Chapter 4

Batteries: Jobs, Mail, Storage, AI

The included primitives that ship with every Grit API.

~30 min total4 lessonsAssignment

By the end of this chapter you'll be able to

Run background jobs
Send transactional email
Upload files
Call the AI Gateway

Lessons

Module: Async + IO

Background jobs (Asynq)

Enqueue, retry, schedule.

9mmedium

Transactional email

Resend + HTML templates.

6measy

File storage

S3-compatible: R2, MinIO, B2.

7mmedium

AI Gateway

Streaming + 100+ models.

8mmedium

Chapter assignment

Welcome flow end-to-end

When a user signs up: enqueue a welcome-email job (Asynq) that sends an HTML email (Resend → Mailhog in dev), uploads a default avatar to MinIO, and writes one line of a personalised greeting via the AI Gateway. Wire all three.

See success criteria

Lesson 1 takes ~9 min.

Start chapter

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ch.3: Auth & RBAC ch.5: Security + Observability