Reletter
Artwork for AI Superhero

AI engineering without the hype. I write about what I'm actually building: BERT in production, coding agents, LLM internals, and experiments that sometimes fail — and why.

Platform
Substack
PricingOnly free issuesPublishesWeekly
Issues29Foundeda year agoLast Issue7 days ago
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Latest Issues

How to Turn Your LLM into a Sleeper Agent

Joint work with Roy Benjamin, who sent me this paper and got me hooked.
Based on the paper - Watch your steps: Dormant Adversarial Behaviors that Activate upon LLM Finetuning

Imagine this: you download an open source model from HuggingFa...

7 days ago
1
1

How I Found My First Two SSRF CVEs

A week ago, I had zero CVEs to my name. Today I have two. The list is growing, and some bigger names are next.

I want to say this up front: I do not consider myself a security researcher. I am an AI engineer at Apiiro who is obsessed with...

a month ago
1

Stargazing Agent Skills in the Latent Space

We all know the standard RAG pattern. You take text, run it through an encoder, get a vector in a few hundred dimensions, and trust that "close in space" equals "close in meaning." That space sits invisibly between your tokenizer and your r...

a month ago
17
2

Training a Model Has Never Been Easier

By Shmulik Cohen & Sapir Tzabari

In 2026, it can be faster to create a dataset, train a local classifier, and integrate it into your product than waiting for a third-party provider to respond to a support ticket. That’s incredible. It’s al...

2 months ago
4

From Idea to Product with Claude Code

So much data, so little visualization

I’ve been on Substack for a while now, and one thing keeps striking me: there is so much interesting data behind every publication. Who your readers are, how they engage, who you’re connected to. Mo...

2 months ago
26
1

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Authors

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  • Shmulik Cohen | AI Superhero

    AI Engineer and Master's student with a passion for making complex technology accessible. I share practical guides, project insights, and curated tech developments to help you become your own AI Superhero

  • James Presbitero

    I design AI systems that turn founders into Unpromptable leaders, irreplaceable in the Age of AI. | Get the FREE AI Prompt Vault (prompts for writing, marketing, etc.) in the welcome email.

  • Sapir Tzabari

    Data Scientist with a background in Mathematics and Biomedical Engineering. Focused on machine learning, behavioral data, and real-world AI applications.

  • Roy Benjamin

    Applied Researcher exploring the intersection of technology and strategy. M.Sc. in Computer Science (Technion) and MBA candidate at Imperial College. Host of the "האותיות הקטנות" podcast. Focusing on Machine Learning, and the future of AI.

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