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Oliver Buchannon
Sid Arora

AI Case Study

This is How Perplexity Answers Your Questions

Jul 2, 2026

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3 min read

This is How Perplexity Answers Your Questions

Perplexity owns neither the models nor the content. Here's how that became a $22B strategy and why the open web is now suing it.

Sid Arora
Sid Arora

Simplifying AI

LLM-as-a-Judge: How One AI Grades Another (And When To Trust It)

Jun 29, 2026

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7 min read

LLM-as-a-Judge: How One AI Grades Another (And When To Trust It)

You can't human-review every AI output at scale. So you have one model grade another against a rubric. How LLM-as-a-judge works, and when to trust it.

Sid Arora
Sid Arora

Simplifying AI

The AI Flywheel: Why Some AI Products Become Viral

Jun 23, 2026

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5 min read

The AI Flywheel: Why Some AI Products Become Viral

Why do some AI products get smarter the more they are used, while others stall? It's because of the data flywheel: the loop that separates a feature from a moat.

Sid Arora
Sid Arora
How Uber Built an AI That Reviews PRDs Before Humans Do

Jun 17, 2026

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5 min read

How Uber Built an AI That Reviews PRDs Before Humans Do

Uber built an AI "PRD Evaluator" that assembles company-wide context to pressure-test product docs before human review. Here's how the system works.

Sid Arora
Sid Arora

fundamentals

What Is Context Rot And Why Your AI Gets Dumber The Longer You Talk to It

Jun 12, 2026

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5 min read

What Is Context Rot And Why Your AI Gets Dumber The Longer You Talk to It

Bigger context windows didn't fix AI quality but made it easier to overload the model without noticing. Here's what context rot is, why it happens, and the TRIM framework to fix it.

Sid Arora
Sid Arora
Learn Claude Code (For Free, Without Coding Experience)

Jun 10, 2026

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3 min read

Learn Claude Code (For Free, Without Coding Experience)

I've spent the last 6 months diving deep into building with Claude Code. And now I've created a FREE course that teaches you Claude Code inside Claude Code.

Sid Arora
Sid Arora

Simplifying AI

What Is Synthetic Data And Why Is It Replacing Human Labelling?

May 25, 2026

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4 min read

What Is Synthetic Data And Why Is It Replacing Human Labelling?

Most AI training data is no longer written by humans. Synthetic data, generated by AI models, is faster, cheaper, and often better. Here's how it works.

Sid Arora
Sid Arora

AI Case Study

Airbnb Replaced Press 1 With Four ML Models That Actually Listen

May 18, 2026

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5 min read

Airbnb Replaced Press 1 With Four ML Models That Actually Listen

Airbnb replaced rigid phone menus with four ML models running in real time: ASR, intent detection, semantic retrieval, and paraphrasing. WER dropped from 33% to 10%.

Sid Arora
Sid Arora
What Is LLM Routing, And When Should You Use Multiple Models?

May 11, 2026

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5 min read

What Is LLM Routing, And When Should You Use Multiple Models?

Not every request needs your most expensive model. LLM routing sends simple tasks to cheap models and hard ones to smart ones, cutting costs 30-70%.

Sid Arora
Sid Arora

AI Case Study

How Netflix Turns Generic LLMs into Recommendation Engines

May 6, 2026

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7 min read

How Netflix Turns Generic LLMs into Recommendation Engines

Netflix's recommendation engine drives 80% of viewing. Here's how they built a post-training framework to adapt LLMs for their catalogue from SFT to RL.

Sid Arora
Sid Arora
7 AI Agents Write This Newsletter

Apr 30, 2026

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7 min read

7 AI Agents Write This Newsletter

I built a 7-agent AI pipeline that writes my newsletter (JustAnotherPM) in 45 minutes instead of 8 hours. Here’s the full system, design decisions, and lessons learned.

Sid Arora
Sid Arora

Simplifying AI

How Do LLMs Actually Learn To Be Helpful? A PM's Guide To Post-Training

Apr 27, 2026

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5 min read

How Do LLMs Actually Learn To Be Helpful? A PM's Guide To Post-Training

Pre-training makes a model smart. Post-training makes it useful. Here's how SFT, RLHF, DPO, and Constitutional AI work, explained for PMs.

Sid Arora
Sid Arora

Simplifying AI

Prompt Caching Can Cut Your LLM Bill by 70%. Here's What it Does

Apr 24, 2026

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5 min read

Prompt Caching Can Cut Your LLM Bill by 70%. Here's What it Does

Prompt caching doesn't cache the answer. It caches the question. Here's how it works, what it costs, and how teams are cutting down their LLM bills.

Sid Arora
Sid Arora
Evals Are The New PRD

Apr 22, 2026

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7 min read

Evals Are The New PRD

Evals are replacing PRDs as the primary spec for AI products. Here's why — and how to cover single-turn, multi-turn, and agent evals in 2026.

Sid Arora
Sid Arora

Simplifying AI

What are Managed Agents by Claude?

Apr 20, 2026

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6 min read

What are Managed Agents by Claude?

Anthropic's agent containers kept dying. So they borrowed from OS design and cut latency by 90%. Inside the Managed Agents architecture.

Sid Arora
Sid Arora

AI Case Study

Stripe and OpenAI Killed the Checkout Page

Apr 18, 2026

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4 min read

Stripe and OpenAI Killed the Checkout Page

Stripe and OpenAI co-built ACP, an open standard for AI agents to make purchases. It already powers Instant Checkout in ChatGPT. Here's how it works.

Sid Arora
Sid Arora

Simplifying AI

What is Claude Channels and How Does It Work?

Apr 15, 2026

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9 min read

What is Claude Channels and How Does It Work?

Claude Channels lets external systems push events into a live Claude Code session. Here's what it is, how it works, and why it matters for AI product teams.

Sid Arora
Sid Arora

fundamentals

What Is Agentic RAG And Why Regular RAG Isn't Enough Anymore

Apr 13, 2026

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12 min read

What Is Agentic RAG And Why Regular RAG Isn't Enough Anymore

Classic RAG retrieves once and generates. Agentic RAG retrieves in loops, checks what it found, and goes back for more. Here's what that means for the AI products.

Sid Arora
Sid Arora

Simplifying AI

WTF Is The Difference Between Claude, Claude Code, Claude Cowork

Apr 6, 2026

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8 min read

WTF Is The Difference Between Claude, Claude Code, Claude Cowork

Anthropic now has three products called Claude. One is a chatbot, one writes your code, and one manages your files. Here's how they're different and when to use each.

Sid Arora
Sid Arora

case study

Snapchat Built Stories, but Lost the Game While Others Won

Apr 3, 2026

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12 min read

Snapchat Built Stories, but Lost the Game While Others Won

Zuckerberg even offered $3 billion to buy it. Spiegel said no. Here's the rise, the copy, and the decade-long search for a second act.

Sid Arora
Sid Arora

ai

Everything You Must Know About Mixture of Experts (MoE)

Apr 1, 2026

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12 min read

Everything You Must Know About Mixture of Experts (MoE)

Mixture of Experts (MoE) is the architecture behind GPT-4, Gemini 1.5, and Mixtral. Here's a PM-level explanation of how MoE works and why it matters for your API budget.

Sid Arora
Sid Arora
Grab Does Personalisation For Millions In Under 15 Seconds

Mar 30, 2026

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11 min read

Grab Does Personalisation For Millions In Under 15 Seconds

Grab's personalisation ran on one day old data. Here's how they rebuilt it to react in under 15 seconds — with no engineering required for each new use case.

Sid Arora
Sid Arora
Why Is Spotify Using 6 AI Agents For Building Ad Campaigns (Instead of Using Only One)?

Mar 27, 2026

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12 min read

Why Is Spotify Using 6 AI Agents For Building Ad Campaigns (Instead of Using Only One)?

Spotify's ad planning took 30 minutes and 20+ form fields. Here's how six AI agents cut it to 10 seconds, and what the architecture actually looks like.

Sid Arora
Sid Arora
Claude Just Changed The Vibe Coding Game

Mar 23, 2026

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10 min read

Claude Just Changed The Vibe Coding Game

Claude launched "Channels" allowing vibe coders to continue coding without being on their systems. This is how it works.

Sid Arora
Sid Arora

case study

How Did Notion Win The Productivity Battle?

Mar 20, 2026

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11 min read

How Did Notion Win The Productivity Battle?

Notion reached a $10 billion valuation on just $344 million raised. Here's how a free personal tier and an accidental template ecosystem became its growth engine.

Sid Arora
Sid Arora
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