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Stop Guessing. Let the Algorithm Find the Sweet Spot.

Don Johnson

Oct 15

Stop Guessing. Let the Algorithm Find the Sweet Spot.

#programming #algorithms #rust #performance

16 reactions

I Put Jev Behind a TLA+ Spec and Ran 1,680 Chaos-Tested Pharmacy Decisions. Zero Wrong Verdicts.

10 min read

Evidence-Driven Development: Give Your Coding Agent Something to Prove

Don Johnson

Oct 10

Evidence-Driven Development: Give Your Coding Agent Something to Prove

#ai #testing #tutorial #python

16 reactions

9 comments

9 min read

Vibe Was Never the Problem: The Missing Half of Vibe Coding

Roots in fire-commander intuition

Don Johnson

Sep 25

Vibe Was Never the Problem: The Missing Half of Vibe Coding

#discuss #ai #vibecoding #programming

35 reactions

7 comments

10 min read

Don Johnson

Sep 19

I Put Jev Behind a TLA+ Spec and Ran 1,680 Chaos-Tested Pharmacy Decisions. Zero Wrong Verdicts.

#jev #ai #rust #testing

5 reactions

5 min read

Algorithmic Trading: Debug Your Backtest Before Upgrading Your Model

Don Johnson

Sep 17

Algorithmic Trading: Debug Your Backtest Before Upgrading Your Model

#python #machinelearning #testing #ai

14 reactions

2 comments

7 min read

The Agent Said It Worked. I Asked the Kernel.

Seeding eight behaviors to test the verifier first

Don Johnson

Sep 15

The Agent Said It Worked. I Asked the Kernel.

#ai #linux #debugging #programming

13 reactions

9 comments

10 min read

I Interviewed an Executable. It Had Notes.

Don Johnson

Sep 12

I Interviewed an Executable. It Had Notes.

#security #ai

9 reactions

6 min read

Someone Spammed My DEV Post. I Traced It to a Wombat.

Math shows three annual signups fund it

Don Johnson

Sep 10

Someone Spammed My DEV Post. I Traced It to a Wombat.

#discuss #cybersecurity #security

41 reactions

11 comments

14 min read

BattleBots, but the robot is your agent harness

Don Johnson

Sep 3

BattleBots, but the robot is your agent harness

#showdev #ai #rust #gamedev

2 comments

7 min read

Migrating Legacy LLM Infrastructure to an AI Gateway

Real cost results and leaked key pain points

Don Johnson

Sep 1

Migrating Legacy LLM Infrastructure to an AI Gateway

#ai #llm #devops #tutorial

20 reactions

6 min read

636 Bytes: What Happens When You Stop Teaching RPA the Path

Don Johnson

Aug 28

636 Bytes: What Happens When You Stop Teaching RPA the Path

#ai #webassembly #automation #rust

My agent mesh could coordinate. It couldn't introduce itself. So I added A2A.

5 min read

Transactional outbox challenges for tasks

Don Johnson

Aug 26

My agent mesh could coordinate. It couldn't introduce itself. So I added A2A.

#ai #agents #architecture #distributedsystems

8 reactions

5 comments

10 min read

A Wider Computer, Not a Bigger One: Modeling AI Inference Across Millions of Homes

Unexpected dropouts drive up compute costs

Don Johnson

Aug 25

A Wider Computer, Not a Bigger One: Modeling AI Inference Across Millions of Homes

#ai #aiops #infrastructure

15 reactions

My QUIC transport had never once been executed. Here's what happened when I ran it.

8 min read

Uncovers latent bugs and flawed core semantics

Don Johnson

Aug 19

My QUIC transport had never once been executed. Here's what happened when I ran it.

#rust #distributedsystems #networking #ai

12 reactions

8 min read

Shipping Assumptions: A Reliability Stack for AI-Generated Code

Locally plausible code hides global system risks

Don Johnson

Aug 16

Shipping Assumptions: A Reliability Stack for AI-Generated Code

#ai #architecture #testing #programming

27 reactions

10 comments

7 min read

Write down every guarantee before you write any code

Formal specs beat scattered tests

Don Johnson

Aug 11

Write down every guarantee before you write any code

#ai #rust #formalmethods #testing

19 reactions

4 comments

11 min read

The Shape of Failure: Before You Blame the AI

Don Johnson

Aug 1

The Shape of Failure: Before You Blame the AI

#ai #testing #python #softwaredevelopment

7 min read

I Had a Lot of Fun Building a Linux Packet Flight Recorder

Uses Rust and eBPF to replay kernel packet paths

Don Johnson

Jul 28

I Had a Lot of Fun Building a Linux Packet Flight Recorder

#linux #networking #ai #devops

25 reactions

7 min read

389 Tests Passed. NIST Still Caught the Bug.

NIST validation exposes limits of unit tests

Don Johnson

Jul 25

389 Tests Passed. NIST Still Caught the Bug.

#ai #testing #tooling #rust

21 reactions

13 comments

7 min read

Give Your Coding Agent a Deterministic Vulnerability Oracle

Don Johnson

Jul 21

Give Your Coding Agent a Deterministic Vulnerability Oracle

#ai #security #devsecops #tooling

15 reactions

8 min read

The Last Honest Abstraction: Why AI Coding Isn't the End of Engineering

Don Johnson

Jul 17

The Last Honest Abstraction: Why AI Coding Isn't the End of Engineering

#discuss #ai #programming #softwaredevelopment

17 reactions

A Vibe Is Not a Verdict: I Built a Tool That's Allowed to Say 'I Don't Know'

5 min read

Rust CLI for vetting suspicious links

Don Johnson

Jul 13

A Vibe Is Not a Verdict: I Built a Tool That's Allowed to Say 'I Don't Know'

#ai #rust #cli #security

29 reactions

15 comments

7 min read

The AI Cost-Modeling Handbook: I let Claude do the modeling, but never the arithmetic

Don Johnson

Jul 1

The AI Cost-Modeling Handbook: I let Claude do the modeling, but never the arithmetic

#ai #llm #costoptimization #agents

11 min read

AI Didn't Invent Slop. It Only Made It Infinite.

The shift from writing to vetting code

Don Johnson

Jun 27

AI Didn't Invent Slop. It Only Made It Infinite.

#discuss #ai #career #codequality

9 comments

10 min read

Cogs and Sparks: Who Wins When Machines Learn to Speak Human

Don Johnson

Jun 13

Cogs and Sparks: Who Wins When Machines Learn to Speak Human

#discuss #ai #career #programming

7 min read

Stop Feeding Agents Raw Data

Separating measurement from reasoning

Don Johnson

Jun 9

Stop Feeding Agents Raw Data

#ai #rust #agents #data

13 reactions

8 comments

6 min read

The Container Runtime Nobody Told You About (And Four Others)

Don Johnson

May 26

The Container Runtime Nobody Told You About (And Four Others)

#docker #go #devops #security

The Linux Commands You Forgot Exist (And Why AI Workflows Make Them Relevant Again)

9 min read

Don Johnson

May 25

The Linux Commands You Forgot Exist (And Why AI Workflows Make Them Relevant Again)

#linux #productivity #automation #ai

The git Commands You Forgot Exist (And Why AI Workflows Make Them Relevant Again)

5 min read

Don Johnson

May 25

The git Commands You Forgot Exist (And Why AI Workflows Make Them Relevant Again)

#ai #claude #agentskills

Care Compass: Pairing Gemma 4 With Signed Policy Evidence for Healthcare Navigation

4 min read

Gemma 4 Challenge: Build With Gemma 4 Submission

Don Johnson

May 20

Care Compass: Pairing Gemma 4 With Signed Policy Evidence for Healthcare Navigation

#devchallenge #gemmachallenge #gemma #healthcare

9 reactions

6 min read

AI Tools Need Contracts, Not Prompts

Don Johnson

May 19

AI Tools Need Contracts, Not Prompts

#ai #cli #devtools #rust

9 reactions

Beautifully Broken: AI Is Not Creating the Vulnerability Crisis. It Is Collecting the Tax.

10 min read

Don Johnson

May 3

Beautifully Broken: AI Is Not Creating the Vulnerability Crisis. It Is Collecting the Tax.

#ai #programming #webdev

A Truth Filter for AI-Generated Ideas: An Experiment with Property-Based Testing

8 min read

A Truth Filter for AI Output: An Experiment with Property-Based Testing

Mr. 0x1

Apr 19

A Truth Filter for AI Output: An Experiment with Property-Based Testing

#testing #rust #ai #tutorial

2 comments

15 min read

Mr. 0x1

Apr 19

A Truth Filter for AI-Generated Ideas: An Experiment with Property-Based Testing

#testing #rust #ai #tutorial

We Ran Four Security Tools Against Express.js. They Found Each Other's Proof.

15 min read

Don Johnson

Apr 12

We Ran Four Security Tools Against Express.js. They Found Each Other's Proof.

#security #javascript #node #devsecops

4 reactions

9 min read

I Asked My AI Agent About axios. It Knew Everything in 0.03ms.

Don Johnson

Apr 5

I Asked My AI Agent About axios. It Knew Everything in 0.03ms.

#security #mcp #ai #vulnerabilities

We Built a Financial Solver That Protects Jobs. Then We Tried to Break It 1.1 Billion Times.

4 min read

Don Johnson

Apr 4

We Built a Financial Solver That Protects Jobs. Then We Tried to Break It 1.1 Billion Times.

#rust #webassembly #testing #fintech

8 min read

I Built a Stream Processor That Only Recomputes What Changed

Don Johnson

Mar 25

I Built a Stream Processor That Only Recomputes What Changed

#ocaml #distributedsystems #streamprocessing #performance

3 reactions

Fuck Around and Find Out: How a $6.99 Phishing Scam Got 1.2 Million Fake Victims

6 min read

Don Johnson

Mar 20

Fuck Around and Find Out: How a $6.99 Phishing Scam Got 1.2 Million Fake Victims

#security #rust #reverseengineering #phishing

5 reactions

I Got Sick of Getting Rugged, So I Built a Rug-Pull Detection Engine in Rust

7 min read

Don Johnson

Mar 9

I Got Sick of Getting Rugged, So I Built a Rug-Pull Detection Engine in Rust

#rust #security #blockchain #webdev

4 reactions

6 min read

How I Found $300,000 Worth of Secrets in a Download Button

Don Johnson

Feb 4

How I Found $300,000 Worth of Secrets in a Download Button

#security #javascript #webdev

I Replaced My LLM Orchestrator with Plant Biology — Here's What Happened

5 min read

Don Johnson

Jan 20

I Replaced My LLM Orchestrator with Plant Biology — Here's What Happened

#rust #ai #osint #cybersecurity

Optimizing LLM Context Windows: Reducing Token Usage by 40% with TOON and Rust

4 min read

Mr. 0x1

Jan 17

Optimizing LLM Context Windows: Reducing Token Usage by 40% with TOON and Rust

#rust #ai #performance

4 min read

The Infinite Buffer: Why AI Agents Are Rebuilding the Lisp Machine

Don Johnson

Jan 13

The Infinite Buffer: Why AI Agents Are Rebuilding the Lisp Machine

#ai #emacs #zig #productivity

5 reactions

3 min read

I Asked My Dog How Trees Talk. Now I'm Rethinking LLM Orchestration.

Don Johnson

Jan 6

I Asked My Dog How Trees Talk. Now I'm Rethinking LLM Orchestration.

#rust #llm #distributedsystems #opensource

3 reactions

5 min read

I wrote a Vibe Check for your code (Runs on a Potato 🥔)

Mr. 0x1

Dec 29 '25

I wrote a Vibe Check for your code (Runs on a Potato 🥔)

#zig #cli #devops #humor

Project Corsa: The Untold Story of TypeScript 7 (A Git Forensic Thriller)

2 min read

Don Johnson

Dec 27 '25

Project Corsa: The Untold Story of TypeScript 7 (A Git Forensic Thriller)

#typescript #go #webdev #performance

5 min read

Doc-First Development: Because 'We'll Document It Later' Is a Lie

Mr. 0x1

Dec 26 '25

Doc-First Development: Because 'We'll Document It Later' Is a Lie

#go #testing #openapi #architecture

5 min read

When I Took Numba to the Dojo: A Battle Royale Against Rust and CUDA

Don Johnson

Dec 26 '25

When I Took Numba to the Dojo: A Battle Royale Against Rust and CUDA

#python #rust #cuda #performance

Building a Blazing Fast CI Engine in Rust (That Dogfoods Itself!) 🦀⚡

5 min read

Don Johnson

Dec 25 '25

Building a Blazing Fast CI Engine in Rust (That Dogfoods Itself!) 🦀⚡

#rust #devops #engineering

2 min read

VOPR: The Multiverse Machine That Kills Production Bugs

Mr. 0x1

Dec 24 '25

VOPR: The Multiverse Machine That Kills Production Bugs

#testing #distributedsystems #zig #programming

The Most Underrated Tool in Your Dev Toolbox: Pre-Commit Hooks (Yes, That 20-Year-Old Git Feature)

10 min read

Don Johnson

Dec 14 '25

The Most Underrated Tool in Your Dev Toolbox: Pre-Commit Hooks (Yes, That 20-Year-Old Git Feature)

#devops #software #webdev #programming

4 min read

Death by 1,000 Defaults: The Slow-Motion Car Crash Nobody Saw Coming

Don Johnson

Dec 6 '25

Death by 1,000 Defaults: The Slow-Motion Car Crash Nobody Saw Coming

#performance #devops #architecture #cost

4 min read

Intent-Driven Development: Define the System Before You Write the Code

Don Johnson

Dec 4 '25

Intent-Driven Development: Define the System Before You Write the Code

#softwaredevelopment #architecture #ai #methodology

4 reactions

A data-driven look at "The Vibe Tax" and why technical debt might not be AI's fault.

5 min read

Don Johnson

Dec 1 '25

A data-driven look at "The Vibe Tax" and why technical debt might not be AI's fault.

#ai #programming

2 comments

5 min read

The Art, the Politics, and the Final Truth of Software Development

Don Johnson

Nov 24 '25

The Art, the Politics, and the Final Truth of Software Development

#software #ai

3 min read

Cult of Tiger

Don Johnson

Oct 31 '25

Cult of Tiger

#distributedsystems #programming #ai #systems

Personas Are the Missing Link in Your Requirements Docs (and Test Strategy)

3 min read

Don Johnson

Oct 30 '25

Personas Are the Missing Link in Your Requirements Docs (and Test Strategy)

#documentation #software #ai