Xero and EPOS.
03
Technical Website Audits
Evidence-led reviews of stack risk, Core Web Vitals, and integration boundaries.
04
Custom API Integrations
Frictionless data flow across CRM, ERP, Xero, Stripe, HubSpot & custom APIs.
What We Deliver
Built for Operational Reality, Not Slideware.
Whether we are shipping a customer-facing web experience, a native or cross-platform mobile product, or untangling legacy integrations, the bar is the same: measurable performance, maintainable code, and clear ownership.
Not ready for a full build? Start with a Technical Audit—an objective review of your existing website or app stack with prioritized recommendations.
Capabilities & Services
Full-Lifecycle Digital Engineering Services.
From architecture discovery and UI/UX design to custom Next.js applications, iOS & Android apps, Shopify/WooCommerce rebuilds, and Xero/EPOS integrations.
01
Web Development
Tailored websites and web applications built with modern frameworks. Performance, accessibility, and scalability built in.
- Responsive design
- React & Next.js
- Performance & accessibility
- CMS integration
02
Mobile App Development
iOS and Android apps—native or cross-platform—with solid architecture, APIs, and release support for the App Store and Google Play.
- iOS & Android
- Native & cross-platform
- APIs & secure auth
- Store release support
03
Brand & Design
Striking visual identities and design systems that convey your brand with clarity, confidence, and impact.
- Visual identity
- Design systems
- UI/UX design
- Brand guidelines
04
Digital Strategy
Data-driven strategies that align your digital presence with your business goals and drive measurable growth.
- Digital audits
- User research
- Competitor analysis
- Roadmap planning
05
SEO & Performance
Enhance your site visibility in search and attract organic traffic with technical SEO and optimisation.
- Technical SEO
- Core Web Vitals
- Structured data
- Analytics setup
06
Custom Integrations
Connect your website to your existing systems — CRM, e-commerce, APIs — for seamless data flow and growth.
- API integration
- CRM, Xero & ERP
- E-commerce & EPOS
- Payment gateways
07
Support & Maintenance
Ongoing support, updates, and maintenance to keep your site secure, fast, and aligned with growth.
- Security updates
- Performance monitoring
- Bug fixes
- Content updates
08
Technical Website & Stack Audits
A focused, written engineering review of your architecture, Core Web Vitals, security surface, and third-party integration boundaries.
- Architecture & API review
- Core Web Vitals (LCP/INP)
- Security & dependency check
- Prioritised fix roadmap
Clarity Before Commitment
Technical Website & Stack Audits.
Before you commit budget to a rebuild or new vendor, get a written assessment of performance, architecture, accessibility, SEO foundations, and integration risk—so every pound goes to the right work.
Pillar 01
Performance & Core Web Vitals
Real-world load behaviour, asset weight, caching, rendering paths, and mobile responsiveness measured against current search and user expectations.
Pillar 02
Architecture & Integrations
CMS, e-commerce, APIs, accounting, EPOS, and third-party scripts reviewed for failure modes, duplication, and upgrade paths.
Pillar 03
Risk & Roadmap
Security hygiene, dependency health, accessibility gaps, and a pragmatic sequence of fixes—quick wins separated from structural work.
Interactive Audit Scope Estimator
Check any symptoms your team is experiencing to calculate your audit priority:
Audit Readiness Signal
BASELINE
Select any challenges to see your recommended audit focus.
Book Technical Audit
Selected Work & Proof
Engineered Case Studies & Launches.
Real platforms engineered for B2B wholesale networks, multi-location retail, e-commerce brands, and operational web applications.
Wizard Alliance · B2B platforms
B2B wholesale platform, Xero & field sales
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.
EC Pack · B2B platforms
B2B wholesale: WooCommerce, Xero-led stock & accounts
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.
House of Spells · B2C & e-commerce
Shopify rebuild: checkout, EPOS & inventory you can trust
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.
British Souvenirs · B2C & e-commerce
New Shopify store: gifts, souvenirs & seasonal campaigns
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.
Cinereplicas UK · B2C & e-commerce
Design-led Shopify build — UK storefront
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.
Choize · B2C & e-commerce
New Shopify lifestyle store — brand to checkout
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.
Werwing · Corporate & consulting
WordPress site for study-abroad consultancy — requirements-led build
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.
Airotreat · Corporate & consulting
WordPress corporate site — industrial air quality
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.
Collaborators & Clients
Trusted by Ambitious Teams Across the UK & Beyond.
Organisations that rely on Codestern for mission-critical e-commerce, wholesale portals, and custom web applications.
50+
Clients Empowered
100+
Completed Projects
5+
Countries Served
5+
Years Experience
Our Goal & Philosophy
Engineered for Scale, Speed & Longevity.
We combine senior engineering discipline with transparent commercial execution.
Our Value
At Codestern, integrity, innovation, and excellence are the foundational pillars that guide all our operations. We maintain the highest standards of transparency and accountability in every project. Our approach is to consistently exceed expectations, ensuring every client experience is exemplary. By fostering a culture that values ethical practices and creative solutions, we deliver outstanding results that make a significant impact on our clients' success.
- ✓Highest standards of transparency and engineering accountability
- ✓Ethical practices paired with durable, creative technical solutions
- ✓Measurable commercial impact across web, mobile, and B2B platforms
How We Work
From Idea to Launch in 4 Clear Phases.
A transparent, structured methodology that keeps every project on track and aligned with your goals.
01
Discovery
Goals, constraints, and systems context — including technical audits when you need clarity before build.
02
Design
Wireframes, visual design, and UX flows. We iterate until the direction is right.
03
Develop
Web and mobile builds with clean code and modern tooling—rigorous testing, performance, and accessibility. Store-ready iOS & Android when your roadmap needs them.
04
Launch
Deploy, optimise, and hand over. We stay with you for support and growth.
Client Stories
What Clients Say About Working With Us.
Verified feedback from directors, founders, and operations leads across our e-commerce, B2B, and web application engagements.
★★★★★
“Codestern built our platform from the ground up. The team understood our vision from day one and delivered beyond expectations.”
★★★★★
“Professional, responsive, and technically superb. Our site loads fast and our conversion rate has improved significantly.”
★★★★★
“They turned our outdated site into a modern, accessible experience. The process was smooth and collaborative.”
★★★★★
“Outstanding work from start to finish. Codestern delivered a professional site that has helped us grow our business significantly.”
★★★★★
“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. Our field team can finally place orders with confidence on site, and the lift in sales spoke for itself.”
★★★★★
“Codestern built us a B2B site on WooCommerce that respects our stock and accounts in Xero 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.”
Common Questions
Frequently Asked Questions.
Quick answers to common questions about how we scope, engineer, integrate, and support digital products.
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.
Codestern is based at 11 Shambles, York, YO1 7LZ, United Kingdom. We work with clients across the UK and internationally, mostly remotely with video calls and shared tools.
Email hello@codestern.co.uk, call +44 7767 576110, or use the contact form at /contact. For a technical audit, visit /technical-audit.
React, Next.js, TypeScript, Shopify, WooCommerce, WordPress, Swift, Kotlin, and cross-platform mobile frameworks. Integrations include Xero, Stripe, HubSpot, EPOS systems, and custom APIs.
Yes. We build and rebuild B2C Shopify stores and B2B WooCommerce wholesale platforms, including checkout, inventory, EPOS sync, and Xero-led stock and accounts.
Yes. Codestern offers structured technical audits covering architecture, integrations, performance, Core Web Vitals, security basics, and a prioritised roadmap.
We provide fixed quotes for defined projects and hourly rates for support, maintenance, or scope changes. We outline costs clearly before work begins.
Timelines depend on scope. A simple marketing site may take 4–8 weeks; custom web apps and B2B platforms typically run several months. We provide a schedule as part of the proposal.
Yes. We can audit, redesign, or extend existing sites. We also take over maintenance for sites built by other agencies.
Insights & Ideas
Latest from the Codestern Blog.
Practical guides on web performance, conversion design, accessibility, CMS selection, and e-commerce architecture.
March 2024
Building performant web applications
Why performance matters for users and business. Practical tips for faster load times, Core Web Vitals, and modern frameworks.
February 2024
Web design trends that convert
Explore design patterns that drive engagement and conversion. From minimal layouts to strategic CTAs.
January 2024
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.
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