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Front-end development

Updated September 2026

Front-end development that ships Exactly As Designed.

Front-end development that ships Exactly As Designed.

Front-end development that ships Exactly As Designed.

Front-end development that ships Exactly As Designed.

Rango is a design-led, AI-native front-end development partner for B2B SaaS, fintech and infrastructure teams.

Rango is a design-led, AI-native front-end development partner for B2B SaaS, fintech and infrastructure teams.

Ask ChatGPT

Claude

Ask Claude

Rango builds product front-ends for B2B SaaS, fintech and infrastructure teams. React and TypeScript screens, a component library and every data state ship as One Production Codebase, in your repo. Design and front-end sit in one in-house team, so what we build matches what was designed, and we work alongside your backend engineers on their APIs.

Rango builds product front-ends for B2B SaaS, fintech and infrastructure teams. React and TypeScript screens, a component library and every data state ship as One Production Codebase, in your repo. Design and front-end sit in one in-house team, so what we build matches what was designed, and we work alongside your backend engineers on their APIs.

Rango builds product front-ends for B2B SaaS, fintech and infrastructure teams. React and TypeScript screens, a component library and every data state ship as One Production Codebase, in your repo. Design and front-end sit in one in-house team, so what we build matches what was designed, and we work alongside your backend engineers on their APIs.

Every screen ships as Typed React Components with Loading And Error States, so your users stop wondering

Every screen ships as Typed React Components with Loading And Error States, so your users stop wondering

Every screen ships as Typed React Components with Loading And Error States, so your users stop wondering

what happens when the API is slow.

what happens when the API is slow.

what happens when the API is slow.

Anish Manglani
Md Shahanab Uddin
Amit Pathania
Faizan Mahida
Shreyash Chhatbar
Divyesh Vasani
Sagar Ludhiyani

Choose between

A new build or a takeover. Same Team Throughout.

A new build or a takeover. Same Team Throughout.

Take over an existing front-end

We read your codebase first, fix the slow and fragile parts, then refactor toward typed components without pausing the roadmap or rewriting what already works.

Before and after diagram of an inherited interface being aligned to a spacing scale, with the alignment score improving

Build a new product front-end

Architecture and component structure come first, then screens in React and TypeScript, wired to your APIs and shipped through your repo and CI.

Specification of one component with default, hover, focus and disabled states, and dimension lines fixing its padding and height

Design system in code

Have a Figma library? We turn it into typed React components documented in Storybook, so every new screen reuses code instead of restyling it.

Type ramp and colour swatches joined by leader lines to their named design tokens in code

Front-end development services

Everything a product front-end needs, From Figma To Production.

Everything a product front-end needs, From Figma To Production.

Everything a product front-end needs, From Figma To Production.

01

Figma to production components

Approved designs become real components, not an engineer’s reading of a screenshot. Figma’s MCP server hands Claude and Cursor the actual components, tokens and specs, and a senior engineer reviews the diff against the design. Spacing, type and states match what was signed off.

02

React and TypeScript app UI

Screens built in React and TypeScript with strict types from the API layer up. Agents draft the repetitive views while our engineers own the architecture, the naming and every merge. You get a codebase your team can still read in six months, not a pile of generated files.

03

Component library in Storybook

Your design system becomes typed components with variants and tokens, documented in Storybook and checked with Chromatic on every pull request. Designers can see what actually shipped and engineers import by name. New screens reuse the system instead of rebuilding buttons.

04

Data states and API wiring

Loading, empty, error, partial and permission states are designed for every view, not added once QA finds them. TanStack Query handles caching and retries against your APIs. People see a considered screen when the network is slow, instead of a spinner with no end.

05

Tables and dashboards at volume

Tables, filters and charts built for real record counts, with virtualized lists, pagination and saved views. We test against production-sized data rather than a seed file. The screen stays usable at ten thousand rows, which is where most B2B interfaces quietly fall apart.

06

Accessibility, built in

Keyboard paths, focus handling and ARIA patterns are part of each component, then checked with axe in CI and reviewed by an engineer against WCAG 2.2 AA. Accessibility stops being a retrofit, and enterprise procurement reviews stop turning up surprises.

07

Performance you can measure

Bundle size and render time are profiled, heavy views load lazily, and Core Web Vitals are tracked against a budget while Sentry watches real users. Regressions surface in days rather than in a quarterly review, and you get numbers instead of an assurance that it feels fast.

08

Tests and CI in your repo

Vitest covers the logic and Playwright runs the core paths in a real browser on every pull request. Nothing an agent drafts is trusted by default: a senior engineer reviews the diff and your CI blocks the merge when something breaks.

Figma to production components

Approved designs become real components, not an engineer’s reading of a screenshot. Figma’s MCP server hands Claude and Cursor the actual components, tokens and specs, and a senior engineer reviews the diff against the design. Spacing, type and states match what was signed off.

React and TypeScript app UI

Screens built in React and TypeScript with strict types from the API layer up. Agents draft the repetitive views while our engineers own the architecture, the naming and every merge. You get a codebase your team can still read in six months, not a pile of generated files.

Component library in Storybook

Your design system becomes typed components with variants and tokens, documented in Storybook and checked with Chromatic on every pull request. Designers can see what actually shipped and engineers import by name. New screens reuse the system instead of rebuilding buttons.

Data states and API wiring

Loading, empty, error, partial and permission states are designed for every view, not added once QA finds them. TanStack Query handles caching and retries against your APIs. People see a considered screen when the network is slow, instead of a spinner with no end.

Tables and dashboards at volume

Tables, filters and charts built for real record counts, with virtualized lists, pagination and saved views. We test against production-sized data rather than a seed file. The screen stays usable at ten thousand rows, which is where most B2B interfaces quietly fall apart.

Accessibility, built in

Keyboard paths, focus handling and ARIA patterns are part of each component, then checked with axe in CI and reviewed by an engineer against WCAG 2.2 AA. Accessibility stops being a retrofit, and enterprise procurement reviews stop turning up surprises.

Performance you can measure

Bundle size and render time are profiled, heavy views load lazily, and Core Web Vitals are tracked against a budget while Sentry watches real users. Regressions surface in days rather than in a quarterly review, and you get numbers instead of an assurance that it feels fast.

Tests and CI in your repo

Vitest covers the logic and Playwright runs the core paths in a real browser on every pull request. Nothing an agent drafts is trusted by default: a senior engineer reviews the diff and your CI blocks the merge when something breaks.

AI drafts the first pass. Engineers Own Every Merge.

AI drafts the first pass. Engineers Own Every Merge.

AI drafts the first pass. Engineers Own Every Merge.

Illustration of a designer working on a laptop in a dark office at night

Reviewed code, not autopilot

Agents draft inside your lint rules, types and component library, and a senior engineer reviews every pull request before it merges. Benchmarks score agents on well-specified issues, not on your design system.

Illustration of a designer working on a laptop in a dark office at night

Reviewed code, not autopilot

Agents draft inside your lint rules, types and component library, and a senior engineer reviews every pull request before it merges. Benchmarks score agents on well-specified issues, not on your design system.

Illustration of a designer working on a laptop in a dark office at night

Reviewed code, not autopilot

Agents draft inside your lint rules, types and component library, and a senior engineer reviews every pull request before it merges. Benchmarks score agents on well-specified issues, not on your design system.

Figma to a typed component library

Approved screens become React components your team imports by name, with props that match the Figma variants, rather than screenshots to rebuild by eye.

Figma to a typed component library

Approved screens become React components your team imports by name, with props that match the Figma variants, rather than screenshots to rebuild by eye.

Figma to a typed component library

Approved screens become React components your team imports by name, with props that match the Figma variants, rather than screenshots to rebuild by eye.

Your engineers, in your Slack

Your engineers, in your Slack

Your engineers, in your Slack

The engineers writing your front-end join your Slack or Teams, so a question about an API response is answered in minutes instead of at the next standup.

The engineers writing your front-end join your Slack or Teams, so a question about an API response is answered in minutes instead of at the next standup.

The Rango team in Rango t-shirts
Illustration of a phone screen built from page layout blocks

US hours, US contracts

The engineers writing your front-end work an agreed overlap with your US day. Contracts are in USD, IP is assigned to you from the first commit, and MSAs and NDAs follow the terms US companies expect.

Illustration of a phone screen built from page layout blocks

US hours, US contracts

The engineers writing your front-end work an agreed overlap with your US day. Contracts are in USD, IP is assigned to you from the first commit, and MSAs and NDAs follow the terms US companies expect.

Illustration of a phone screen built from page layout blocks

US hours, US contracts

The engineers writing your front-end work an agreed overlap with your US day. Contracts are in USD, IP is assigned to you from the first commit, and MSAs and NDAs follow the terms US companies expect.

Illustration of a laptop on a desk at night showing a chat interface

A preview link on every PR

Every pull request gets a preview deployment, so you click through the real screen in a browser before it merges into main.

Illustration of a laptop on a desk at night showing a chat interface

A preview link on every PR

Every pull request gets a preview deployment, so you click through the real screen in a browser before it merges into main.

Illustration of a laptop on a desk at night showing a chat interface

A preview link on every PR

Every pull request gets a preview deployment, so you click through the real screen in a browser before it merges into main.

Choosing a front-end development partner

Rango

Freelance developer

Traditional agency

Choosing a front-end development partner

Rango

Freelance developer

Traditional agency

What It Costs

What It Costs

Scope and price fixed before we start.

Scope and price fixed before we start.

Hourly, and scope drifts as it goes.

Hourly, and scope drifts as it goes.

A retainer before anything ships.

A retainer before anything ships.

Time To First Release

Time To First Release

Four to six weeks for a focused module.

Four to six weeks for a focused module.

Depends on one person’s calendar.

Depends on one person’s calendar.

Months, through a fixed plan.

Months, through a fixed plan.

Who Builds It

Who Builds It

Designers and engineers in one team.

Designers and engineers in one team.

One developer, with no reviewer.

One developer, with no reviewer.

A bench you meet after signing.

A bench you meet after signing.

A Change Across Forty Screens

A Change Across Forty Screens

One component change, reviewed once.

One component change, reviewed once.

Forty edits, hoping none are missed.

Forty edits, hoping none are missed.

A change request and a quote.

A change request and a quote.

Working Hours

Working Hours

Daily overlap with your US hours.

Daily overlap with your US hours.

Whenever their schedule allows.

Whenever their schedule allows.

Business hours, one time zone.

Business hours, one time zone.

Design Fidelity

Design Fidelity

Built by the team that designed it.

Built by the team that designed it.

Close enough, measured by eye.

Close enough, measured by eye.

Their own read of your Figma file.

Their own read of your Figma file.

Where The Code Lives

Where The Code Lives

Your repo and CI, from the first commit.

Your repo and CI, from the first commit.

Their laptop, until it is pushed.

Their laptop, until it is pushed.

Their repo, handed over at the end.

Their repo, handed over at the end.

Front-ends that hold up with real data, not just in Figma.

Front-ends that hold up with real data, not just in Figma.

Front-ends that hold up with real data, not just in Figma.

We build to WCAG 2.2 AA and WAI-ARIA patterns, keep TypeScript strict end to end, and test the core paths in a real browser on every pull request before anything reaches your users.

We build to WCAG 2.2 AA and WAI-ARIA patterns, keep TypeScript strict end to end, and test the core paths in a real browser on every pull request before anything reaches your users.

  • Strict TypeScript

  • WCAG 2.2 AA accessibility

  • WAI-ARIA component patterns

  • Keyboard and focus handling

  • Empty, loading and error states

  • Role-based views

  • Typed API client

  • Storybook documentation

  • Visual regression tests

  • End-to-end tests in CI

  • Core Web Vitals budgets

  • Error and performance monitoring

  • Cross-browser testing

  • Dark mode support

Tools we use

The stack we build product front-ends with.

The stack we build product front-ends with.

The stack we build product front-ends with.

We design in Figma and pass the approved system to Claude and Cursor through Figma’s MCP server, then build in React, TypeScript and Tailwind CSS on Next.js or Vite, document components in Storybook, test with Vitest, Playwright and Chromatic, and ship through GitHub and Vercel with Sentry watching errors. Need the database and APIs as well? See full-stack development. Need a marketing site instead of a product? See B2B website design.

Claude logo

Claude

Cursor logo

Cursor

Figma logo

Figma

React logo

React

TypeScript logo

TypeScript

Next.js logo

Next.js

Vite logo

Vite

Tailwind CSS logo

Tailwind CSS

TanStack Query logo

TanStack Query

Storybook logo

Storybook

Chromatic logo

Chromatic

Vitest logo

Vitest

Playwright logo

Playwright

Sentry logo

Sentry

GitHub logo

GitHub

Vercel logo

Vercel

Engagement Models

Ways To Work With Rango.

Staff Augmentation

Front-end engineer (3 to 5 yrs)

Daily async updates, weekly live reviews

1 week trial

Fixed-Scope Build

Ideal for a new front-end, a refactor or a module

Weekly progress reviews

2-FOLD TRIAL

Monthly Partnership

Ideal for new features, components and upgrades

Asynchronous updates + fast turnarounds

8 HOUR TRIAL

The questions teams ask us before they start.

The questions teams ask us before they start.

The questions teams ask us before they start.

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Frequently asked questions

Straight Answers. No fluff.

How long does front-end development take?

Four to six weeks for a focused module or first release, from the codebase review to merged, tested code. The number of screens, how settled your APIs are and how much existing code we refactor all move that. On the scoping call we will tell you which timeline your project fits.

How much does front-end development cost?

Fixed-scope projects start at $1,500, and the final number depends on scope. What moves it: how many screens and states you need, whether we start fresh or refactor existing code, how complete the design is, and whether you want a component library in Storybook. We contract in USD.

Can you work inside our existing codebase and CI?

Yes, and we often do. We work in your repo, follow your conventions, lint rules and branching, and open pull requests your engineers review. Your CI runs our tests the same way it runs theirs.

Do you build the backend as well?

The front-end is what this page covers. We work alongside your backend team, build against the API contract they own, and use typed mocks so neither side waits on the other. If you need the backend built as well, our full-stack engineers can take on the whole feature.

Can you build from our existing Figma designs?

Yes. We build from your Figma file and your tokens, and flag missing states before we code them. If a screen still needs design, the same in-house team designs it, so you do not need a second agency.

Which stack do you build with?

React and TypeScript, with Tailwind CSS or the styling approach you already use, TanStack Query for server data, Storybook for components, and Vitest and Playwright for tests. If your product runs on Next.js or Vite, we work within it rather than switching it.

Who owns the code?

You do. Everything lives in your repo from the first commit, IP is assigned to you, and the components, tests and documentation stay with your team once the engagement ends.

How do you use AI, and does it make this cheaper?

Agents draft components, stories and tests inside your lint rules and design system, and a senior engineer reviews every pull request. Published 2026 research puts the gain at roughly 35 to 40% on new, well-specified work and under 10% on complex legacy code, and independent testing found 45% of AI-generated samples carried an OWASP Top 10 flaw. So we price on scope, not on how much of the first draft an agent wrote.

Can a US company work smoothly with a team in India?

Yes. We work in your time zone, so feedback turns around in hours rather than overnight. Contracts are in USD, IP is assigned to you, and MSAs and NDAs follow the terms US companies expect. The engineers on your front-end stay on it from the first commit to the release.

If you’re considering
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