notes

Below is a list of my 2025 clippings from my Kindle.

A CTO’s Guide to Measuring Software Development Productivity - Amazon Web Services

Lead time measures the total elapsed time from when a customer need is first identified to when the solution delivers measurable value.

Tools of Systems Thinkers - Albert Rutherford

Linear thinking is enforced by our education system. We learn to reduce and dissect problems to smaller, more manageable components without looking at the big picture first.

We need to integrate the separate departments of knowledge into one to see how they are connected. This way, we can better understand the complex challenges of the world.

I’m about to present an example borrowed from Draper Kauffman’s introduction to systems thinking from the 1980s.

Because everything is interconnected, the whole system is comprised of a series of feedback loops. When we understand the nature of feedback loops, we can start to plan interventions to resolve the problems they create.

Key aspects of building a good model: define, expand, and aggregate.

Test your knowledge by brainstorming defined questions about your everyday life.

Our mental models are limited because our life experience is limited; we only know what we have been exposed to.

The most critical first step is that we need to leave our echo chamber.

Söylevler - Epiktetos

Hükmümüz altında olanları elimizden gelen en iyi biçimde; geri kalanlarını ise doğalarına uygun biçimde kullanmak

Yeryüzünde bedeninden ayrılmayacak tek kafanın benimki olduğunu sana ne zaman söyledim?

Daha iyisini seçtim diyorsan, bunu sana veren kim? Verilenle yetinmek için çaba göstermez misin?

Against Motivation - Laura van den Berg

You don’t even have to believe in yourself all the time if you can just believe in the process you have committed to. That steadiness of presence.

This is another thing I love about routine: you can take it with you wherever you go. Routine is a shelter. It gives us someplace to be, regardless of the moment we’re in.

Karate Science Dynamic Movement (Martial Science) - J. D. Swanson Ph.D.

Generally, there are three major ways to position the hip: front facing (shomen), half front or reverse half front facing (hanmi or gyaku hanmi), and side facing (yoko).

It is important not to think of the knees as being pushed outward or, worse, to actually do it. Instead, envision a direct connection between the outside edges of the feet and the inside of the hip.

Shime refers to the leg’s connection to the hip.

There are three principles important for executing tsuki correctly. The first is that the elbow of the striking limb rubs close to the side of the body until the elbow passes the torso. This ensures the correct muscles are connected as the technique accelerates from the hip.

Finally, it is important to develop flexibility and only kick within the limits of your flexibility.

Disaster Recovery Plan for DevOps - Daria Kulikova

Panic is the worst when it comes to a disaster.

The average downtime cost can exceed $9K per minute, which makes rapid recovery essential.

Foundational concepts of Karate-Do, integrating technique and spirit. A summary from the books: - Dynamic Karate by Masatoshi Nakayama - Karate Basic Principles by Paul Kuttner - Karate Budo The Endless Search for Absolute Kime by Gilles Lavigne - Karate Technique Spirit by Nakamura Tadashi

Karate’s story goes way back to the 6th century BCE. The monk Daruma (Bodhidharma) brought meditation and martial practices from India into China. That mix of physical training and Zen thinking shaped what would later become the backbone of many martial arts. By the Tang Dynasty, Shaolin monks had made martial arts central, and Japan was already borrowing a lot from Chinese culture, including fighting systems. Some people even suggest karate might have roots in ancient Greece before Daruma, but honestly, those theories are pretty weak.

During Japan’s feudal era, the emperor’s power faded and the warriors took over. By 1192, Yoritomo became the first Shogun, and Japan entered centuries where the sword ruled. Meanwhile, in Okinawa, weapons were banned. With no swords to rely on, people turned farm tools into weapons and developed a hidden empty-hand system called Okinawa-te. That was the real seed of karate. By the 18th and 19th centuries, Okinawan masters like Matsumora Kosaku and Higashionna Kanryo refined these methods, blending them with Chinese Quanfa. Later, Itosu Anko simplified karate, brought it into schools, and created the first real curriculum. His student, Funakoshi Gichin (1868–1957), carried karate to mainland Japan, renamed it Karate-Do (Way of the Empty Hand), and shifted the focus beyond fighting to include discipline and character.

In the 20th century, karate spread quickly. The uniform and belt system came from Jigoro Kano’s Judo, and soon karate schools everywhere were adopting them. Different styles branched out — Shotokan, Goju-Ryu, Shito-Ryu, Wado-Ryu, Kyokushin. Each with its own flavor. By the 1950s and 60s, Japanese masters were bringing karate overseas, especially to the U.S., where it exploded through dojos, tournaments, and eventually movies. Since then, karate has grown into both a sport and a way of life. Some people chase medals, others go deep into kata and philosophy. Leaders like Tadashi Nakamura (Seido Karate) and researchers like Helmut Kogel and Tetsuhiro Hokama have pushed karate forward, making sure it evolves without losing its spirit.

1. Karate-Do: Way of Life and Self-Actualisation: "Do" = path of self-actualisation; integration of body, mind, spirit / cultivates whole person, not just combat / Aim: physical, spiritual, and mental perfection / influenced by samurai ethics, Zen, Bushido / Lifelong study and self-discovery

2. Unity of Mind, Body, Spirit (Shin Gi Tai): Physical: Strength, stamina, biomechanics, expansion or contraction / Mental: Focus, awareness, strategies, emotional control / Spiritual: Character, humility, Zen-based self-discovery

3. Kime (Focus & Decision): Definition: Complete focus in technique execution / Physical: Muscle contraction, alignment, timing, breathing / Mental: Precision, coordination, tactical awareness (Maai, Hyoshi, Yomi) / Spiritual: Willpower, commitment, present-moment energy

4. Stances (Dachi): Purpose: Stable, adaptable base for techniques and movement / Key Aspects: Weight distribution, hip/knee alignment, dynamic transitions / Examples: Zenkutsu, Kiba, Kokutsu, Sanchin, Heiko, Neko Ashi, Fudo, etc.

5. Breathing (Kokyu) & Hara/Tanden: Importance: Core of power, timing, and control / Technique: Tanden-based breathing, Ibuki, pulse breathing, IAP / Spirit: Breath as unifier of body-mind-spirit; Zen/Taoist/Buddhist methods

6. Kata (Forms) & Bunkai (Applications): Kata: Choreographed sequences, essence of training / Technique: Strikes, blocks, conditioning, bunkai/oyo, kyusho, tuite / Spirit: Vehicle for calmness, harmony, "moving Zen", mushin, zanshin

7. Kumite (Sparring) & Self-Defense: Purpose: Practical application, real-world readiness / Technique: Distance, timing, offense/defense, SSE sequence / Spirit: Self-mastery, non-violence, awareness, fighting spirit

8. Etiquette & Character: Courtesy: Bowing, uniform, respect, humility / Core: Respect, sincerity, self-control, ethical behavior / Principles: Omoiyari, Ko Gaku Shin, Fu Gen Jikko, Heijo Shin, etc.

9. Balance (Kuzushi) & Movement (Unsoku/Tai Sabaki): Kuzushi: Breaking balance (static, dynamic, mental, subtle) / Movement: Footwork, body shifts, rhythm (Hyoshi), hidden timing

10. Origins & Philosophical Influences: Okinawan roots, Chinese boxing, Bubishi text / Masters: Funakoshi, Miyagi → beyond combat / Zen & Bushido influence; “Moving Zen” / Perennial philosophy: matter → spirit continuum / Chakras/Kundalini energy model / Mantras/Kototamas: spiritual sounds for energy

I am surrounded by Hegel readers. I made a list for myself in this order:

• Hegel's Phenomenology of Spirit: A Critical Guide (Cambridge Critical Guides) - Dean Moyar, Michael Quante
• The Hegel Myths and Legends - edited by Jon Stewart
• Hegel’s Idealism: The Satisfactions of Self-Consciousness - Robert Pippin
• The Preface to the Phenomenology of Spirit - Hegel
• Phenomenology of Spirit - G. W. Friedrich Hegel
• The Science of Logic - - G. W. Friedrich Hegel

Last update is a week ago and the repo has 4.7K stars https://github.com/juliocesarfort/public-pentesting-reports

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Top 21 cybersecurity experts you must follow on Twitter in 2021 via Security Boulevard

1. Cloud Native Transformation, by P. Reznik, J. Dobson, M. Gienow 2019 - via O'Reilly

I do recommend to everybody who are working with Cloud, especially to consultants. Free via container-solutions.com

2. Security Warrior, by Cyrus Peikari, Anton Chuvakin 2004 - via O'Reilly

This book reveals how your systems can be attacked.

3. The Phoenix Project, Gene Kim et al. 2013 - via O'Reilly

A triller for SREs and CTOs

4. The Unicorn Project, by Gene Kim - via O'Reilly

It is again a nice novel about digital transformation developers and all kind of issues related with these two. A part II for the Phoenix Project

diffsitter - A tree-sitter based AST difftool to get meaningful semantic diffs

See it in action

diffsitter performs diffs on text files using the AST to compute the diff instead of using a naive text-based diff. This can give you more semantically meaningful diff information, which will prevent diffs from getting polluted by formatting differences, for example.

diffstter uses the parsers from the tree-sitter project to parse source code. As such, the languages supported by this tool are limited by the languages supported by the tree-sitter project.

A prefect diff tool shows the difference of two files semantically. It is unfortunately only for Rust language but it is very inspiring.

Understanding the container security concepts that impact your organization

Full paper - PDF

TLDR;

Scream these to your developer team:

• Don’t let the shipping container imagery fool you; containers are not a special security boundary
• Containers use primitives of the Linux kernel (cgroups, namespaces) toisolate processes in an environment
• A “container image” is your application and its dependencies, and uses a “base image”as the basis for thecontainer image
• Container registries host your container images. It’s important that you be able to trust your base and container images, and that you use a private, trusted registry