Backend Technologies Skill

Quick Start - Express.js API

import express, { Request, Response } from 'express';
import { prisma } from './lib/prisma';

const app = express();
app.use(express.json());

// GET all users
app.get('/users', async (req: Request, res: Response) => {
  try {
    const users = await prisma.user.findMany();
    res.json(users);
  } catch (error) {
    res.status(500).json({ error: 'Failed to fetch users' });
  }
});

// POST new user
app.post('/users', async (req: Request, res: Response) => {
  const { email, name } = req.body;
  try {
    const user = await prisma.user.create({
      data: { email, name }
    });
    res.status(201).json(user);
  } catch (error) {
    res.status(400).json({ error: 'Invalid data' });
  }
});

app.listen(3000, () => console.log('Server running on 3000'));

Core Technologies

Languages

• Node.js - JavaScript runtime
• Python - Versatile with many frameworks
• Java - Enterprise standard
• Go - Concurrent systems
• Rust - Systems programming

Web Frameworks

• Express, Fastify, NestJS (Node.js)
• Django, FastAPI, Flask (Python)
• Spring Boot, Quarkus (Java)
• Gin, Fiber (Go)
• Actix, Axum (Rust)

Databases

• SQL: PostgreSQL, MySQL
• NoSQL: MongoDB, DynamoDB
• Cache: Redis, Memcached
• Search: Elasticsearch

API & Messaging

• REST APIs with best practices
• GraphQL API design
• gRPC for microservices
• WebSockets for real-time
• Kafka, RabbitMQ for messaging

ORM/Query Tools

• Prisma, Sequelize (Node.js)
• SQLAlchemy, Tortoise (Python)
• Hibernate, Spring Data (Java)
• GORM (Go)

Best Practices

1. API Design - RESTful or GraphQL standards
2. Database - Proper indexing and optimization
3. Security - Input validation, parameterized queries
4. Error Handling - Meaningful error messages
5. Testing - Unit and integration tests
6. Documentation - OpenAPI/Swagger docs
7. Logging - Structured logging
8. Performance - Response time optimization

Resources

• Express.js Documentation
• FastAPI Documentation
• Spring Boot Guide
• PostgreSQL Documentation
• GraphQL Official