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Quanvier
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Web Application Development Company · Serving US clients

Web app development for US startups and growing teams.

SaaS platforms, customer portals, dashboards and internal tools — designed and engineered by one senior team, with a written scope and estimate before you commit.

  • React / Next.js + Node.js, TypeScript end to end
  • Clickable prototype before engineering — see it before you pay for it
  • Demo every two weeks; calls in US hours
  • You own 100% of the code, designs and cloud accounts
  • NDA before the first call
  • You own the code & IP
  • Calls in US hours
  • Written scope before you commit
Get a free web app estimate
Step 1 / 3

What do you need?

What do you need?
Where are you today?

No spam, no sales sequence. A product lead replies within one business day.

Show, don't tell

Web apps we've designed and built as concepts

Real interface work, drawn as working UI. These are concept products — labelled honestly — so you can judge our design and engineering before you talk to us.

Concept products · demo data · not client work
What we build

Whatever kind of web app, built properly.

SaaS platforms

Multi-tenant products with Stripe billing, onboarding, roles, SSO and an internal admin.

Customer portals

Self-service accounts, documents, payments and support for your customers.

Dashboards & internal tools

Replace spreadsheets with live data, workflows and approvals.

Marketplaces

Two-sided platforms with search, messaging, payments and payouts.

AI-powered apps

Copilots, agents and document AI grounded in your data, with human approval.

Modernization

Rebuild legacy apps incrementally without stopping the business.

Why teams choose us

What you get that a typical vendor doesn't promise.

We write these into every proposal, so you can hold us to them.

What mattersTypical outsourcing shopFreelancersUs
Senior engineers & designers on your projectVariesVariesYes
Clickable prototype before engineering startsRarelyVariesYes
Working build you can test every two weeksOftenVariesYes
Code, designs and accounts in your name from day oneVariesVariesYes
Product thinking — we'll tell you what to cutRarelyVariesYes
Design, mobile, web, backend and AI under one roofOftenRarelyYes
Pricing, honestly

What actually drives cost.

Any agency quoting a price before understanding these is guessing. Tell us about your project and we'll send a written scope with a cost range for a first version.

Get my estimate
01

User roles & permissions

One user type vs. tenants, admins, managers and external users.

02

Integrations

Stripe, CRMs, ERPs, data warehouses and legacy APIs each add effort.

03

Data complexity

Simple CRUD vs. reporting, search, imports and audit trails.

04

Real-time features

Live updates, collaboration and notifications.

05

Compliance

SOC 2-ready practices, HIPAA or audit requirements.

06

Design depth

Solid UI kit vs. a fully custom design system.

How it works

From first call to launch.

  1. 01

    Discovery

    Goals, users, workflows, data and risks.

    → Scope & estimate
  2. 02

    UX & prototype

    Flows and clickable prototype, tested.

    → Figma prototype
  3. 03

    Build

    Two-week sprints with preview deployments.

    → Working app every sprint
  4. 04

    QA & launch

    Automated tests, security review, go-live.

    → Production release
  5. 05

    Scale

    Monitoring, performance and roadmap.

    → Monthly improvements

A small senior team — product lead, designer, engineers and QA — stays on your project from discovery to launch. No hand-offs between a sales team and a delivery team.

Frontend
ReactNext.jsTypeScriptTailwind CSS
Backend
Node.jsNestJSPythonPostgreSQLRedis
Cloud
AWSVercelDockerGitHub Actions
Services
StripeAuth0 / ClerkOpenAI / AnthropicSegment
FAQ

Questions US teams ask first.

How much does a web app cost?

It depends mostly on roles, integrations, data complexity and compliance (see “What drives cost” above). After a 30-minute call we send a written scope with a cost range for a first version — and tell you what to cut if the budget is tight.

How long does it take?

We'll give you a timeline for your scope in the estimate. You'll see a working build every two weeks on a preview link.

Can you take over an existing codebase?

Yes. We start with a short code and architecture audit, then stabilise and improve it while shipping features.

You're based in India. How does that work with a US team?

We schedule a daily overlap window in US hours (morning ET / early PT) for calls and standups, and work asynchronously the rest of the day — so you wake up to progress. You get a shared board, a weekly written update and a demo every two weeks.

Who owns the code and IP?

You do. IP is assigned to you in the contract, the code lives in your GitHub, and infrastructure is created in your cloud and store accounts from day one.

Will you sign an NDA?

Yes — before you share anything sensitive. Just ask on the first call.

How do contracts and payments work?

Discovery is a small fixed-scope engagement. The build is either fixed scope with milestone payments or a monthly team. Invoices are in USD.

Are the apps on this page your client work?

No. They're concept products our team designed and built as UI to show how we think. We label them clearly, and we don't publish client names or numbers without permission.

Have a web app in mind? Get a written estimate.

Three quick steps. A product lead reviews it personally and replies within one business day with questions, an approach and next steps.

  • NDA before the first call
  • You own the code & IP
  • Calls in US hours
  • Written scope before you commit
Get a free web app estimate
Step 1 / 3

What do you need?

What do you need?
Where are you today?

No spam, no sales sequence. A product lead replies within one business day.

Call +91 78508 49077Chat with us on WhatsApp