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.

Book a free consultation See our work

Fixed price, in writing1-day reply, from the developer90+ PageSpeed on every build30-day post-launch cover

Our Shopify app · Live on the App Store

Know what to reorder, before you run out.

StockCue brings demand forecasting, reorder alerts, purchase orders, receiving and stock counts into Shopify admin. Free plan for your first 50 SKUs, paid plans from $19/mo. Moving from Stocky? Your suppliers and open POs import in one step.

Install on Shopify See StockCue

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 services

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

Get a Shopify app quote

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

See theme work

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

Plan your migration

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

Start your build

Book a free consultation

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.

Book a free consultation See the full case studies

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

Meet the team

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. StockCue is live now; Echoly lands soon.

StockCue: Inventory Forecast Live

Demand forecasting, reorder alerts, purchase orders, receiving and stock counts, inside Shopify admin. Imports directly from Stocky.

Explore StockCue, our Shopify inventory app

Echoly 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 more

StockCue is live on the Shopify App Store: free for your first 50 SKUs. Echoly is coming soon. Install on Shopify →

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.