The big picture

This track had no new mechanism. It was about the calls that turn everything you learned into one working system. You made six calls. Here they are on one page.

The story you just lived

It started with a school-fees app and a token in Maya's browser. Where do you put it? That is the BFF: the server holds the real tokens, and the browser gets only a session cookie. In identity across microservices, one food order crossed four services. You checked the user once at the edge. Then you passed narrow tokens over mutual TLS.

In multi-tenancy, a clinic system kept each clinic's data apart. The tenant claim guarded every read, list and write on the server. In token lifetimes, a short life plus fast revocation gave you safety and ease.

Then came the biggest call: build vs buy, for a food-delivery startup. Last, the 9 a.m. sale-day outage in when identity goes down. Graceful degradation, a health-checked standby and a break-glass door kept signed-in users working. An admin could still run the incident.

The threads that tie it together

One idea behind all of it

If one idea runs through every decision, it is zero trust: never assume, always verify, at every layer. NIST SP 800-207 says there is no implicit trust from network location alone.

Where to go next

This is the last track of the program, so there is no next track. Here is what to do, in order:

1. Read the cheat sheet and pop quiz. It is the last page before the hub.
2. Keep practicing with the Daily drill, the Flow Explorer and Challenge mode.
3. Take the Final Exam. It covers every track in this program and earns your certificate.
4. Practice on live systems in the Lab.
5. Start the second program, Practical AI, with AI from Zero.