ADHURI CART – Scalable E‑commerce Backend with Adonis.js

Overview

ADHURI CART is a scalable e‑commerce backend built on Adonis.js with JWT authentication, PostgreSQL, caching, and robust observability. The goal was to modernize a legacy monolith that caused slow checkouts and recurring security incidents.

Before → After (Checkout p95)

2.6s → 1.5s (−42%)

Metric	Before	After	Change
Checkout p95	2.6s	1.5s	−42%
Error rate	1.8%	0.6%	−66%
Uptime (90d)	99.2%	99.9%	+0.7 pp

Problem

• Monolith tightly coupled to views and business logic
• Slow checkout flows (p95 > 4.5s on peak traffic)
• Auth/session handling vulnerable to common OWASP issues
• No separation for inventory, orders, payments

Solution

• Domain‑oriented modular architecture: auth, catalog, cart, orders, payments
• JWT for stateless auth + refresh tokens and RBAC
• PostgreSQL with tuned indexes and connection pooling
• Caching for product/cart reads to reduce DB load
• Queues for order fulfillment and email notifications
• Observability: structured logging, metrics, health checks

Architecture

• API gateway exposes RESTful endpoints with versioning (e.g., /v1/orders)
• Service layer encapsulates domain rules; repositories handle persistence
• Validation at the edge; rate limiting and input sanitization

Outcomes

• Checkout time: −42% (p95 ~ 2.6s → 1.5s)
• Uptime: 99.9% sustained over 90 days
• Compliance: aligned with OWASP best practices

Timeline

• Discovery & planning: 1 week
• Implementation: 3–4 weeks
• Stabilization & launch: 1 week

Stack

• Adonis.js, TypeScript, PostgreSQL, Redis, JWT, REST

Key Learning

Modular boundaries and observability drove most of the reliability gains while JWT + RBAC simplified auth flows across services.