I spent 8 months building two production-ready SaaS platforms while finishing my Master's thesis — here's what I learned

A bit of background: I'm a Master's student at SRH Heidelberg Here's what I actually built and what I learned. Stack: Node.js 18 / Express 5.1 / React 18.2 / MongoDB / What it does: full multi-tenant booking platform — think What I'm proud of: 940 passing tests (328 backend, 612 What hurt: I submitted to CodeCanyon and got hard-rejected 🔗 Bookify on Gumroad (€99) Stack: Spring Boot 3.2.4 / Java 21 / React 19 / MongoDB / What it does: full car rental system — vehicle browsing, What I learned bui