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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 and AI companies.

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

Rango builds product front-ends for SaaS and AI companies. 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 SaaS and AI companies. 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 SaaS and AI companies. 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.

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 is built in from the first component, not retrofitted the week before a procurement review.

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 is built in from the first component, not retrofitted the week before a procurement review.

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. DORA’s 2026 research puts the gain at 35 to 40% on simple new work and 10% or less on complex legacy code.

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. DORA’s 2026 research puts the gain at 35 to 40% on simple new work and 10% or less on complex legacy code.

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. DORA’s 2026 research puts the gain at 35 to 40% on simple new work and 10% or less on complex legacy code.

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 gets settled during agreed overlap hours, not at the next standup.

The engineers writing your front-end join your Slack or Teams, so a question about an API response gets settled during agreed overlap hours, not 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, 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, 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, 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

Pricing

Pricing

Fixed price for an agreed scope.

Fixed price for an agreed scope.

Usually hourly or per task.

Usually hourly or per task.

Usually a project fee or a retainer.

Usually a project fee or a retainer.

Review Process

Review Process

A senior engineer reviews every pull request.

A senior engineer reviews every pull request.

Often self-reviewed, unless you add a reviewer.

Often self-reviewed, unless you add a reviewer.

Set by the agency’s own process.

Set by the agency’s own process.

Who Builds It

Who Builds It

Designers and engineers in one team.

Designers and engineers in one team.

Usually one developer.

Usually one developer.

A mixed team, set up differently by each agency.

A mixed team, set up differently by each agency.

Testing

Testing

Unit, visual and browser tests in CI.

Unit, visual and browser tests in CI.

Depends on the individual.

Depends on the individual.

Varies by agency and project.

Varies by agency and project.

Time Zone Overlap

Time Zone Overlap

Agreed overlap with your US hours.

Agreed overlap with your US hours.

Depends on the individual.

Depends on the individual.

Usually the agency’s local hours.

Usually the agency’s local hours.

Design Fidelity

Design Fidelity

Built by the team that designed it.

Built by the team that designed it.

Built from your design files.

Built from your design files.

Depends on whether design is in-house.

Depends on whether design is in-house.

Code Ownership

Code Ownership

Your repo and CI throughout.

Your repo and CI throughout.

Agree repo access and IP up front.

Agree repo access and IP up front.

Often transferred at handoff.

Often transferred at handoff.

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 agree the exact setup for your product and stack in the scope.

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 agree the exact setup for your product and stack in the scope.

  • 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.

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

Frequently asked questions

Straight Answers. No fluff.

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?

Focused front-end engagements, such as a single module or a component set, start at $1,500. Product builds and ongoing front-end work are scoped separately, and the price is fixed for the agreed 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. The time saved is real on simple, well-specified work and small on complex legacy code: Stanford research cited in DORA’s 2026 ROI report puts it at 35 to 40% versus 10% or less, and Veracode’s 2026 testing found OWASP Top 10 flaws in 45% of AI-generated code. So we price on scope, not on how much of the first draft an agent wrote.

Can a US company work smoothly with a remote team?

Yes. Rango is remote-first, and our process is built so it feels like a team sitting next to you. We agree overlap hours with your US workday before work starts, share progress in your Slack and project board as the work happens, and keep every file and decision open to you, so feedback turns around in hours, not overnight. Contracts are in USD, IP is assigned to you, and MSAs and NDAs follow US terms. You work directly with the designers and engineers building your front-end.

If you’re considering
Working Together

If you’re considering
Working Together

If you’re considering
Working Together