Custom Shopify App Development for Australian Brands
For AU merchants who have outgrown off-the-shelf apps. We build private and public Shopify apps, merchant tools, storefront features and admin extensions, on Shopify's native framework, so they run fast, stay secure and remain yours to keep.
When the app store stops being enough
Most stores start with off-the-shelf apps. At some point they stop fitting the way you actually operate.
App fees keep stacking up
You are paying five monthly subscriptions and each app does a fraction of what you need.
No app does your logic
Your workflow is specific to your business, and no listing on the App Store matches it.
Apps fight each other
Conflicting scripts and injected code slow the storefront and break on theme updates.
Work lives in spreadsheets
A manual process that should live inside Shopify admin is being run by hand every day.
Data is trapped
Orders, inventory or customer data cannot move cleanly between Shopify and your other systems.
You want to publish an app
You have a product idea for the Shopify App Store but no in-house engineering to build it.
Scope at a glance
Where we draw the line, so there are no surprises at handover.
| Nexly delivers | Your side | Out of scope | |
|---|---|---|---|
| App design & build | Full UX, Polaris UI and code | Brand assets and staff access | Native theme redesign |
| Integrations | API and webhook wiring end to end | Third-party credentials and accounts | Building the third-party system itself |
| Hosting & deploy | Setup on your infra or ours | Cloud account if self-hosted | 24/7 managed hosting unless retained |
| App Store listing | Submission-ready build and review support | Store copy and screenshot sign-off | Ongoing app marketing and growth |
Is a custom app the right call?
A good fit if
- You are paying for several apps that each do part of the job
- Your ops team runs a manual process worth automating inside admin
- You need a storefront feature no theme app offers
- You want to publish a public app to the Shopify App Store
- You need Shopify data synced cleanly with an ERP, 3PL or CRM
Probably not for you
- An existing app already does it well, we will tell you if so
- The job is a one-off rule better handled by Shopify Functions or Flow
- You are on a platform other than Shopify, we are Shopify-only
- You want the cheapest possible freelancer patch, not a maintainable build
What Shopify app development covers
Private apps for a single store, or public apps built to Shopify's standards for the App Store.
What we build
- Private and custom apps for a single store
- Embedded admin apps and merchant tools
- Theme app extensions and storefront app blocks
- Admin UI extensions
- Public apps built for the Shopify App Store
- Background jobs, webhooks and sync services
Technical deliverables
- OAuth install flow and session token auth
- GraphQL Admin API integration
- Webhook subscriptions with retries and verification
- Billing API for public apps
- GDPR and mandatory compliance webhooks
- CI/CD, structured logging and error monitoring
Technology & integrations
- Remix, Node and TypeScript
- Polaris and App Bridge
- Hydrogen and storefront surfaces where relevant
- Hosting on your infrastructure or ours
- ERP, 3PL, CRM and payment integrations
- Shopify Functions and Flow where they fit better
How we build it
Staged and demo-driven, so you see working software early and often.
Discovery & scoping
Week 1. We map the workflow, confirm build versus buy, and define the app surfaces.
Technical design
Week 1–2. Data model, API surface, auth and hosting decided before a line of feature code.
Build
Weeks 2–6. Iterative development on Remix and Polaris with staged demos each sprint.
Integration & QA
Weeks 5–8. End-to-end testing, edge cases, rate limits and webhook reliability under load.
Review & submission
For public apps, we prepare the listing and shepherd it through Shopify's app review.
Launch & handover
Week 6–10. Install to production, monitor, then hand over code, docs and an optional support retainer.
Quality controls before launch
Every app clears the same checklist, private or public.
- OAuth and session token flows tested end to end
- Webhook delivery, verification and retries confirmed
- API rate-limit handling proven under load
- GDPR and mandatory compliance webhooks implemented
- WCAG 2.1 AA on all merchant-facing UI
- Error monitoring and logging live before go-live
Investment
Realistic AUD bands, typical for this work and scoped properly after discovery.
Focused private app
Single workflow, one or two integrations, embedded in admin.
Complex custom app
Multiple surfaces, deeper integrations and background sync.
Public App Store app
Submission-ready, Billing API, compliance and review support.
Shopify app development FAQs
Related services
Tell us the workflow you are trying to fix
Book a 30-minute call. We will tell you honestly whether a custom app is the right call, or whether an existing app or a Shopify Function would do the job for less.
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