Engineering you can check before you pay for it.
We build websites, test application security, and implement ERPNext for businesses across the US.
- Website builds from $1,950 — and every price is written down before we start
- Every client site we show is live and clickable
- The same two engineers scope your project and do the work
Four things, done properly.
Most clients come for one and stay for another. It's the same two engineers either way.
A site nobody can find isn't doing its job
SEO and your Google Business Profile for the earned side, Google and Meta campaigns for the paid side, and tracking that shows which one is actually producing inquiries.
- Technical & on-page SEO, Google Business Profile
- Google Ads and Meta campaigns on an account you own
- GA4 and conversion tracking, wired before any spend
- Posters, flyers and social creatives to match
A few of our clients. All live. Click any of them.
A selection of the work we can show publicly — no mockups, no invented case studies. If it's on this page, it's running in production right now.
Heartland Homebuyers
Real estate
Conversion-focused site with lead capture for a cash home-buying business.
heartland-homebuyers.com
All In 1 Rentals
Car rental · Hamilton, OH
Booking platform — vehicle catalog, live availability, reservations, admin dashboard.
allin1rentals.us
Knox Overland
Adventure vehicles · Knoxville, TN
Visual-first brand site for a custom overland vehicle builder.
knoxoverland.com
Balakrishna Jewellery
Jewellery retail · Palakkad, India
Storefront site for a family jeweller trading since 1955 — collections, story and directions.
balakrishnajewellery.in
All In 1 Shop
E-commerce
Online store — catalog, search, cart and checkout.
allin1shop.us
We write the report your auditor asks for.
Web and API penetration testing against the OWASP Top 10.
- Every finding scored with CVSS
- Reproduction steps your developers can act on
- One free retest once you've fixed it
What we don't issue
We are not a QSA, an ASV or a CPA firm. We don't issue SOC 2 attestations or PCI Reports on Compliance, and we'll tell you plainly the moment you need someone who does.
Broken object-level authorization
An authenticated user reads another tenant's records by changing the id on /api/v1/invoices/{id}.
→ Enforce object-level authorization on every route. Retest included.
This is an example of how we write findings, not a real client's result. Client reports are confidential.
Fixed scope. Fixed price. Fixed dates.
You pay per milestone — through Upwork's escrow if you prefer.
- Day 0
Call
20 minutes. We work out what you actually need — and tell you if it isn't us.
- Day 3
Written plan + fixed price
Scope, price and dates in writing before anything starts.
- Day 10
Something you can click
A real build in staging, not a mockup. You give notes.
- Day 21
Live
Launched, tracked, and handed over. You own everything.
You'll be on the call with Subin.
Quantis Sphere is founder-led. The person who scopes your project is the person who does the work.
Subin Sunder Raj — engineering and security
- Cisco-certified ethical hacker
- Top-three finish in a national CTF
- Top Rated record on Upwork across 1,700+ hours
Thejaswini Kishore — data and systems
- PhD candidate in computer science
- Patent applications and published research
There is a small in-house team behind us who build, test and monitor. You can check both of us before you spend anything.
What clients say when the work ships.
Quoted from project emails, published with each client's permission.
“It is not always easy to find someone you can trust with an important project, but Subin and Quantis Sphere were fantastic. He was honest, professional, and very thorough. He explained everything clearly and never made us feel rushed. We are very pleased with the work and will definitely be reaching out again.”
“Quantis Sphere did an amazing job for me! Subin was very professional, patient, and thorough throughout the entire project. He took the time to understand exactly what we needed and explained everything clearly. I was very impressed with the quality of his work and would definitely recommend Quantis Sphere to anyone looking for reliable and professional service.”
“Quantis Sphere exceeded my expectations. Subin was thorough, knowledgeable, and very responsive whenever I had questions. Everything we discussed was handled carefully, and the final result was exactly what we were looking for. I highly recommend Quantis Sphere and would definitely work with them again.”
Straight answers.
Where are you based?
Tamil Nadu, India. We work US Eastern hours, we speak English, and we say so up front — you should know exactly who you're hiring.
Who will I actually work with?
The founders. Subin leads engineering and security; Thejaswini leads data and systems. There's a small in-house team behind us, but you talk to us.
How do you price?
Fixed scope and fixed price, agreed in writing before work starts — website builds start at $1,950, and every published number is on the pricing page. If the scope changes we re-quote first; you're never surprised by an invoice.
Can I check your work before I commit?
Yes. The client sites we show are a selection, and every one is live and clickable; our Upwork record is public and verifiable, and we'll put you in touch with a client before you sign.
Do you issue SOC 2 or PCI compliance?
No. We're not a QSA, ASV or CPA firm. We produce the penetration-test report and technical evidence your auditor accepts — and we'll tell you plainly when you need a licensed firm.
Tell us what you need built.
One line is enough to start.
You get a written scope and a fixed price — and an honest answer if we're not the right people for it.