Practice 04

Custom Apps & Integrations

ERP, OMS, CRM, PIM, loyalty and middleware that holds up.

KLOC builds custom Shopify apps, web apps, and mobile apps on a scalable tech stack, for commerce and non-commerce businesses. Public or private, with or without AI. We handle design, build, deployment, testing, and maintenance, and we publish our own apps on the Shopify App Store, so the capability is proven, not promised.

Our approach

How we work.

Built for the workflow

Scalable stack

MERN, Python, React Native and Flutter on infra that holds up under real load — not a stitched-together prototype.

AI where it earns it

Recommendations, copilots and agentic workflows wired in where they move a number — not for the headline.

Maintained, not abandoned

Weekly progress meetings, acceptance testing and SLAs for response and prioritisation. The relationship continues after launch.

The full practice, one engineering team.

Shopify apps

Public and private apps that extend your store: bulk tooling, loyalty, discounts, inventory, fulfilment, and checkout extensions.

Web applications

SaaS platforms, dashboards, portals, and internal tools on a MERN and Python stack. Real-time, secure, built to scale.

Mobile apps

Native and cross-platform iOS and Android with React Native and Flutter, integrated with your back office.

AI features

Chatbots, recommendation engines, and agentic workflows, wired in where they move a real metric, not for the headline.

Integrations & APIs

ERP, OMS, PIM, CRM, payments, and logistics. Custom APIs that connect the systems that should have been talking.

Deploy, test, maintain

The work does not end at launch. QA, cloud deployment, monitoring, and maintenance contracts with real SLAs.

Checkout extensibility

Custom checkout logic within Shopify guardrails for complex commerce.

Data & automation

Feeds, syncs and automation that keep every system speaking the same language.

The outcome

What you walk away with.

From a private Shopify app for one store to a public app for thousands. From an internal tool to a customer-facing platform — built, shipped and maintained.

Integration contracts & specs
Monitored, logged data flows
App source & documentation
Runbook & handover

specialised offerings in this practice · 19 years · 5,000+ stores · 5 continents

4.9 ★

608 Shopify reviews

App Store

published apps

Web + mobile

19 yrs

building software

End-to-end

build to maintenance

The deep dive

When off-the-shelf runs out

The feature you need doesn't exist yet. So we build it. Every growing business eventually hits the wall of what apps and plugins can do. A workflow no tool supports, an integration nobody offers, data trapped where your team cannot reach it. That is where a custom app pays for itself.

Logistics, digitised

We built a custom Shopify app connecting stores with OCS logistics software, so orders, shipping, and tracking flow without manual handoffs.

Systems that finally talk

Two middleware apps connecting Shopify stores with omnichannel loyalty software, keeping points and rewards in sync across channels.

Tools for one job

Small to mid-sized custom apps built for specific client use cases, in India and abroad, where no off-the-shelf tool fit.

Deep integrations

ERP, OMS, PIM, CRM, payments, and logistics wired into Shopify through custom apps and middleware that hold up under real load.

Our process

How we work

From problem to live app, in four moves. A documented process run by senior engineers, with weekly progress you can see and a plan before any code ships.

Scope

We map the problem, the users, and the integrations, then agree costs and a delivery plan before the build.

Build

Delivered in sprints, with new software to view throughout and weekly progress meetings, so you watch it grow.

Test & launch

Full acceptance testing, then we go live together, with support through the transition so it lands smoothly.

Maintain

The relationship continues with maintenance contracts and SLAs for response time and issue prioritisation.

Weekly progress meetings, software you can see grow
Acceptance testing before anything goes live
Maintenance SLAs for response and prioritisation
Senior engineers, never subcontracted

On the App Store

On the Shopify App Store

We don’t just build apps for clients. We publish our own. Live, installable proof that we know how to ship and support real products at scale.

Live · discounts

Marketwise Discount Ninja

Flexible, market-aware discounting for Shopify. Run the right promotion for the right customer, without the manual setup.

Live · loyalty

Marketwise Loyalty Ninja

A complete loyalty solution for Shopify. Points, rewards, and retention mechanics that turn one-time buyers into regulars.

Live · AI visibility

LLMEO · Visibility across LLMs

Track and grow your brand's visibility across ChatGPT, Gemini, Claude, and Perplexity, straight from your store.

Live · merchandising

Section Store

A library of ready-to-use, customisable theme sections, so merchants can build richer pages without touching code.

Client builds

Built for real use

A sample of the work we have shipped for clients in India and abroad, from deep integrations to focused tools built for one job.

Integration · logistics

Shopify ↔ OCS Logistics

A custom Shopify app connecting Shopify stores with OCS logistics software, so orders, shipping, and tracking move without manual work.

Custom Shopify appConnected to OCSLess manual work

Middleware · loyalty

Omnichannel loyalty bridge

Two separate Shopify apps built as middleware, connecting stores with omnichannel loyalty software so points and rewards stay in sync.

2 middleware appsOmni channelIn sync in real time

ERP · sync

ERP & inventory sync

Real-time sync between Shopify and back-office systems, and virtual inventory tied to ERP, cutting manual reconciliation and errors.

Real-time syncERP connectedFewer errors

Catalogue · bulk

Bulk catalogue tooling

Bulk tag and metafield management that fills the gap Shopify's native UI leaves, with smart filtering and audit logs.

Bulk editingSmart filteringAudit logs

Marketplace · headless

Headless marketplace

A headless Shopify marketplace with maker profiles and custom subscriptions, plus a curated product discovery platform with smart search.

Headless buildCustom subscriptionsSmart discovery

Custom · India & abroad

Purpose-built apps

Multiple small to mid-sized custom apps for specific client use cases, across India and international markets. If a tool does not exist, we build it.

Many use casesIndia & abroadFit for purpose

Related work and guidance

See the decisions behind the work.

Read project stories and practical guides that show how we approach the problems this practice solves.

Case Study

The Storefront Wasn't the Bottleneck: How I Was a Sari Connected Shopify and ERPNext

How an international sustainable-fashion brand brought its storefront, inventory and fulfilment data into one dependable flow.

Read the article Guide

To ERP or not ERP? That is the question.

How to tell whether a Shopify store needs an ERP or simply cleaner operations and better-connected tools.

Read the article

Frequently asked

Questions, answered.

What teams ask before scoping a custom build — app types, integrations, publishing and maintenance.

Custom Shopify apps (public and private), web applications, and mobile apps for iOS and Android, on a scalable stack. We serve commerce and non-commerce businesses, from internal tools and SaaS platforms to customer-facing apps. AI is included where it genuinely helps, and left out where it does not.