🎯 Senior Fullstack Developer Assessment - 6 Key Screening Areas

📋 Assessment Overview

This assessment is specifically designed to evaluate senior fullstack developers on the 6 key areas where previous candidates have struggled:

🎯 6 Key Screening Areas

1. System Design Depth - Can they design scalable/resilient services without heavy guidance?
2. Database Reasoning - Do they understand ACID, scaling strategies, SQL vs. NoSQL trade-offs?
3. Scalability & Availability - Can they design for high load and HA in AWS?
4. Concurrency & Consistency - Can they prevent race conditions, ensure payment/booking integrity?
5. NestJS Expertise - Beyond coding — do they know how to structure, test, and scale apps in Nest?
6. Communication - Can they explain design choices clearly in English?

🚀 Quick Start

Backend Setup

cd backend
npm install
cp env.example .env
npm run start:dev

Frontend Setup

cd frontend
npm install
npm start

Database Setup

# Using Docker
docker-compose up -d

# Or local MongoDB
mongod

📚 Assessment Materials

For Candidates:

• CHALLENGE_INSTRUCTIONS.md - Detailed task breakdown
• CODING_CHALLENGES.md - Specific coding challenges
• TECHNICAL_QUESTIONS_BANK.md - Technical questions

For Evaluators:

• EVALUATOR_GUIDE.md - Complete evaluation guide
• EVALUATION_GUIDE.md - Technical evaluation criteria

🎯 Assessment Structure (60 minutes)

Phase 1: Pre-Coding Screening (15 minutes)

• System Design questions
• Database reasoning
• Concurrency understanding

Phase 2: Coding Challenges (35 minutes)

• System architecture design
• Database schema design
• Concurrency implementation

Phase 3: Deep Dive (10 minutes)

• NestJS expertise
• AWS scalability
• Communication skills

📊 Scoring Rubric (100 points total)

System Design (25 points)

• Architecture Planning: 10 points
• Load Balancing: 5 points
• Microservices vs Monolith: 5 points
• Event Processing: 5 points

Database Reasoning (20 points)

• Database Choice: 8 points
• ACID Understanding: 6 points
• Scaling Strategy: 6 points

Scalability & Availability (20 points)

• AWS Architecture: 8 points
• Caching Strategy: 6 points
• High Availability: 6 points

Concurrency & Consistency (20 points)

• Race Condition Prevention: 8 points
• Idempotency: 6 points
• Error Recovery: 6 points

NestJS Expertise (10 points)

• Project Structure: 4 points
• Error Handling: 3 points
• Testing Strategy: 3 points

Communication (5 points)

• Technical Explanation: 3 points
• Trade-off Analysis: 2 points

🚨 Red Flags - Immediate Rejection

• ❌ No concurrency handling - Will fail in production
• ❌ No database justification - Shows lack of depth
• ❌ No scalability consideration - Cannot handle growth
• ❌ Poor NestJS structure - Lacks framework expertise
• ❌ Cannot explain choices - Communication issues

🎯 Expected Technical Depth

System Design:

• Load balancers and horizontal scaling
• Microservices vs modular monolith justification
• Event-driven architecture
• Comprehensive monitoring

Database:

• PostgreSQL vs MongoDB with specific use cases
• ACID compliance understanding
• Read/write separation strategies
• Proper indexing and query optimization

Concurrency:

• Database transactions with proper locking
• Idempotency implementation
• Retry logic with exponential backoff
• Circuit breaker patterns

NestJS:

• Feature modules and dependency injection
• Global exception filters
• Interceptors, guards, and middleware
• Comprehensive testing strategy

AWS:

• Multi-AZ deployment strategies
• Auto-scaling groups
• RDS with read replicas
• Proper monitoring and alerting

📝 Evaluation Notes

This assessment is designed to quickly identify real senior developers who can:

• Design scalable systems independently
• Justify technical choices with trade-offs
• Demonstrate real-world NestJS and AWS expertise
• Communicate clearly in English

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Remember: The goal is to identify candidates who can work independently and make sound technical decisions, not just write basic CRUD operations.