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For applications expecting 100K+ concurrent users, Spring's mature JVM runtime, garbage collection optimization, and connection pooling provide superior capacity. NestJS excels at lower traffic volumes and real-time features via WebSockets."},{"question":"Is NestJS production-ready for enterprise applications?","answer":"Yes, NestJS is production-ready and used by companies like Adidas, Uber, and Accenture. However, Spring remains the industry standard for mission-critical systems due to 20+ years of real-world battle-testing, larger community (78K jobs vs 24K), and more extensive third-party integrations. NestJS works well for enterprise microservices, APIs, and internal tools but lacks the breadth of production-hardened libraries that Spring offers."},{"question":"Which has a larger job market and better career prospects?","answer":"Spring dominates the job market with approximately 78,000 active positions (2024) compared to 24,000 for NestJS—a 3.3x difference. 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NestJS offers a lighter footprint (~100 MB vs 350 MB), faster startup times (~300 ms vs 2,500 ms), and lower infrastructure costs per service—ideal for Kubernetes deployments with 50+ microservices. Spring provides better observability, distributed tracing (Spring Cloud), and larger libraries for service-to-service communication. 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