The JavaScript ecosystem moves fast. Every month there's a new framework claiming to be the future. After years of building production systems, I can tell you which technologies actually deliver value and which are just hype. The goal isn't to use the newest tech—it's to use the right tech for your problem.
Frontend: React + TypeScript + Next.js
React has been around for over a decade now. It's mature, battle-tested, and has a massive ecosystem. TypeScript catches bugs before they reach production. Next.js handles routing, server-side rendering, API routes, and deployment seamlessly. Together, they form a powerful foundation.
- Over-complicated state management: Context API is usually enough. Redux adds complexity that most projects don't need.
- Premature optimization: Measure first. Most performance problems aren't where you think they are.
- Too many abstractions: Keep it simple. Every abstraction layer adds complexity and makes debugging harder.
The React ecosystem is mature. You have libraries for everything: form handling (React Hook Form), data fetching (TanStack Query), styling (Tailwind), testing (Vitest), and more. The key is choosing boring, well-maintained libraries over shiny new ones.
Backend: Node.js + Express/Fastify + PostgreSQL
Node.js lets you use JavaScript across your entire stack. This means your frontend and backend developers can work on either side. The async/await model is perfect for I/O-heavy operations. The ecosystem is rich and mature.
PostgreSQL is boring. It's been around for decades. It's rock-solid. It has ACID compliance, JSON support, full-text search, and excellent performance. Don't use NoSQL unless you have a specific reason. Most projects don't.
Why not Go/Rust/Python? These are great languages, but they add complexity. You need different developers for frontend and backend. Deployment is more complex. Debugging is harder. For most SaaS products, Node.js + PostgreSQL is the right choice.
Authentication: OAuth + JWT
- Use OAuth for social login: Google, GitHub, etc. Don't make users create another password.
- Use JWT for API authentication: Stateless, scalable, works well with microservices.
- Store refresh tokens securely: Use httpOnly cookies. Never store sensitive tokens in localStorage.
- Implement proper session management: Know when sessions expire. Refresh tokens before they expire.
- Use HTTPS everywhere
- Implement rate limiting on auth endpoints
- Use strong password hashing (bcrypt, argon2)
- Implement CSRF protection
- Log authentication events
Deployment: Docker + Kubernetes or Serverless
Choose Based on Your Needs:
- Great for startups
- Simple scaling
- Pay for what you use
- Limited customization
- More control
- Better for complex applications
- Higher operational overhead
- Better for teams with DevOps expertise
- Overkill for most SaaS products
- More expensive than serverless
- More control than serverless
For most startups, I recommend Vercel for frontend and AWS Lambda or a simple VPS for backend. As you grow, you can move to Kubernetes if needed.
Monitoring and Observability
- Logging: Structured logs to a centralized service (DataDog, Papertrail)
- Error Tracking: Sentry or similar
- Performance Monitoring: New Relic, DataDog, or Prometheus
- Uptime Monitoring: Pingdom, UptimeRobot
- User Analytics: Mixpanel, Amplitude, or Plausible
Building for Observability: Make observability a first-class concern. When you write code, think about how you'll debug it in production. Add logging at key points. Add metrics for important operations. This pays dividends when things go wrong.
Testing Strategy
- Unit tests: Fast, cheap, test individual functions
- Integration tests: Test how components work together
- E2E tests: Test the entire user flow
Most teams get this backwards. They write too many E2E tests and not enough unit tests. Unit tests are fast and cheap. Write lots of them.
Conclusion
The best tech stack is the one your team knows well and that solves your actual problems. React + Node.js + PostgreSQL isn't the most cutting-edge, but it's reliable, well-documented, and has a massive community. That's worth more than chasing the latest trends. Focus on building a great product, not on using the newest technology.