Web application developer for portals, dashboards and internal tools your team will actually use
I build custom web applications: client portals, dashboards, booking systems, calculators and internal tools that run in the browser on any device. I work with Next.js, React, TypeScript and Node.js, use AI coding tools under my direction, and review and test every change myself. You receive the source code, a staging link at each stage, written handover notes and accounts that you own.
What you get
- Application
- the working web app for the agreed scope, running on hosting in your name.
- Source code
- a repository in your account with a readable history of changes.
- Roles and permissions
- a written table of who can see and change what, backed by tests.
- Admin screens
- tools for your team to manage users, records and content without a developer.
- Integrations
- payments, e-mail, WhatsApp or CRM connections, with logging and retries.
- Test suite
- automated rule tests and end-to-end checks for the main journeys.
- Handover pack
- deployment notes, settings list, backup notes and a recorded walkthrough.
- After-launch support
- 30 days of fixes, with an optional monthly plan after that.
What a web application is, and when you need one
A website shows information to everyone who visits. A web application remembers who you are, stores your data and follows rules: a client logs in and sees only their own invoices, a patient picks a free slot and the slot disappears for the next person, a sales manager opens a dashboard that is built from live numbers instead of a spreadsheet someone e-mailed on Monday. If your idea involves logins, records that change, calculations or approvals, you are describing an application.
Not every project needs one, and I say so early. A brochure site, a single landing page or a standard shop is cheaper and safer on a ready-made platform. I recommend custom code only when the workflow is specific to your business, when the off-the-shelf tools force you into workarounds, or when you need the data and the rules to belong to you.
The kinds of applications I build
Most of my application work falls into a few shapes. Knowing which one yours resembles lets me reuse patterns that already work instead of inventing a structure from nothing.
- Client and customer portals: secure login, documents, status tracking, messages and invoices for each account.
- Booking and scheduling: availability rules, buffers, time zones, confirmations, reminders by e-mail or WhatsApp and a calendar view for staff.
- Dashboards and reporting: charts and tables fed from your database, ad platforms or analytics, with filters, exports and role-based views.
- Internal tools: lead trackers, approval flows, inventory lists, quote and estimate calculators that replace spreadsheets and chat threads.
- Admin consoles: the screen your team uses to edit content, manage users, refund, resend or correct a record without calling a developer.
- Integrations: payments, e-mail, WhatsApp, calendars and CRMs connected through their official APIs, with failures logged and retried.
How I build: AI-assisted development with a human reading every line
I am a computer science engineer who builds with AI coding tools such as Claude, Codex, ChatGPT and Cursor. I decide the requirements, the data model and the screens, direct the tools to write the code in small steps, and then read what they produced, run it and test it. The speed is real: a working first version often takes days, not months. The risk is also real, because AI can write code that looks right and is wrong, so nothing reaches you without my review and a test that proves the behaviour.
The same method built the platforms I can point to: a Node.js system that runs 20 or more AI agents as background services with a custom CRM and e-mail and WhatsApp automation, and production Next.js sites including this one. I know where the method is strong and where it needs a slower, more careful hand, such as payments, permissions and data migration.
Security and who can see what
The first question for any application with logins is whether one user can see another user's data. I design for that from the first screen. Every request is checked on the server, never only in the browser: who is asking, what role they have and which records belong to them. Passwords are never stored in plain text, sessions expire, forms reject malformed input, and secrets such as API keys live in environment settings rather than in the code.
I add tests for the dangerous cases on purpose: a normal user trying to open an admin address, one client trying to fetch another client's record by changing a number in the link, and a request with no login at all. Dependencies are kept current, personal data is kept out of logs, and I explain in plain words what data you hold, because laws such as GDPR, UK GDPR, CCPA and India's DPDP Act 2023 may apply to your users. I am not a lawyer, so I flag the questions for yours.
Testing before you ever see it
Each feature arrives with its own automated test for the business rule behind it, such as how a booking clashes with another, how a discount is calculated or who may cancel an order. The main journeys are also clicked through end to end in a real browser, so a change made next month cannot silently break the form that brings you customers.
Screens are checked at phone, tablet and laptop widths with real data rather than empty states, for readable contrast, visible keyboard focus and sensible error messages. I use test accounts and made-up records only, never your real customers, until you decide to go live.
Hosting, ownership and handover
The code lives in a repository under your account, and the application runs on hosting in your name, whether that is a managed platform or a server you control. You get written notes on how to deploy, where the settings live, how backups run and what to do if something fails, plus a recorded walkthrough of the admin screens.
After launch I stay on for 30 days of fixes. Beyond that, a small monthly retainer can cover updates, security patches and new features, or your own developers can take over using the notes. Either way you are never locked in to me.
How the work runs
- 01
Scope the workflow
A call and a short written brief: who uses the application, what they do in it, which data it holds and what a successful first version looks like.
- 02
Map data and permissions
A plain diagram of the records, the roles and who may see or change what, agreed with you before any code is written.
- 03
Design the screens
Phone-first screens for the main journeys, reviewed with you as clickable pages on a staging link.
- 04
Build in small releases
Working slices every few days, each with its tests, so you try real features early instead of waiting for a finished product.
- 05
Test and harden
Rule tests, end-to-end checks, role and cross-user checks, device and accessibility checks, and a review of every integration.
- 06
Launch and hand over
Production setup, data import, monitoring, a recorded walkthrough, written notes and 30 days of fixes.
Tools and proof
- Tools
- Next.js, React, TypeScript, Node.js, Tailwind CSS, SQL and MongoDB, Claude, Codex and Cursor
- Experience
- 12+ years of digital work and a Computer Science and Engineering M.Tech, now building software with AI-assisted engineering.
- Built end to end
- A Node.js platform running 20+ AI agents as background services, with a custom CRM and e-mail and WhatsApp automation.
- Production Next.js sites
- Websites and web applications, including this site, built and tested with agentic AI.
- Measured by results
- $400K+ a month of ad spend managed across 500+ brands, so applications are built around conversion and tracking.
Questions about web application development
A focused first version with logins, a few core screens and one or two integrations commonly takes four to eight weeks, depending on how fast decisions and content arrive. Larger systems are planned in stages, and I give a schedule with the quote.
Both, honestly: I direct AI coding tools to write the code in small steps, then I read, run and test every change. That is faster than typing everything by hand, and the review and tests are what keep it reliable.
You do. The repository, the database, the hosting account and the domain are in your name, and I hand over access and written notes at the end. There is no licence fee to me.
Often yes. I start with a short review of the code, the data and the tests to see what is safe to extend, then tell you plainly whether to add to it, repair it first or rebuild parts of it.
Every request is checked on the server for the user, the role and the record's owner, and I write tests that deliberately try to cross those lines. Hiding a button in the screen is never treated as security.
Usually Next.js, React, TypeScript and Node.js with a SQL database, because they are widely known and easy for another developer to take over. If your team already uses a different stack, I will work in that instead.
Yes. I work remotely from India with clients in the USA, UK, UAE, Australia and elsewhere, with video calls at times that suit you, a shared board, staging links at every stage and same-working-day replies.
Web application developer by country and city
- Web application developer in AhmedabadAhmedabad firms usually pay by NEFT, RTGS or cheque against a GST invoice, with UPI for smaller sums. Traders and manufacturers pay close attention to the GSTIN and invoice format, and some deduct TDS before paying a professional fee, so I suggest agreeing these points in the quote.
- Web application developer in BangaloreBangalore companies usually pay by bank transfer (NEFT or RTGS) against a GST invoice, and funded start-ups often follow a purchase-order or vendor-onboarding process with TDS deducted at source. It saves time to confirm the invoice details and payment schedule in writing at the start.
- Web application developer in ChennaiChennai firms typically pay professional fees by NEFT or RTGS, and UPI for smaller amounts. Manufacturers and exporters expect a GST invoice with the supplier's GSTIN, and some deduct TDS at source, so invoicing details are best agreed in the written quote.
- Web application developer in DelhiDelhi businesses typically pay professionals by bank transfer (NEFT or RTGS) and use UPI for smaller sums. Traders and companies expect a GST invoice with the supplier's GSTIN, and some deduct TDS before paying a technical or professional fee, so those details are best settled in the quote.
- Web application developer in GurgaonGurgaon companies, especially larger corporates, usually pay professional fees by NEFT or RTGS after vendor onboarding, against a GST invoice with the supplier's GSTIN. TDS is commonly deducted at source and payment follows an agreed credit period, so these terms are best written into the quote.
- Web application developer in HyderabadHyderabad companies mostly pay professional fees by NEFT or RTGS, with UPI for small amounts. IT and pharma buyers usually expect a GST invoice and a vendor form, and many deduct TDS before payment, so I suggest agreeing these details at the quote stage.
- Web application developer in KolkataKolkata businesses mostly pay by NEFT, RTGS or cheque to a bank account, with UPI for smaller sums. Traders and companies expect a GST invoice with the supplier's GSTIN, and some deduct TDS, so I suggest settling invoicing details in the quote.
- Web application developer in MumbaiMumbai companies commonly settle professional fees by NEFT or RTGS to a bank account, with UPI used for smaller amounts. Registered businesses expect a GST invoice, and many corporate and financial-services clients deduct TDS before paying, so it helps to agree the invoicing details in the quote.
- Web application developer in NoidaNoida firms usually pay professional fees by NEFT or RTGS, and by UPI for smaller amounts, against a GST invoice. Companies with vendor processes may pay after a credit period and deduct TDS, so the invoicing terms are best written into the quote.
- Web application developer in PunePune businesses commonly pay by NEFT or RTGS against a GST invoice, and manufacturing and IT buyers often work through a vendor registration and purchase order, with TDS deducted at source. Agreeing the invoice details and the payment schedule in the quote avoids delays later.
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Need web application development?
Tell me the goal and the market; you get a plain answer and a fixed quote, usually within one working day.
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