deependra.in

Local time in MUMBAI · UTC+5:30 ·

API development and integrations

APIs other teams can build on, and integrations with payments, CRMs and SaaS tools that never lose data quietly.

Price
Fixed quote per integration or API
Timeline
Scoped per integration after mapping the systems
Engagement
fixed-scope project

REST and GraphQL APIs with OpenAPI documentation, authentication and rate limits, and integrations with Stripe, CRMs, social platforms and the rest of your SaaS stack. Every integration gets retries, idempotency, signed webhooks and alerts. Exhibit Social pulled data from the Meta Graph and YouTube Data APIs this way.

  1. 01

    API source code with integration tests

  2. 02

    OpenAPI documentation and a request collection for testing

  3. 03

    Webhook receivers with signature checks, retries and a dead-letter queue

  4. 04

    OAuth flows for connecting third-party accounts

  5. 05

    Logging, alerting and a runbook for failed syncs

Who this is for

  • Mobile and web teams that need a backend API they can rely on
  • Businesses whose billing, CRM and operations tools still sync by hand
  • Products adding Stripe subscriptions, marketplace payouts or usage-based billing

Who this is not for

  • Simple triggers a no-code tool already handles well
  • Scraping sites whose terms forbid it

What this service is

API development and integrations is building REST and GraphQL APIs that other teams can build on, and connecting your product to payments, CRMs, social platforms and the rest of your SaaS stack so that data never goes missing quietly. It is for mobile and web teams that need a backend API they can rely on, businesses whose billing and CRM still sync by hand, and products adding Stripe subscriptions, marketplace payouts or usage-based billing.

Exhibit Social, the B2B influencer platform I led, pulled its data from the Meta Graph and YouTube Data APIs through rate-limit-aware clients with request queues and exponential backoff, which is how it kept 10,000+ influencer profiles current without tripping API limits.

Scope

One API, or one integration between named systems. Mapping comes first: which system holds which data, which one is the source of truth for each field, and what happens when each one fails or is slow. The contracts are then written down: endpoints, payloads, errors, versioning and security, agreed before the build so both sides can work in parallel.

What is built and checked

APIs get authentication, rate limits, consistent errors and an OpenAPI document generated from the code, with an example for every endpoint and a changelog so existing clients don't break.

Integrations are built for the day the other side fails. Outgoing calls retry with exponential backoff, and where the provider supports idempotency keys a retried request can't charge or create twice. Incoming webhooks are verified before anything is trusted; with Stripe, that means checking the signature header against the raw request body and your signing secret, and answering quickly before doing slow work in a queue. Repeated failures raise an alert and land in a dead-letter queue that can be replayed. Every integration is tested against the provider's sandbox, failure cases included.

What it is not

It is not a replacement for no-code tools where they work: a simple trigger that Zapier or n8n already handles well doesn't need custom code. And it is not scraping sites whose terms forbid it; integrations use the provider's official API.

How the engagement runs

  1. Map the systems

    Which systems hold which data, who is the source of truth, and what happens when each one fails.

  2. Design the contracts

    Endpoints, payloads, errors, versioning and security, written down and agreed before the build.

  3. Build against sandboxes

    Every integration tested against the provider's test environment, failure cases included.

  4. Go live with monitoring

    Alerts on repeated failures, dashboards for sync health and a way to replay what failed.

Technologies I use for this

  • Laravel
  • Node.js
  • Python / FastAPI
  • REST
  • GraphQL
  • OpenAPI
  • OAuth 2.0
  • Stripe
  • Redis
  • Webhooks

How this works in your market

How this works in the United States

For US SaaS teams, billing is the most common integration: Stripe subscriptions with upgrades, downgrades and proration, driven by Stripe's webhooks rather than by what the browser says happened. Your morning overlaps my evening, which is when integration tests against sandboxes are reviewed together.

How this works in the United Arab Emirates

For teams in the UAE, integrations are designed with data residency in mind: which fields leave the region, to which provider, and under which data-protection regime, federal, DIFC or ADGM. Where a third-party service is outside the region, the mapping says so explicitly, so your counsel can confirm the position before the build.

Questions about API development and integrations

What happens when a third-party API goes down?

The request is queued and retried with exponential backoff; repeated failures raise an alert and land in a dead-letter queue you can replay. Nothing is dropped silently.

Do you handle Stripe subscriptions and Connect?

Yes: subscriptions with upgrades, downgrades and proration, usage-based billing, and Connect for marketplaces, driven by Stripe's signed webhooks rather than by trusting the browser.

Can you build what Zapier can't?

Yes. When you need data transformation, conditional logic, volume or an audit trail, custom code is cheaper and more reliable than a long chain of no-code steps.

Is the API documented?

Always: OpenAPI generated from the code, an example for every endpoint, and versioning with a changelog so existing clients don't break.

REST or GraphQL?

REST for most public and partner APIs, because it's simpler to cache, secure and document. GraphQL when one front end needs flexible queries across many related types.

How do you handle third-party rate limits?

With queues that pace requests to the provider's limits, backoff when they say slow down, and scheduled collection instead of on-demand calls where freshness allows.

Sources

  1. OpenAPI Specification (OpenAPI Initiative)
  2. Stripe: idempotent requests
  3. Stripe: webhooks and signature verification

Case studies behind this service

Related writing

Where this work happens

Related services