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Shopify App Development
EXTFOX is a global technology partner for Shopify Plus, SaaS, and AI-driven commerce brands.
Our Services
MVPs, SaaS platforms, full-stack apps
Product development
From 8-week MVP sprints to enterprise SaaS platforms. Next.js, React, Node.js, Angular, AWS architecture built to scale.
Chatbots, voice agents, workflows
AI & automation
AI-powered customer support, RAG search systems, voice agents, and workflow automation that reduce costs and scale operations.
Themes, apps, checkout extensions
Shopify development
Custom Shopify Plus stores, theme development, subscription systems, and checkout customization for high-growth brands.
MVPs, SaaS platforms, full-stack apps
Product development
From 8-week MVP sprints to enterprise SaaS platforms. Next.js, React, Node.js, Angular, AWS architecture built to scale.
Chatbots, voice agents, workflows
AI & automation
AI-powered customer support, RAG search systems, voice agents, and workflow automation that reduce costs and scale operations.
Themes, apps, checkout extensions
Shopify development
Custom Shopify Plus stores, theme development, subscription systems, and checkout customization for high-growth brands.
MVPs, SaaS platforms, full-stack apps
Product development
From 8-week MVP sprints to enterprise SaaS platforms. Next.js, React, Node.js, Angular, AWS architecture built to scale.
Build faster. Scale smarter. Control costs.
Your new technical team
We become your dedicated product team, from initial build to enterprise scale. Our senior engineers work alongside you to architect, build, and optimize the systems that power your growth.
Shopify
Next.js
Node.js
GraphQL
Angular
n8n
OpenAI
AWS
Python
React
TypeScript
PostgreSQL
Docker
Tailwind
Kubernetes
GitHub
Figma
MongoDB
Firebase
VercelFull-cycle product development
We handle everything from initial architecture to ongoing optimization. No handoffs, no silos - just one team focused on your success.
AI built into your core product
We don't just add AI features; we design products where intelligence is fundamental to the user experience and business value.
We can help you with
01
Shopify commerceCustom stores, themes, checkout extensions, and subscription systems for Shopify Plus brands.
02
AI & automationAI chatbots, voice agents, RAG search systems, and workflow automation that scale operations.
03
Product developmentMVP sprints, SaaS platforms, and full-stack applications with Next.js, React, and Node.js.
HOW WE WORK
MVP development in weeks, not months
We move fast without cutting corners.
Bringing your MVP or SaaS product to life with unmatched speed and quality.
Bringing your MVP or SaaS product to life with unmatched speed and quality.
Daily demos
You see progress every day, not just at the end
On-time delivery
We've shipped 80+ projects on schedule
Support included
30-day post-launch support, retainer options for ongoing work
We build what
actually sells.
Our portfolio isn't about pretty pictures. It's a collection of technical solutions that handle scale, complexity, and real-world business logic.
A Message From Our Founder
"Strong partnerships are built on dependability. I understand how frustrating it is when freelance partners jump to the next project and leave clients behind. We don't do that. We stay committed and right there with you when it matters most."
-Dusan J.
Founder & CEO, EXTFOX
What our customers say
One custom app built by EXTFOX replaced five. It manages our discount tiers, runs 40% faster, and saved us $12K a year. We felt the difference!
We're the #1 face towel on Amazon, but our Shopify offers were too slow and confusing. They rebuilt for speed, fixed our subscription flow, and our online revenue is now growing 18%.
They did more than deliver on time. Their proactive leadership and technical skill in delivering a really complex design from Figma ensured we launched our premium brand in weeks.
Next-level communication and skill. They found our site was too confusing, simplified it, added trust, and fixed our conversion rate in a month. We are not burning money on ads anymore.
We needed an MVP to prove our model in 3 weeks, not a year. EXTFOX integrated our legacy portal with new payment systems and built the dashboard from scratch. They worked directly with my dev lead, and we launched in weeks.
Power your growth where it matters most
For founders, product teams, and marketing leaders who need to move faster.
From high-growth storefronts to AI-native SaaS products, we specialize in the technology that drives revenue: faster launches, scalable architecture, and intelligent features that convert.
Shopify development that scales with your success
We build commerce engines, not just storefronts. From high-converting Shopify Plus migrations to complex subscription systems, we focus on architecture that converts and scales-proven with brands like Smilepen and The Honest Kitchen.
AI that actually works in production
We move AI from demo to daily operation. Implement RAG search that understands customer intent, AI agents that handle 40% of support queries, and automation that eliminates manual work. Real intelligence, measurable ROI.
AI MVP development built to scale
We’re your technical co-founders for ambitious software. From 8-week MVP sprints to enterprise SaaS platforms, we combine lean methodology with robust architecture. Launch, validate, and scale without technical debt.
Frequently Asked Questions
We specialize in three core areas: building custom SaaS platforms from MVP to enterprise scale, developing intelligent AI systems including RAG pipelines and autonomous agents, and creating high-conversion Shopify Plus solutions with advanced customization.
We're painfully honest about what works. Most agencies say yes to everything. We say "prove it" to bad ideas. We'll challenge your assumptions because your success matters more than our comfort. While other teams hide behind Jira tickets, we're thinking about your customers' experience. We lose sleep over micro-interactions. We fight for simpler solutions that actually get used. We care more than we should, and it shows in everything we build.
We partner with global DTC brands, enterprise companies, and funded startups. Our clients include Clean Skin Club, SmilePen, The Honest Kitchen, SR Bank and emerging SaaS companies across healthcare, ecommerce, and technology sectors.
Clients typically achieve faster product launch cycles, improved conversion rates through AI-powered optimization, significant automation of manual processes, and scalable systems designed for long-term growth with minimal technical debt.
Share your project goals through our link. We'll review your needs and schedule a discovery call to understand your requirements. Based on that, we'll provide a detailed technical plan, timeline, and investment estimate before project kickoff.
Trusted by the brands you know
Your next Shopify partner.
We've been doing this for 10+ years. Our clients stay because we deliver, not because they're locked into contracts.
Average client relationship: 2.3 years
Our clients don't leave because we keep delivering value. Most projects lead to ongoing partnerships.
Enterprise-grade stack
Next.js, AWS, Shopify Plus, OpenAI, n8n. We use tools that scale to millions of users.
80+ products developed
Proven results in Shopify and SaaS development
*Average 28% revenue lift for clients
AI that converts
Implementing intelligent automation that lifts revenue by 15-40%
MVP development
Architecting SaaS platforms for rapid launch and long-term growth
Let's speak
AvailableDusan J., Founder & CEO
Schedule a meeting with me
I'd love to hear about your project. Whether you're building a new product, scaling your Shopify store, or exploring AI automation, let's discuss how we can help.
Fill out the form and I'll get back to you within 24 hours to schedule a call.