We buildwebsites, online stores, mobile apps, ERP & CRM systems, HR & payroll software
We build the software your business runs on — live in weeks, not quarters.
Websites that bring in enquiries, online stores, mobile apps and the systems that replace your spreadsheets and paper registers. Fixed prices, a demo every week, and you own the code.
- You own the code
- Fixed price, paid by milestone
- NDA on request
- Clients in India and abroad · INR or USD
- 4
- Live products
- 48h
- Free design
- React
- Spring Boot
- Java 21
- PostgreSQL
- AWS
- Razorpay
- Stripe
- UPI
- Tailwind CSS
- Vite
- PWA
- Flyway
- Google Maps
- JWT
- WebSockets
What we build for you
Websites, stores, apps and business software — built to bring you business
- 01 · WebsitesBusiness websitesA fast, modern website that makes your business look as good as it is — and turns visitors into calls.From ₹45,000 · $9001–2 weeks
- 02 · E-commerceOnline stores and marketplacesSell online on your own terms — your own store, or a marketplace where many sellers sell through you.From ₹2,50,000 · $3,5003–6 weeks
- 03 · Business softwareCustom business softwareThe ERP, CRM or HR system that fits how your business already works — instead of bending to software that doesn't.From ₹5,00,000 · $7,0004–8 weeks
- 04 · AppsMobile appsAn app your customers or your team install on their phone — Android, iPhone, or both from one build.From ₹4,00,000 · $5,5004–8 weeks
- 05 · RescueProject rescue and takeoverA half-built app, a vanished developer, a system nobody dares touch — we take it over and get it working.From ₹25,000 · $400Audit in 3 days
- 06 · SupportMaintenance and supportYour software kept fast, secure and up to date — with a team that answers when something goes wrong.From ₹20,000 / month · $350 / monthStarts the week you sign up
Running today
And they work on the phone people actually carry
Read the case studiesNot mockups. 4 running sites, at addresses you can open — and the same software on the handset a shopkeeper or a site engineer is holding, because that is where most of it gets used.
How a project runs
From a WhatsApp message to live software — with no surprises on the way
- 11 day
Talk
A WhatsApp message or a 30-minute call. You tell us what the business does and what is hurting; we ask questions.
- 248 hours
Free design
We send back clickable screens of the most important part — so you see your idea working before you pay anything.
- 31–2 days
Fixed quote
A written scope, a fixed price and a timeline, broken into milestones. No hourly meter running.
- 4Weekly demos
Build, in two-week steps
Every week you see working software on a link you can open. Change your mind early, when it is cheap.
- 5Go live
Launch
We deploy it, move your data across, train your team and stay on hand for the first days.
- 630 days free
Support
Any defect found in the first 30 days is fixed free. After that, an optional monthly plan.
Free, no obligation
Send us your idea — or a photo of your paper form. Get clickable screens back in 48 hours.
Before you spend a rupee, see your own business working as software. We design the most important screens of your idea and send you a link you can click through. Free, and yours to keep whatever you decide.
Our own products
We run software, not just build it — and several can be set up for your business
MarketplaceLiveBasket of PahadAuthentic Products from India's Hills and HimalayasLive in Kumaon, Uttarakhand — now opening across India's hills and Himalayas.See it running
Workforce systemLiveSitePulseAttendance that knows where it happenedSee it running
Trade catalogueLiveJoshi InduscorpTools, equipment and the people who know which one you needSee it running
HR & payroll softwareLiveCoreStack PeopleHiring, HR, attendance, leave and payroll for any business — a factory, a hospital, a shop, a school or an officeSee it running
Who you will be working with
I started CoreStack to build the software small and mid-sized businesses actually run on — not slide decks about it.
Every product on this site was designed, built and is operated by us. When you work with CoreStack you talk to the people writing your code, from the first call to the day it goes live and after.
Krishna Joshi
Founder, CoreStack Technology
What you get, every time
Six promises, in writing
- You own the codeSource code, designs and data are yours. Everything is handed over, documented, at the end.
- Fixed price, in writingThe price we quote is the price you pay for that scope. Changes are quoted before they are built.
- Pay by milestoneA small advance, then payments as working pieces are delivered. Never everything up front.
- A demo every weekWorking software on a link every week — not a status report.
- NDA on requestYour idea stays yours. We sign a non-disclosure agreement before you share the details, if you want one.
- 30 days of free fixesAny defect in what we delivered, found in the first 30 days after launch, is fixed at no cost.
FAQ
Questions people ask before they write
How much will my project cost?
The prices on this site are honest starting points. Send us a description — even two lines — and we will reply with a range the same day, and a fixed quote after the free design.
How long does it take?
A business website, 1–2 weeks. A store, 3–6. A mobile app or business software, 4–8 depending on size. You get a timeline in writing with the quote, and see progress every week.
Do you work with clients outside India?
Yes. We work with clients across time zones, invoice in INR or USD, schedule calls in your working hours, and keep you updated in writing so nothing waits on a meeting.
Is the free design really free?
Yes. You get clickable screens of the most important part of your idea within 48 hours of sending us the details. No obligation, and you keep them.
Who will actually build it?
Us — the same team that built and runs every product on this site. Nothing is subcontracted without telling you.
What happens after launch?
Thirty days of free fixes, then an optional monthly support plan. Or we hand everything over to your own team with documentation — your choice.
What technology do you use?
Spring Boot (Java), React and PostgreSQL for most work, running on AWS or wherever you prefer. Mainstream, well-supported technology any good developer can maintain after us.
Start a project
Tell us what you need — get an answer within a day
You do not need a specification. Pick what fits, add a sentence about your business, and send it. We reply with an honest range, next steps and, if you want it, a free design.
Nothing here is submitted to a server. What you choose and write becomes a message you send yourself, so you can see it and change it first.
We reply within one working day
Or call +91 83778 76652 · krishan.joshi@corestacktechnology.com