Full-Stack Senior Engineer Interview Preparation

A comprehensive, senior-level interview preparation repository covering languages, frameworks, databases, DevOps, system design, behavioral questions, and worst-case scenarios. Designed for engineers targeting senior full-stack / software engineering roles in the international market.

---

Quick Start

If you are...	Start here
Preparing for a senior full-stack role	Critical Scenarios, System Design, Behavioral
In a Laravel / PHP / Vue stack	Laravel, PHP, Vue.js, Merged Guide
In a Node.js / React / Next.js stack	Node.js, React, Next.js, Merged Guide
Preparing for system design rounds	System Design, Microservices, Scaling
Brushing up on algorithms	Algorithms
Worried about the HR round	HR Questions, Career Change
Worried about "no time for architecture"	Architecture Time Pressure

---

Repository Structure

fullstack-interview-preparation/
├── README.md                       ← you are here
├── languages/                      ← language deep-dives
├── frontend/                       ← React, Vue, Next, Nuxt, HTML/CSS, Tailwind
├── backend/                        ← Node.js, NestJS
├── databases/                      ← SQL fundamentals + MySQL / Postgres / MongoDB / Redis / MariaDB / SQLite
├── messaging/                      ← RabbitMQ, Kafka, WebSockets
├── devops/                         ← Docker, Linux, Nginx, Git, CI/CD
├── architecture/                   ← microservices, system design
├── algorithms/                     ← coding patterns, SQL puzzles, DSA, Big-O
├── performance/                    ← optimization at every layer + scaling to millions
├── critical-scenarios/             ← worst case, financial, architecture-under-pressure
├── behavioral/                     ← HR, behavioral STAR, career change, AI questions
└── fullstack-guides/               ← merged comprehensive references

---

Languages

Deep-dive Q&A on programming languages — basic to advanced, with senior-level pitfalls and trade-offs.

File	Topic	Q&A
JavaScript	Vanilla JS / ES6+ / ECMAScript	90+
TypeScript	Generics, utility types, type-level programming	56+
PHP	PHP 8.x, OOP, modern features, security	62+
Laravel	Deep Laravel framework knowledge	87+

---

Frontend

File	Topic	Q&A
React	Hooks, performance, patterns	45+
Next.js	App Router, SSR/SSG/ISR, Server Components	35+
Vue.js	Composition API, reactivity, Pinia	35+
Nuxt.js	Nuxt 3, Nitro, hybrid rendering	56+
HTML / CSS	Semantic HTML, Flexbox, Grid, modern CSS	72+
Tailwind CSS	Utility-first, JIT, design systems	45+

---

Backend

File	Topic	Q&A
Node.js	Event loop, streams, Express, scaling	38+
NestJS	Modules, DI, guards, interceptors, pipes	32+

---

Databases

File	Topic	Q&A
SQL Fundamentals	Joins, aggregates, CTEs, window functions, indexes, transactions	60+
MySQL	InnoDB, replication, performance, ops	48+
PostgreSQL	MVCC, JSONB, indexes, partitioning, advanced features	50+
MariaDB	MariaDB-specific features, Galera Cluster	47+
SQLite	WAL, FTS5, embedded use, scaling tools (Litestream, Turso, D1)	56+
MongoDB	Documents, aggregation, sharding, transactions	66+
Redis	Data structures, persistence, cluster, use cases	59+

---

Messaging & Real-Time

File	Topic	Q&A
RabbitMQ	AMQP, exchanges, queues, DLX, clustering	67+
Kafka	Partitions, ISR, semantics, Streams, Connect	71+
WebSockets	Protocol, scaling, Socket.io, Nginx/ALB config	52+

---

DevOps & Infrastructure

File	Topic	Q&A
Docker	Containers, multi-stage builds, networking, security	60+
Linux	Filesystem, systemd, networking, bash, troubleshooting	65+
Nginx	Reverse proxy, load balancing, TLS, caching, rate limiting	52+
Git	Internals, merge/rebase, hooks, common scenarios	61+
CI/CD + GitHub Actions	Workflows, OIDC, deployment strategies, comparison vs others	52+

---

Architecture & System Design

File	Topic	Q&A
Microservices	Patterns, sagas, CQRS, observability, anti-patterns	72+
System Design	URL shortener, Twitter, Chat, Uber, Dropbox, etc.	49 (16 deep dives)

---

Algorithms & Coding

File	Topic
SQL Algorithm Questions	Nth highest salary, top-N per group, gaps & islands, recursive CTEs
Coding Algorithm Questions	Two Sum, Kadane's, sliding window, DP, trees, graphs
Pattern Printing	Star/number patterns frequently asked in interviews
Data Structures Fundamentals	Arrays, lists, trees, heaps, graphs, tries — implementations
Big-O Complexity	Analysis, master theorem, cheat sheets

---

Performance & Scaling

File	Topic
Database Optimization	Indexing, query tuning, sharding, replication, caching
Laravel & PHP Optimization	OPcache, JIT, Octane, Eloquent tuning, FPM
JavaScript & Frontend Optimization	Bundle splitting, web vitals, React/Vue tuning
Node.js Backend Optimization	V8 profiling, event loop, connection pooling
Scaling to Millions	Multi-region, CDN, sharding, async patterns

---

Critical Scenarios (Interview Pain Points)

These are the questions senior interviewers love and most candidates fail.

File	What it covers
Architecture Under Time Pressure	Strong answer for "what if you don't have time to design?"
Worst Case Scenarios	Production outages, data loss, security incidents — incident playbook
Financial & Transactional Systems	Money handling, ACID, idempotency, double-entry, reconciliation

---

Behavioral & HR

File	What it covers
HR Questions	Self-introduction, why this company, strengths/weaknesses, salary negotiation
Behavioral Questions	STAR framework, leadership, conflict, failure, success stories
Career Change & Tricky Questions	Why change stack, why move company, "you're stuck in X", salary pushback
AI-Related Questions	How you use AI tools, AI replacing engineers, prompt engineering, ethics

---

Comprehensive Reference Guides

Combined, multi-topic preparation guides:

File	Stack
PHP / Laravel / Vue.js Complete Guide	Strategic prep + deep Laravel + 500-Q&A across PHP/Laravel/Vue/JS/MySQL/REST/Git
React / Next.js / Node.js Guide	Mid-level full-stack reference covering React/Next/Node/Postgres/system design

---

Recommended Study Plan

7-Day Intensive (Pre-Interview)

Day	Focus
1	Languages — your primary stack (Laravel or Node.js + JavaScript + TypeScript)
2	Frontend — your primary framework (React / Vue) + HTML/CSS
3	Databases — SQL Fundamentals + your DB (Postgres / MySQL / MongoDB) + SQL Algorithms
4	System Design — System Design + Microservices
5	DevOps — Docker, Linux, Git, CI/CD
6	Critical scenarios — Architecture Pressure, Worst Case, Financial Systems + Performance
7	Behavioral & HR — all 4 behavioral files. Mock interview. Rest.

30-Day Comprehensive

• Week 1: Languages + Frontend + Backend depth
• Week 2: Databases + Algorithms (SQL + coding)
• Week 3: Architecture + System Design + Performance
• Week 4: DevOps + Critical Scenarios + Behavioral + Mock interviews

---

How to Use This Repository

1. Don't memorize. Understand the concepts and practice explaining them in your own words.
2. Build real examples. For every concept, have at least one project example you can talk about.
3. Practice out loud. The interview room will not be the place to rehearse for the first time.
4. Cover trade-offs. Senior engineers are evaluated on trade-off thinking, not just answers.
5. Prepare 5-7 STAR stories. Mix them across behavioral questions.
6. Mock interview. Find a peer or use AI to simulate questions and give feedback.

---

Tips for Senior-Level Interviews

• Slow down. A 2-second pause before answering reads as thoughtful, not slow.
• Frame trade-offs explicitly. "If we optimize for X, we sacrifice Y" — that's the senior signal.
• Bring numbers. "p95 dropped from 800ms to 80ms" beats "made it faster."
• Own mistakes. "I underestimated X — here's what I learned" beats "everything went well."
• Ask clarifying questions. Especially in system design and behavioral rounds.
• Match the room. Read the interviewer — adjust depth, pace, and detail accordingly.

---

Topic Coverage Summary

Category	Files	Approx Q&A
Languages	4	295+
Frontend	6	288+
Backend	2	70+
Databases	7	386+
Messaging	3	190+
DevOps	5	290+
Architecture	2	121+
Algorithms	5	200+
Performance	5	375+
Critical Scenarios	3	Detailed playbooks
Behavioral	4	100+
Reference Guides	2	500+
Total	48	2800+ Q&A

---

Contributing

This is a personal interview preparation repository. If you find errors or want to add scenarios from your own interviews, feel free to fork and adapt. Each file is self-contained — no cross-file dependencies that prevent partial use.

---

License

This content is for personal interview preparation. Feel free to use, adapt, and share for non-commercial educational purposes.