Every high-volume Shopify Plus store eventually hits a ceiling with off-the-shelf apps. We design and build private Shopify apps, custom API integrations, and backend systems that fit your business exactly. Our team works with the Shopify Admin API, Storefront API, Shopify Functions, and Checkout Extensibility to extend your store's capabilities without compromising platform stability. Common engagements include ERP and 3PL integrations, custom pricing and discount logic, and bespoke loyalty systems all built to Shopify's API versioning standards and designed for long-term maintainability.
There are 13,000 apps in the Shopify App Store. None of them do the thing your business actually needs or one of them does it badly, expensively, and with a UI your team hates.
Seedcms builds custom apps for merchants who've outgrown off-the-shelf, and for partners shipping commerce products into the Shopify ecosystem. Embedded admin tools, public App Store launches, private partner integrations.
Built on Remix, Gadget, or whatever the stack demands. Polaris-native UI. OAuth, GDPR, and security review handled.
What a Custom App Development engagement covers the scope, the deliverables, and the operational reality of shipping each piece.
Public-listed apps for partners shipping commerce products to the Shopify ecosystem. End-to-end: development, submission, security review, launch.
Bespoke apps installed on your store and yours alone. The functionality the App Store doesn't have, built to your spec, owned by you.
Internal tools that live inside Shopify Admin merchandising dashboards, ops consoles, custom reporting, bulk operations.
How we run a Custom App Development engagement. Sequenced so each phase de-risks the next.
Use cases, scope, App Store vs private, distribution model, integration surface. Output is a spec lean enough to ship and complete enough to ship safely.
Stack decisions Remix vs Gadget vs custom, hosting, data model, webhook strategy, scaling profile. Designed for the load you'll actually hit.
Senior engineering on a small team. Polaris-native UI from day one. CI, monitoring, error tracking wired in before the first feature ships.
For public apps: App Store submission, security review, listing assets, screenshots, install flow. We've taken apps through review we know what they'll catch.
Public launch with merchant onboarding flow, support docs, billing wired up. Or private install with admin training and runbook.
Shopify APIs evolve. We stay on for ongoing maintenance API version upgrades, security patches, feature shipping usually as a monthly retainer.
Tools and partners we deploy on Custom App Development engagements. Certified, integrated, and chosen on purpose.
The questions we get about Custom App Development before brands sign. If yours isn't here, ask us directly.
Public when you're a partner shipping a commerce product to the broader Shopify ecosystem you want listing, distribution, recurring billing, and the App Store as a sales channel.
Private when you're a merchant who needs functionality the App Store doesn't have, installed on your store and yours alone. No listing, no review queue, full control over the codebase.
Submission to live is usually 2–6 weeks depending on the review queue and how clean the submission is. We've shipped apps through review enough times to know what they'll catch OAuth scoping, GDPR webhooks, billing flow, dispute handling.
We build to those requirements from day one so resubmissions are rare.
You. Full stop. Code lives in your GitHub, infrastructure on your accounts, all IP transferred at launch. We've never built a vendor-locked client app and we never will.
Stack-agnostic. We default to Remix for most builds (Shopify's official recommendation, great DX, scales well), Gadget when speed-to-market matters more than custom infra, and bespoke Node/Python stacks when the requirements demand it.
We'll make the recommendation in week one based on your scale, team, and roadmap.
Most clients move to a monthly retainer with us post-launch Shopify APIs ship breaking changes, security patches need shipping, features keep coming. If you have in-house engineering we transfer cleanly with documentation and a knowledge-transfer week.
Yes. Custom apps are often the bridge between Shopify and the rest of your stack ERPs, OMSs, warehouse systems, BI warehouses, internal admin tools. Webhook architecture, queue design, error recovery all in scope.
30-minute intro call. No deck, no sales theater just senior people, your roadmap, and an honest answer on whether we're the right fit.
Book an intro call