Mumbai · based in Vashi
Freelance React developer in Mumbai.
I'm Sumit Kumar, a freelance React and Next.js developer based in Vashi, Navi Mumbai, working with Mumbai businesses and product teams. I build fast, SEO-friendly websites, turn Figma designs into React, and fix slow React apps. React or Next.js screens start at ₹1,200 each. We can meet in person in Mumbai or on Google Meet.
- React or Next.js screens
- from ₹1,200 per screen
- Figma to React
- Responsive, reusable components
- Backend too
- Node.js, Express, MongoDB
- Meetings
- In person in Mumbai, or Google Meet
01 — Mumbai
React work for Mumbai teams
Some clients need a complete frontend; others need help with one slow or broken part of an existing app. I do both, working remotely with in-person meetings when they help.
For businesses that sell or get leads online, I usually recommend Next.js, so pages load fast and Google can read them.
02 — Live work
Client work you can open right now
D2C fashion e-commerce
Ferrea Fashion
Online store with catalogue, cart, Razorpay payments, Shiprocket shipping, media on AWS S3 and an admin panel for products and orders.
- React
- Node.js
- Express
- MongoDB
- Razorpay
- Shiprocket
- AWS S3
Recruitment platform
Panvel Placement
Started as a static website and grew into a job portal: job listings, candidate applications and dashboards, and admin tools for the placement team.
- HTML
- CSS
- JavaScript
- Node.js
- MongoDB
Business website with admin panel
Multishift Packers and Movers
Company website with service and area pages built for local search, a blog, and an admin panel for quotations and consignment tracking.
- HTML
- CSS
- JavaScript
- PayU
03 — What I build
What I can build for you
Next.js websites that rank
Server-rendered pages with clean metadata, sitemaps and structured data.
Figma to React
Designs turned into responsive, reusable components.
Performance fixes
Slow load times, heavy bundles and layout shifts in existing React apps.
Frontends for your API
React interfaces wired to an existing backend.
04 — Pricing
Starting prices
React or Next.js website
Starting at
₹1,200 per screen
Per screen, responsive, from your Figma design or brief
Performance audit and fixes
Price
Quoted
For an existing React or Next.js app
Cost depends on the number of pages or screens, whether a design already exists, animations and interactions, and how much of an existing app has to change. You get a written quote before any work starts.
05 — Included
What every project includes
- A written scope, timeline and price agreed before any work starts
- Progress on a live preview link you can open at any time
- Mobile-first pages that load fast on Indian mobile networks
- SEO set up from the start: titles, descriptions, sitemap and structured data
- Google Search Console connected at launch
- Domain, hosting and code in your name at handover
06 — Process
How a project runs
Step 1: Read before writing
For an existing app I learn its structure first; for a new one, the design and API.
Step 2: Components you can maintain
Small, reusable components another developer can pick up.
Step 3: Measure speed
Load time and Core Web Vitals checked before and after.
Step 4: Hand over cleanly
Work merged into your repo the way your team already works.
07 — Clients
What clients say
We came to Sumit with a fairly complex e-commerce setup in mind — payments, shipping, the works. He got it all working smoothly and was quick to fix anything we flagged after launch.
Veer Pratap Rana · CEO, Ferrea Films Pvt. Ltd. What started as a simple website grew into a full platform as our needs changed, and Sumit kept up with every request. Reliable, responsive, and easy to work with.
Akshay Koli · Founder, Panvel Placement
08 — Guides
Read before you hire anyone
Website speed
Why is my website slow, and how do I get a 90+ PageSpeed score?
8 min read
Choosing a platform
Next.js vs WordPress for a small business website
7 min read
SEO, AEO and GEO
AEO vs GEO vs SEO: what is the difference?
8 min read
Google and SEO
Why is my website not showing on Google, and how do I fix it?
8 min read
Website cost
How much does a website cost in India in 2026?
8 min read
09 — FAQ
Questions clients ask
Do you work on-site in Mumbai?
Work is remote, with in-person meetings in Mumbai for kickoff or reviews when useful.
Can you fix a slow React website?
Usually, yes. I measure first, then fix the biggest causes, which are often large images, heavy bundles and client-side rendering of pages that should be server-rendered.
Do you work with Next.js?
Yes. This website is built with Next.js, and it's what I recommend for any site that needs to rank on Google.
How much does a freelance React or Next.js developer cost?
React or Next.js website: from ₹1,200 per screen. Performance audit and fixes: quoted after a call. Cost depends on the number of pages or screens, whether a design already exists, animations and interactions, and how much of an existing app has to change.