BackendPrep
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Role-BasedIntermediateFree Track

Backend Engineer Pack

Solidify core HTTP semantics, asynchronous execution, SQL indexing, connection pools, and clean API design.

Engineers interviewing for general Backend Engineer roles are expected to understand what happens under the hood when thousands of concurrent requests arrive: how the runtime executes asynchronous code without freezing, why database queries trigger full sequential scans, and how connection pools prevent cascade crashes. This pack synthesizes core questions, runtime quizzes, and architectural guides into a structured path.

Target AudienceBackend engineers with 1-3 years of experience targeting L4 / SDE-2 roles across product companies and high-growth startups.
Targeted Companies
DoorDashShopifyAtlassianTwilioRazorpay
3-4 WeeksPlan Duration
4Curriculum Modules
20Curated Questions
8Milestones

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Structured Syllabus

Curriculum Modules (Preview Mode)

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01

HTTP Protocol Semantics & API Contracts

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Safe vs. idempotent methods, status codes, CORS preflight, and RFC 7807 error schemas.

~6h
Target Competency & Objective:Understand how HTTP requests traverse from client sockets to server handlers, how headers control caching and authorization, and how to build deterministic API error schemas.

Core Technical Concepts Tested

Safe vs Idempotent Methods (GET, POST, PUT, PATCH, DELETE)Status Code Semantics (200, 201, 204, 400, 404, 409, 422, 429, 500)CORS Preflight (OPTIONS request, Origin header, Access-Control-Allow-*)Structured Error Contracts (RFC 7807 Problem Details)
What Fails in Production (Triage Scenarios):
  • Non-idempotent payment retries creating duplicate billing records
  • Inconsistent API error schemas crashing frontend mobile clients
  • Missing CORS configuration breaking cross-origin single-page applications

Module Milestones (0 / 2)

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02

Runtimes, Concurrency & Asynchronous Flow

Event loops, microtask queues, process.nextTick(), and non-blocking I/O.

~8h

Module 02 Content is Locked

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03

Database Indexing & Connection Pooling

B-Tree index traversal, composite key ordering, and pool exhaustion.

~8h

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04

Caching Topologies & Stampede Mitigation

Cache-aside, write-through, TTL jitter, and mutex locking.

~6h

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Module Outline

01. HTTP Protocol Semantics & API ContractsPreview02. Runtimes, Concurrency & Asynchronous FlowLocked03. Database Indexing & Connection PoolingLocked04. Caching Topologies & Stampede MitigationLocked

Specific Pack Deliverables

  • Mastery of single-threaded event loop vs multi-threaded concurrency models
  • Ability to read and optimize relational database query execution plans
  • Designing idempotent, backwards-compatible HTTP REST APIs with consistent error schemas
  • Preventing connection pool exhaustion and cache stampedes under traffic surges
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