Backend
Node.js
Runs the server side of apps: fast, scalable back ends that power your app, website and integrations.
Used for
- App back ends
- Live order tracking
- Chat and notifications
- Payment processing
REST · GraphQL · Webhooks · Integrations
API development
APIs that power your mobile and web apps, expose services to partners and connect your systems to payment, logistics and government platforms.
At a glance
The short version
What it is
Secure, documented REST and GraphQL APIs, plus integrations that connect your apps to payment, logistics, GST, messaging and business systems.
- What we build
- How it works
- Mobile app
- Your API
- Payment gateway
- Maps and courier services
- 2 more
- Runs on
- Web app
- Cross-platform
- Android
- iOS
- Admin
- Built with
- Who it's for
- Cost depends on
- Business logic
- Third-party providers
- Regulated data
How to start
Tell us what you need in your own words. You talk to the developers who would build it and get a written, line-item estimate.
Get a project estimateContract first, code second
Every app and dashboard we build talks to an API, so API design gets deliberate attention rather than growing screen by screen. We write the contract first, as an OpenAPI specification or GraphQL schema, agree it with the teams who will consume it, and generate typed clients and a mock server so front-end work can start early.
Good API development is mostly about the unhappy paths: a retry after a timeout, a webhook arriving twice, a provider changing a field without notice, a mobile app two versions behind. We design for each of these explicitly.
What goes into a production-grade API
Authentication and authorisation
OAuth 2.0 and short-lived tokens for apps, scoped keys for partners, object-level checks on every request.
Versioning
Explicit versions, changelogs and deprecation windows for partners.
Rate limits and quotas
Per-key limits, burst control and usage metering backed by Redis.
Idempotent writes
Idempotency keys on order and payment endpoints, so retries never create duplicates.
Signed webhooks
Retries with backoff and a delivery log that consumers can inspect.
Docs and observability
Interactive OpenAPI docs, Postman collections, correlation IDs and error-rate alerts.
Integrations
Third-party services we integrate
Payments
Razorpay, PhonePe and Paytm
UPI intent and QR flows, refunds, payment links and reconciliation.
Tax
GST e-invoicing and e-way bills
IRN and e-way bill generation via an authorised GST Suvidha Provider.
Logistics
Shiprocket, Delhivery and courier APIs
Serviceability, rates, AWB generation, pickups and tracking.
Messaging
WhatsApp Business Platform
Approved templates for updates and OTPs; inbound messages via Cloud API webhooks.
Identity
eKYC and DigiLocker
Aadhaar-based eKYC and PAN checks through licensed providers; consented DigiLocker fetch.
Finance
Account Aggregator framework
Consented bank statement retrieval via RBI-licensed Account Aggregators.
Commerce
ONDC
Buyer-side or seller-side participation through Beckn-based protocol APIs.
Accounting
Tally and ERP systems
Ledger, voucher and stock sync, or REST connections where offered.
Maps & AI
Google Maps Platform and LLM APIs
Geocoding and routes; model APIs behind your own endpoint with spend limits.
Solutions
Solutions that depend on integration work
Next.js storefronts on a headless commerce engine and CMS, for brands that need speed, several storefronts or content-led shopping.
Multi-vendor marketplaces with seller onboarding, commission rules, split payouts, per-seller invoicing and catalogue moderation.
Aggregator delivery platforms where many local vendors sell through one app, with vendor onboarding, commissions, settlements and shared dispatch.
A central order management system that collects orders from every channel, routes them to the right location and tracks them to delivery and payment.
Secure fintech apps and back offices for payments, lending, investments and insurance, integrated with licensed banking, KYC and data partners.
Digital wallet apps with top-ups, QR payments, rewards and a balance ledger, for closed-loop programmes or with a licensed PPI issuer.
Search and question-answering over your documents, tickets and product data, with hybrid retrieval, citations and permission-aware results.
How it works
What happens behind one tap on “Place order”
Your app never talks to the payment gateway, SMS provider or maps service directly: the API sits in the middle and keeps every step safe.
- Mobile app
Step 1: Customer taps “Place order”
The app sends the order to your API with a unique request key, so a double tap or an automatic retry on a weak network can never create two orders.
- Your API
Step 2: The API checks and saves the order
It confirms who the customer is, recalculates prices and stock on the server rather than trusting the app, and saves the order before anything else happens.
- Payment gateway
Step 3: The payment gateway collects the money
The API starts a UPI or card payment; when it succeeds, the gateway sends a signed message (a webhook) back to the API, which marks the order paid.
- Maps and courier services
Step 4: Maps and courier details are worked out
The API checks that the address is serviceable, estimates the delivery time using a maps service and books a pickup through the courier’s API.
- Messaging provider
Step 5: SMS or WhatsApp confirmation goes out
An approved SMS or WhatsApp template confirms the order, even if the customer has already closed the app.
- Mobile app and admin panel
Step 6: The app and admin panel update together
The customer sees “Order confirmed” and your staff see the new order, because both read the same data from the same API.
Platforms
Apps and screens your API will serve
One API can power your website, your apps for Android and iPhone and your admin dashboard at the same time, so they always show the same data.
- Web
Web application
Browser-based applications with logins, roles and workflows, such as customer portals, SaaS products and internal tools.
- Mobile
Cross-platform mobile app
One Flutter or React Native codebase for Android and iOS, with native modules where a feature needs them.
- Mobile
Android app
Apps for Android phones and tablets, tested on budget and mid-range devices and published on Google Play or privately.
- Mobile
iOS app
Apps for iPhone and iPad, built to Apple's guidelines and released through TestFlight and the App Store.
- Back office
Admin dashboard
Back-office panels for operations, support and finance teams: orders, users, content, reports and permissions.
Technology
What we build APIs with, and why
Node.js and NestJS handle many requests at once, Python suits data-heavy work, PostgreSQL or MongoDB store the data, Redis handles rate limits and caching, and Docker with hosting built on AWS keeps every release consistent.
Backend
NestJS
A structured way to build back ends on Node.js, so large business systems stay organised, testable and easy to hand over.
Used for
- Business app back ends
- SaaS platforms
- Marketplaces
- Admin panel back ends
Backend
Python
A programming language for AI features, data processing and automation: the engine behind document reading, reports and smart search.
Used for
- AI features
- Document reading
- Reports and analytics
- Task automation
Data
PostgreSQL
A reliable database for the records your business runs on: orders, payments, bookings and stock, kept accurate and easy to report on.
Used for
- Orders and customers
- Payments and ledgers
- Stock and inventory
- Bookings
Data
MongoDB
A flexible database for records that vary a lot from one to the next, such as mixed product catalogues, content and activity logs.
Used for
- Product catalogues
- Content and articles
- Activity logs
- Chat messages
Data
Redis
Keeps frequently used data in fast memory, so apps stay quick on busy days and live features like order tracking feel instant.
Used for
- Faster apps
- Live order status
- Shopping carts
- Job queues and alerts
Cloud & DevOps
Docker
Packages your software so it runs the same way on every laptop and server, which makes releases predictable and moving hosts easier.
Used for
- Reliable releases
- Same setup everywhere
- Faster onboarding
- Easy scaling
Cloud & DevOps
AWS
Cloud hosting for your app, website and data, with data centres in India and room to grow when traffic rises.
Used for
- App hosting
- File and photo storage
- Backups
- Busy sale days
Comparison
REST, GraphQL or webhooks?
| REST | GraphQL | Webhooks | |
|---|---|---|---|
| Good fit for | Partner and public APIs | Screens combining data from several sources | Telling another system something changed |
| Main trade-off | Over- or under-fetching on complex screens | Query cost controls and heavier tooling | Receivers must verify signatures and handle retries |
Plain-English glossary
API terms, in plain English
- API
- An agreed way for one piece of software to ask another for data or an action, like your app asking your server for today’s orders. Think of it as a service counter: requests go in, answers come back, and the kitchen stays private.
- Webhook
- An automatic message one system sends to another when something happens, such as a payment gateway telling your server “this payment succeeded”. It saves your system from asking again and again.
- Idempotency key
- A unique tag on a request, so that if the same request arrives twice after a network hiccup it is processed only once. It is what stops a customer being charged twice or an order being duplicated.
- Rate limit
- A cap on how many requests a user or partner can make in a minute. It stops one heavy user or a faulty script from slowing the service down for everyone else.
- OpenAPI specification
- A written, machine-readable description of every API endpoint, its inputs and its answers. Developers on both sides build against it, and interactive documentation is generated from it.
- Sandbox
- A test version of a provider’s service, such as a payment gateway, where pretend transactions can be run safely before real money is involved.
Product preview
What your team sees when the API is running
Illustrative screens from an integration dashboard and the customer app it serves.
Integration dashboard. The dashboard lists every outside service the API talks to, how busy it is and whether it is healthy, so problems surface before customers notice. 
Integration dashboard. Every message from a provider is logged, and a duplicate payment confirmation is recognised and ignored, so no order is marked paid twice. 
Customer app. On the customer’s phone, each status comes from the API, which gathers it from the gateway, the courier and the messaging service behind the scenes.
Illustrative preview
Sample screens: names, prices and figures are examples, not client data.
Work
Illustrative projects that rely on APIs
Sample projects, not client work, where payment, messaging, maps and accounting integrations carry much of the product.
Delivery app development
Illustrative sampleHyperlocal grocery delivery platform
An illustrative platform for neighbourhood grocery stores: slot or express delivery, store picking, batched delivery runs, and payment by UPI or cash on delivery.
- Retail
- Mobile + web platform
Runs on
- Android
- iOS
- Cross-platform
- Admin
Built with
- Flutter
- NestJS
- PostgreSQL
- Redis
- AWS
- +1 more
AI solutions
Illustrative sampleAI customer support assistant for a D2C brand
An illustrative AI assistant that answers order, return and product questions from a D2C brand's own policies and order data, with sources and a human hand-off.
- E-commerce
- AI assistant
Runs on
- Website
- Admin
Built with
- Next.js
- Python
- OpenAI APIs
- LLM integrations
- PostgreSQL
- +1 more
E-commerce & marketplaces
Illustrative sampleB2B wholesale ordering app
An illustrative ordering app for a distributor's retailers and sales team, with tier pricing, credit limits, trade schemes and GST invoicing.
- B2B commerce
- Mobile app + web admin
Runs on
- Android
- iOS
- Cross-platform
- Admin
Built with
- React Native
- Node.js
- PostgreSQL
- Redis
- AWS
- +1 more
Healthcare software
Illustrative sampleClinic booking & telemedicine app
An illustrative patient app, doctor app and clinic admin for in-person and video consultations, with digital prescriptions and consent-based record access.
- Clinics
- Patient + doctor apps
Runs on
- Android
- iOS
- Cross-platform
- Admin
Built with
- Flutter
- NestJS
- PostgreSQL
- AWS
- Firebase
- +1 more
Business software
Illustrative sampleFleet & dispatch management SaaS
An illustrative SaaS for businesses running their own vehicles: live dispatch on a map, driver proof of delivery and per-trip billing for each customer.
- Transportation
- SaaS
Runs on
- Web app
- Android
- iOS
- Cross-platform
Built with
- React
- React Native
- Node.js
- PostgreSQL
- Redis
- +1 more
Industries
Sectors where integrations carry the product
Cost drivers
What an API project's effort depends on
Business logic
Endpoints that price, reserve stock or move money need far more design and testing than simple reads.
Third-party providers
Each provider brings its own sandbox behaviour, onboarding steps and edge cases.
Regulated data
Financial or health data adds audit logging, consent handling and review work.
Performance targets
High volumes or tight latency budgets need caching, queues and load testing.
Estimates are written from your scope, with the effort and assumptions behind each line item.
How pricing worksProcess
How we deliver an API or integration
Consumer review
Who calls the API, how often, and what data each consumer may see.
You getAccess matrix
Contract design
Resources, errors and pagination as an OpenAPI or GraphQL schema, reviewed with consumers.
You getApproved specification and hosted mock
Build and test
Contract tests, provider sandbox tests and load tests on the heaviest endpoints.
You getTested API on staging
Security review
OWASP API Security Top 10 checks, including broken object-level authorisation.
You getSecurity checklist
Launch and monitoring
Gradual rollout, dashboards, alerts and published documentation.
You getLive API and developer docs
FAQ
Frequently asked questions
How do you make payment gateway webhooks reliable?
We treat webhooks as messages that may arrive late, twice or out of order. Each signature is verified, the raw event is stored before processing, and handlers are idempotent, so a repeated payment-captured event cannot mark an order paid twice. A scheduled job reconciles our records against the gateway’s settlement data and flags mismatches, such as a customer closing the app mid-payment.
Can you document and fix an API that another team built?
Yes. We describe the running API in an OpenAPI document built from its code and observed traffic, which usually surfaces undocumented fields, inconsistent error formats and endpoints missing authorisation checks. Security issues are fixed first. We then introduce a versioned, documented contract that consumers can adopt gradually, keeping the old behaviour available for an agreed deprecation period.
How do you protect personal data that passes through an API?
We return only the fields each consumer needs, mask identifiers such as phone and account numbers, and enforce object-level checks so nobody can fetch another user’s record by changing an ID. Tokens are short-lived and access is logged. We build the consent and erasure flows the Digital Personal Data Protection Act 2023 expects, and follow ABDM or Account Aggregator specifications where they apply.
Can an API connect to a legacy system that has no API of its own?
Often, yes. Options include reading the legacy database through a restricted read-only account, exchanging scheduled files over SFTP, or running a small adapter service beside the old system. Whichever works, we wrap it in a documented API so new apps never touch the legacy system directly, which makes replacing it later far easier.
Next step
Need an API built, fixed or connected?
Tell us which systems need to talk to each other, and we will propose a contract, a plan and an estimate.