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Notes from the classroom

Engineering tutorials, placement playbooks, and lessons from running 200+ cohorts. Written by working engineers — no fluff, no SEO bait.

New post every week · Engineering, DS, Placements
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Why we replaced REST with tRPC for cohort dashboards
Full Stack

Why we replaced REST with tRPC for cohort dashboards

Six months ago we ripped out 14 REST endpoints. Here's the type-safety dividend, the cold-start gotcha, and the migration plan that didn't break a single learner login.

Aarav Mehta
24 Apr 2026 · 8 min read
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A no-magic intro to embeddings for engineers who never took ML
Data Science

A no-magic intro to embeddings for engineers who never took ML

If you can grok dot products, you can grok embeddings. Build a movie-recommender from scratch in 60 lines — no PyTorch, no TensorFlow, no jargon.

Priya Iyer
12 Apr 2026 · 11 min read
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What 900 hiring partners actually look for in your portfolio
Placements

What 900 hiring partners actually look for in your portfolio

We surveyed our recruiter network. The result is uncomfortable: most learners spend their portfolio time on the wrong things. Here's what to swap in.

Riya Khanna
02 Apr 2026 · 6 min read
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You can probably do system design on two Postgres tables
Engineering

You can probably do system design on two Postgres tables

Most senior-level system-design interviews don't require Kafka, Redis Streams, or Cassandra. Two well-shaped Postgres tables get you 80% of the way there.

Vikram Bose
21 Mar 2026 · 9 min read
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The one-page resume template recruiters actually read
Career

The one-page resume template recruiters actually read

After reviewing 5,000+ resumes from our cohorts, the pattern is clear. Most candidates are fighting their template. Here is the layout that wins consistently.

Riya Khanna
08 Mar 2026 · 5 min read
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Shipping LLM features without burning your monthly cloud bill
AI tooling

Shipping LLM features without burning your monthly cloud bill

Practical patterns we use in production to keep LLM costs under 4% of revenue: caching, model routing, evals, and the one habit nobody talks about.

Devansh Rao
24 Feb 2026 · 10 min read
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