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APIs & integrations
that keep your systems in sync.

Your CRM, store, ERP and payment tools are only as reliable as the links between them. Senior engineers plan, test and build those links so they recover from failures on their own. 4,500+ projects delivered since 2004.

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Every integration mapped first · Clear IP & Ownership Terms

Brands our teams have delivered for

  • Hello Peter
  • Gruber Logistics
  • Delhivery
  • Thomson Reuters
  • Qatar Airways
  • Grundfos
  • Save
  • BERD
  • Yale University
  • Kuwait Police
  • Dubai Police
  • Panasonic
  • Infosys
  • Kia
  • Hitachi
  • Orange Business Services
What we do

PixelCrayons builds APIs and integrations: the links between your application and every other system it must talk to. An API is how two pieces of software talk. We keep your CRM, ERP, payment and shipping tools in sync with updates that retry until they arrive. We work direct for brands and white-label for agencies.

  1. A map of your systems, before any codeWhich system owns each record, and which way each field flows, mapped before any code.
  2. Third-party API integration, built to cope with failureCRMs, ERPs, payment and shipping platforms connected through official APIs, tested safely first, every call logged.
  3. Reliable webhooks, so no update is lostUpdates queued and retried, repeats spotted, and failures kept for a person to check.
Our work

See what we've built
and the results it brought.

Real projects for real clients, with results we can show.

All case studies →
2004
Established
500+
Agencies served
4,500+
Projects delivered
340%
Revenue growth · 7 months
eCommerce
+127%
Organic traffic · 5 months
SaaS
85%
Faster delivery · backlog cleared
via agency partner
Clutch rating 4.9 / 5, checked 15 September 2026Read our GoodFirms reviews
Google Partner
Shopify Partner
ISO/IEC 27001 certification seal (QRO), held by the Vinove groupISO 9001:2015 certification seal (QRO), held by the Vinove groupCMMI Level 3, held by the Vinove group
Technologies we work with
Commerce and web
  • Shopify
  • WooCommerce
  • Magento
  • WordPress
  • Webflow
  • Next.js
Marketing
  • Google Ads
  • Meta Ads
  • GA4
  • Klaviyo
Cloud
  • AWS
  • Microsoft Azure
  • Google Cloud
AI models
  • OpenAI
  • Anthropic
  • Google Gemini
Build and deploy
  • Docker
  • Kubernetes
  • Terraform
  • GitHub Actions
CRM and automation
  • HubSpot
  • Salesforce
  • Zapier
  • n8n

Product names and marks are trademarks of their owners. Naming a technology means our teams build with it. It does not mean a partnership, certification or endorsement.

  • Every integration mapped before anything switches
  • Webhooks built to retry until delivered
  • Partner APIs versioned and documented
  • Reply within four business hours (typical)
  • 4,500+ projects delivered since 2004
  • Clear IP & Ownership Terms
In every integration

What our API and integration work
includes.

01

A map of your systems, before any code

Every project starts with a map. It shows which system owns each record (customers, orders, stock, invoices) and which way each field flows. Most 'integration bugs' are really two systems that each think they own the same record. Settling this on paper first costs far less than untangling it on a live system.

Before build
02

Third-party API integration, built to cope with failure

We connect CRMs, ERPs, payment gateways, shipping and logistics platforms through their official APIs. We test in a safe practice copy (a sandbox) before going live. We stay within each service's usage limits, handle every kind of failure and log every call. Outside services go down and change their APIs. An integration that ignores this will cost you later.

Every build
03

Reliable webhooks, so no update is lost

A webhook is an automatic message one system sends another when something happens. We design them to arrive. Each message waits in a queue and is retried if the receiver is down. Repeats are spotted, so nobody is charged twice and no order ships twice. Messages that still fail are kept for a person to check. Monitoring tells you before your customer does.

Every build
04

APIs your partners can build on safely

When outside developers build on your API, treat it as a product. We number each version from the first release, so updates don't break existing users. The documentation comes from the code, so it stays accurate. Logins and sensible usage limits are built in. A written policy for retiring old versions lets you improve the platform without letting partners down.

Every release
05

Connecting software, monitoring and a full handover

The software that keeps your platforms in sync is handed over so your team can run it. It is logged, monitored and explained in simple how-to guides anyone can follow at 2am. Passwords sit in your own secure store, and the code is in your accounts from day one. Bespoke deliverable rights, licences and handover are agreed before work starts.

In writing
The process

How an integration project starts,
step by step.

01
Start

Brief and a call

We sign an NDA. Then we go through your systems: which platforms, which records, where each record lives today and where syncing goes wrong.

02
Once the brief is complete

Itemised proposal

We confirm the date your proposal arrives. It names each integration, the direction of every sync, the failure handling and the price.

03
Your decision

You sign off

You confirm the scope, the payment and the access we need. Nothing starts before this.

04
Typically 2 to 3 business days later

The team starts

We arrange test access to each platform and agree in writing which system owns each record. The code and automated checks are set up in your accounts.

05
On the date in your proposal

First deliverable

The first integration runs on a test site, shown on a call. We prove the retries work by switching systems off.

Inside Prism

Your engagement, week to week,
in one workspace.

Prism is the client workspace where your requests, approvals, tasks and weekly reviews live.

Some engagements include Prism, our client workspace, and your proposal says whether yours does. Where it does, your build runs in a workspace you log into: requests, approvals, the task list and the weekly review, beside the repository your team already owns.

See how Prism runs an engagement
  • 01

    Requests and approvals

    One queue, beside the repository your team owns.

  • 02

    Owned tasks

    Every task has one owner and a date.

  • 03

    Weekly review

    Each decision recorded, with the expectation attached.

How we report it, in Prism

The delivery record,
you can read without a stand-up.

What you receive in month one

Development is reported as artefacts in your own tools, not a status call. In the first month you receive the technical audit of the current codebase, the delivery plan broken into reviewed increments with acceptance criteria, and the environment map showing where code runs and who can deploy it. The weekly review in Prism lists what merged, what was reviewed, and what is blocked and by whom.

  • 01Technical audit: the current codebase, its risks, and the order of fixes
  • 02Delivery plan: increments with acceptance criteria and review owners
  • 03Environment map: development, staging and production, and who deploys
  • 04Weekly review in Prism: merged, in review, blocked, and the reason for each block
  • 05Definition of done: tests, review, accessibility and performance checks per increment

Related workCasadar: a bilingual marketplace for everything that makes a home.Home & Interiors · Marketplace · A published case in this discipline.

Casadar homepage on desktop: a search bar for products, vendors and professionals, category icons for bedroom, kitchen, furniture, home office, décor, appliances and housekeeping, a living-room banner and a row of products
Casadar’s site, captured 9 October 2026
Platforms we connect

The systems we
connect most.

Good integration work needs deep knowledge of each platform. These are the ones our projects connect most, through official APIs and tested safely first. If yours isn't listed, ask. When a platform is new to us, we say so and price the research separately.

Content & CMS

We build, design and look after these sites, including the editor your team uses every day.

Commerce platforms

Online stores, moves to a new platform and the checkouts your sales go through.

CRM

One record per customer: kept in sync, free of duplicates and clear for your sales team.

Related services

Services that work
with your integrations.

Replacing a platform costs money, so most projects start by getting more from the one you have. Each service here is one you can buy on its own, from the same team.

01Back-End DevelopmentThe core of your application: the data, logins and rules your integrations serve.02Front-End DevelopmentThe screens that show what your integrations keep in sync.03MigrationsPlatform moves with zero data loss, where careful mapping matters most.04DevOpsAutomated releases and monitoring that show how your live syncs are running.

Where integrations pay off fastest

This work pays off fastest in two places. In online shops, your store, payments, stock and shipping must agree on every order. In automation, AI workflows are only as good as the systems they can reach. Each has its own page.

eCommerce developmentAI workflow automationAll development services
Who is accountable

The people responsible
for your work.

Leadership and how we’re built →
Parvessh Agarwal

Parvessh Agarwal

Founder & CEO

An entrepreneur at heart. He links business analysis, strategy, clear goals and ROI to practical technology.

LinkedIn →
Saundaraya Gupta

Saundaraya Gupta

Technical Manager

Brings technical work, client updates and project management together, so work moves smoothly from brief to launch.

LinkedIn →

Every engagement

A named coordinator and escalation contact

Know who coordinates your engagement, who owns the work and how to escalate an issue.

All engagements. Roles may be combined and vary with your engagement.

Full terms →
Before you sign

Our commitments

Each one says where it applies and links to its full terms.

Response and start times

We typically respond within four business hours. Eligible engagements can typically start within two to three business days after scope, payment and required access are confirmed.

Business hours are Monday to Friday, 9:00 am to 6:00 pm IST, excluding published company holidays. Typical expectations, not guaranteed service levels.

Full terms

30-Day Corrective Maintenance

Applicable development work includes 30 days of corrective maintenance after production launch.

Development engagements, including partner (agency) development engagements and AI implementations; not marketing services or retainers.

Full terms

Clear IP & Ownership Terms

Your materials remain yours. Bespoke deliverable rights, licences and handover are agreed before work starts.

All engagements.

Full terms

Clear Delivery & Escalation Ownership

Know who coordinates your engagement, who owns the work and how to escalate an issue.

All engagements. Roles may be combined and vary with your engagement.

Full terms

How we handle claims, credentials and your data: group credentials, dated ratings, how case figures are signed off, client permissions and data handling.

Planning for failure

When a sync goes wrong,
what the integration does.

Third-party services go down and change their APIs. We design each integration around what happens when they do, and show you that design instead of quoting an uptime figure.

What goes wrongWhat the integration doesWhy
Two systems both think they own a recordWe agree which system owns it on the map, before any codeMost integration bugs start here. Settling it on paper costs less than untangling it on a live system.
The receiving system is downThe update waits in a queue and is retried, with longer gaps each timeA receiver being down means delay, not loss.
The same update arrives twiceThe handler recognises the repeatA repeated update can never charge a card twice or ship an order twice.
Retries run outThe update goes to a holding list for a person to checkIt doesn't flood the receiver for ever, and it doesn't quietly disappear.
A platform rate-limits calls or changes its APIWe stay within usage limits, log every outside call and test each build in a sandbox firstAn integration that assumes outside services never change will cost you later.
A sync breaks quietlyMonitoring raises an alertYou hear about a broken sync from an alert, not from a customer.

We show the first integration on a test site and prove the retries work by switching systems off.

Questions

Frequently
asked.

Back-end development builds the core of your application: its data, rules, logins and background tasks. API and integration work connects that core to the systems your business runs on, such as your CRM, ERP, payments and shipping. It also opens it safely to partners. Most projects need both, and here one team does both.

Most of them. That includes CRMs, ERPs, accounting tools, payment gateways, shipping providers, marketing and support tools, and online store platforms. We use official APIs wherever they exist. How we build matters more than the platform: test first, stay within limits, handle failures. If a platform is new to us, we say so and price the research honestly.

We expect things to fail and plan for it. Updates wait in a queue, so if a system is down they arrive late but aren't lost. Updates that keep failing go to a holding list for a person to check. Repeats are spotted, so nobody is charged twice and no order ships twice. Everything is logged and monitored, so an alert tells you about a broken sync before a customer does.

Yes, and we treat custom API development as building a product. Each version is numbered from the first release, and the documentation comes from the code, so it stays accurate. It includes logins, usage limits and a written policy for retiring old versions. Where it helps partners get started, we also provide example code and a test environment.

Your materials, data and accounts remain yours. Agreed ownership rights in bespoke deliverables transfer under the engagement terms and applicable payment; third-party software and assets keep their licences. We don't withhold customer-owned data or accounts over a payment dispute. Credentials sit in your vault, and runbooks and integration maps are handed over with the work.

Yes. Many agencies use us as their API integration company behind the scenes. The work runs inside the client's own systems, so nothing carries our name. It's covered by an NDA, and we don't approach the clients you introduce to us for direct business, through the work and for twelve months after the last assignment for that client ends.

The range

What it costs,
at the direct rate.

A fixed quote to build the connections, and a per-connector rate to add systems later. A fixed quote for an API your partners use, and monthly support once the syncs carry real orders.

  • ProjectIntegration build$950–$10Kfixed quote, one-time
  • Per unitAdditional connector$375–$2,500per connector
  • ProjectPartner-facing API$5,000–$25Kfixed quote, one-time
  • RetainerMonthly support$250–$1,875per month

Indicative: every figure is refined into an itemised proposal.INR figures shown excl. GST.

PricingSee indicative pricing for this serviceDirect and wholesale, in ₹ and $ →

Make your systems
agree with each other.

Tell us which platforms have to talk, and where the syncs hurt today. Once we have a complete brief, we confirm the date you will receive your itemised proposal.

Get a ProposalGet a Free Website Review

Reply within four business hours (typical) · NDA standard · Clear IP & Ownership Terms

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