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Backend
Transactional Email & Job Scheduling API
A production-grade backend API in Go that handles transactional email delivery and cron job scheduling. It runs in multi-server environments without duplicate job execution and can survive server restarts via an optional AWS execution path.
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What it does
- SMTP email delivery with connection pooling
- OTP verification with Redis-backed TTL
- Multi-replica-safe cron scheduler using PostgreSQL row-level locking, prevents duplicate job execution across servers
- Optional AWS execution path: EventBridge triggers SQS which invokes Lambda, jobs survive server restarts
- Full infrastructure provisioned as code with AWS CloudFormation
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Challenge and outcome
The challenge
Designing a cron scheduler that never executes the same job twice across multiple replicas, solved with PostgreSQL row-level locking, and an execution path that survives server restarts.
The outcome
Live and publicly accessible. Demonstrates cloud architecture, infrastructure as code, distributed systems thinking, and production-grade Go engineering.