App stacks audited and integrated deliberately, not stacked.
Senior Shopify app integration for stores running 15–40 apps. We audit the stack, integrate the keepers properly, replace the heavy ones with custom code where the math works, and document everything so the next agency doesn't have to start over.
Audit
Integrate
Replace
Document
What is Shopify app integrations?
Shopify app integrations are custom data and event integrations between Shopify and your stack — ERPs, PIMs, analytics, marketing automation, fulfillment systems. The work either rationalizes an over-installed app stack into theme code or builds the custom integrations apps cannot.
Why this exists
Shopify app stacks compound silently.
Each app is added for a reason. Over years, the stack grows to 30+ apps with overlapping functionality, undocumented dependencies, and front-end performance costs nobody is tracking. We audit the stack against ROI and performance cost, integrate the keepers properly, replace the heavy ones where it makes sense, and document the result.
What we hear most
When a Shopify app integration engagement is overdue.
App stack has bloated past 20
Each app is on a separate billing cycle. Total spend has crept past your CAC line. ROI per app is unclear.
Apps overlap functionally
Two review apps, two upsell apps, three analytics tools. Each was added for a different team. None has been deprecated.
Apps are hurting performance
Tracking pixels, front-end JS, sitewide CSS — apps are the largest performance cost on your store.
App integration is fragile
Klaviyo events fire inconsistently. Yotpo reviews don't always show. Recharge subscriptions lose data on changes. Integration depth is shallow.
Migration to a new app is overdue
You want to swap a vendor. Migration plan is unclear. Customer data, history, and integrations all need handling.
What we deliver
What ships in a Haxtiv Shopify app engagement.
An app audit, deep integrations for the keepers, and a documented stack the next team can inherit.
Audit
- Inventory: every installed app with cost, function, owner
- Performance cost per app (front-end JS, render impact)
- ROI per app where data allows
- Overlap and replacement-candidate analysis
- Recommendation: keep / replace / drop / consolidate
Integration
- Klaviyo: events, flows, segmentation, transactional emails
- Yotpo / Stamped: review schema, UGC, on-site placement
- Recharge / Bold: subscription logic, dunning, customer portal
- Tapcart / mobile apps: storefront sync, push notifications
- Custom apps: built where math works (over $X/mo or perf cost)
Migration
- App-to-app migration plans (Yotpo → Okendo, Recharge → Bold, etc.)
- Customer data and history migration
- Email / SMS deliverability transition
- Dual-running where required for reconciliation
- Cutover and monitoring plan
Documentation
- Stack inventory with named owners
- Integration touchpoints documented in repo
- Runbook for app-related incidents
- Quarterly stack review cadence
- Vendor evaluation framework for future additions
Process
How this service runs end to end
The same six-step shape we use across every Haxtiv project — adapted to the specifics of this scope.
01
Discover
Audit, intent, and the part nobody is saying out loud
We open with a working session — not a deck. We pull analytics, crawl the existing site, audit the brand, and interview the people closest to revenue. We surface the friction inside the team, not just the friction on the screen.
02
Define
Sitemap, story, and the metrics that actually matter
We define the audience journeys, the commercial pages we are willing to defend, the SEO architecture, and the measurable outcomes. You get a shape of the project that survives feedback because it was built on evidence.
03
Design
Editorial system, art-directed, never templated
Type, grid, motion, and tone built as a system. We design the hero, the long pages, the unloved corners, and the empty states. Every screen looks like it belongs to the same studio. Nothing is parked for later.
04
Build
Production code your team can keep
WordPress, Shopify, or page builder — we build clean, accessible, performant, and documented. Component-led, naming you'll recognize next year, and a changelog your in-house team can read.
05
Launch
Migration without losing rankings or sleep
Pre-launch crawl, redirect map, schema and metadata cutover, performance baseline, and a launch playbook. We run the deploy with you, not at you.
06
Grow
Care plan, CRO sprints, and quiet improvements
We stay involved. Monthly performance reports, security and core updates, and CRO sprints that compound. The site gets better the longer you keep us.
What this looks like in production
Numbers we earn, not numbers we round up.
Sites shipped
across 27 countries
Studio hours
delivered since 2019
Avg conversion lift
post-redesign clients
Client retention
into year two
In their words
Senior teams who chose us.
Haxtiv replatformed our marketing site without losing a single ranking. We saw organic leads up 38% inside the first quarter and the editorial team finally has a layout system they don't fight.
Mara Iglesias
VP Marketing · Lumenwave Health
Headless WordPress redesign
Our previous Shopify build was a Frankenstein of apps. The Haxtiv team simplified the stack, rebuilt the PDP and CRO patterns, and our store is faster and more profitable than it has ever been.
Daniel Korver
Founder · Northbound Goods
Shopify Plus rebuild
Frequently asked
Answers worth asking for.
Don't see the question you're holding? Send it to [email protected] and we'll answer the same day.
Continue reading
Where to go next
Start here
Brief us on the app stack — we'll audit and tell you what to do.
30-minute call. We'll review the stack and share a fixed quote.