Week 102 — Cost/safety/caching

Production AI platform engineering · Implement

Hard

Phase 9 — Production AI platform engineering

Overview

Semantic/embedding cache, injection detection, cost attribution

Mode this week: implement. Match the work to that mode (operating model): implement ships running code; read/diagram ships a doc; deploy/benchmark ships a measured run. Personal dates, checkboxes, and the RPG layer stay in a learner journal.

Core deliverable

Cost/safety platform

• Gate 9 this week: Working production AI platform: router, quotas, tracing, logging, idempotency, work queue, model registry, cost attribution, safety filters

Optional depth

Add a production-shaped benchmark, cost or safety analysis, and an architecture trade-off note.

Week loop (from the cookiecutter journal)

• Mon — Theory: Semantic/embedding cache, injection detection, cost attribution
• Tue — Build: start the core deliverable above
• Wed — Systems / papers: one paper or system note (see below if this week has assigned reading)
• Thu — Eval / interview: write the four evidence items
• Fri — Algorithmic Forge: Euler Tour plus DSU-on-Tree subtree analytics, used as preparation for Capstone 2. (2-3 hr; Boss fight)

Forge theme: Week 102 - Platform tree boss

Leetcode Darbar (parallel)

This week's band (82-102): Heaps, priority queues, graphs, trees, range queries. Production connection: Inference schedulers, quotas, queues, tenant fairness.

Standard: one aligned problem. Auror: the five-slot queue on the Darbar page. Tracker stays in the learner journal.

Topics: graphs · heap · queue · range query · trees

• All Paths From Source To Target · medium · graphs
• The K Weakest Rows In A Matrix · easy · heap
• Implement Stack Using Queues · easy · queue
• Queue Reconstruction By Height · medium · range query
• Binary Tree Paths · easy · trees

Evidence contract

Every core week records all four (cookiecutter journal/weeks/week_102.md):

1. Code / implementation (or the design artifact on a writing week)
2. Benchmark / result
3. Design doc / technical explanation
4. Retrospective / learning note (Sailboat: destination, wind, anchor, rocks, heading)

On this site

• Problem catalog
• ML math

Official Tensor-to-Tenant

• Curriculum browser
• Milestone gates
• Weekly operating model
• Leetcode Darbar
• 36-week on-ramp
• Source repo

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