InstaSend

Overview

An exploratory Spring Boot project studying campaigns, scheduling, queued processing, and audit logging.

The problem

Email automation needs more than a send action: campaigns, scheduling, worker execution, and a record of what happened.

The solution

The project explores campaign management, address validation, scheduled messages, queues, background workers, audit logging, and soft deletes.

Architecture & data flow

A modular Spring Boot backend explores the boundaries between campaign management, scheduling, queue processing, and persistence.

The engineering challenge

Coordinating scheduled messages with background processing and an auditable history.

Key features

• Campaign management and email validation
• Scheduling and queued work
• Background processing
• Audit logging and soft deletes

Design decisions

• Keep scheduling separate from worker execution.
• Treat campaign state and audit history as distinct responsibilities.

Performance considerations

Areas to evaluate as the workload grows; no benchmark results are claimed.

• Retry policy and duplicate delivery need explicit treatment before production use.
• Measure worker throughput and queue growth before choosing concurrency limits.

Security boundaries

This is an exploration, not a production delivery claim. A deployed service would need protected credentials, recipient authorization, and access controls around campaign data.

A look at the product

What I learned

The project is a way to study how scheduled work, background execution, and auditability fit together.