E-commerce and marketplace development
Tankar builds commerce platforms where an off-the-shelf store does not fit, including multi-vendor marketplaces with vendor self-service and payouts, B2B platforms with approvals and credit, and D2C stores with custom checkout. Uponyx, Tankar's own corporate-gifting platform, is built on the same foundations.
When custom commerce is the right call
A single-vendor store with a standard checkout belongs on an off-the-shelf platform. A custom build earns its cost when there are vendors to onboard, commissions to calculate, approvals and credit limits to enforce, or invoicing rules a template cannot express.
The parts that carry the rules
Payments, tax and payouts are built first because they have the most edge cases. Every payment webhook is reconciled against an order, every invoice carries the fields the tax authority expects, and every payout is traceable to the order lines it came from.
Proof from our own platform
Uponyx, Tankar's corporate gifting and bulk-order platform, uses the same catalogue, checkout and supplier-fulfilment foundations offered to clients.
Typical engagements
What this service usually produces, as deliverables rather than adjectives.
- Multi-vendor marketplace with vendor onboarding, commissions, payouts and GST-compliant invoicing
- B2B ordering platform with price lists, bulk checkout, approvals and credit limits
- D2C store with a custom checkout, subscriptions and loyalty
- Corporate gifting or bulk-order platform with branding options and supplier fulfilment
- Headless storefront on an existing commerce backend
How it runs
The stages this service goes through, and what you see at each one.
Discovery
Catalogue structure, roles, payment and tax rules, logistics partners and reporting needs. Written estimate within 48 hours.
The written estimate follows within 48 hours of the scoped call.
Design
Catalogue, cart, checkout and the vendor or buyer dashboards prototyped and reviewed with real product data.
Build
Sprints with a weekly demo. Payments, tax and invoicing are built early because they carry the most rules.
Test
Checkout flows tested in the browser on every pull request, payment provider sandbox tests, and load tests on catalogue search and checkout.
Launch
Catalogue import, payment provider go-live, logistics integrations verified with real shipments, and monitoring.
Run
Peak-season readiness, new payment and logistics partners, and a monthly report on conversion, errors and performance.
- Team shape
- A pod of a project manager, a designer, engineers and a QA engineer, with a director joining reviews of payment and tax flows.
Stack for this service
The technologies this work is usually built on, and why each one is used here.
| Technology | Why we use it here |
|---|---|
| Next.js | Product and category pages are server-rendered so they are indexed and load fast on mobile, where most shoppers are. |
| Node.js | Order, payment and inventory services with the integrations commerce needs. |
| PostgreSQL | Orders, inventory and payouts need transactions; one database keeps them consistent. |
| Redis | Cart sessions, catalogue caching and rate limiting during peaks. |
| Payment gateways and UPI | Stripe and Razorpay for cards and wallets, UPI for Indian buyers, with webhooks reconciled against orders. |
| GST and e-invoicing APIs | Indian platforms need GST-compliant invoices and, above the turnover threshold, e-invoicing through the IRP. |
Selected work
Case studies where this service carried the engagement. Only outcomes with a source are shown.
Anonymised clientRetail and e-commerceA multi-vendor marketplace with vendor self-service and compliant invoicing
A marketplace where vendors onboard themselves, list and price their own stock, and are paid out against a commission engine with GST-compliant invoices.Services: E-commerce and marketplace development, Custom software development and 1 moreRead the case study- Own productRetail and e-commerce
Uponyx: a corporate gifting and bulk-order platform
A gifting platform where a corporate buyer picks a catalogue, brands it, gets it approved internally and tracks delivery to many addresses.Services: E-commerce and marketplace development, UI/UX design and 1 moreRead the case study
Engagement models that fit
A first release is usually fixed price against a scope document; growth after launch runs on a dedicated team.
- Fixed priceA defined scope with a clear end state: an MVP, a website, a well-specified module or an integration.
- Time and materialsEvolving products, research-heavy work such as AI features, and engagements where the backlog is set sprint by sprint.
- Dedicated teamOngoing product development where you want engineers who know the codebase and stay on it, working as an extension of your own team.
Questions buyers ask
What buyers ask most about this service, answered before the first call.
Tell us what you are building.
NDA on request. Written estimate within 48 hours of a scoped call. Reply within one business day.