Shopify App Development
Most stores start with marketplace apps, then hit a workflow none of them handle: a pricing rule, a warehouse split, a sync with the ERP. That's when a custom app is worth it. We build private apps for a single store, public apps for the Shopify App Store, Checkout UI Extensions and Shopify Functions for Plus merchants, and POS extensions for shops that also sell in person. Webhooks go through a queue with retries, because Shopify will occasionally send the same event twice or not at all.
Sound Familiar?
The problems that usually bring people to us for shopify app development.
- You're paying for five marketplace apps that together almost do what you need.
- Your checkout customisations stopped working after Shopify retired Scripts and checkout.liquid.
- Staff copy orders or stock into another system by hand every day.
- Stock levels drift between Shopify and your warehouse or ERP.
- You have an idea for a public app but haven't built one for the App Store before.
- Your agency has more Shopify app work than its developers can handle.
Shopify Apps We Build
Private Shopify Apps
Store-specific apps for automation, inventory sync, operations dashboards, custom pricing, fulfillment, and internal workflows.
Public Shopify Apps
Multi-tenant Shopify apps with OAuth, billing, onboarding, app review preparation, and scalable merchant account management.
Checkout Extensions
Checkout UI Extensions, Functions, validation logic, custom fields, upsells, delivery rules, payment rules, and Shopify Plus workflows.
Shopify POS Integrations
POS extensions and retail workflows that connect in-store operations with online inventory, loyalty, customers, and fulfillment.
Headless Shopify
Hydrogen, Remix, or Next.js storefronts connected to Shopify APIs for fast, custom, conversion-focused shopping experiences.
Operational Integrations
ERP, CRM, warehouse, 3PL, accounting, shipping and tax integrations, with sync logic that handles retries and partial failures.
Services include
- Private Shopify App Development
- Public Shopify App Store App Development
- Embedded Admin Apps with Remix
- Checkout UI Extensions
- Shopify Functions for Discounts, Delivery, and Payments
- Shopify POS Customizations
- Metafields, Metaobjects, and Custom Data Models
- Subscription & Membership Apps
- ERP, CRM, WMS, and 3PL Integrations
- Bulk Operations for Catalog and Order Sync
- Headless Storefronts with Hydrogen or Next.js
- App Billing, OAuth, Webhooks, and Review Support
Why work with us
Built Around Merchant Workflows
Before writing code we sit with the people who'll use the app (ops, warehouse, support) and build around what they actually do each day.
Checkout-Safe Customization
Checkout UI Extensions and Shopify Functions are the supported way to change checkout now that checkout.liquid and Scripts are gone. We use them, not workarounds.
Reliable Webhook Architecture
Order, product, stock and refund webhooks are queued, retried and de-duplicated, and every failure is logged so it can be replayed.
Ready for Scale
The GraphQL Admin API, Bulk Operations for big catalogue jobs, and background workers, so the app stays within Shopify's rate limits on busy days.
App Store and Billing Support
For public apps we handle OAuth, the Billing API, GDPR webhooks and the App Store review checklist, which is where many first submissions get rejected.
Long-Term Ownership
The code is yours on final payment. You get documentation and a deployment handover, and support after that is optional.
Technologies
Custom App Engineering
Shopify apps built with clean architecture, reliable APIs, and production deployment practices.
- OAuth install flow, embedded admin UI, and app billing
- Webhook handling with retries and idempotency
- GraphQL Admin API, REST API, and Bulk Operations
- Multi-tenant architecture for public Shopify apps
Checkout & Storefront
Conversion-focused Shopify customization within modern Shopify platform rules.
- Checkout UI Extensions and Shopify Functions
- Custom discounts, delivery, payment, and validation logic
- Theme app extensions and Liquid customization
- Hydrogen, Remix, and Next.js headless storefronts
Commerce Operations
Apps and integrations that remove manual work from growing Shopify teams.
- ERP, CRM, WMS, 3PL, and accounting integrations
- Inventory, order, refund, and customer sync workflows
- Subscription, loyalty, wholesale, and membership logic
- Monitoring, alerting, audit logs, and admin reporting
Related Case Studies
Projects where we did shopify app development work.
AI Customer Support Automation for Online Retailers
- Problem
- The support team couldn't keep up with a high volume of repetitive questions, so responses slowed during peak sales periods.
- What we did
- AI support for online retailers: the main build is a support assistant with order lookups, CRM integration and live-agent hand-off, plus two related Shopify builds.
Shopify Plus B2B Wholesale: D2C to Wholesale Platform
- Problem
- Wholesale ran on email and spreadsheets: every order needed the sales team, and pricing errors were common.
- What we did
- Wholesale expansion on Shopify Plus for a D2C brand: company accounts, tiered wholesale pricing, net terms, bulk ordering, and ERP-connected inventory.
Shopify Plus Apps: Order Routing, Checkout and Subscriptions
- Problem
- Native apps couldn't route orders by warehouse zone, customise checkout, or run subscriptions without extra per-order fees.
- What we did
- Three builds for three Shopify Plus merchants: a private order-routing app with ERP sync, checkout UI extensions, and a native subscribe-and-save flow.
How the Work Runs
- 01
Discovery
We map merchant workflows, Shopify plan constraints, API scopes, app users, conversion goals, and integration requirements.
- 02
Architecture
We define app structure, OAuth, billing, webhooks, database schema, queues, API contracts, and deployment strategy.
- 03
Development
We build in focused sprints with demos, code review, staging deployments, and clear acceptance criteria.
- 04
Testing
We validate install flow, permissions, webhooks, checkout logic, API limits, failure states, and store compatibility.
- 05
Launch
We support private app deployment or public app review preparation, documentation, monitoring, and rollback planning.
- 06
Growth
We continue with feature iterations, performance tuning, platform updates, and support retainers as your app grows.
Working Together
Pick the arrangement that fits. You can change it as the work changes.
Startups
Need an experienced Shopify team without building a large in-house engineering group.
Growing D2C Brands
Have an existing Shopify store and need additional capacity for apps, checkout work, or integrations.
Agencies
Need a reliable Shopify technical partner for client app or storefront projects, including white-label work.
Subscription & Membership Brands
Need custom subscription, loyalty, or membership logic that off-the-shelf apps don't cover.
Private App Build
A focused fixed-scope app for one Shopify store or Shopify Plus organization with clear workflows and launch criteria.
Public App Build
A multi-tenant app build with onboarding, billing, app review preparation, documentation, and merchant support flows.
Checkout Extension Sprint
A focused sprint to replace legacy checkout logic with Checkout UI Extensions and Shopify Functions.
Support Retainer
Monthly or quarterly support for app updates, bug fixes, API changes, feature iterations, and performance monitoring.
Learn more →Not Ready to Commit to a Full Team?
Instead of hiring a full team immediately, start with:
- A specific app feature
- A checkout extension
- An API integration
- Bug fixes
- A small development project
Then evaluate:
- Code quality
- Communication
- Delivery
- Technical understanding
If the relationship works, expand into ongoing development. No pressure to commit further than the first project.
More on contracts, IP and pricing: How we work · Pricing
Shopify App Development FAQ
Common questions about shopify app development.
Do you build both private and public Shopify apps?
Yes. Private apps for a single store or Shopify Plus organisation, and public apps with OAuth, billing, onboarding and Shopify App Store review preparation.
Can you build Shopify checkout extensions?
Yes. We build Checkout UI Extensions and Shopify Functions for custom fields, validation, discounts, delivery and payment rules, and upsells.
Can you connect Shopify to our ERP, CRM or warehouse?
Yes. We use webhooks, the GraphQL Admin API and Bulk Operations, with queues and retries so a failed call doesn't leave an order half-synced.
Can we start with a small project?
Yes. Start with one app feature, checkout extension or integration and see how we handle code quality, communication and delivery before committing to anything bigger.
Do we own the code?
Yes. On final payment the source code and IP are transferred to you, with repository access, deployment notes and documentation. There are no licence fees to us.
Related Reading
Shopify Bulk Operation Queries: How We Solved a Major Client Data Sync Issue
A practical Shopify engineering case note on using bulkOperationRunQuery and bulk operations to fix slow, unreliable large-catalog data syncs.
Read article →Shopify's Checkout Auto-Migration Just Hit: Damage Control and What's Next
August 26, 2026 was the hard deadline for non-Plus Shopify stores to move off checkout.liquid and Additional Scripts. If you didn't migrate in time, here's what broke, how to recover, and the next deadline already on the calendar.
Read article →A Genuinely Useful Shopify Checkout Extension: The Order Bump
Why a single, well-timed order bump inside Shopify's native checkout beats cart-page upsell pop-ups — and how to build one on Checkout Extensibility.
Read article →Other e-commerce services
Need an App That Does Exactly What Your Store Needs?
Describe the workflow you want to automate or the checkout change you need. We'll reply within one business day with questions and a rough estimate.
Ready to Start Building?
Tell us what you're working on. We reply to every enquiry within one business day (Mon–Sat, IST) with questions, a rough timeline and a quote. No obligation.
Not ready for a full build? Start with a free call or a small, paid discovery phase. see how we keep it low-risk.
General Enquiries
info@keviontechnologies.in
Support
support@keviontechnologies.in
Call Us
+91 75730 55757
Our Promise
A senior team member reads every enquiry and replies personally within one business day. In the UK, UAE or US? Tell us your time zone and we'll book a call that suits you.