Marcin Firmuga

Hey, I'm Marcin (22, PL 🇵🇱). A year building PC Workman in public, an offline-AI Windows monitor, now on the Microsoft Store. Real updates, brutal failures, tiny wins :)

Poland Joined on Jan 4, 2026 https://linktr.ee/marcin_firmuga

Education

Technical School - IT Specialist

Work

HCK Labs / PC Workman - Open to Work

Marcin Firmuga

Aug 10

The bug that passes every test and does nothing. I let an AI write more than I read, and the tests that would have caught all of it.

#programming #testing #ai #career

7 min read

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Marcin Firmuga

Jul 24

I Had a 6,533-Line Python Response Builder. It Still Worked. That Was the Problem.

#python #architecture #opensource #refactoring

10 min read

Marcin Firmuga

Jul 19

From a Warehouse Floor to the Microsoft Store - PC Workman Marcin Firmuga

#python #opensource #ai #career

10 min read

Marcin Firmuga

Jun 29

The Man Who Got Himself Back - Marcin HCK Firmuga

#python #ai #opensource #github

10 min read

Marcin Firmuga

Jun 16

Your PC Monitor Shows Numbers. It Should Understand Your Machine - Marcin Firmuga

#buildinpublic #ai #python #opensource

10 min read

Marcin Firmuga

Jun 5

I Was Supposed to Fix Bugs. I Accidentally Built Two Features Instead. PC Workman 1.7.8 - Advanced Deep Learning AI, Supply Monitor and Health Keeper.

#python #ai #opensource #programming

7 min read

Marcin Firmuga

May 28

I Built an AI-Powered PC Monitor in Python. 28 Strangers Shaped Its Brain. PC Workman 1.7.6

#ai #python #opensource #programming

7 min read

Marcin Firmuga

May 12

How I Taught My Offline AI to Remember, Watch, and Warn, Without Any Cloud (Part 2)

#python #ai #tutorial #opensource

9 min read

A 5-step decision chain for two languages

Marcin Firmuga

May 3

How I Built an Offline AI Assistant in Python - No OpenAI, No LangChain, No Dependencies

#python #ai #tutorial #opensource

9 min read

Marcin Firmuga

Apr 28

Why I Sign Every .exe With Sigstore - PC Workman v1.7.2 Release, Security-First Open Source

#programming #python #opensource #ai

7 min read

Marcin Firmuga

Apr 16

Wednesday Code Autopsy #4: The Canvas Arc Nobody Uses - PC Workman

#python #buildinpublic #opensource #github

5 min read

Marcin Firmuga

Apr 13

PC Workman v1.7.2: I Built a Driver Booster Competitor From Scratch, Fixes. Monday Grind Blueprint #3

#buildinpublic #python #opensource #programming

10 min read

Marcin Firmuga

Apr 10

Friday Shipped & Scarred #3: PC Workman 1.7.1, The Foundation Great Release

#python #programming #github #opensource

7 min read

Marcin Firmuga

Apr 6

Monday Grind Blueprint #2: 80 Processes Explained, 3 Issues Targeted, 1 Week to Ship

#python #opensource #buildinpublic #devops

7 min read

Marcin Firmuga

Mar 27

Friday Shipped & Scarred #1: The Day git --force Deleted 130 PC Workman Commits (I Got 90 Back)

#git #buildinpublic #opensource #python

5 min read

Marcin Firmuga

Mar 25

Code Autopsy #1: How ~90 Lines Turned System Monitoring Into A Conversation

#python #opensource #buildinpublic #ai

5 min read

Marcin Firmuga

Mar 18

PC_Workman: Building a System Monitor for Microsoft Store

#programming #python #javascript #microsoft

3 min read

Marcin Firmuga

Feb 22

PC_Workman 1.6.8: When "Quick Fix" Took 3 Weeks (Data Engine + AI Context + 70% Performance)

#showdev #python #opensource #buildinpublic

12 min read

Marcin Firmuga

Feb 15

How to Sign Your Python .exe With Sigstore (No Certificate Required)

#security #python #opensource #tutorial

5 min read

Marcin Firmuga

Feb 5

How I built an AI Manual Assistant between warehouse shifts (and why it hallucinated about charcoal)

#showdev #programming #react #ai

3 min read

Marcin Firmuga

Jan 22

My Two Best Teammates Have Four Paws. And They Keep Me Sane While Coding

#programming #python #opensource #sideprojects

4 min read

Marcin Firmuga

Jan 21

How I Verify PC Workman Security Before Every exe Release

#programming #ai #python #devops

4 min read

Marcin Firmuga

Jan 20

PC_Workman v1.6.3+: From Code to Executable .exe after 6 months of work. My milestone.

#programming #software #ai #python

3 min read

Marcin Firmuga

Jan 17

The Night I Stopped Building For Myself.

#programming #buildinpublic #startup #sideprojects

7 min read

Marcin Firmuga

Jan 14

Budowałem przez 5 miesięcy, build-in-public. Nikt nie patrzył. 22 grudnia mnie zwolnili.

#buildinpublic #python #opensource #programming

4 min read

Marcin Firmuga

Jan 12

PC_Workman v1.6.1 UI Refinement: From Clutter to Density in One Night

#buildinpublic #python #uidesign #opensource

1 min read

Marcin Firmuga

Jan 10

From School Websites to Something Real: The Day PC_Workman Got Its First Dedicated Home

#buildinpublic #programming #opensource #ai

3 min read

Marcin Firmuga

Jan 5

I Built in Public for 5 Months. Nobody Watched. 22nd Dec. I Got Fired.

#beginners #programming #career #python

4 min read

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Marcin Firmuga

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The bug that passes every test and does nothing. I let an AI write more than I read, and the tests that would have caught all of it.

Want to connect with Marcin Firmuga?

I Had a 6,533-Line Python Response Builder. It Still Worked. That Was the Problem.

From a Warehouse Floor to the Microsoft Store - PC Workman Marcin Firmuga

The Man Who Got Himself Back - Marcin HCK Firmuga

Your PC Monitor Shows Numbers. It Should Understand Your Machine - Marcin Firmuga

I Was Supposed to Fix Bugs. I Accidentally Built Two Features Instead. PC Workman 1.7.8 - Advanced Deep Learning AI, Supply Monitor and Health Keeper.

I Built an AI-Powered PC Monitor in Python. 28 Strangers Shaped Its Brain. PC Workman 1.7.6

How I Taught My Offline AI to Remember, Watch, and Warn, Without Any Cloud (Part 2)

How I Built an Offline AI Assistant in Python - No OpenAI, No LangChain, No Dependencies

Why I Sign Every .exe With Sigstore - PC Workman v1.7.2 Release, Security-First Open Source

Wednesday Code Autopsy #4: The Canvas Arc Nobody Uses - PC Workman

PC Workman v1.7.2: I Built a Driver Booster Competitor From Scratch, Fixes. Monday Grind Blueprint #3

Friday Shipped & Scarred #3: PC Workman 1.7.1, The Foundation Great Release

Monday Grind Blueprint #2: 80 Processes Explained, 3 Issues Targeted, 1 Week to Ship

Friday Shipped & Scarred #1: The Day git --force Deleted 130 PC Workman Commits (I Got 90 Back)

Code Autopsy #1: How ~90 Lines Turned System Monitoring Into A Conversation

PC_Workman: Building a System Monitor for Microsoft Store

PC_Workman 1.6.8: When "Quick Fix" Took 3 Weeks (Data Engine + AI Context + 70% Performance)

How to Sign Your Python .exe With Sigstore (No Certificate Required)

How I built an AI Manual Assistant between warehouse shifts (and why it hallucinated about charcoal)

My Two Best Teammates Have Four Paws. And They Keep Me Sane While Coding

How I Verify PC Workman Security Before Every exe Release

PC_Workman v1.6.3+: From Code to Executable .exe after 6 months of work. My milestone.

The Night I Stopped Building For Myself.

Budowałem przez 5 miesięcy, build-in-public. Nikt nie patrzył. 22 grudnia mnie zwolnili.

PC_Workman v1.6.1 UI Refinement: From Clutter to Density in One Night

From School Websites to Something Real: The Day PC_Workman Got Its First Dedicated Home

I Built in Public for 5 Months. Nobody Watched. 22nd Dec. I Got Fired.