Interjar: Specialist Magento Development Company

Interjar is a specialist Magento development company - it's all we do. We work exclusively with Magento 2, Adobe Commerce, and the Hyvä frontend, so every developer on our team has deep, focused expertise rather than surface-level knowledge across multiple platforms.

Our team holds Adobe Certified Professional and Adobe Commerce Developer credentials, and as an Adobe Silver Solution Partner, we have direct access to Adobe's engineering team for complex platform issues. We have delivered Magento projects across retail, multi-channel, and enterprise commerce for brands including Sosandar, Joanie Clothing, Dinny Hall, and Tieroom.

When you hire a Magento developer from Interjar, you get direct access to the senior developer assigned to your project. Every hour is billed transparently to the minute at £100/hour.

Our UK Magento developers work remotely with clients in London, Manchester, Birmingham, Leeds, Bristol, Edinburgh, and beyond, from our Chester base. Every project is delivered by a team of senior developers, with day-to-day communication going direct to the developers writing your code and an account manager handling commercial matters in the background. Time is billed in one-minute increments and you only pay for code that ships.

Our Services

Magento Migrations

Seamless platform migrations from Magento 1 to 2, version upgrades, or migrations from other e-commerce platforms. Complete data preservation with zero downtime.

  • Key Features:

Wholesale and Trade Builds

For wholesale, distribution, and trade-account projects, our specialist team handles the dedicated build. See full capabilities, case studies, and pricing on our B2B page.

  • Key Features:

Custom Extension Development

Bespoke Magento extensions tailored to your specific business needs. From payment gateways to inventory management systems.

Theme Development & Redesigns

Complete custom theme development or major redesigns. Mobile-first, conversion-optimized designs built for performance.

Third-Party Integrations

Complex integrations with warehouses, PIMs, ERPs, marketing automation, and other business-critical systems.

Joanie Clothing

Migration, Custom Integrations, Theme Development

Challenge:

Complete platform migration from Magento 1 to 2 with custom theme development and complex third-party integrations

Solution:

Full-scale redevelopment with bespoke integrations and automated business processes

Results:

  • 65% faster page load times after migration
  • 300% business growth over 3 years on the new platform
  • Theme redevelopment with custom Torque WHMS integration
  • Automated refund process and Advanced Commerce search
  • International expansion with Global-e shipping View Full Case Study

Sosandar

Migration, Multichannel Integration, Custom Development

Challenge:

Complex migration from Magento 1 with advanced multichannel integration and intelligent merchandising requirements

Solution:

Complete platform redevelopment with sophisticated third-party integrations and automated business processes

Results:

  • 99.9% uptime maintained for AIM-listed retailer with £40M+ revenue
  • 85% faster refund processing through intelligent automation
  • Migration from Magento 1 with theme redevelopment
  • Multichannel integration with Next and bricks-and-mortar stores
  • Custom merchandising, waitlist, and reporting solutions View Full Case Study

Our Process

  1. Discovery & Planning
    Comprehensive requirements gathering, technical architecture planning, and project roadmap creation.
  2. Design & Prototyping
    UX/UI design, technical prototypes, and detailed specifications with client approval.
  3. Development & Testing
    Iterative development with regular demos, comprehensive testing, and quality assurance.
  4. Deployment & Training
    Staged deployment, team training, documentation, and post-launch support setup.

Why Choose Interjar?

  • Expert Developers:
    15+ years combined Magento experience with Adobe Commerce certification
  • Proven Methodology:
    Structured development process with quality assurance at every step
  • Performance Focused:
    Every project optimized for speed, scalability, and user experience
  • Transparent Communication:
    Regular updates, demos, and direct developer access throughout

If you are looking for Magento developers in the UK rather than offshore contractors, Interjar's team is built for you. Every Magento developer on the team is UK-employed, Adobe Commerce certified, and works exclusively on Magento and Adobe Commerce, no rotations onto WordPress or generic PHP.

Typical Magento Agency vs Interjar

Typical Magento Agency

  • Mixed Magento and non-Magento work, juniors learning on your store
  • Account managers between you and the developer
  • Tiered pricing and minimum monthly retainers
  • Extension installs, no real platform expertise
  • Offshore "delivery" with UK-priced sales
  • Lock-in contracts of 12 months or longer

Interjar, Adobe Silver Solution Partner

  • 100% Magento and Adobe Commerce work, senior certified developers
  • Direct developer communication, account manager handles commercial
  • Flat £100/hour, no minimums, billed to the minute
  • Module architecture, performance, security, and DevOps in-house
  • UK-based and UK-employed, Chester HQ
  • 30-day rolling contracts, you keep your code and hosting

Testimonials

Chris Horridge
Director, Expert Electrical
"As a team of professional developers, Interjar consistently deliver exceptional results, helping to seamlessly transform my vision into a fully-functional, user-friendly online platform. Interjar are a pleasure to work with. Their professionalism and friendly demeanour have made the collaboration process both enjoyable and efficient."

Sarah Gallagher
Head of E-commerce, Joanie Clothing
"We really enjoy working with Interjar; the communication is great and the team are flexible and knowledgeable, using their Magento experience to recommend the best solutions for the site. We know we can always rely on them!"

Frequently Asked Questions

  • How long does a typical Magento project take?
    It depends on scope. A custom integration or module might take 2-4 weeks, while a full site build or major migration typically takes 2-4 months. We'll give you a realistic timeline upfront after scoping your requirements.
  • Can you work with our existing Magento store?
    Yes. Most of our development work involves extending and improving existing Magento stores, adding new features, building custom integrations, fixing performance issues, and migrating from older versions.
  • Do you build custom Magento extensions?
    We do. From bespoke checkout flows to ERP integrations and custom order management, we build extensions tailored to your business requirements rather than forcing you into off-the-shelf solutions that don't quite fit.
  • How do you ensure quality during development?
    Every project goes through code review, automated testing, and staging environment validation before anything touches your live site. We use GitLab CI/CD pipelines for consistent, zero-downtime deployments.
  • Can you integrate Magento with our existing systems?
    Absolutely. We regularly integrate Magento with ERPs, CRMs, payment gateways, shipping providers, and marketing platforms. Our Advanced Commerce integration framework handles complex multi-system orchestration.
  • What happens after the project launches?
    Many of our development clients transition to a monthly retainer for continued maintenance, monitoring, and iterative improvements. For ongoing maintenance see our Magento support page; for major version moves see Magento upgrades.
  • How do I choose a Magento development company?
    Look for Adobe partnership status (we're a Silver Solution Partner), verified Magento 2 expertise with Adobe-certified developers, case studies with measurable results, UK-based teams rather than offshore, and direct developer access rather than account-managed communication.
  • Can I hire a Magento developer on a project basis?
    Yes. We offer both project-based engagements for defined scopes of work and flexible retainer arrangements for ongoing development. All work is billed at £100/hour to the minute, with no minimum commitment and rolling 30-day contracts.
  • How much do Magento developers in the UK charge?
    Our developers work at a flat £100 per hour. We bill in one-minute increments and there are no tiered packages or retainers required to start.
  • Are your Magento developers certified?
    Yes. Interjar is an Adobe Silver Solution Partner and our senior developers hold Adobe Commerce certifications. This means we receive direct engineering support from Adobe and early access to platform updates.
  • Do you work with businesses outside Chester?
    Yes. We are based in Chester but the majority of our Magento development work is delivered remotely for clients across the UK, Ireland, and mainland Europe.
  • Can I hire a single Magento developer rather than a full team?
    We assign a team of senior developers to every project, with day-to-day communication going direct to the developers writing your code. An account manager handles commercial matters in the background.

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