Kalhara JA← All Works
KJA·2026 · Case study
Advisory Workstation Email
Production-ready Email Queue & Multi-tenant Org Management
The brief
A high-performance email delivery engine built with Next.js and Prisma, providing a reliable queue system, block-based template building, and advanced organization management for multi-tenant applications.
Approach
Built a block-based email builder with live preview on Next.js/Prisma, backed by a queue with exponential-backoff retries and dead-letter handling, secured with Better Auth RBAC for multi-tenant organizations.
Outcome
Delivered a production-ready delivery engine for Richmond Capital LLC with real-time status tracking via Resend webhooks and full Swagger/OpenAPI documentation.
Key features
Advanced Template Management
Comprehensive CRUD system for email templates featuring searchable/filterable indexes, duplication, and archiving workflows.
Block-based Email Builder
Powerful visual editor for creating responsive React Email templates with drag-and-drop capability and live rendering.
Live Preview & Test Sending
Instant visual feedback in the editor with built-in functionality to send real-world test emails to verified recipients.
Dynamic Merge Tag System
Sophisticated placeholder engine that allows for deep personalization using recipient data and custom attributes.
High-Reliability Queuing
Automated queue processing with exponential backoff retries, batch handling, and dead-letter queue management for failed deliveries.
Real-time Status Tracking
Integrated webhook endpoints to monitor delivery, open, and bounce events directly from the Resend API.
Multi-tenant Organization System
Enterprise-ready organization management allowing Super Admins to manage multiple isolated client environments.
RBAC Security Framework
Role-based access control (Super Admin, Org Admin, User) powered by Better Auth for secure user isolation.
Contact & Recipient Management
Dedicated module for managing subscriber lists, contact metadata, and recipient selection for bulk or transactional sends.
Comprehensive Dashboard Analytics
Single-page monitoring interface providing statistics on success/failure rates, queue status, and historical delivery logs.
Interactive API Documentation
Full Swagger/OpenAPI specification hosted within the app for seamless third-party service integration.