Clear scope and pricing
Fixed projects or monthly retainers, priced upfront
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Shopify, AI & Product Development
EXTFOX is a development partner for Shopify Plus, SaaS, and AI-driven commerce brands.
SR Bank, custom platform
- SR Bank, custom platform
Our Services
Themes, apps, checkout extensions
Shopify development
Custom Shopify Plus stores, theme development, subscription systems, and checkout customization for high-growth brands.
Chatbots, voice agents, workflows
AI & automation
AI-powered customer support, RAG search systems, voice agents, and workflow automation that reduce costs and scale operations.
MVPs, SaaS platforms, full-stack apps
Product development
From 4 to 8 week MVP sprints to enterprise SaaS platforms. Next.js, React, Node.js, Angular, AWS architecture built to scale.
Themes, apps, checkout extensions
Shopify development
Custom Shopify Plus stores, theme development, subscription systems, and checkout customization for high-growth brands.
Chatbots, voice agents, workflows
AI & automation
AI-powered customer support, RAG search systems, voice agents, and workflow automation that reduce costs and scale operations.
MVPs, SaaS platforms, full-stack apps
Product development
From 4 to 8 week MVP sprints to enterprise SaaS platforms. Next.js, React, Node.js, Angular, AWS architecture built to scale.
Themes, apps, checkout extensions
Shopify development
Custom Shopify Plus stores, theme development, subscription systems, and checkout customization for high-growth brands.
We can help you with
01
Shopify developmentCustom 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 BUILD
Senior engineers. Modern stack.
Shopify, Next.js, AWS, OpenAI, and the tools your product needs. One team from architecture to launch.
Shopify
Next.js
Node.js
GraphQL
Angular
n8n
OpenAI
AWS
Python
React
TypeScript
PostgreSQL
Docker
Tailwind
Kubernetes
GitHub
Figma
MongoDB
Firebase
VercelFull-cycle delivery
Architecture, build, and optimization without handoffs between teams.
Commerce and AI
Shopify Plus, automation, and AI systems built for production, not demos.
HOW WE WORK
Ship in weeks, stay for years
Scoped projects when you need them.
Retainers when you want a team on call.
Retainers when you want a team on call.
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
From the founder
A message from
our founder.
EXTFOX · Founder letter · Est. 2016
On partnership
“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.
What our customers say
“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%.
Power your growth where it matters most
For founders and product teams who need to ship faster.
Real outcomes from real projects.
Commerce that converts
Shopify Plus stores, checkout, and subscriptions built to grow revenue. Trusted by CleanSkinClub, Smilepen, and The Honest Kitchen.
AI that ships
Support agents and automation running in production, not slide decks.
Products built to scale
MVPs in 4 to 8 weeks and SaaS platforms with architecture that lasts.
Trusted by the brands you know
Your long-term partner.
10+ years building commerce, SaaS, and AI products. Our clients stay because we deliver, not because they're locked into contracts.
83% still active after 24 months
Measured across retainer and repeat project clients since 2019. No minimum term or lock-in.
Projects and retainers
Fixed-scope projects when you need a clear deliverable. Monthly retainers when you want a dedicated team on call.
The record
Proof, not promises.
Shipped products, conversion lift, and delivery speed from live client work.
01
80+
Products developed
Proven results in Shopify and SaaS development
View our work02
15–40%
AI that converts
Intelligent automation engineered to lift revenue
03
4–8weeks
Product development
MVPs shipped on schedule. SaaS platforms built for long-term growth
Let's meet
Dusan J. Founder @ EXTFOX.com | Custom Shopify Plus development, AI commerce systems, and product MVPs for DTC brands
Tell us about your project
Pick a time that works for you. You'll get instant confirmation and a calendar invite.
Prefer to call? (862) 259-6969
Not ready to book?
Frequently Asked Questions
All three are production systems for commerce companies, built by the same senior team. Shopify Plus storefronts, checkout extensions, and subscription systems. RAG systems and AI agents running in production. Next.js and Node SaaS platforms. Most clients hire us for one and find the second later. If you want a studio that only does Shopify themes, there are good ones and we'll say so.
Fixed-scope projects are quoted after a discovery call. Retainers are monthly. MVPs run 4 to 8 weeks. You get a number and a timeline before anything starts, and if your budget doesn't cover what you're describing, we say that instead of quietly scoping down.
Usually one to two weeks. A discovery call and a scoped proposal take a few days. If we're full, we tell you that instead of taking the deposit and starting late.
Six senior engineers. You work with the people who build it, not an account manager, and the same people who scope the project deliver it.
Yes. Code ships to your repository, documented, with a handover walkthrough for whoever maintains it. No vendor lock-in, no minimum term, no charge for access. 83% of our clients are still with us after 24 months, and none of that is because leaving is hard.
Fine either way. We often take one workstream alongside an internal team, or scope around what your current agency isn't covering. No requirement to switch anyone out.