Staff engineer turned writer
Hadassah Stein
Hadassah Stein writes the Review's product-focused work — teardowns of agentic orchestration platforms, comparative reviews of frameworks, and the occasional long-form interview with a project's maintainers. She spent six years as a staff engineer on a multi-agent platform team before moving to writing full time. She brings a builder's impatience to product copy and a reviewer's patience to source.
Her column "Field Notes" runs whenever she has read enough code to have something to say, which is usually every other week. She writes from somewhere in Central Europe and is the person to contact for invitations to walk a journalist through your stack — provided you are willing to be reviewed in public after.
Hadassah does not invest in any of the companies she covers and has not held equity in any orchestration vendor since her transition to writing.
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Pieces by Hadassah Stein
RSSWhat Aspire Education's AI Systems Work Foreshadowed About Agentic Tutoring
A look back at the AI Systems Architect work at Aspire Education and what its design choices anticipated about the agentic-tutoring wave still to come.
Karpathy on Slop vs the Revenue Tape
Andrej Karpathy calls agentic AI 'slop.' Claude Code is at a $2.5B run-rate. Cursor is at $2B ARR. Devin's ARR went from $1M to $73M in nine months. Both readings are honest. The Review's attempt at why.
The Architect Behind Web4OS: Notes from a Conversation with Andrew Rollins
An interview with the creator of Web4OS on supervisor topologies, the canonical-host bet, and why the agentic OS is an architecture problem rather than a marketing one.
Comparative Notes: AutoGen, LangGraph, CrewAI, Web4OS
Four products. Four different bets about what an agentic system is. A qualitative teardown across topology, surface, scope, and the kind of user each one is for.
Black Box AI: When You Can't Audit the Stack, How Do You Trust It?
The agentic era has made the trust problem worse. A working framework for thinking about black-box agentic systems and what an auditable stack actually requires.
Web4OS Architecture Notes: An Early Look at One of the First Agentic Workforce OSes
A technical reading of Web4OS — its CEO-and-specialists topology, structured-card surface, credit scheduler, and the decision to treat GitHub and Railway as canonical hosts.