Tutorials System Design Tutorial
Serverless Architecture Patterns — Complete Guide
Serverless Architecture Patterns — Complete Guide: free step-by-step lesson with examples, common mistakes, and interview tips — part of System Design Tutorial on Toolliyo Academy.
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System Design Tutorial · Lesson 54 of 100
Serverless Architecture Patterns
Basics ✓ → Scale → Interview
Scale · 2 — Distributed · ~10 min · Module 6: Cloud-Native Architecture
What is this?
Serverless runs code on demand (functions) or consumes managed event services — you pay for use and skip server babysitting.
Why should you care?
ShopNest image-resize or webhook handlers may fit functions better than always-on pods.
See it live — copy this example
Sketch the architecture on paper. These lessons focus on concepts and trade-offs.
Upload event → Function resize → write thumbnails
API Gateway → Function for rare admin reports
Care: cold starts; time limits; local state forbidden
Checkout core often stays on always-on servicesRun Example »
This lesson uses terminal or setup steps. Run commands on your computer — the live editor appears on coding lessons.
What happened?
- Great for spiky, short work.
- Cold starts and timeouts constrain design.
- Keep critical low-latency checkout on warm services unless proven otherwise.
Practice next
- Pick one ShopNest async task for functions.
- Keep checkout API on containers.
- Design idempotent function handlers.
- Chain functions with a queue, not giant sync calls.
- Measure cold start on p95.
Remember
Serverless for spiky side work. Watch cold start & limits. Core paths may stay warm.
Thumbnail function
ShopNest resizes seller uploads via serverless.
Outcome: No dedicated resize fleet sitting idle all night.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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