Shopify Partner Agency10+ Years Commerce Engineering

Engineering Custom Shopify Apps, Checkout Extensions & Scalable Commerce

We partner with scaling merchants, Shopify Plus brands, and digital agencies to engineer high-performance public and private Shopify apps, checkout UI extensions, sub-second themes, and custom automation.

Explore Project Scope →View Shopify Apps

Core Focus:Custom Shopify AppsShopify Plus CheckoutShopify FunctionsCustom ThemesAI Workflows

apsentic-commerce-engine

Shopify API 2026-01 · Active

KorAddress · Korean postcode search

Runs on:Cart & cart drawer·Theme app extension

Try a market:

Search Korean Postcode / Road Address (우편번호 검색):Click to fill sample

Daum/Kakao

Prefilled Shopify Checkout Fields

Postal Code / ZIP06236

State / Province서울특별시 (Seoul)

Address Line 1 (Road / Street)강남구 테헤란로 152 (강남파이낸스센터)

Detail Line (Apartment / Suite)14층 (Floor 14)

Address data stays in the shopper's browserAbout KorAddress →

Native Cart Transform & Discount Function

Runtime:WebAssembly (Wasm)·< 5ms

Active Tiered Rule: Buy 3+ items save 15% · Buy 5+ items save 25% + Free Express Shipping.

Aerodynamic Hybrid Wiper Blade Set

$38.00 each · Kimblade Engineered

Subtotal$114.00

Function Discount-15% ($17.10)

Final Checkout Total$96.90

// Generated GraphQL Function Payload

{
  "discountApplication": {
    "target": "cart_lines",
    "percentage": 15,
    "message": "Tier 1 Volume Incentive (-15%)"
  }
}

100+

Stores & Integrations Scaled

Global merchants across US, EU, KR & APAC

5.0 ★

Shopify App Store Rating

KorAddress, from 1 merchant review

99.9%

Production API & App Uptime

Monitored with Sentry, Horizon & LogRocket

< 250ms

Extension Render Latency

Sandboxed checkout web workers

Estimate

Estimate your project.

Pick what you need to see a typical timeline, the stack we'd use and what's included. You get a fixed quote after a short call.

1. What do you need?

2. Your Shopify plan

3. How you'd like to work

Your estimateFixed quote

You picked

Custom Shopify App

Typical timeline2 – 3 weeks

PlatformShopify Plus

Typical stack:

Remix · Node.js · Shopify Admin GraphQL · Webhooks · PostgreSQL / Prisma · Docker

What's included:

✓Written scope and technical plan before any code
✓A staging store for you to test on
✓Error monitoring with Sentry
✓30 days of post-launch support

Discuss this estimate →

You get a fixed quote before work begins.

Products

Apps we build and run ourselves.

Shopify apps for address entry and delivery checks, used by merchants every day.

View all products

Live on App StoreKorean Shopify merchants$9.99/month · 7-day free trial

KorAddress

Let Korean shoppers find their address in two taps and autofill checkout.

✦Official Daum/Kakao postcode search on your cart page and cart drawer
✦Autofills Shopify checkout: postcode, road address, detail, city, phone
✦Show it to Korean visitors only, or to everyone, with locale targeting

Learn more

Demo store ↗App Store ↗

Coming soonIndian and COD-heavy markets

ZIP/Pincode Delivery Validator

Tell customers whether you deliver — and whether COD is available — before they reach checkout.

✦Product page delivery-check widget
✦Checkout UI Extension validation
✦Built for COD-heavy markets

Learn more

Coming soonIndonesian Shopify merchants

Indonesia Address Autofill

Simplify Indonesian address entry and improve checkout usability for Shopify merchants.

Learn more

Coming soonMexican Shopify merchants

Mexico Address Autofill

Address autocomplete designed around the needs of Mexican Shopify stores.

Learn more

PlannedTurkish Shopify merchants

Turkey Address Autofill

A future address autocomplete solution focused on improving address entry for Turkish Shopify customers.

Learn more

PlannedSouth African Shopify merchants

South Africa Address Autofill

A future address autocomplete solution focused on improving address entry for South African Shopify customers.

Learn more

Services

Storefront to server, under one roof.

Stores, apps, backends, integrations and tracking, all from one team.

Explore all services

Shopify App Development

Public and custom Shopify apps built on Remix, Theme App Extensions, Checkout UI Extensions, Web Pixels and Shopify Functions, for the features no App Store listing quite covers.

Learn more →Enquire

Shopify Store Development

New stores and theme rebuilds on Shopify and Shopify Plus, designed around your products, coded for speed and editable by your team.

Learn more →Enquire

Checkout & Shopify Plus

Extend the most important page in your store with Checkout UI Extensions, Shopify Functions and customer account extensions.

Learn more →Enquire

Custom Backend & Web Applications

Laravel and Node.js backends, REST APIs, admin panels, queues and webhook processing that scale with your business.

Learn more →Enquire

Integrations & Automation

Connect your store, marketing, CRM and operations into automated workflows that run reliably, with queues, retries and audit trails.

Learn more →Enquire

ERP Integrations & Ongoing Care

Connect Shopify to the rest of your business, then keep everything running smoothly with a monthly retainer.

Learn more →Enquire

CRM & Subscription Systems

Connect checkouts and funnels to direct-response CRMs for orders, subscriptions, rebills and fulfillment.

Learn more →Enquire

Telehealth Platforms

Patient intake, clinician review and prescription flows for telehealth brands, built on established clinical networks.

Learn more →Enquire

Why Apsentic

Engineered for Scale. Built Without Bloat.

Most Shopify stores suffer from conflicting apps, slow checkout scripts, and unmaintained code. We build clean, platform-native architecture that stays fast.

Product-Grade Engineering

We build public Shopify apps and private merchant tools with modular architectures, automated test suites, and dedicated staging sandboxes.

Shopify Plus & Checkout Extensions

Native Checkout UI Extensions and Shopify Functions that replace deprecated checkout scripts without slowing down conversion.

Zero-Bloat Performance

Storefront themes engineered for 95+ Google PageSpeed and sub-200ms TTFB, eliminating unneeded JavaScript dependencies.

Automation & AI Workflows

Custom n8n and Python integrations that sync ERPs, warehouse feeds, and inventory across multi-region storefronts automatically.

Full-Stack Backend Reliability

Production backends built on Node.js, Laravel, PostgreSQL, and Docker on VPS or Hetzner, avoiding exorbitant enterprise cloud overhead.

End-to-End Compliance & Security

Strict adherence to GDPR, Korea PIPA, and Shopify App Store compliance, keeping merchant and customer data strictly isolated.

Case studies

Selected work.

Real problems we solved for merchants, and the stack we used.

View all case studies

US automotive parts retailer

Diagnosing and fixing an intermittently failing vehicle finder

Challenge:

A make/model/year wiper-blade finder was failing for paid-ad visitors with no reproducible pattern. The hosting provider pointed back at the application.

Outcome:

Root cause proven with evidence rather than guesswork; client approved the migration plan.

ReactLaravelMySQLShopify webhooks

Read case study

International pharmacy retailer (two Shopify stores)

Cross-border order and payment bridge between two stores

Challenge:

Orders placed on one regional store had to be fulfilled and paid through a second store in another country, with affiliate commissions tracked across both domains.

Outcome:

Affiliate commission tracking validated end-to-end with confirmed test orders.

Laravel 11PostgreSQLHorizonFilament

Read case study

Korean consumer brand

A multilingual Shopify store built for Korean customers

Challenge:

The store needed to read naturally in Korean and English and handle Korean address entry.

ShopifyLiquidCSS custom propertiesDaum/Kakao Postcode

Read case study

How we work

Four steps, no surprises.

A written scope before any code, and progress you can review every week.

Understand

We learn your business, systems and goals, then send a clear written scope.

Build

We develop in staging, with progress you can review every week.

Launch

We test, deploy and monitor, with a rollback plan ready.

Support

We maintain, improve and scale what we've built together.

Clients

Trusted by teams around the world.

Active production systems across US, South Korea, UAE, and Europe

Tim Jenifer

South Korea

Shopify KR Localization

Danny

United States

Vehicle Finder Engine

UAE

Custom Shopify Apps

Jao

Germany

Theme & CRO Architecture

Robert

United States

Cross-Store Payment Bridge

Industries we serve

E-commerce & DTC

Telehealth

Subscription & direct response

Automotive retail

Health & wellness

Technology

What we build with.

The platforms, frameworks and services we work with every day.

Shopify
Shopify Plus
Liquid
Headless Commerce
Theme App Extensions
Checkout UI Extensions
Shopify Functions
Web Pixels
Admin GraphQL API
Storefront API
Cafe24
React
Vue
Remix
JavaScript
TypeScript
HTML & CSS
Laravel
PHP
Node.js
Python
FastAPI
Flask
REST APIs
Prisma
Horizon
Filament
PostgreSQL
MySQL
ChromaDB
Qdrant
AWS
S3
Docker
Kubernetes
VPS

Hetzner
Oracle Cloud
Coolify
Railway
LogRocket
Sentry
n8n
Make
Zapier
XVerify
Smarty
Vouched
Vonage
SendGrid
Postman
Konnektive CRM
Vrio CRM
Sticky.io
Telegra
MDIntegrations
OpenAI
Claude
Gemini
LangChain
CrewAI
AutoGen
GA4
GTM
Google Ads
Meta Pixel
Conversions API
TikTok Pixel
CustomerLabs
Everflow
Tracknow
Crazy Egg

FAQ

Questions, answered.

Technology that solves real business problems.

Apsentic Technologies works where commerce meets engineering. Our teams in South Korea and India design, build and maintain the systems behind online stores, subscription funnels and telehealth platforms, from the storefront to the database.

About us →·Book a discovery call →

Discovery & Scoping

Have a system to build or fix?

Tell us what you're working on, and we'll reply within one business day.

Book a discovery call →Explore Products

Direct engineer consultation·Fixed scope·Call +91 86385 22394