August 2026 » Alpesh Kumar

Design Uber’s AI Demand Prediction and Driver Repositioning System

Artificial Intelligence, Machine Learning, System Design

Design an Uber Demand Prediction and Driver Repositioning System

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AI Agent Frameworks Compared: Vercel AI SDK, LangGraph, CrewAI, AutoGen and LangChain — a framed comparison diagram visually separates streaming provider-flexible TypeScript output, branching and resumable orchestration, role-based collaboration, conversational agents, and modular integration building blocks, showing why framework selection follows architecture rather than a universal winner.

AI Agents, Artificial Intelligence, LangGraph

AI Agent Frameworks Compared: Vercel AI SDK, LangGraph, CrewAI, AutoGen and LangChain

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AI Watermarks Are Not a Silver Bullet: What Provenance Signals Can and Cannot Prove — a warm ivory technical diagram shows a media file with an embedded watermark band and a linked provenance record feeding an evidence tray, then stopping before separate source, context, and corroboration checks, representing that C2PA metadata and watermarks inform origin but cannot independently prove accuracy, ownership, or context. Visual direction: idea: provenance signals are useful evidence but stop short of editorial truth; subject: C2PA Content Credentials and embedded AI watermarking; mechanism: a media file carries an embedded watermark while a separate provenance record supplies origin/history information, both entering an evidence tray before a hard boundary requiring source, context, and corroborating-evidence checks; composition: landscape editorial explainer card with the exact headline in the upper third and a lower horizontal proof-boundary schematic; palette: warm ivory, ink charcoal, muted brick red, moss green, soft ochre, pale stone gray; exclusions: dark navy, neon-blue glow, floating UI cards, network nodes, generic AI circuitry, people, robots, hands, dashboards, physical-machine metaphors, decorative charts, logos, secondary readable text.

Artificial Intelligence

AI Watermarks Are Not a Silver Bullet: What Provenance Signals Can and Cannot Prove

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The UUID Primary Key Problem That Shows Up at 200 Million Rows — a framed technical comparison shows a random UUID B-tree scattering inserts and a point lookup fanning into many cold row pages, contrasted with a time-ordered UUID path that keeps inserts and fetched pages locally clustered. Visual direction: idea: a UUID primary-key lookup can find the key quickly yet still cause extreme page reads when random insertion order scatters the B-tree and cold row pages; subject: UUID primary keys at 200 million rows; mechanism: compare random UUID insert distribution across many B-tree leaf pages with time-ordered UUID inserts concentrated at the active edge, then show a point lookup descending the index and fanning out into scattered cold data pages marked by a dense 94,000-read texture; composition: framed comparison — a generous title band across the top, with a large left diagnostic zone for random UUID scatter and a right diagnostic zone for ordered UUID locality, joined only at the bottom by one shared lookup-to-row path; palette: deep forest/moss — pale eucalyptus background, forest-green and near-black ink, muted sandstone page blocks, restrained burnt-orange I/O accents, and a small burgundy warning accent; exclusions: dark navy, neon-blue glow, floating UI cards, network nodes, generic AI circuitry, people, robots, hands, dashboards, logos, fake code, secondary readable text, decorative charts, physical-machine metaphors

System Design

The UUID Primary Key Problem That Shows Up at 200 Million Rows

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“ Design is not just what it looks like and feels like. Design is how it works. “

Alpesh Kumar

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