One senior engineer. One Slack channel.
You'll work directly with the engineer building your store — not a project manager relaying messages to a junior team. They review code, ship code, and answer your questions in the same channel.
Conversion-focused Shopify development
Turn every visitor
Turn every visitor
into customers.
Download DevCart's apps to increase your Shopify website revenue. Hire DevCart's expert Shopify developers — fixed scope, fixed price, on time.
Senior engineers · Fixed price · No surprises
Add to Cart
Featured app Private beta
StoreBoost
Conversion optimization for Shopify — A/B tests, urgency, social proof, and exit recovery. One app, one script, edge-served.
Tests
A/B · holdout
Modules
Urgency · proof
Stack
Pixels · Workers
Featured app Private beta
ShipCast
Shipping rules that go beyond zone and weight — by product, tag, and customer segment. Built on the edge for stores that have outgrown the native rate table.
Rules
Zone · weight · tag
Carriers
UPS · FedEx · DHL
Stack
Plus · Workers
Audit · 30 min Free
Hire a senior
Shopify engineer.
A senior engineer reviews your theme, app stack, and checkout — and gives you a written punch list. Even if we never work together.
Scope
Fixed, signed off
Price
Fixed, no hourly
Team
Senior-only
The senior Shopify studio built for optimization
Two ways DevCart moves your numbers.
Stores don't underperform because of design — they underperform because of speed, friction, and missing levers. We rebuild the parts that drive revenue.
Build for speed
Themes engineered for Core Web Vitals.
OS 2.0 themes built around Lighthouse, INP, and LCP from day one — not bolted on after launch. Section-everything, merchant-friendly, and stripped of the JS bloat that taxes every page view.
See Theme Development → Build for conversion
Checkout and apps that lift AOV.
Checkout Extensibility, Functions, and custom apps built to move the levers Shopify lets you move — upsells, bundles, gates, shipping rules, and B2B flows that turn more visitors into multi-product buyers.
See Our Apps →Built on the modern Shopify stack
Shopify Plus ● Hydrogen ● Checkout Extensibility ● Functions ● Web Pixels ● Liquid ● GraphQL Admin ● Cloudflare Workers ● Shopify Plus ● Hydrogen ● Checkout Extensibility ● Functions ● Web Pixels ● Liquid ● GraphQL Admin ● Cloudflare Workers ●
Why merchants choose DevCart
Six outcomes you can hold us to.
01
Higher AOV
CRO sprints, bundle builds, and post-purchase flows that move revenue per visitor — measured against the levers that actually matter.
02
Faster pages
Themes built around a target Lighthouse score you sign off on before launch. Every block, app, and pixel performance-budgeted.
03
Smoother checkout
Checkout Extensibility migrations, custom Functions, and UI extensions that ship before Shopify's checkout.liquid sunset.
04
Reliable apps
Production-grade Shopify apps with audit logs, retry-safe webhooks, and edge-deployed performance on Cloudflare Workers.
05
One senior contact
You talk directly to the senior engineer building your store — not a project manager relaying messages to a junior team.
06
Fixed scope, fixed price
Every engagement is spec'd and priced before code is written. No hourly billing, no surprise invoices, no scope creep.
How we work
Four steps. One senior.
Zero surprises.
01
Discover
A working session to map your goals, stack, and constraints. No discovery deck.
02
Spec
A written technical spec and a fixed price. You sign off before any code is written.
03
Build
Weekly Loom demos. Production-ready code, reviewed by a second senior on the team.
04
Launch & care
White-glove launch and 30 days of bug-fix support — included, not invoiced.
What you'll get
What working with us actually looks like.
Weekly Loom demos. No status meetings.
Every Friday you'll get a five-minute video showing exactly what shipped that week, with the staging URL and a punch list for the next sprint. Watch it on your time — we'll be in the channel for questions.
How long does a project take? +
Themes: 4–8 weeks. Apps: 6–12 weeks. Headless: 8–14 weeks. CRO is monthly. We give you a real timeline during discovery, not an optimistic one — and we hit it.
Do you only work with Shopify Plus? +
No. We work with both Shopify and Shopify Plus. Plus unlocks features we lean on (Functions, Checkout Extensibility, B2B), but plenty of our work runs on Advanced or Shopify.
Who actually writes the code? +
A senior Shopify engineer on the DevCart team. Every line is either written or reviewed by a second senior before it merges. No junior bait-and-switch — the person you meet on the kickoff call is the person shipping your code.
Do you offer support after launch? +
Yes. Every engagement includes 30 days of bug-fix support included in the price. After that, you can move to a monthly retainer or pay-as-you-go — your call.
Can you take over a project from another agency? +
Often, yes. We do an honest code audit first and tell you whether it's cheaper to continue or to rebuild. Either way you get a written assessment you can keep.
How do you handle scope changes? +
Scope changes are real — we just price them in writing. You see the cost and timeline impact before we touch the code. No surprise line items at the end of the month.
What's the next step if I want to work with you? +
Book a free 30-minute audit. A senior engineer reviews your store, app stack, and checkout, and you leave with a written punch list — whether or not we end up working together.
Now booking · Q3
Get a free 30-minute
Get a free 30-minute
Shopify audit.
A senior engineer reviews your store, app stack, and checkout. You leave with a written punch list — even if we never work together.
Book Your Free Audit
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