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tushar jain.
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Flagship SaaS Product

RestaurantOS

Cloud-Native Multi-Tenant Restaurant Management SaaS. Centralizing POS, live table states, inventory tracking, RLS security, and instant WebSockets.

Live Application Preview

Interactive Operations Hub

tenant_id: main_branch_blr
● Live Websocket Connected
Active KOT QueueClick ticket to advance status
#KOT-8492Table 04

2x Truffle Pasta, 1x Sparkling Water

Ordered 2 mins ago
$42.00New
#KOT-8491Table 12

1x Wagyu Burger, 1x Craft IPA

Ordered 8 mins ago
$34.50Preparing
#KOT-8489Table 02

3x Woodfired Pizza, 2x Tiramisu

Ordered 14 mins ago
$78.00Ready
Live Analytics
Real-Time Revenue$4,128.50 (+14%)
Inventory Warnings2 Items Low Stock
Avg Prep Time9.4 mins
Reports
12 PM8 PM

Core capabilities

Designed for Modern Kitchens

Row Level Security (RLS)

Isolated multi-tenancy at the database level. Each restaurant organization only reads and mutates its own scoped relational tables.

WebSocket KOT Dispatch

Instant order sync between waiter tablets and kitchen displays with sub-50ms latency using Supabase Realtime listeners.

Real-Time Inventory Deduction

Atomic PostgreSQL database functions deduct raw ingredient stock upon order billing to eliminate warehouse discrepancies.

Role-Based Access Control

Granular administrative permissions separating waiters, chefs, floor managers, and financial accountants.

Offline Resilience Queue

Local IndexedDB caching ensures POS terminals continue taking orders during internet dropouts and sync cleanly on reconnect.

Dynamic Menu & Modifiers

Real-time updates to menu availability, seasonal pricing, and dish customizations across all POS nodes instantly.

System Design

SaaS Architecture Topology

An elegant, high-throughput distributed layout synchronizing state across nodes with row-level isolated relational storage.

POS TerminalMain DeskWaiter AppMobile Tablet WebTable UPI QRCustomer DeviceReact FrontendNext.js Client EngineState Machine / SyncSupabase GatewayWebSockets & AuthEdge API RouterPostgreSQL DBRow Level Sec (RLS)ACID TransactionsSQL Triggers/ViewsAnalyticsLive DashboardReal-time charts

Security & Isolation

Database Engineering Highlights

-- Enable Row Level Security (RLS) on transactions
ALTER TABLE orders ENABLE ROW LEVEL SECURITY;

-- Dynamic Tenant Access Isolation Policy
CREATE POLICY tenant_isolation_policy ON orders
    FOR ALL
    TO authenticated
    USING (
        tenant_id = (auth.jwt() ->> 'user_metadata')::jsonb ->> 'tenant_id'
    )
    WITH CHECK (
        tenant_id = (auth.jwt() ->> 'user_metadata')::jsonb ->> 'tenant_id'
    );