Your CRM, store, ERP and payment tools are only as reliable as the connections between them. Senior engineers build those connections to be mapped, tested and retried, never hoped for. 4,500+ projects delivered since 2004.
Every integration mapped first · Clear IP & Ownership Terms
In one answer
PixelCrayons builds APIs and integrations: the connective tissue between your application and every other system it must talk to. Back-end development builds your application's core; this service connects that core to the outside (CRMs, ERPs, payment and shipping platforms), kept in sync through webhooks (the automatic messages systems send each other when something changes) that retry until delivered, and exposed to partners through versioned, documented APIs. IP and ownership terms are agreed before work starts. Direct for brands, white-label for agencies.
Every integration mapped before anything switches✦
Webhooks built to retry, not to hope✦
Partner APIs versioned and documented✦
Reply within four business hours (typical)✦
4,500+ projects delivered since 2004✦
Clear IP & Ownership Terms✦
Every integration mapped before anything switches✦
Webhooks built to retry, not to hope✦
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 integration work actually includes.
01
The integration map, before any code
Every engagement starts by mapping which system owns which record (customers, orders, stock, invoices) and which direction each field flows. Most 'integration bugs' are really two systems that both think they own the truth. Settling ownership on paper first is cheaper than discovering it in production reconciliation.
Before build
02
Third-party integrations, built defensively
CRMs, ERPs, payment gateways, shipping and logistics platforms connected through their official APIs, in sandbox before production. Rate limits respected, failure modes handled, every external call logged. Third-party services go down and change their APIs. An integration built as if they won't is a debt, not an asset.
Every build
03
Webhook reliability engineering
Delivery you can trust is designed, not assumed. Events are queued rather than fired and forgotten, and retried when a receiver is down. Handlers recognise a repeated event, so a replay never double-charges or double-ships. Events that still fail are captured for a human to inspect, and monitoring tells you before your customer does.
Every build
04
Versioned APIs your partners can build against
When outside developers build on your API, the API is a product. Versioned from the first release, documented from the code so the docs can't drift, with authentication and sane rate limits. A written deprecation policy means you can evolve the platform without breaking the partners who took a bet on it.
Every release
05
Middleware, monitoring and a full handover
The sync services between platforms are delivered as software your team can operate: logged, monitored, documented in runbooks readable at 2am. Credentials sit in your vault and the repository in your accounts from day one. Bespoke deliverable rights, licences and handover are agreed before work starts.
In writing
The process
From systems walk to a sync you can trust.
01
Days 1 to 2
NDA signed, systems walked
We sign the NDA and walk your stack together: which platforms, which records, where the truth lives today and where syncs currently hurt.
02
Complete brief
Proposal, integrations itemised
Once we have a complete brief, we confirm the date you will receive your itemised proposal: a priced scope naming each integration, the direction of every sync and the failure handling, so you compare deliverables, not day rates.
03
Week 1
Sandboxes up, contracts mapped
Sandbox access to each platform arranged, data ownership settled in writing, repository and CI live in your accounts, the first integration underway.
04
Staging
First integration on staging
A real sync running against sandboxes, demoed on a call (events flowing, retries proven by unplugging things) not a diagram about progress.
Inside Prism
Your engagement, week to week, in one workspace.
Where the engagement includes it, your build runs in a Prism workspace you log into: requests, approvals, the task list and the weekly review, beside the repository your team already owns.
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
Integration work is only as good as the platform knowledge behind it. These are the platforms most engagements connect, through official APIs, sandbox first. If yours isn't listed, ask: when a platform is new to us we say so and price the discovery as discovery.
Content & CMS
Build, theme and maintain, including the editor experience your team uses daily.
Replacing a platform is a decision with a cost, so most engagements start by making the one you have work harder. Each neighbour here is a service you can buy on its own, from the same team.
The two places this work pays fastest: commerce, where storefront, payments, stock and shipping must agree on every order, and automation, where AI workflows are only as good as the systems they can reach. Both are their own disciplines here.
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.
Every delivery is reviewed before release by QA, your Project or Account Manager and a senior delivery lead, and you then review it against the acceptance criteria agreed at the start. Our specialists use AI to support delivery, with people responsible for reviewing the work. Applicable development work includes 30 days of corrective maintenance after production launch.
Who owns the ad accounts, the data and the work?
Your materials, data and accounts remain yours, and we prefer to work in advertising and analytics accounts you own, with access delegated to our team. Agreed ownership rights in bespoke deliverables transfer under the engagement terms and applicable payment; third-party software and assets keep their licences. We do not withhold customer-owned data or accounts over a payment dispute.
What if we want to stop?
Cancellation, notice and any renewal terms are written into your proposal or statement of work before you accept it. If an engagement ends early, we hand over completed, paid-for work and list any unfinished work separately. For an eligible specialist trial, you can stop within the trial window and pay nothing for eligible trial hours.
How will we know what you are doing?
Before work starts we agree how often you get updates, what the reports cover and who sends them. You know who coordinates your engagement, who owns the work and how to escalate an issue. For hourly and retainer work, time is recorded in Workstatus, so you can see the time records behind your invoice.
Back-end development builds your application's core: the data models, business logic, auth and jobs that make your product what it is. API and integration work is the connective tissue: linking that core to the other systems your business runs on (CRM, ERP, payments, shipping) and exposing it safely to partners. They're separate services because they fail differently. A back end fails on its own logic, an integration fails on someone else's. Most engagements touch both, and here it's one team, so the seam between them is engineered rather than argued over.
Third party API integration here covers the categories most businesses run: CRMs, ERPs and accounting platforms, payment gateways, shipping and logistics providers, marketing and support tools, and commerce platforms, through their official APIs wherever one exists. The answer to 'do you know our exact platform?' is that the specific pairing matters less than the discipline: sandbox-first builds, rate limits respected, failures handled. If a platform is new to us we say so. We start in its sandbox and price the discovery honestly rather than pretending familiarity.
By assuming failure and designing for it. Events are queued rather than fired-and-forgotten, so a receiver being down means delay, not loss. Retries back off and give up into a dead-letter queue a human can inspect, rather than hammering forever or vanishing silently. Handlers recognise repeats, so a replayed event can never double-charge a card or double-ship an order. And everything is logged and monitored, so you find out about a broken sync from an alert, not from a customer. What we won't quote is an invented uptime percentage; we show you the design instead.
Yes, and we treat custom API development as a product, not an endpoint dump. Versioning from the first release so you can evolve without breaking early adopters, documentation generated from the code so it can't quietly drift, authentication and rate limiting appropriate to who is calling, and a written deprecation policy so partners get commitments rather than surprises. Where it helps adoption, we also deliver example clients and a sandbox environment. An API partners can try in an afternoon is an API that gets built on.
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 do not withhold customer-owned data or accounts over a payment dispute. API keys and credentials for every connected platform sit in your vault, not ours. Runbooks and integration maps are maintained as we build and handed over as part of the deliverable, and open-source dependencies keep their standard licences, documented in handover. If you leave, every connection keeps working and your team knows how each one runs.
Yes. Many agencies use us as their API integration company behind the scenes. Integration work white-labels naturally, because it ships as working syncs inside the client's stack rather than as anything branded. Your project tools, your client calls, our engineers behind the scenes. It is NDA-backed. We do not approach the clients you introduce to us for direct business. That protection runs through the work and for twelve months after the last assignment for that client ends, and it is written into the agreement.
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.
