Emails
Send welcome emails in the background
Queue an email job at sign-up, send it from a worker and let Halyard retry when your email provider has a bad minute.
Beginner8 min
- Node.js
- Python
Mara Ilves
Guides
Build real features with Halyard, end to end.
Each guide takes one job you actually have, like welcome emails, nightly reports or a crontab you want gone, and walks through it with working code in Node.js and Python, the failure cases included.
- Guides
- 6
- Topics
- 6
- Reading time
- 77 min
- Updated
- October 14, 2026
Featured guideEvents
Fan out events to many services
Publish one order.paid event and let receipts, inventory and analytics each react on their own queue, with their own retries.
Intermediate12 min
- Node.js
- Python
- Go
- cURL
Tomás ReyesStaff engineer, PlatformStart the guide
All guides
Showing 9 of 9 guides
Topic
Level
- Media
Process image uploads
Resize uploads into web-ready sizes on a dedicated media queue, report progress to the browser and keep big files from starving other work.
Intermediate14 min- Node.js
- Python
Priya Natarajan - Events
Fan out events to many services
Publish one order.paid event and let receipts, inventory and analytics each react on their own queue, with their own retries.
Intermediate12 min- Node.js
- Python
- Go
- cURL
Tomás Reyes - Scheduling
Build a nightly report
Run a report at 02:00 in your team's time zone, compute it from the scheduled slot rather than the clock, and backfill missed days.
Beginner10 min- Node.js
- Python
- cURL
Priya Natarajan - Migration
Migrate from cron jobs
Move a crontab to Halyard schedules one entry at a time, with retries, logs and time zones you can see, and no night without a run.
Intermediate15 min- Node.js
- Python
- cURL
Tomás Reyes - Reliability
Make jobs idempotent
Design jobs that are safe to run twice: idempotency keys at enqueue, upserts in the worker and the job ID passed to every downstream call.
Advanced18 min- Node.js
- Python
Mara Ilves - ReliabilityComing soon
Throttle calls to a rate-limited API
Use queue rate limits and token buckets to stay under a partner's 100 requests per minute without dropping work.
Advanced16 min- Node.js
- Go
Tomás Reyes - MediaComing soon
Transcode video with progress updates
Split a long transcode into chunks, run them in parallel and stitch the result together when the last one finishes.
Advanced20 min- Python
Priya Natarajan - EmailsComing soon
Send a weekly digest
Batch a week of activity per user and send one email each Monday morning in every reader's own time zone.
Intermediate12 min- Node.js
- Python
Mara Ilves
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