Custom Shopify Apps and Workflows for Merchants With Complex Operations
Checkout Rules, Admin Tooling, B2B Workflows, and Integrations That Replace Manual Work and Make Shopify Fit the Way Your Business Actually Runs.
Testimonial videos
Commerce teams trust us with the systems their revenue runs through checkout logic, ERP syncs, and the workflows in between.
Let's Discuss
Jo Levy
United Kingdom | OYNB
Roger Compton
United Kingdom | Trim
Jo Levy
United Kingdom | OYNB
Roger Compton
United Kingdom | Trim
Trusted by commerce teams running complex operations
From custom checkout logic to ERP integrations and B2B workflows, we help Shopify merchants replace manual processes with systems that scale.
See Our WorkShopify Systems Built
Custom Apps Shipped
Merchants Served
Testimonial videos
Commerce teams trust us with the systems their revenue runs through — checkout logic, ERP syncs, and the workflows in between.
Let's Discuss
Jo Levy
United Kingdom | OYNB
Roger Compton
United Kingdom | Trim
Jo Levy
United Kingdom | OYNB
Roger Compton
United Kingdom | Trim
How We Work
We work closely with your team from start to finish, sharing aligned goals and maintaining full transparency throughout the process.
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01/05
Discovery & Diagnosis
We map your current Shopify setup, app stack, integrations, and operational workflows. We identify where manual work, fragility, or friction lives.
02/05
Architecture
We design the system: data flows, app structure, API connections, and checkout logic. You get a clear plan before any code is written.
03/05
Build
Development runs in focused sprints with weekly demos. Every component is built to Shopify’s standards and tested against real order scenarios.
04/05
Testing & Validation
We test across environments, edge cases, and load conditions. Payment flows, webhook reliability, and data integrity are verified before launch.
05/05
Launch & Stabilization
We deploy, monitor, and support the system through its first real-world cycles. Post-launch refinements are part of the process, not an afterthought.
Discovery & Diagnosis
We map your current Shopify setup, app stack, integrations, and operational workflows. We identify where manual work, fragility, or friction lives.
Architecture
We design the system: data flows, app structure, API connections, and checkout logic. You get a clear plan before any code is written.
Build
Development runs in focused sprints with weekly demos. Every component is built to Shopify’s standards and tested against real order scenarios.
Testing & Validation
We test across environments, edge cases, and load conditions. Payment flows, webhook reliability, and data integrity are verified before launch.
Launch & Stabilization
We deploy, monitor, and support the system through its first real-world cycles. Post-launch refinements are part of the process, not an afterthought.
Start With a Defined First Step
A diagnostic review of your operational pain points, app stack, workflows, and system dependencies. We map what’s working, what’s breaking, and what to fix first. Best for merchants who know something is wrong but aren’t sure where to start.
Book a Systems AuditWe assess whether your desired checkout behavior is technically possible on Shopify Plus, what it requires, and whether it’s worth the custom investment. Best for merchants hitting checkout limitations.
Assess My CheckoutA short paid engagement that produces a system architecture map, implementation roadmap, and phased build plan. Best for merchants ready to move from diagnosis to build.
Start an Architecture SprintSystems We’ve Built
A few builds we’ve worked on with clear goals, sharp delivery, and results that speak for themselves.
Let's Discuss
Trim
Subscription logic, payment orchestration, and retention workflows. Boosted retention by 35% and conversions by 40%.
Bentham Science
Workflow modernization and content platform integration. 40% more engagement, 35% fewer manual tasks.
Why Custom Over Off-the-Shelf
When apps and themes stop being enough
Off-the-shelf Shopify apps solve 80% of problems well. But the remaining 20% the operational logic, the edge cases, the workflows unique to your business is where revenue leaks and manual overhead live. Custom systems close that gap. We build them.
Built for merchants who have outgrown off-the-shelf
Your Shopify store works. But your operations don’t fit neatly into themes and apps anymore. You’re managing workarounds across checkout, fulfillment, pricing, or B2B ordering and the cracks are showing. That’s where we come in.
Tell Us About Your Workflow
What We Build
Checkout & Functions
Custom payment, shipping, discount, and validation logic for Shopify Plus merchants who need checkout to match their business rules.
Admin Apps & Ops Tooling
Internal tools that replace spreadsheets, manual approvals, and exception handling with purpose-built Shopify admin apps.
Integrations (ERP / WMS / CRM / 3PL)
Reliable connections between Shopify and your warehouse, finance, logistics, and customer systems. Built to handle real order volume.
B2B & Wholesale Workflows
Custom catalogs, account-specific pricing, approval chains, rep-assisted ordering, and invoicing for merchants selling to other businesses.
Customer Accounts & Post-Purchase
Self-service portals, returns management, order modifications, and account tooling that reduce support load and improve retention.
App Consolidation & Replacement
Replace fragile app stacks with lean, custom-built solutions. Fewer dependencies, better performance, lower monthly costs.
What We Build
Checkout & Functions
Custom payment, shipping, discount, and validation logic for Shopify Plus merchants who need checkout to match their business rules.
Admin Apps & Ops Tooling
Internal tools that replace spreadsheets, manual approvals, and exception handling with purpose-built Shopify admin apps.
Integrations (ERP / WMS / CRM / 3PL)
Reliable connections between Shopify and your warehouse, finance, logistics, and customer systems. Built to handle real order volume.
B2B & Wholesale Workflows
Custom catalogs, account-specific pricing, approval chains, rep-assisted ordering, and invoicing for merchants selling to other businesses.
Customer Accounts & Post-Purchase
Self-service portals, returns management, order modifications, and account tooling that reduce support load and improve retention.
App Consolidation & Replacement
Replace fragile app stacks with lean, custom-built solutions. Fewer dependencies, better performance, lower monthly costs.
Performant designed and built a refreshed website home page for us in Wordpress and did an excellent job. They were helpful and respectful but clearly knowledgeable in their field, offering expert advice and recommendations at each stage. From the outset, with very tight timelines, they proposed a clear schedule which they then stuck to, even though it ran over the holiday period. It was lovely to see design and development skills wrapped up so efficiently; they gave us three design approaches in Figma and then moved on to execute the Wordpress build seamlessly.
One of our most valuable agency partnerships, wouldn't have been possible to scale at speed without them.
Very knowledgeable team. Easy to work with. Understood clearly the requirements after asking detailed questions. Extremely happy with the result, particularly the fact that they took it off my plate and I could trust them to execute (even without knowing them, but based on the way the PM talked about the project).
They were brilliant, highly recommend. Really easy to deal with and knew their stuff. 10
The team at Performantcode worked tirelessly to deliver the project, even with last-minute curve balls from us. The final product looks great, and we are going to continue using them for future projects. Communication was great, the work was completed quickly, and the support during go-live was much appreciated.
Performant delivered excellent work on this FE development project and I enjoyed working with them. Communication was top-notch, met all deadlines, and skills were very strong. I enjoyed working with them and will likely have additional jobs for them in the future. Very few agencies have the ability to untangle complex requirements with ease and finesse. Highly Recommend!
Not sure where to start?
Tell us what’s not working in your Shopify setup. We’ll tell you whether it’s a quick fix or a systems problem and what the right first step looks like.
Book a Shopify Systems Audit
What teams say after working with us