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"Everyone wants to build the next Netflix, but for your first 1,000 users, you don't need 50 microservices. You need a Modular Monolith that won't break when traffic spikes. If you are building a backend in Java, here is the way to build it: 1. The Stack: Spring Boot + PostgreSQL/MongoDB Stick to the classics. Spring Boot provides the production-grade security and auto-configuration needed to move fast. Pair it with a reliable database like PostgreSQL or MongoDB depending on your data structure. 2. Asynchronous Processing (Don't Block the Thread) For tasks like sending emails or generating reports (or our 10-day auto-ghosting logic), don't make the user wait. Use @Async or a message queue like RabbitMQ to keep your API response times under 200ms. 3. Caching is Your Best Friend Before you upgrade your DigitalOcean droplets, implement Redis caching. Caching your most-viewed profiles or 'Walls' reduces database load by up to 80%. 4. Stateless Design Ensure your Java app is stateless so you can spin up multiple instances behind a load balancer without losing user sessions.