Custom Web App Development Company · India & USA

Build a Web Application Around Your Business, Not Around a Template

From SaaS products and customer portals to enterprise platforms, CRM/ERP systems and AI-powered applications, D2i Technology designs, develops, tests and supports custom web applications built around how your business actually works.

What we build

  • SaaS platforms Multi-tenant, subscription-ready products
  • Customer and partner portals Secure self-service for the people you work with
  • Enterprise and internal platforms Replace spreadsheets with one source of truth
  • CRM and ERP systems Sales, inventory, HR and finance in one place
  • Marketplaces Multi-vendor onboarding, payments and search
  • AI-powered applications Automation, document processing and recommendations
  • 85+ Web apps delivered
  • 17+ Years of engineering experience
  • ISO 27001 Certified information security
  • ISO 9001 Certified quality management
  • India + USA Global delivery

What Are You Looking to Build?

Pick the one closest to your project and see how we would approach it.

Build a scalable SaaS platform with subscriptions, multi-tenancy and integrations.

Give customers, partners or vendors a secure place to manage information, transactions and workflows.

Replace spreadsheets and disconnected systems with a centralized application.

Build multi-vendor platforms with onboarding, payments, search, reviews and workflows.

Add AI agents, automation, recommendations, document processing or intelligent workflows.

Improve performance, architecture, UX, security or maintainability without rebuilding everything.

Not sure which one fits your project? Talk to an expert and get a clear recommendation.

Speak to an Expert

Building: SaaS Product

What this usually includes

  • Multi-tenant architecture and role-based access
  • Subscription billing and payment gateways
  • Admin dashboards, analytics and audit trails
  • APIs and third-party integrations

A good first step

A discovery workshop to agree the MVP scope, tenancy model and billing approach before any code is written.

Discuss your SaaS product

Building: Customer / Partner Portal

What this usually includes

  • Secure sign-in, SSO and permissions by role
  • Self-service requests, documents and approvals
  • Integration with your CRM, ERP or billing system
  • Notifications, reporting and activity history

A good first step

Map who uses the portal, what they need to do without calling you, and which systems hold the data.

Discuss your portal

Building: Internal Business Platform

What this usually includes

  • Workflow automation and approval chains
  • Role-based access with audit trails
  • Dashboards and reporting across teams
  • Integration with the systems you already run

A good first step

Walk through the current spreadsheets and handoffs to find the workflows that cost the most time.

Discuss your internal platform

Building: Marketplace

What this usually includes

  • Buyer and seller onboarding
  • Payment split and payouts
  • Advanced search, ratings and reviews
  • Admin tools for moderation and disputes

A good first step

Define the supply and demand sides, the revenue model and what must work on day one.

Discuss your marketplace

Building: AI-Powered Application

What this usually includes

  • AI agents and chat interfaces
  • Document and data extraction pipelines
  • Recommendations and predictive dashboards
  • Human review steps where accuracy matters

A good first step

Pick one workflow where AI measurably helps and prove it with a small, testable prototype.

Discuss your AI application

Building: Existing Application Needs Modernization

What this usually includes

  • Architecture and code review
  • Incremental upgrade path with no data loss
  • Performance, security and accessibility fixes
  • Automated tests to make future changes safe

A good first step

A technical assessment of what is slowing you down, so you can decide what to fix and what to leave alone.

Discuss modernization

Types of Web Applications We Build

End-to-end custom web application development, from first prototype to production support

SaaS Applications

Launch a Software-as-a-Service product built to handle thousands of concurrent users.

  • Multi-tenancy
  • Subscription billing
  • Cloud-native

Enterprise Web Apps

Secure applications with workflow automation that fit into your existing IT ecosystem.

  • Role-based access
  • Audit trails
  • Integrations

CRM / ERP Systems

Centralize your sales pipeline, inventory, HR and finance in a single source of truth.

  • Sales pipeline
  • Inventory
  • Finance and HR

Marketplace Platforms

Multi-vendor platforms for B2B, B2C or peer-to-peer business models.

  • Seller onboarding
  • Payment split
  • Search and reviews

AI and Automation Apps

Applications powered by AI, ML and intelligent automation.

  • Chatbots
  • Data extraction
  • Predictive dashboards

Legacy Modernization

Upgrade outdated systems without disrupting operations or losing data.

  • Zero data loss
  • Phased migration
  • Cleaner architecture

Portals and Dashboards

Customer, partner and vendor portals with reporting your teams will actually use.

  • Self-service
  • Live reporting
  • SSO

Industry Platforms

Healthcare, e-learning, fintech, logistics and booking systems built around domain rules.

  • Healthcare
  • E-learning
  • Booking and logistics

Built for Real Business Problems

Real engagements, real outcomes. Every result below comes from a documented client case study.

Custom Web Application · Marketplace Development

Building a CA Services Marketplace for MyTaxProf

MyTaxProf set out to connect clients with Chartered Accountant (CA) firms through one digital platform. D2i Technology built a custom, multi-role CA services marketplace covering service discovery, firm onboarding and verification, and structured service requests.

Read Full Case Study of Building a CA Services Marketplace for MyTaxProf
Website Redesign · UX/UI

Website Redesign at New Life Agency

New Life Agency needed a modern, professional website that truly reflected their reputation. D2i Technology redesigned their digital presence from the ground up — delivering a faster, more intuitive, and fully responsive experience built to support their continued growth.

Read Full Case Study of Website Redesign at New Life Agency
Marketplace Platform Scaling · DevOps & Cloud

DevOps Transformation at ZiffyCar

ZiffyCar's peer-to-peer car rental marketplace was expanding fast — 50+ cities, thousands of hosts, and booking traffic that spiked hard every weekend. D2i Technology built the DevOps foundation to match that growth, turning a fragmented, contractor-heavy delivery model into a streamlined pipeline that achieved 10× faster releases and a 40% reduction in DevOps spend.

Read Full Case Study of DevOps Transformation at ZiffyCar

Why Businesses Choose Custom Web Applications

A custom web application is built around your workflows, not generic off-the-shelf software. As a Custom Web App Development Company in India, we build for clients across the USA, UK, Australia and beyond.

Fit your workflow

No forcing your business into someone else's process.

Integrate your systems

APIs, CRM, ERP, payment gateways and third-party platforms.

Scale as you grow

Architecture designed around expected users, data and complexity.

Own your product

Your application, your workflows, your data and your roadmap.

Accessible from the start

WCAG accessibility is part of design, development and QA, not an afterthought.

When Does Custom Development Make Sense?

Custom is not always the answer. Here is how we would think about it.

When to choose custom development versus other approaches
If you need... Consider...
Standard business functionality Off-the-shelf software
Unique workflows Custom application
Multiple systems connected Custom application with integrations
A SaaS product Custom SaaS platform
AI built into a core workflow AI-native custom application
An existing legacy system Modernization

From Idea to Production

A proven 6-stage process that turns your vision into a production-ready web application

  1. Step 01

    Discover

    Understand your users, business goals, workflows and technical constraints.

  2. Step 02

    Design

    UX, UI, architecture and clickable prototypes.

  3. Step 03

    Build

    Agile development with code reviews and continuous integration.

  4. Step 04

    Test

    Functional QA, automation, performance, security and accessibility.

  5. Step 05

    Launch

    Cloud infrastructure, CI/CD and production deployment.

  6. Step 06

    Improve

    Monitoring, maintenance, optimization and new features.

What Happens After You Contact D2i?

No big commitment up front. Here is what the first few weeks look like.

  1. Step 1: 30-minute discovery call

    We listen to what you are trying to build.

  2. Step 2: Requirements and feasibility

    We confirm scope, risks and technical fit.

  3. Step 3: Solution proposal

    Approach, team and estimate in writing.

  4. Step 4: Development plan

    Milestones, sprints and who does what.

  5. Step 5: Start building

    Your team is onboarded and sprint one begins.

We Don't Stop at Writing Code

Your application ships ready for real users, real traffic and real scrutiny.

Fast

Performance engineering and optimized architecture keep pages and queries quick under load.

Secure

Security-conscious architecture and secure development practices, backed by ISO 27001 certified processes.

Accessible

WCAG-focused design, development and testing so everyone can use what you build.

Tested

Manual QA, test automation and performance testing on every release.

Scalable

Cloud and infrastructure designed around the growth you expect.

Maintainable

Clean architecture, documentation and ongoing support so the product stays healthy.

Accessibility by design

Accessibility Built Into Your Web Application

Accessibility shouldn't be a remediation project six months after launch. We make it part of every stage, with certified accessibility specialists working alongside your developers.

  1. Design

    Accessible patterns, color contrast and focus order from the first wireframe.

  2. Development

    Semantic HTML, ARIA where needed and full keyboard support.

  3. Testing

    Manual and automated testing, including screen readers.

  4. Remediation

    Clear, prioritized fixes for every issue found.

  5. Retesting

    Verification that fixes hold before release.

  • WCAG 2.1 / 2.2
  • ADA
  • Section 508
  • EAA (where applicable)
  • JAWS
  • NVDA
  • Keyboard testing
  • Screen readers
  • Manual + automated
See Our Accessibility Services

Technology That Fits the Product

We choose technology based on the product, not because it's our favorite framework.

Frontend

  • React
  • Angular
  • Vue.js
  • Next.js

Backend

  • Node.js
  • Laravel
  • Python
  • Java

Database

  • PostgreSQL
  • MySQL
  • MongoDB
  • Redis

Cloud and Infrastructure

  • AWS
  • Azure
  • Docker
  • Kubernetes
  • CI/CD

AI and Automation

  • OpenAI API
  • LangChain
  • TensorFlow
  • Custom ML models

Not Sure Where to Start?

Tell us where you are and what you need. We will suggest a starting point.

What stage are you at?
What do you need help with?

Select all that apply.

You're probably looking for

Choose a stage to see our suggestion

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Discuss This With an Expert

How Can We Work Together?

Whether you need a full product team or expert web app developers from India to extend your own, we match the engagement to your situation.

Build My Product

End-to-end discovery, design, development, QA and deployment.

Best for: Startups and businesses building a new application.

Extend My Engineering Team

Dedicated developers, QA, DevOps and architects who work inside your process.

Best for: Companies that already have a product or team.

Modernize My Existing Application

Improve architecture, performance, UX, accessibility or maintainability.

Best for: Businesses with an application that is hard to change or slow to run.

Choose How You Pay

Dedicated Team

Monthly retainer for long-term or ongoing product development with predictable billing.

  • Full-time dedicated developers
  • Daily standups and sprint planning
  • Maximum cost efficiency

Fixed-Price Project

For well-defined projects. Agree on price, timeline and milestones up front.

  • Clear scope and milestones
  • Fixed budget, no surprises
  • Defined delivery dates

Flexible Hourly

Pay only for hours worked. Best for short sprints, feature additions or on-demand expertise.

  • No long-term commitment
  • Transparent time tracking
  • Scale up or down any time

Why Companies Work With D2i

Our teams do not just write code, they take responsibility for the outcome.

Engineering, QA and Accessibility Under One Roof

Not just development. Testing and accessibility specialists work with your engineers from the start.

One Accountable Partner

Design, development, QA, DevOps and accessibility from a single team.

Transparent Delivery

Sprint demos, Jira and Slack visibility and regular reporting. No black boxes.

Security and Quality

ISO 27001 and ISO 9001 certified processes behind every engagement.

Global Delivery

India-based engineering with experience serving clients across the USA and beyond, at up to 60% lower delivery cost.

Long-Term Partnership

SLA-backed support and maintenance after launch. We do not disappear after go-live.

What Clients Say

In recognition of exceptional performance, dedication, hard work, passion, and commitment to excellence — D2i Technology’s invaluable contribution continues to make a significant impact in support of our All Hazards, One Health, One Nature mission.

Verify Certificate

Allison A. Sakara

Co-Founder & Executive Director, High Alert Institute

Their DevOps Services in USA helped us significantly reduce deployment time and infrastructure costs. D2i Technology streamlined our CI/CD pipelines and improved system stability. The results were visible within weeks, and their DevOps expertise truly made a difference.

DevOps Services & Solutions (USA)

D2i Technology is a highly dependable Web Development Company in India. From requirement gathering to final delivery, their team demonstrated strong technical expertise and ownership. The final product was robust, user-friendly, and built exactly as envisioned.

Web Development Company (India)

Frequently Asked Questions

The questions we hear most before a project starts.

Have an Application in Mind?

Tell us what you're trying to build, improve or scale. We'll help you understand the right technical approach, team and next steps.

No obligation. Start with a 30-minute discovery conversation.