Tutorials System Design Tutorial
Microservices Architecture Fundamentals — Complete Guide
Microservices Architecture Fundamentals — 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 41 of 100
Microservices Architecture Fundamentals
Basics ✓ → Scale → Interview
Scale · 2 — Distributed · ~6 min · Module 5: Microservices and Event-Driven Systems
What is this?
Microservices split a product into independently deployable services aligned to domains, communicating over the network.
Why should you care?
ShopNest catalog and checkout teams need to ship on different clocks without one monolith deploy locking both.
See it live — copy this example
Sketch the architecture on paper. These lessons focus on concepts and trade-offs.
Services: Catalog | Cart | Order | Payment | Inventory
Sync: HTTP/gRPC for request/response
Async: events for order_placed
Rule: no shared DB tables across servicesRun Example »
This lesson uses terminal or setup steps. Run commands on your computer — the live editor appears on coding lessons.
What happened?
- Independence needs clear APIs and data ownership.
- Too many tiny services create a distributed monolith of coupling.
- Start from domains, not from class count.
Practice next
- Split ShopNest into 4–6 services by domain.
- Assign a database per service (logical at least).
- Pick sync vs async for each dependency.
- Merge two overly chatty services.
- Publish order_placed instead of calling three systems inline.
Remember
Deploy independently by domain. Own your data. Prefer fewer well-bounded services.
ShopNest service map
Checkout and catalog deploy separately.
Outcome: Catalog experiments no longer risk payment releases.
Interview prep for this lesson
Practice these questions aloud after reading—each links to a full structured answer.
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