# Sonder (Sonder Sites Pty Ltd) > Melbourne, Australia agency run by Tim Sullivan. We build custom apps, rescue vibe-coded apps (built with Cursor, Lovable, Bolt or v0) and take them to production, and we build Shopify Plus stores and deep integrations (ERP, POS, 3PL, Klaviyo). Senior work only, no account managers. Contact: tim@sondersites.com ## The Living Website Sonder defines and builds the living website. A living website is one that fixes itself, watches its market, and gets better every week, instead of quietly rotting from the day it launches. A dead website is built once and left alone: still online but slowly decaying, leaking customers every day. Every change to a living website is reviewed and approved by a human on the Sonder team. - [What is a living website](https://www.sondersites.com/living-website): The definition, dead vs living, why websites die, how one is kept alive, and what it costs. - [Snowball](https://www.sondersites.com/snowball): Our living-website service. Monitoring, healing, research and a human-approved improvement every week. From $500 AUD a week, first week free. - [Dead or alive? Free scan](https://www.sondersites.com/dead-or-alive): Free diagnostic that tells you if your website is alive, fading or dead. ## Services - [Capabilities](https://www.sondersites.com/capabilities): The full agency stack in one place: Shopify Plus, custom apps, integrations, SaaS, university platforms, vibe-code rescue and migrations, plus how we work. - [Vibe code rescue](https://www.sondersites.com/services/vibe-code-rescue): We take apps built with Cursor, Lovable, Bolt or v0 from demo to production: security audit first, then auth, payments and real infrastructure - [Custom app development](https://www.sondersites.com/services/custom-apps): Web apps, SaaS products and internal tools, designed and engineered end to end - [Shopify Plus](https://www.sondersites.com/services/shopify-plus): Enterprise Shopify Plus builds, headless storefronts and replatforms - [Shopify development](https://www.sondersites.com/services/shopify): Store builds, theme engineering and store rescues on core Shopify - [Integrations](https://www.sondersites.com/services/integrations): ERP, POS, 3PL, NetSuite and Klaviyo integrations for commerce systems - [SaaS engineering](https://www.sondersites.com/services/saas): Product engineering for SaaS founders - [University platforms](https://www.sondersites.com/services/university-platforms): Membership, booking and payment platforms for universities ## Proof - [Client work](https://www.sondersites.com/work): Case studies including RMIT University, Applied EV, Purvis Beer, Razorback 4x4, 12 Boards and CASA - [RMIT University](https://www.sondersites.com/work/rmit): Unified membership and booking platform across campuses - [Applied EV](https://www.sondersites.com/work/applied-ev): Engineering-grade web presence for an autonomous vehicle company ## Locations - [Melbourne](https://www.sondersites.com/locations/melbourne): Home base. App development and Shopify Plus for Melbourne businesses - [Kyneton and Macedon Ranges](https://www.sondersites.com/locations/kyneton): Based between Melbourne and the Macedon Ranges, working across Australia - [Sydney](https://www.sondersites.com/locations/sydney) - [Brisbane](https://www.sondersites.com/locations/brisbane) - [New York](https://www.sondersites.com/locations/new-york) ## Contact - [Start a project](https://www.sondersites.com/contact): Scoped estimate in minutes, reply within one business day - Email: tim@sondersites.com ## Optional - [Insights](https://www.sondersites.com/insights): Technical guides on Shopify Plus, ERP integration and app development - [Agentic commerce and Shopify Plus](https://www.sondersites.com/insights/agentic-commerce-shopify): AI agents now shop for your customers. What that means for Shopify Plus in 2026: GEO, MCP, and being the store an agent actually picks. - [Shopify Plus ERP integration guide](https://www.sondersites.com/insights/shopify-plus-erp-integration-guide): Connecting Shopify Plus to NetSuite, Dynamics 365, SAP and Acumatica. Middleware vs point-to-point, rate limits, and where the source of truth lives. - [Shopify Plus B2B: unify DTC and wholesale](https://www.sondersites.com/insights/shopify-plus-b2b-wholesale-unification): How to run DTC and wholesale on one Shopify Plus store with native B2B, instead of two separate platforms bleeding margin. - [Shopify Checkout Extensibility migration playbook](https://www.sondersites.com/insights/shopify-checkout-extensibility-migration-guide): Shopify Scripts died June 2026. The enterprise playbook for migrating discounts, gift cards and custom logic to Checkout Extensibility. - [Why enterprise brands are leaving Magento and SFCC](https://www.sondersites.com/insights/shopify-plus-migration-magento-sfcc): The real timeline, cost and architecture when enterprise brands move from Magento or Salesforce Commerce Cloud to Shopify Plus. - [Security checklist: is my AI-built app secure?](https://www.sondersites.com/insights/vibe-code-security-checklist): 18 security checks for Bolt, Lovable, Cursor and v0 founders before they go live. The issues AI builders introduce by default, and the ones that cause data breaches. - [SFCC to Shopify Plus migration playbook](https://www.sondersites.com/insights/sfcc-to-shopify-plus-migration): The dedicated enterprise playbook for migrating from Salesforce Commerce Cloud to Shopify Plus. SFRA architecture traps, price book mapping, and real cost comparisons. - [Shopify Functions for enterprise pricing](https://www.sondersites.com/insights/shopify-functions-enterprise-pricing-guide): Shopify Scripts died June 2026. The enterprise guide to rebuilding tiered discounts, customer-group pricing, and payment restrictions in Shopify Functions. - [Shopify Plus multi-brand portfolio](https://www.sondersites.com/insights/shopify-plus-multi-brand-multi-entity): Running multiple brands on separate platforms costs more than consolidation. The enterprise guide to Multi-Entity Selling, expansion stores, and portfolio architecture on Shopify Plus. - [Guide: vibe-code rescue cost guide](https://www.sondersites.com/blog/vibe-code-rescue-cost): Honest 2026 pricing for rescuing apps built with Lovable, Cursor, Bolt and v0. Three cost tiers, what drives the price up, audit-first scoping, and the questions to ask before hiring anyone. - [Guide: my Lovable app is broken, the actual fix](https://www.sondersites.com/blog/fix-broken-lovable-app) - [Guide: my Bolt app is broken, the actual fix](https://www.sondersites.com/blog/fix-broken-bolt-app) - [Guide: my Cursor app is broken, the actual fix](https://www.sondersites.com/blog/fix-broken-cursor-app) - [Guide: my v0 app is broken, the actual fix](https://www.sondersites.com/blog/fix-broken-v0-app) - [Guide: my Replit app is broken, the actual fix](https://www.sondersites.com/blog/fix-broken-replit-app) - [Guide: my Windsurf app is broken, the actual fix](https://www.sondersites.com/blog/fix-broken-windsurf-app) - [Guide: custom app development](https://www.sondersites.com/blog/custom-app-development-guide) - [Guide: Shopify Plus vs Advanced Shopify](https://www.sondersites.com/blog/shopify-plus-vs-advanced): Honest comparison of the two plans: real pricing, checkout extensibility, B2B, API limits, and the six signals it is time to upgrade. We build on both, so no upsell. - [Guide: WooCommerce to Shopify migration](https://www.sondersites.com/migrations/woocommerce-to-shopify): What a WooCommerce to Shopify migration involves, when to move, data migration, plugin replacement, SEO redirects and a zero-downtime cutover. - [Guide: Magento to Shopify Plus migration](https://www.sondersites.com/migrations/magento-to-shopify): Enterprise Magento 1 and 2 replatforming to Shopify Plus, licence renewal timing, complex data architecture and zero-downtime cutover. - [Guide: BigCommerce to Shopify migration](https://www.sondersites.com/migrations/bigcommerce-to-shopify): SEO-first BigCommerce to Shopify migrations: complete one-to-one 301 mapping, full content and blog migration, Search Console monitoring through launch, from $15,000 AUD.