Zentosys Elite Internship Primer: Only for the Gritty & Gifted

Welcome to the elite-level Zentosys Internship Challenge. This is not your average internship. We're looking for those who get excited about debugging complex API issues and containerizing apps for fun.

Forget about degrees—we care about your ability to dive deep and learn fast. This primer will test your limits across JavaScript, Node.js, Express, NestJS, Docker, Render, and PostgreSQL.

Ready to build real-world backend systems? Don't just read—build, test, and think deeply. Only the truly exceptional move forward.

🚨 Prep Before You Apply

Before applying for the Zentosys Internship Challenge, make sure you:

• Read this primer end to end
• Try to understand and build every code snippet
• Attempt at least 2 Final Challenge Prompts

⚠️ The interview will be based entirely on this primer. We’ll ask you to explain architecture choices, debug logic, and show how you think.

📌 This is your only preparation checklist:

• [ ] Have you written and tested the example code?
• [ ] Did you Google the things you didn’t know?
• [ ] Did you challenge yourself to go deeper?

💡 If you're applying without doing this, the interview will be tough. But if you’re built for this — you’ll love every minute of it.

1. JavaScript Mastery