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Automate your store with custom Shopify apps
Build the feature Shopify doesn't have: subscriptions, B2B portals, ERP integrations and internal workflows — then own the IP.
- Launch in 4–8 weeks
- Fixed scope & price
- App Store ready
Shopify · WordPress · Custom software — senior developers
We build stores that turn browsing into buying.
Founder-led development for growing brands — Shopify, WordPress, and custom web & mobile apps. Fixed price, senior-only, no hand-offs: the developer on your first call is the one who ships your build.
Our Shopify app · Launching soon
Stocky is shutting down August 31. Reorderly is the replacement.
Reorder alerts, purchase orders, receiving, stock counts — plus demand forecasting. Free plan, $19/mo founding price before Sept 30, 2026.
What We Do
Shopify, WordPress & custom software — built to convert.
From revenue-focused Shopify themes and apps to zero-downtime migrations and custom SaaS — we scope, build and launch so you can focus on growth.
Explore all services02
Custom Shopify themes that sell faster
Hand-coded Online Store 2.0 themes designed around checkout behaviour — fast, mobile-first and editable by your team.
- 90+ PageSpeed target
- Mobile-first UX
- Sections your team can edit
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Migrate or launch without losing traffic
Move from WooCommerce, Wix, Magento or start from zero — products, customers, URLs and SEO rankings preserved.
- Zero-downtime migration
- 301 redirects handled
- SEO rankings preserved
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Build your SaaS, app or AI product
Full-stack MVPs, mobile apps, API architecture and AI integrations — from scoping to launch, with one senior team.
- MVP to v1 roadmap
- API & AI integration
- Cross-platform mobile apps
Recent results
The numbers show up on the invoice, not the pitch deck.
A few outcomes from recent Shopify & WordPress engagements. Details anonymized under client NDA — live references available on a call.
+112%
Organic clicks after a Shopify SEO rebuild
1,400+
Products migrated from WooCommerce, zero data loss
3,120/3,120
URLs redirected on migration — no broken links
90+
PageSpeed target hit on every store we launch
Every project ships with the reports behind these numbers — no black boxes.
Why Devmerx
Six promises. All measurable.
No vague agency talk — these are the things every Devmerx project is judged against.
Revenue per visitor, up
UX + speed + CRO working together. We track meaningful lift with you.
PageSpeed 90+ target
Slow pages cost sales. We target 90+ on every build and track it.
Staging before production
No untested builds shipped to your live store. Ever.
Same developer, start to finish
No handoffs, no re-explaining context mid-project.
One price, in writing
Scope locks before a line of code is written. No surprise invoices.
Your team edits without code
CMS-native components so your team updates content in Shopify's editor.
About Devmerx
You talk to the developer building your product.
Devmerx is a founder-led studio. No account managers, no juniors learning on your budget, no handoffs — the senior developer on your first call scopes, builds, and ships your project. We scope in writing, work in weekly sprints, and stay after launch.
- Same senior developer from first call to launch
- Fixed price, locked scope, no surprise invoices
- 30 days free support after every launch
How It Works
From first call to launch, without the chaos.
i.
Free consultation
A 20-minute call about your project, your problem and whether we're the right fit. No pitch deck.
ii.
Fixed scope & quote
Within 48 hours: a written scope, a fixed price and a realistic timeline. You approve before anything starts.
iii.
Launch & 30-day cover
We handle the go-live, monitor everything, and fix anything that comes up — free for 30 days.
We build our own products, too
Two Shopify apps, built for real merchant pain.
We don't just build for clients — we ship our own Shopify apps. Both launching soon.
Reorderly Launching soon
Stocky is shutting down. Reorderly replaces it: reorder alerts, purchase orders, receiving, and stock counts — plus demand forecasting on the Growth plan.
Founding price: $19/mo, locked in forever if you install before Sept 30, 2026.
Explore Reorderly, our Shopify inventory appAI Share of Voice Soon
Track your brand's visibility in ChatGPT, Gemini, and Perplexity. Weekly benchmarking, citation logs, and a product fix list that tells you exactly what to improve.
Learn moreReorderly & AI Share of Voice — our Shopify apps — are launching soon. Join the waitlist →
Common Questions
Before you ask.
How much does it cost to build a Shopify app?
Most custom apps we build land between $3k and $15k depending on complexity. After the free call you get a fixed quote in writing — the number never moves without your sign-off.
How long does a custom Shopify theme take?
Typically 3–6 weeks from kickoff to launch, including two feedback rounds. You'll see a working staging link at the end of every week.
Can you migrate my store to Shopify without losing SEO?
Yes. We map every URL, set up 301 redirects, preserve metadata and structured data, and monitor Search Console for 30 days after the switch.
Do you work with WordPress and WooCommerce too?
Yes — custom WordPress sites, WooCommerce stores, and moves in either direction. We'll recommend the platform that actually fits your business.
What happens after launch?
Every project includes 30 days of free support. After launch, most clients move to a monthly retainer or come back per-project. No lock-in either way.
How do we communicate during a project?
Email plus a weekly check-in call, and you always have the developer's direct line. We reply within one business day, often same-day.
Still have questions? Email us directly
Find out what your store could do better.
A free 20-minute review call: we look at your theme, apps and speed, then send you our honest notes — whatever you decide to do next. Fixed price, in writing, if you move forward.
No pressure, no follow-up sequence — just one reply from a developer.