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Cost from $200

Turnkey modules and add-ons

I want to book

We develop custom modules for your business processes: from integrations with payments and CRM to smart recommendations, upsells and automation. We integrate without breaking the core, maintain compatibility with updates and speed up the site through clean code and optimization.

Ready-made developments and a streamlined funnel allow you to launch solutions quickly - with documentation, tests and support. As a result, you get functionality that actually increases conversion and average check, and not just a “tick” in the list of features.

What problems do add-ons solve?

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    Increase conversion

    Personalized offers, fast checkout, and on-page upsells — fewer drop-offs at every step.

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    Saving SEO traffic

    URL mapping, 301 redirects, meta tag transfer, and micro-markup — organic traffic is not lost and continues to grow.

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    Readiness for growth

    Modular architecture, scalability, PWA/mobile features — easily add sections and launch new markets.

Plugin development stages

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    Development

    We create an add-on taking into account your requirements.

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    Launch

    We install the modification on the production site and provide further technical support.

Have any questions?

Let's discuss them today
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Why us?

  • 001

    Transparent terms of cooperation.

    We conclude an agreement with guarantees and obligations.

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    Flexible payment concept

    Pay for the work in stages as the project progresses.

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    Regular feedback

    In communication channels that suit you.

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    Report on each stage of work

    You have the opportunity to control the result in real time.

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    Training to use the site

    Consultations and recommendations after launch.

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    Demo version of the site's administrative panel

    Test access to familiarize yourself with the operation of the CMS.

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    Maximum involvement in your business

    We delve into business processes and develop a selling design.

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    Licensed software

    We use only licensed software for your project.

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    Original design and individual development

    Clean code, responsive and adaptive design for your audience.

Prices for modules and custom modifications

Development optionsCreation timePrice
Mini revisionFrom 1 weekfrom $200
Module - standardFrom 2 weeksfrom $600
Plugin with admin interfaceFrom 3 weeksfrom $1 200Extra
Add-on with integrationsFrom 4 weeksfrom $2 000Extra
Enterprise add-onFrom 2 monthsfrom $5 000Extra

Frequently asked questions about custom plugin development

What is included in the development of an add-on?
Brief and requirements development, assessment and plan; module development taking into account platform versions; integration (payment/delivery/CRM if necessary); tests (functional/regression); documentation and instructions; assistance in installation/configuration; warranty support after launch.
How much does development cost?
Price depends on volume and integrations. Guidelines: mini-rework – $200–400; medium complexity module - $600–1,500; complex module with integrations/admin-UI - $2,000–6,000+. Fixed price according to technical specifications or Time&Materials according to the rate - choose the format for the task.
How long will it take?
Minor edits – 2–5 business days; medium difficulty module - 1–3 weeks; complex solutions with integrations - 4–8 weeks. We clarify the deadline after the brief and fix it in the work plan.

Three simple steps to get a free estimate for your project

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Download and fill out the brief

Fill out the form and a file with a brief will become available for downloading.

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Send the brief to us by email

The mail to which we are waiting for your completed brief — sales@maxi-cart.com

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Get a free estimate of the cost of your project

No payment required. Our manager will contact you to discuss additional questions if any arise.

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Get the project of your dreams

No prepayments, stage-by-stage payment for the project. Any number of edits. Our team is in touch every day.

Receive a brief for the task you are interested in

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Didn't find the service you need? Contact us in chat and we will help you find a solution!

Turnkey plugin development

Need a feature that isn’t available “out of the box”? We’ll develop a custom module for your business processes — from quick tweaks to complex integrations with payments, delivery, CRM/ERP, and analytics. We write clean, maintainable code with regard to platform versions and store load.

What you get

  • Functionality for the task: upsells, promo mechanics, pricing rules, custom checkout, PWA features, storefront widgets.
  • Integrations: payment gateways, delivery services, marketplaces, CRM/ERP/DWH, webhooks and REST/GraphQL API.
  • Performance & SEO: caches (Redis), DB indexes, lazy-load, structured data, clean URLs.
  • Admin UI: settings pages, roles and permissions, bulk actions, import/export.
  • Security & quality: validation, logging, automated tests, compatibility checks.

How we work

  1. Brief: define goals, constraints, and KPIs; agree on the scope and estimate.
  2. Development: architecture, code, migrations, integrations.
  3. Testing: functional/regression tests, staging demo.
  4. Launch & support: deploy, monitoring, warranty/updates.

Why us

  • E-commerce expertise: we know the usual pain points (conversion, AOV, LTV) and solve them in code.
  • Transparent timeline and cost: fixed price by spec or Time&Materials — whichever fits the task.
  • Post-release support: updates for new platform versions and SLA service if needed.

Timeline & pricing. Minor tweaks — from 1 week; mid-complexity module — 2–3 weeks; integrations/complex admin UI — from 4 weeks. Pricing — from $200 (micro-tasks) up to enterprise-level with complex integrations.

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