Understand APIs, business rules, permissions, integrations, background work, and operational evidence.
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Lesson 1
The backend receives requests, applies business and permission rules, coordinates data and external services, and returns controlled results. Learn the founder decision, practical evidence, and warning signs that matter.
Lesson 2
An API is a defined way for software systems to communicate; an endpoint is a specific address and operation within that interface. Learn the founder decision, practical evidence, and warning signs that matter.
Lesson 3
Business logic is the set of product-specific rules that decides what may happen, in what order, and with what consequence. Learn the founder decision, practical evidence, and warning signs that matter.
Lesson 4
Authentication establishes identity; authorisation determines which data and actions that identity is permitted to access. Learn the founder decision, practical evidence, and warning signs that matter.
Lesson 5
A role groups responsibilities, while permissions state the specific actions and resources available to an identity. Learn the founder decision, practical evidence, and warning signs that matter.
Lesson 6
External services perform work outside the product's direct control, such as storing files, delivering messages, or processing payments. Learn the founder decision, practical evidence, and warning signs that matter.
Lesson 7
A background job performs work outside the immediate request, and a queue stores that work until a worker can process it. Learn the founder decision, practical evidence, and warning signs that matter.
Lesson 8
Rate limiting restricts repeated requests over time, while abuse protection combines limits with identity, validation, monitoring, and product rules. Learn the founder decision, practical evidence, and warning signs that matter.
Lesson 9
Errors describe failed operations, logs record technical events, and audit trails preserve who performed important business actions and when. Learn the founder decision, practical evidence, and warning signs that matter.
Lesson 10
A monolith deploys product capabilities together, while microservices separate capabilities into independently operated services. Learn the founder decision, practical evidence, and warning signs that matter.
Lesson 11
A backend proposal review tests whether the suggested rules, data flows, integrations, permissions, and operating model fit the product's actual risk. Learn the founder decision, practical evidence, and warning signs that matter.