Zari Windows
A subscription SaaS for the precious metals and jari trade — live rates, billing, and calculations on Android, iOS, and Web.
Timeline
6 months
Team Size
2 engineers
Industry
FinTech
Region
India
Tech Stack
The Problem We Solved
Traders in the jari and precious metals industry rely on live metal prices and precise billing calculations — but existing tools are generic spreadsheets or outdated desktop software. They needed a subscription product with real-time rates, secure accounts, and polished mobile and web access that traders trust with financial decisions.
The Complexity — Real-Time Financial Data at Scale
Live metal prices from external APIs pushed via Socket.IO, subscription billing through Razorpay and in-app purchases, OTP authentication via Twilio, multi-platform Flutter builds, and CockroachDB for reliable financial data — all with sub-second rate updates traders depend on.
- Real-time metal prices via Metals API and Socket.IO
- Razorpay + App Store / Play Store subscription flows
- OTP verification and JWT-secured sessions
- Flutter across Android, iOS, and Web from one codebase
The Solution — Flutter SaaS on a Real-Time Node.js Backend
Flutter delivers a consistent experience on phone and web. Node.js with PostgreSQL/Prisma and Redis handles auth, billing, and live price feeds. Cloudinary CDN optimizes media; Google Cloud hosts the infrastructure. Traders subscribe, see live rates, and run calculations in one app.
Feature Showcase
01 — Live Bullion Rates
Spot rates, pushed live via Socket.IO.
Real-time gold and silver spot rates sourced from the Metals API and pushed to users instantly via Socket.IO. Traders and jari businesses see live market movements the moment they happen, without needing to refresh or check external sites — keeping every pricing decision grounded in current market data.
02 — Live Jari Rates
Jari rates that move with the market.
A realtime calculation engine that converts live gold and silver spot rates into jari-specific pricing on the fly. As metal prices move, jari rates update automatically, eliminating manual recalculation and giving traders an always-accurate reference rate tailored to their industry.
03 — Jari Calculators
Every category, one calculator suite.
A suite of purpose-built calculators covering the different categories and units used in the jari trade. Users can quickly compute costs, conversions, and valuations across categories using live rate data, replacing manual math and spreadsheet workarounds with a single in-app tool.
04 — Subscriptions
Subscribe on Razorpay, Play Store, or App Store.
A unified billing system combining Razorpay for direct subscriptions with native in-app purchases through Google Play Console and Apple App Store. Users can subscribe, upgrade, or renew seamlessly across Android, iOS, and Web, with subscription state kept in sync across platforms.
05 — Community Admin
Announcements built for the jari community.
A dedicated admin panel for reviewing community activity and publishing announcements directly to the jari community within the app. Admins can moderate content and broadcast updates — rate alerts, business notices, or platform news — keeping the entire user base informed in one centralized channel.
How We Made It Simple
Traders open the app and see today's rates immediately. Calculations follow familiar industry formulas — no training manual needed. Subscription and OTP flows are streamlined to under a minute.
Tech Stack
Gallery
“Working with Hardik on our SaaS app, Zari Windows, was an incredible experience. They not only delivered excellent service but also took the time to simplify complex tech stacks, tools, and technologies for us. From deploying on Google Cloud to setting up Razorpay integrations, their support with platform verifications was invaluable. A true professional who goes above and beyond.”
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