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Software Development

API Development and Integration Services

Your systems are only as useful as the data flowing between them. We design clean, versioned APIs and build integrations that keep working when traffic spikes or a vendor changes something.

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  • OpenAPI-documented endpoints
  • Retries, queues and idempotency built in
  • Monitoring on every integration
Project snapshotTaking new projects
Typical timeline

First release in 8–16 weeks, then fortnightly updates

Your team

Project manager, UX designer, senior engineers and QA

Core stack
  • Node.js
  • NestJS
  • Python
  • FastAPI
  • GraphQL
  • PostgreSQL
Engagement
  • Fixed scope
  • Dedicated team
  • Time & material
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Trusted by growing brands and established enterprises

  • Shree Cement
  • Urban Ladder
  • Fortis
  • WedMeGood
  • Wooden Street
  • Wonder Cement
  • Anytime Fitness
  • NIMS University
  • Rayzon Solar
  • Naturals Ice Cream
  • Little Millennium
  • Sodhani
  • Okay Plus
  • Geetanjali Salon
  • Mahima
What we deliver

API Development & Integration services we offer

Secure, documented APIs and reliable third-party integrations.

  • REST & GraphQL APIs

    Versioned, documented APIs with authentication, rate limiting and consistent error handling.

  • Payment integrations

    Stripe, Razorpay, PayPal and bank gateways with webhooks, refunds and reconciliation.

  • CRM & ERP connectors

    Two-way sync with Salesforce, HubSpot, Zoho, SAP, Tally and Dynamics.

  • Messaging & notifications

    Email, SMS, WhatsApp Business and push notification pipelines with templates.

  • Logistics & marketplaces

    Shipping, tracking and marketplace APIs for Shiprocket, Amazon, Flipkart and more.

  • API gateways & security

    OAuth 2.0, API keys, gateways, audit logs and threat protection.

Why Flowrush

Why companies choose us for API Development & Integration

Senior engineers, transparent delivery and long-term support — the basics done right, every sprint.

  • Senior people on your project

    Your project is led by engineers with 6+ years of shipping production software, not handed to trainees.

  • You own everything

    Source code, designs, cloud accounts and IP are assigned to you. NDAs are signed before the first call.

  • Transparent delivery

    A shared sprint board, weekly reports and demo builds — you always know what was done and what is next.

  • Built to scale

    Clean architecture, automated tests and CI/CD pipelines so the product grows without a rewrite.

  • Time-zone friendly

    Overlap windows for the US, UK, Europe, the Middle East and Australia, with a Toronto office for North America.

  • Support after launch

    Maintenance plans with defined response times, security patches and monthly performance reviews.

  • 10+Years engineering software
  • 2,000+Projects delivered
  • 200+Long-term clients
  • 15+Countries served
  • 30+Industries
  • 98%Client satisfaction
Process

How we take your project from idea to launch

  1. Week 1

    Discovery & scoping

    Workshops with your stakeholders to map users, goals, constraints and the smallest release that proves value.

  2. Weeks 2–3

    UX & architecture

    Clickable prototypes, data models and a system design document you sign off before a line of production code.

  3. Ongoing

    Agile build sprints

    Two-week sprints with a demo at the end of each one, a shared board and a staging link that always works.

  4. Every sprint

    QA & security

    Automated tests, manual regression, performance budgets and an OWASP-aligned review before every release.

  5. Go-live

    Launch

    Store submissions, cloud setup, monitoring and a rollback plan — launches happen on a checklist, not on hope.

  6. Post-launch

    Support & growth

    SLA-backed maintenance, analytics reviews and a roadmap for the next release once real users arrive.

Technology

Technologies we use

Proven, well-supported tools chosen for performance, security and long-term maintainability.

  • Node.js
  • NestJS
  • Python
  • FastAPI
  • GraphQL
  • PostgreSQL
  • Redis
  • Kafka
  • Postman
Industries

API Development & Integration for your industry

Compliance, integrations and user expectations differ by sector — our teams bring that context from day one.

Engagement models

Choose how you want to work with us

Fixed-scope project

Clear scope, fixed price and milestone billing. Best for MVPs, websites and well-defined releases.

  • Milestone-based payments
  • Detailed SOW & timeline
  • Change requests priced upfront
Most popular

Dedicated team

Engineers, designers and QA who work only on your product, managed by you or by our delivery lead.

  • Monthly billing
  • Scale up or down with 2 weeks' notice
  • Daily stand-ups in your time zone

Time & material

Flexible hourly engagement for evolving products, audits, integrations and ongoing improvements.

  • Pay for hours used
  • Weekly timesheets
  • Ideal for evolving roadmaps
Client stories

What our clients say

  • ★★★★★
    “We were looking for a reliable app development company in Jaipur for our business idea, and working with Flowrush Technologies was a smooth experience. The team understood our requirements properly, helped us plan the features and kept us updated throughout the development process. The final mobile app is easy to use and performs well. We especially appreciated their communication and support.”
    Vikram SinghMobile app development
  • ★★★★★
    “Flowrush Technologies developed our business website with a clean design and smooth user experience. The website looks professional, works well on mobile, and the team supported us properly even after launch.”
    Rahul SharmaWebsite development
  • ★★★★★
    “Flowrush Technologies helped us develop an Android application for our Jaipur-based business. Their team was patient while understanding our requirements and suggested practical solutions wherever needed. The app design is clean, the functionality works smoothly and the overall experience was professional. A good choice for businesses looking for mobile app development in Jaipur.”
    Ananya GuptaApp development
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FAQ

API Development & Integration FAQs

Straight answers to the questions we hear most. Can't find yours? Email us and a senior team member will reply.

Ask a question
Do you document the APIs you build?
Yes. Every API ships with OpenAPI/Swagger documentation, example requests, Postman collections and versioning guidelines.
What happens when a third-party API fails?
We design for it — retries with back-off, dead-letter queues, idempotent processing and alerts, so failures are recovered automatically or flagged quickly.
Can you integrate with a system that has no API?
Often, yes — through database replication, secure file exchange, webhooks or, as a last resort, carefully monitored automation.
How much does a software project cost?
It depends on scope, platforms and integrations. After a short discovery call we share a written estimate with a feature-by-feature breakdown, so you can choose what goes into the first release and what waits.
Will I own the source code and IP?
Yes. All source code, designs and intellectual property are assigned to you under our agreement. We sign an NDA before discussing your idea in detail.
How do you communicate during the project?
You get a dedicated project manager, a shared task board, a weekly written report and a sprint demo every two weeks. Slack, Teams, Google Meet or Zoom — whatever your team already uses.