Alex Sinner
@sinner.lu
Human. Likes Graphic Novels, Metal, and Cheese. Professional Geek no longer at AWS. From Luxembourg. Opinions my own.
I just completed "Cafeteria" - Day 5 - Advent of Code 2025 #AdventOfCode adventofcode.com/2025/day/5
This one was a bit painful, but no pain no gain! #AdventofCode
This one was a bit painful, but no pain no gain! #AdventofCode
Day 5 - Advent of Code 2025
adventofcode.com
December 5, 2025 at 3:49 PM
I just completed "Cafeteria" - Day 5 - Advent of Code 2025 #AdventOfCode adventofcode.com/2025/day/5
This one was a bit painful, but no pain no gain! #AdventofCode
This one was a bit painful, but no pain no gain! #AdventofCode
I just completed "Printing Department" - Day 4 - Advent of Code 2025 #AdventOfCode adventofcode.com/2025/day/4
It helped to have a matrix helper class from last year's AoC :)
It helped to have a matrix helper class from last year's AoC :)
Day 4 - Advent of Code 2025
adventofcode.com
December 4, 2025 at 10:46 AM
I just completed "Printing Department" - Day 4 - Advent of Code 2025 #AdventOfCode adventofcode.com/2025/day/4
It helped to have a matrix helper class from last year's AoC :)
It helped to have a matrix helper class from last year's AoC :)
I just completed "Lobby" - Day 3 - Advent of Code 2025 #AdventOfCode adventofcode.com/2025/day/3
With the right approach, this one was reasonably straightforward. :)
With the right approach, this one was reasonably straightforward. :)
Day 3 - Advent of Code 2025
adventofcode.com
December 3, 2025 at 1:23 PM
I just completed "Lobby" - Day 3 - Advent of Code 2025 #AdventOfCode adventofcode.com/2025/day/3
With the right approach, this one was reasonably straightforward. :)
With the right approach, this one was reasonably straightforward. :)
I just completed "Gift Shop" - Day 2 - Advent of Code 2025 #AdventOfCode adventofcode.com/2025/day/2
I did not manage to finish yesterday, but slowly getting back up to speed. This year I am also publishing my code on GitHub github.com/alexsinner/a...
I did not manage to finish yesterday, but slowly getting back up to speed. This year I am also publishing my code on GitHub github.com/alexsinner/a...
Day 2 - Advent of Code 2025
adventofcode.com
December 3, 2025 at 10:54 AM
I just completed "Gift Shop" - Day 2 - Advent of Code 2025 #AdventOfCode adventofcode.com/2025/day/2
I did not manage to finish yesterday, but slowly getting back up to speed. This year I am also publishing my code on GitHub github.com/alexsinner/a...
I did not manage to finish yesterday, but slowly getting back up to speed. This year I am also publishing my code on GitHub github.com/alexsinner/a...
It is that time of the year again :) #AdventofCode
I just completed "Secret Entrance" - Day 1 - Advent of Code 2025 #AdventOfCode adventofcode.com/2025/day/1
I just completed "Secret Entrance" - Day 1 - Advent of Code 2025 #AdventOfCode adventofcode.com/2025/day/1
Day 1 - Advent of Code 2025
adventofcode.com
December 1, 2025 at 12:00 PM
It is that time of the year again :) #AdventofCode
I just completed "Secret Entrance" - Day 1 - Advent of Code 2025 #AdventOfCode adventofcode.com/2025/day/1
I just completed "Secret Entrance" - Day 1 - Advent of Code 2025 #AdventOfCode adventofcode.com/2025/day/1
I wrote about my experiment building my new blog with Kiro: alex.sinner.lu/2025/11/kiro...
TL;DR;
- AI assistants are powerful, but lack judgment
- Engineering discipline matters more with AI, not less
-Developers need broader skills: architecture, product thinking, and project management
TL;DR;
- AI assistants are powerful, but lack judgment
- Engineering discipline matters more with AI, not less
-Developers need broader skills: architecture, product thinking, and project management
Kiro First Impressions
Building a production website with Kiro's AI coding assistant: lessons learned, limitations encountered, and mitigation strategies that worked.
alex.sinner.lu
November 27, 2025 at 9:44 AM
I wrote about my experiment building my new blog with Kiro: alex.sinner.lu/2025/11/kiro...
TL;DR;
- AI assistants are powerful, but lack judgment
- Engineering discipline matters more with AI, not less
-Developers need broader skills: architecture, product thinking, and project management
TL;DR;
- AI assistants are powerful, but lack judgment
- Engineering discipline matters more with AI, not less
-Developers need broader skills: architecture, product thinking, and project management
I just published my first article on my new personal blog where I will share my reflections, observations, and insights after leaving AWS and Amazon after 17+ years.
alex.sinner.lu/2025/11/clar...
alex.sinner.lu/2025/11/clar...
Clarity of Vision, Sponsorship, Execution
Three critical factors determine initiative success: clarity of vision, strong sponsorship, and effective execution. Learn how to avoid common failure patterns.
alex.sinner.lu
November 19, 2025 at 1:00 PM
I just published my first article on my new personal blog where I will share my reflections, observations, and insights after leaving AWS and Amazon after 17+ years.
alex.sinner.lu/2025/11/clar...
alex.sinner.lu/2025/11/clar...
RIP Ozzy, Prince of Darkness 😢🦇
Truly a legend who loved his art until the very end.
🤘
Truly a legend who loved his art until the very end.
🤘
July 22, 2025 at 7:43 PM
RIP Ozzy, Prince of Darkness 😢🦇
Truly a legend who loved his art until the very end.
🤘
Truly a legend who loved his art until the very end.
🤘
Reposted by Alex Sinner
Here is a December survey comparing AI attitudes in C-suite vs non C-suite. The C-suite is for more excited than the other workers at these companies. www.axios.com/2025/03/18/e...
AI is "tearing apart" companies, survey finds
Study shows that C-suite execs push AI tools that workers don't want to use.
www.axios.com
March 21, 2025 at 2:37 PM
Here is a December survey comparing AI attitudes in C-suite vs non C-suite. The C-suite is for more excited than the other workers at these companies. www.axios.com/2025/03/18/e...
Is there a term for the opposite of the singularity when humanity achieves superstupidity?
January 7, 2025 at 9:57 PM
Is there a term for the opposite of the singularity when humanity achieves superstupidity?
Finished my Lego project for the holidays. These are half the droids you are looking for!
December 31, 2024 at 1:07 PM
Finished my Lego project for the holidays. These are half the droids you are looking for!
Reposted by Alex Sinner
Anyone saying that GenAI could replace software engineers don't understand how software is created (and operated.)
Tool innovations have always make the process of building software faster, cheaper: GenAI and AI agents will also do this.
But these are tools and efficiency gains.
Tool innovations have always make the process of building software faster, cheaper: GenAI and AI agents will also do this.
But these are tools and efficiency gains.
December 30, 2024 at 6:29 AM
Anyone saying that GenAI could replace software engineers don't understand how software is created (and operated.)
Tool innovations have always make the process of building software faster, cheaper: GenAI and AI agents will also do this.
But these are tools and efficiency gains.
Tool innovations have always make the process of building software faster, cheaper: GenAI and AI agents will also do this.
But these are tools and efficiency gains.
Fantastic winter day with Loki in the woods!
December 27, 2024 at 7:00 PM
Fantastic winter day with Loki in the woods!
Taking a break from #AdventOfCode. I still have some unfinished business, but 45* out of 50 is pretty good for me. I really struggled with 21 (Keypad Conundrum), and somehow failed to get part B of 16 (Reindeer Maze) right. I manually solved 24 part B (Crossed Wires), but not in code. Good fun!
December 26, 2024 at 2:19 PM
Taking a break from #AdventOfCode. I still have some unfinished business, but 45* out of 50 is pretty good for me. I really struggled with 21 (Keypad Conundrum), and somehow failed to get part B of 16 (Reindeer Maze) right. I manually solved 24 part B (Crossed Wires), but not in code. Good fun!
I just completed "LAN Party" - Day 23 - Advent of Code 2024 #AdventOfCode adventofcode.com/2024/day/23
This one was surprisingly easy. But much appreciated so that I can go back to the robots from Day 21 who were giving me nightmares...
This one was surprisingly easy. But much appreciated so that I can go back to the robots from Day 21 who were giving me nightmares...
Day 23 - Advent of Code 2024
adventofcode.com
December 23, 2024 at 8:53 PM
I just completed "LAN Party" - Day 23 - Advent of Code 2024 #AdventOfCode adventofcode.com/2024/day/23
This one was surprisingly easy. But much appreciated so that I can go back to the robots from Day 21 who were giving me nightmares...
This one was surprisingly easy. But much appreciated so that I can go back to the robots from Day 21 who were giving me nightmares...
I just completed "Chronospatial Computer" - Day 17 - Advent of Code 2024 #AdventOfCode adventofcode.com/2024/day/17
Finally solved the second part of Day 17. It turned out the solution I did not believe would work actually worked...
Finally solved the second part of Day 17. It turned out the solution I did not believe would work actually worked...
Day 17 - Advent of Code 2024
adventofcode.com
December 22, 2024 at 9:27 PM
I just completed "Chronospatial Computer" - Day 17 - Advent of Code 2024 #AdventOfCode adventofcode.com/2024/day/17
Finally solved the second part of Day 17. It turned out the solution I did not believe would work actually worked...
Finally solved the second part of Day 17. It turned out the solution I did not believe would work actually worked...
I just completed "Monkey Market" - Day 22 - Advent of Code 2024 #AdventOfCode adventofcode.com/2024/day/22
Where the difficulty was not the coding part, but making sense of the 'bananas' description
Where the difficulty was not the coding part, but making sense of the 'bananas' description
Day 22 - Advent of Code 2024
adventofcode.com
December 22, 2024 at 8:35 PM
I just completed "Monkey Market" - Day 22 - Advent of Code 2024 #AdventOfCode adventofcode.com/2024/day/22
Where the difficulty was not the coding part, but making sense of the 'bananas' description
Where the difficulty was not the coding part, but making sense of the 'bananas' description
I just completed "Race Condition" - Day 20 - Advent of Code 2024 #AdventOfCode adventofcode.com/2024/day/20
Interesting change of perspective for part 2. But I remain confused about the example provided being inconsistent with the description (and the solution)
Interesting change of perspective for part 2. But I remain confused about the example provided being inconsistent with the description (and the solution)
Day 20 - Advent of Code 2024
adventofcode.com
December 20, 2024 at 9:06 PM
I just completed "Race Condition" - Day 20 - Advent of Code 2024 #AdventOfCode adventofcode.com/2024/day/20
Interesting change of perspective for part 2. But I remain confused about the example provided being inconsistent with the description (and the solution)
Interesting change of perspective for part 2. But I remain confused about the example provided being inconsistent with the description (and the solution)
I just completed "Linen Layout" - Day 19 - Advent of Code 2024 #AdventOfCode adventofcode.com/2024/day/19
It helps to remember things in memory...
It helps to remember things in memory...
Day 19 - Advent of Code 2024
adventofcode.com
December 19, 2024 at 9:10 PM
I just completed "Linen Layout" - Day 19 - Advent of Code 2024 #AdventOfCode adventofcode.com/2024/day/19
It helps to remember things in memory...
It helps to remember things in memory...
I just completed "RAM Run" - Day 18 - Advent of Code 2024 #AdventOfCode adventofcode.com/2024/day/18
Luckily this was a bit easier than the previous days. Would have been faster if I managed to properly copy paste the correct value of the part 2 solution...
Luckily this was a bit easier than the previous days. Would have been faster if I managed to properly copy paste the correct value of the part 2 solution...
Day 18 - Advent of Code 2024
adventofcode.com
December 18, 2024 at 9:31 PM
I just completed "RAM Run" - Day 18 - Advent of Code 2024 #AdventOfCode adventofcode.com/2024/day/18
Luckily this was a bit easier than the previous days. Would have been faster if I managed to properly copy paste the correct value of the part 2 solution...
Luckily this was a bit easier than the previous days. Would have been faster if I managed to properly copy paste the correct value of the part 2 solution...
Completed part 1 for each of day16 and 17 #Adventofcode. Backlog for part 2 will have to wait until the WE
December 17, 2024 at 10:22 PM
Completed part 1 for each of day16 and 17 #Adventofcode. Backlog for part 2 will have to wait until the WE
I just completed "Warehouse Woes" - Day 15 - Advent of Code 2024 #AdventOfCode adventofcode.com/2024/day/15
Slowly learning how to visualize things in order to debug...
Slowly learning how to visualize things in order to debug...
Day 15 - Advent of Code 2024
adventofcode.com
December 15, 2024 at 8:22 PM
I just completed "Warehouse Woes" - Day 15 - Advent of Code 2024 #AdventOfCode adventofcode.com/2024/day/15
Slowly learning how to visualize things in order to debug...
Slowly learning how to visualize things in order to debug...
I just completed "Restroom Redoubt" - Day 14 - Advent of Code 2024 #AdventOfCode adventofcode.com/2024/day/14
I found the tree!
I found the tree!
December 14, 2024 at 8:23 PM
I just completed "Restroom Redoubt" - Day 14 - Advent of Code 2024 #AdventOfCode adventofcode.com/2024/day/14
I found the tree!
I found the tree!
I just completed "Claw Contraption" - Day 13 - Advent of Code 2024 #AdventOfCode adventofcode.com/2024/day/13
solved through equations after a first misguided attempt with an A*-inspired (or uninspired) approach
solved through equations after a first misguided attempt with an A*-inspired (or uninspired) approach
Day 13 - Advent of Code 2024
adventofcode.com
December 14, 2024 at 8:55 AM
I just completed "Claw Contraption" - Day 13 - Advent of Code 2024 #AdventOfCode adventofcode.com/2024/day/13
solved through equations after a first misguided attempt with an A*-inspired (or uninspired) approach
solved through equations after a first misguided attempt with an A*-inspired (or uninspired) approach
I just completed "Plutonian Pebbles" - Day 11 - Advent of Code 2024 #AdventOfCode adventofcode.com/2024/day/11
Finally completed this one. Tricky to think of the correct mental model for the right data structure. But sleeping on problems helps, the brain keeps processing ;-)
Finally completed this one. Tricky to think of the correct mental model for the right data structure. But sleeping on problems helps, the brain keeps processing ;-)
Day 11 - Advent of Code 2024
adventofcode.com
December 13, 2024 at 7:56 AM
I just completed "Plutonian Pebbles" - Day 11 - Advent of Code 2024 #AdventOfCode adventofcode.com/2024/day/11
Finally completed this one. Tricky to think of the correct mental model for the right data structure. But sleeping on problems helps, the brain keeps processing ;-)
Finally completed this one. Tricky to think of the correct mental model for the right data structure. But sleeping on problems helps, the brain keeps processing ;-)