Software Engineering Beyond Code diegojromerolopez.github.io/blog/2026/07... My thoughts about the effect of LLMs in Software Engineering.

Some months ago, I created fscollections, a Python package that implements standard library collection interfaces while storing their data in files. github.com/diegojromero... I had this repository abandoned for a while (a minimal POC) and leveraging LLM technology I was able to build it fully.

I have created a C compiler that has improved features on safety and defined behavior. I am not an expert in Rust, not in compiler construction. How have I done it? rebrand.ly/stricc

stricc: Building a Safe C Compiler Through Specification and Validation

stricc: A Specification-Driven Compiler Experiment I have created a C compiler that has improved features on safety and defined behavior. Introduction In this post I am going to show how it is possibl...

rebrand.ly

Some thoughts on LLM mental fatigue rebrand.ly/llm-mental-f...

My experience on building an application where I was a unexperienced in a domain: rebrand.ly/using-llms-i... See the code: github.com/diegojromero... Wasm version: diegojromerolopez.github.io/oinakos/inde...

I have been working on creating a project with non-trivial complexity to assess the potential of LLMs as the main tool of Software Engineering. It was a success. The project is an open source web scraper: github.com/diegojromero... Read about my experience in my blog: rebrand.ly/creating-a-c...

I have created a series of blog posts with about upgrading a #python 2 application with LLMs: diegojromerolopez.github.io/blog/2026/01... diegojromerolopez.github.io/blog/2026/01... diegojromerolopez.github.io/blog/2026/01... Some successes, some failures, good lessons though.

Like many things in life, preventing the technical debt is the best way to not fall in it. I write about some simple techniques that can help you avoid it while creating new software projects. diegojromerolopez.github.io/blog/2026/01...

Hey #Python blueskyers, what's your take on static validation of Python code? www.reddit.com/r/Python/com... 🤔

From the Python community on Reddit: What's stopping us from having full static validation of Python code?

Explore this post and more from the Python community

reddit.com

Now, what would happen if I leverage LLMs in a language I don't have much experience in an unknown area for me? I will come back with my findings!

It's been interesting to check what's the speed of coding some Python libraries with some AI support. Of course I didn't aspire to have 100% perfect code, but they have tests and they work. The speed is an order of magnitude lower. Months are now weeks, and the weeks days.

Second project done making extensive use of LLMs: github.com/diegojromero... a mypy extension that provides a decorator to mark functions that raise exceptions.

GitHub - diegojromerolopez/mypy-raise: A mypy extension that provides a decorator to mark functions that raise exceptions

A mypy extension that provides a decorator to mark functions that raise exceptions - diegojromerolopez/mypy-raise

github.com

I have created this plugin for mypy: mypy-pure (github.com/diegojromero...) that provides a function decorator that enforces (partial) purity. The development took less than 6 hours because I used LLMs. Read my opinion about the experience: diegojromerolopez.github.io/blog/2025/12...

I've leveraged Antigravity and the Claude and Gemini models to create a #mypy plugin to signal a function as free of side-effects. The development has been much faster! Check it out! github.com/diegojromero...

Just heard that a person has an appointment to their doctor to the year 2999 #software #databases #errors

Several weeks ago I developed a package to ease the pain of instrumenting #Python code with #OpenTelemetry. Now, I have written a post in my blog explaining how to use it. Check it out! diegojromerolopez.github.io/blog/2025/09...

Why not have a way to have automatic #OpenTelemetry instrumentation for your functions in #Python? I have created a package called otelize (pypi.org/project/otel...) that provides a decorator that creates a span for each function call. github.com/diegojromero... Feedback welcome!

New very basic library for helping your #opentelemetry efforts in #Python: github.com/diegojromero...

Some days ago I was using #copilot for code generation and had a fragment of Queen's Bohemian Rhapsody in the test code I wanted to review. I kid you not, the AI responded by ignoring all my instructions and adding the next part of the verse.

AI is pretty useful for getting the scaffolding in a programming language. Forgot how to create a decorator in #python or don't want to create to a TypedDict by hand? The AI has your back!

I wrote a #python package for writing log messages with a background #thread. It is a proof of concept but it led me to interesting new ideas and challenges, posible issues and improvements. github.com/diegojromero... It’s the basic premise of async functions but done without the event loop.

Do you do unit tests and integration tests in your code? Why you should be doing both? diegojromerolopez.github.io/blog/2025/06...

Unpopular opinion: I don't like *args and **kwargs in #python. diegojromerolopez.github.io/blog/2025/05...

Do you read code just for pleasure? I was intrigued about how #pylint works and took a look to some rules. What are your favorite legible software projects?

Simplicity in software engineering is a must. If you do nothing against the continuous complexity increase, you will pay. For sure you will face a hurdle while extending or maintaining your software that you will not be not be able to overcome.

Some days ago I learned how to patch objects in the setUp method with #unittest in #python. I used to patch objects via the @patch decorator, but I'm starting to think this is cleaner if the same object is mocked for all the test methods. diegojromerolopez.github.io/blog/2025/02...

I developed and maintain a #python package to freeze objects called gelidum (github.com/diegojromero...). I've noticed that I have a bunch of users but they haven't given me any feedback. How do you approach your users to ask them for feedback?

Just asked #chatgpt how to improve my #python project github.com/diegojromero... and it surprisingly gave some good points. A new use-case for the AIs (for me): getting feedback for an open-source project.

How do you deal with #irrational people in the workplace? What is your approach to conversations with people that do not have their mind in the right place? Some of my thoughts here diegojromerolopez.github.io/blog/2025/01...

Been playing around with python a bit. type, metaclass and decorators to do a simple thing: enforce constants at class-level. github.com/diegojromero... This project is in pre-alpha, but it has forced me to learn and refresh some concepts, so it has some value.