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I will build shopify custom app, webhook integration, saas web app, checkout extension
Brace Maty
About this gig
Looking to build a secure Shopify app, integrate complex APIs, or build a scalable SaaS tool? Look no further.
I am an expert Shopify App Developer specializing in building high-performance Public and Private apps using React/Remix, Node.js, GraphQL, and Polaris UI. Whether you need a backend script or a multi-tenant SaaS application, I engineer optimized, secure solutions.
What I Offer:
- Custom Apps: Tailor-made Private apps or Public apps for the App Store.
- API Integrations: Seamless data sync with CRMs, ERPs, or external databases.
- Webhooks Setup: High-volume webhook configuration with secure verification.
- SaaS Architecture: Multi-tenant design and Shopify Billing API integration.
- Advanced Features: Checkout/UI Extensions, Theme App Blocks, GDPR/Privacy Webhooks, and Multi-Market Support.
- Emergency Fixes: Debugging API deprecations, broken webhooks, or theme conflicts.
My Stack:
React, Remix, Polaris UI, Node.js, Express, Postgres, MongoDB, Shopify CLI, App Bridge.
I build to strict "Built for Shopify" standards.
IMPORTANT: Every app is unique. Please message me before ordering to discuss your scope!
Respect third-party rights
Please be aware that it is against Fiverr's policies for sellers to include themes, templates, or any other elements that infringe third-party rights or applicable laws in the delivered work. Read more about in our Guide to Responsible Digital Creation.
Get to know Brace Maty
Brace Maty
Automation Architect and Full Stack E commerce Developer
- FromUnited States
- Member sinceOct 2026
- Avg. response time1 hour
Languages
French, German, Spanish, Italian, English
Hi, I am a professional Shopify App Developer specializing in building high-performance Public and Private apps, custom SaaS platforms, and secure API integrations. I use Shopify’s modern tech stack—React, Remix, Node.js, and GraphQL—to engineer optimized solutions built strictly to "Built for Shopify" standards. Whether you need custom Checkout Extensions, Theme App Blocks, or urgent webhook fixes, I deliver clean, scalable code.
FAQ
Do you handle app hosting and domain setup?
No, hosting costs are your responsibility. I will deploy your application to platforms like AWS, Heroku, or Render and configure your database, but the server account subscriptions belong to you.
What is the difference between a Public and Private app?
Private apps are custom-made for a single store's internal operations. Public apps are multi-tenant SaaS products listed on the Shopify App Store for any merchant to install and buy.
Can you fix my app if it broke due to Shopify API updates?
Yes! Shopify updates its API quarterly. I will audit your codebase, replace deprecated GraphQL/REST endpoints, update webhooks, and ensure full compatibility with the latest version.
Do you design the user interface to look like Shopify?
Yes. I build embedded apps using Shopify Polaris, the official design system. This ensures your app’s dashboard looks and feels completely native right inside the Shopify Admin panel.
Will your app slow down a live Shopify storefront?
Never. I build storefront features using modern Theme App Extensions and App Blocks. This leaves core theme files untouched and guarantees zero impact on your site loading speeds.
Can you integrate Shopify with third-party CRM or ERP software?
Yes. I seamlessly connect Shopify to external systems like HubSpot, Salesforce, or custom software using secure API integrations and real-time webhook data synchronization.
Is my data secure when using your webhook setups?
Absolutely. I implement strict cryptographic validation using your Shopify App Client Secret. This blocks unauthorized requests and guarantees your server only processes valid data.
Will you handle the submission process for the App Store?
I guarantee the code meets "Built for Shopify" standards. Managing the actual store listing submission and handling reviewer feedback loops can be added as a premium gig extra.
How do I charge users if I want to turn my app into a SaaS?
I integrate the official Shopify Billing API. This lets you seamlessly bill merchants via monthly recurring subscriptions or usage-based fees directly through their Shopify invoices.
What backend tech stack do you use to build the apps?
I use the official, industry-standard Shopify stack: React and Remix for the frontend, combined with Node.js on the backend, and robust databases like PostgreSQL or MongoDB.
