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I will develop custom shopify public app private app custom app graphql API integration
mark
About this gig
Need a Shopify app that solves a real store problem, connects an external system, or can be sold to other merchants?
I develop Shopify public apps, custom apps and legacy private app solutions using Shopifys current GraphQL-first stack.
I can build:
- Shopify public app for App Store distribution
- Shopify custom/private app for one store or Plus organization
- GraphQL Admin API and Storefront API integrations
- Third-party API, ERP, CRM, inventory, fulfillment and order sync
- OAuth, webhooks, app billing and subscription logic
- Shopify Functions for discounts, delivery, payment and cart rules
- Checkout UI, Thank You and Order Status extensions
- Embedded admin dashboards with Polaris/App Bridge
- Product, customer, order, metafield and inventory automation
- REST-to-GraphQL migration, bug fixing and app upgrades
- App deployment, testing and App Store submission support
I focus on secure authentication, clean code, reliable webhooks and scalable architecture.
Message me before ordering with your workflow, required features and target stores.
Ill recommend the right public or custom app approach and send a realistic custom quote.
Thanks.
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Get to know mark
mark
what i love doing best
- FromNigeria
- Member sinceAug 2026
Languages
English
I’m a Shopify app developer specializing in public apps, custom/private apps, GraphQL API integrations, automation, and third-party system connections. I help Shopify merchants and SaaS founders build secure, scalable solutions using Shopify APIs, webhooks, OAuth, billing, Node.js, React, and modern app architecture. I can develop custom store apps, public App Store apps, ERP/CRM integrations, inventory and order automation, checkout extensions, Shopify Functions, and API-based workflows. My focus is clean development, reliable integrations, and solutions built around real business needs.
FAQ
What is the difference between a Shopify private app and custom app?
Shopify retired the official “private app” type. What many buyers call a Shopify private app is now normally built as a custom app for a specific merchant or organization.
Can you develop a Shopify public app for the App Store?
Yes. I can build the public app architecture, OAuth, GraphQL API, billing, webhooks, extensions, testing and submission preparation. Final approval is controlled by Shopify.
Do you develop new Shopify apps with REST or GraphQL?
New development is GraphQL-first using Shopify's current Admin API. I can also migrate existing Shopify REST API integrations to supported GraphQL workflows.
Can my Shopify custom app connect with an ERP, CRM or external API?
Yes. Shopify API integration can connect inventory, orders, products, customers or fulfillment workflows with ERP, CRM, 3PL, SaaS and custom backend systems.
Can you build Shopify checkout extensions and custom checkout logic?
Yes. Depending on your Shopify plan and use case, I can use Checkout UI Extensions, Shopify Functions, web pixels and supported checkout APIs.
Can you implement Shopify OAuth, app billing and subscriptions?
Yes. Public Shopify apps can include secure OAuth installation, access scopes, recurring billing logic, subscription plans and webhook lifecycle handling.
Can you repair an existing Shopify public or custom app?
Yes. I can diagnose GraphQL errors, failed webhooks, authentication issues, outdated APIs, billing problems, extension errors and third-party API integrations.
Can you build inventory, product and order synchronization?
Yes. I can create Shopify automation for product syncing, inventory updates, order routing, fulfillment, metafields, customers and external databases.
Can you develop Shopify Functions for advanced store logic?
Yes. Shopify Functions can support custom discounts, payment rules, delivery customization, cart validation, cart transformations and other supported logic.
How do you price a custom Shopify app project?
App cost depends on distribution type, integrations, screens, workflows, extensions, billing and backend requirements. Message me first and I can scope the project accurately.
