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Build custom Shopify Functions that work around your business

A successful Shopify Functions implementation requires more than custom logic. We combine commerce strategy, technical planning, and rigorous testing to build reliable functionality around your Shopify Plus requirements.

“Our sales have increased significantly, 50% increase in conversions after getting services from the Bigfolio hit the ground running.”

Hear from Jordan

Trusted by ambitious Shopify Plus brands

Our Shopify custom
Functions Process

A successful Shopify Functions project starts with the rules behind your store. We plan the logic, build it into Shopify Plus, connect the systems you already use, and test every scenario before launch.

Discovery, Requirements & Planning

We begin by understanding your business rules, existing Shopify setup, and functional requirements. This creates a clear foundation for your custom Shopify Functions roadmap.

  • Requirements Gathering: Define business rules, customer needs, discount logic, checkout requirements, and functional goals.

  • Technical Architecture: Plan Functions logic, data flows, Shopify APIs, integrations, and the required development approach.

  • Solution Planning: Align custom functionality with your storefront, operations, customer journey, and long-term growth.

Function Development & Configuration

We translate approved requirements into reliable Shopify Functions designed around your specific commerce workflows and operational needs.

  • Custom Functions Development: Build tailored Shopify Functions for discounts, validation, cart logic, delivery, and other requirements.

  • Shopify Plus Integration: Connect custom functionality with Shopify Plus capabilities and existing store infrastructure.

  • Commerce Logic Engineering: Develop scalable logic with performance and maintainability in mind across key shopping workflows.

Integrations & Advanced Functionality

Custom functionality works best when every part of your commerce ecosystem works together. We connect Functions with the systems your business depends on.

  • Discount & Cart Functions: Build advanced pricing, discount, cart, and product logic around your business rules.

  • Third-Party Integrations: Connect Shopify Functions with ERP, CRM, subscription, fulfillment, and other systems where required.

  • Custom Functionality: Extend standard Shopify capabilities with tailored experiences designed around complex commerce needs.

QA, Launch & Continuous Optimization

Before launch, we rigorously test your Shopify Functions across supported scenarios and storefront experiences. After launch, we monitor performance and refine functionality as needed.

  • Quality Assurance: Test business logic, edge cases, customer scenarios, integrations, and checkout-related functionality.

  • Launch & Deployment: Coordinate deployment, final validation, monitoring, and post-launch checks across the store.

  • Ongoing Optimization: Monitor functionality, identify improvements, resolve issues, and refine the Shopify experience.

Is this the right fit ?

Our Shopify Functions service isn't for everyone. Here's who it's built for.

This is for you if

  • Your Shopify store needs functionality beyond standard settings
  • You have complex discount or pricing requirements
  • You need custom shipping or payment logic
  • Your e-commerce workflows require specific business rules
  • You want scalable custom Shopify development

This isn't for you if

  • You only need basic Shopify configuration
  • Your requirements can be handled with existing Shopify features
  • You are looking for a simple theme customization
  • You need a quick workaround without long-term planning
  • You do not have a defined functional requirement

The right implementation starts with the right requirements.

Our Partner StoriesThat Inspire Bigfolio

We partner with ambitious Shopify Plus brands that want to build better. From custom Shopify Development to complex commerce experiences, we meet brands where they are and help them move forward with confidence.

Bigfolio has been an outstanding technology partner for Fandiem. They led our migration to Hydrogen and built the custom platform behind our charity campaigns, auctions, fundraising operations, and complex commerce workflows.

What sets Bigfolio apart is their ability to understand complex business requirements and turn them into fast, scalable, well-engineered solutions. Their technical expertise, problem-solving, communication, and attention to detail have been exceptional throughout our partnership.

I highly recommend Bigfolio to any company looking for a trusted Shopify Plus and custom commerce partner.

+28%

Campaign Participation

+42%

Donation Revenue

90+

Auction Engagement

90+

Platform Performance
Ross Gassman

Ross Gassman

Co-Founder, Fandiem Inc.
Fandiem Shopify Plus storefront built by Bigfolio
Bigfolio meeting room with yellow chairs and wall logo

We're a full service
shopify plus agency

Bigfolio partners with growth-focused ecommerce brands to design, build, and scale high-performing Shopify Plus storefronts. From Shopify Plus development to Hydrogen headless commerce, we bring the technical depth needed to move complex projects forward.

Tight deadlines, evolving priorities, complex requirements. We have handled them all. Our approach combines Shopify CRO, thoughtful UX design, and technical expertise with no-nonsense project management to keep every build focused, efficient, and built to perform.

We are not a build-and-disappear agency. Once your storefront is live, our team stays on for ongoing optimization, new feature rollouts, and the kind of long-term support that keeps performance improving quarter after quarter, year after year.

750+

Designed Shopify storefronts

250M+

Revenue generated in 2025

5 Star

Registered in Shopify Partner Directory

Frequently
Asked Questions ?

Answers to common questions about custom Shopify Functions, implementation, and building flexible commerce logic around your business requirements.

Explore More
shopify plus services

We partner with ambitious Shopify Plus brands that need custom commerce logic. From Shopify Functions to custom apps and integrations, we build solutions designed around how businesses actually operate.

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Partner with Bigfolio for scalable Shopify Plus development, Hydrogen commerce, CRO, and long-term growth support.