https://iamtk.co Software Engineering, Lifestyle, Books, Learning https://raw.githubusercontent.com/imteekay/leandrotk.github.io/main/images/logo.jpg https://iamtk.co https://www.iamtk.co/2025-in-review-ml-books-career-writing https://www.iamtk.co/2025-in-review-ml-books-career-writing A reflection of my ML learning journey & plans for 2026 https://www.iamtk.co/deep-learning-for-healthcare-chest-x-ray-medical-diagnosis https://www.iamtk.co/deep-learning-for-healthcare-chest-x-ray-medical-diagnosis Working on Computer Vision Multiple Classification Problems for Medical Diagnosis https://www.iamtk.co/mastering-pytorch-from-linear-regression-to-computer-vision https://www.iamtk.co/mastering-pytorch-from-linear-regression-to-computer-vision Learning PyTorch: tensors, operations, linear regression, datasets, dataloaders, and computer vision https://www.iamtk.co/ai-ml-for-biology-and-healthcare-a-learning-path https://www.iamtk.co/ai-ml-for-biology-and-healthcare-a-learning-path Sharing my ML/AI & Biomedicine learning path https://www.iamtk.co/deep-learning-for-biology-predicting-protein-functions-from-sequences https://www.iamtk.co/deep-learning-for-biology-predicting-protein-functions-from-sequences Learning biology, proteins, deep learning for biology, and predicting protein functions from sequences https://www.iamtk.co/building-a-recurrent-neural-network-from-scratch-with-python-and-mathematics https://www.iamtk.co/building-a-recurrent-neural-network-from-scratch-with-python-and-mathematics A recurrent neural network implemented with mathematics and Python https://www.iamtk.co/building-a-logistic-regression-from-scratch-with-python-and-mathematics https://www.iamtk.co/building-a-logistic-regression-from-scratch-with-python-and-mathematics Learning theory and implementation of a logistic regression for single and multiple variables using Python and Mathematics https://www.iamtk.co/optimizing-nextjs-performance-lcp-render-delay-hydration https://www.iamtk.co/optimizing-nextjs-performance-lcp-render-delay-hydration Web Performance improvement for QuintoAndar webapp: LCP, Element Render Delay & Hydration https://www.iamtk.co/building-a-linear-regression-from-scratch-with-python-and-mathematics https://www.iamtk.co/building-a-linear-regression-from-scratch-with-python-and-mathematics Learning theory and implementation of a linear regression for single and multiple variables using Python and Mathematics https://www.iamtk.co/my-experience-learning-machine-learning-and-mathematics https://www.iamtk.co/my-experience-learning-machine-learning-and-mathematics Sharing the journey of learning Machine Learning, AI, Deep Learning, and Mathematics https://www.iamtk.co/building-a-deep-neural-network-from-scratch https://www.iamtk.co/building-a-deep-neural-network-from-scratch A deep neural network implemented with mathematics and Python https://www.iamtk.co/building-a-neural-network-from-scratch-with-mathematics-and-python https://www.iamtk.co/building-a-neural-network-from-scratch-with-mathematics-and-python A 2-layers neural network implemented with mathematics and Python https://www.iamtk.co/training-ml-models-for-cancer-tumor-classification https://www.iamtk.co/training-ml-models-for-cancer-tumor-classification Training Machine Learning models to classify cancer tumor types: Naive Bayes, Logistic Regression, SVM, KNN, Decision Tree, Random Forest, and XGBoost https://www.iamtk.co/essays/the-art-of-learning https://www.iamtk.co/essays/the-art-of-learning Essay: The Art of Learning https://www.iamtk.co/essays/applying-books-in-my-life https://www.iamtk.co/essays/applying-books-in-my-life Essay: Applying Books in My Life https://www.iamtk.co/essays/learning-and-the-power-of-the-first-step https://www.iamtk.co/essays/learning-and-the-power-of-the-first-step Essay: Learning & The Power of the First Step https://www.iamtk.co/series/mathematics-for-machine-learning/statistics-fundamentals https://www.iamtk.co/series/mathematics-for-machine-learning/statistics-fundamentals Learning the fundamentals of Statistics for Machine Learning https://www.iamtk.co/series/mathematics-for-machine-learning/linear-algebra-fundamentals https://www.iamtk.co/series/mathematics-for-machine-learning/linear-algebra-fundamentals Learning the fundamentals of Linear Algebra for Machine Learning https://www.iamtk.co/series/mathematics-for-machine-learning/calculus-derivatives-and-optimization https://www.iamtk.co/series/mathematics-for-machine-learning/calculus-derivatives-and-optimization Learning the fundamentals of Calculus, Derivatives, and Optimization for Machine Learning https://www.iamtk.co/series/mathematics-for-machine-learning/algebra-fundamentals https://www.iamtk.co/series/mathematics-for-machine-learning/algebra-fundamentals Learning the fundamentals of algebra for Machine Learning https://www.iamtk.co/series/mathematics-for-machine-learning https://www.iamtk.co/series/mathematics-for-machine-learning A documentation series about my mathematics studies for Machine Learning https://www.iamtk.co/leveraging-the-idle-until-urgent-technique-to-improve-performance https://www.iamtk.co/leveraging-the-idle-until-urgent-technique-to-improve-performance Performance optimizations for the interaction to next paint metric: Leveraging the Idle Until Urgent technique https://www.iamtk.co/optimizing-inp-for-a-react-app-and-performance-learnings https://www.iamtk.co/optimizing-inp-for-a-react-app-and-performance-learnings Performance optimizations for the interaction to next paint metric and sharing the learning along the way https://www.iamtk.co/taking-a-break https://www.iamtk.co/taking-a-break Recharging my energy to get the passion for my programming craft back https://www.iamtk.co/2023-in-review https://www.iamtk.co/2023-in-review What I did in 2023 and what I plan for 2024 https://www.iamtk.co/bookshelf/2023-booklist https://www.iamtk.co/bookshelf/2023-booklist My list of books of 2023 https://www.iamtk.co/series/essentials-of-interpretation/control-flow-if-and-while-expressions https://www.iamtk.co/series/essentials-of-interpretation/control-flow-if-and-while-expressions How to handle control flor with if and while expressions in a programming language https://www.iamtk.co/series/essentials-of-interpretation/variables-environments-and-blocks https://www.iamtk.co/series/essentials-of-interpretation/variables-environments-and-blocks How scope, variables, environments and blocks work in the semantics of a programming language https://www.iamtk.co/series/essentials-of-interpretation/the-programming-language-and-self-evaluating-expressions https://www.iamtk.co/series/essentials-of-interpretation/the-programming-language-and-self-evaluating-expressions The Eva programming language, its syntax and features, and the interpreter implementation: numbers, strings, and addition https://www.iamtk.co/series/essentials-of-interpretation/a-compiler-crash-course https://www.iamtk.co/series/essentials-of-interpretation/a-compiler-crash-course A crash course on compilers and runtime semantics https://www.iamtk.co/building-let-declarations-for-the-typescript-compiler https://www.iamtk.co/building-let-declarations-for-the-typescript-compiler Understanding how implement let declarations for the TypeScript compiler https://www.iamtk.co/allow-var-statements-to-declare-multiple-symbols-in-the-typescript-compiler https://www.iamtk.co/allow-var-statements-to-declare-multiple-symbols-in-the-typescript-compiler Understanding how implement multiple symbols for variable statements in the TypeScript compiler https://www.iamtk.co/building-emptystatement-and-semicolon-as-statement-ender-for-the-typescript-compiler https://www.iamtk.co/building-emptystatement-and-semicolon-as-statement-ender-for-the-typescript-compiler Understanding how empty statement and semicolon as statement ender are implemented in the TypeScript compiler https://www.iamtk.co/implementing-string-literals-for-the-typescript-compiler https://www.iamtk.co/implementing-string-literals-for-the-typescript-compiler Understanding how string literals are implemented in the TypeScript compiler https://www.iamtk.co/a-deep-dive-into-the-typescript-compiler-miniature https://www.iamtk.co/a-deep-dive-into-the-typescript-compiler-miniature Understand how the TypeScript compiler works: source code, scanner, parser, tokenization, binder, type checking, emitting files https://www.iamtk.co/solving-algorithmic-problems-using-the-two-pointers-technique https://www.iamtk.co/solving-algorithmic-problems-using-the-two-pointers-technique Solving algorithmic problems, algorithmic techniques, two pointers https://www.iamtk.co/javascript-scope-closures-and-the-typescript-compiler https://www.iamtk.co/javascript-scope-closures-and-the-typescript-compiler Understand how the TypeScript compiler uses closures https://www.iamtk.co/series/data-structures-in-javascript/tree-data-structure https://www.iamtk.co/series/data-structures-in-javascript/tree-data-structure Data Structures and Algorithms — Trees, Binary Trees, Binary Search Trees https://www.iamtk.co/the-evolution-of-react-rendering-architectures-and-web-performance https://www.iamtk.co/the-evolution-of-react-rendering-architectures-and-web-performance Understanding different rendering architectures in react.js and how they impact performance on the web: Client-Side Rendering, Server-Side Rendering, and Streaming SSR https://www.iamtk.co/a-high-level-architecture-of-the-typescript-compiler https://www.iamtk.co/a-high-level-architecture-of-the-typescript-compiler Understand how the TypeScript compiler works: source code, scanner, parser, tokenization, binder, type checking, emitting files https://www.iamtk.co/series/crafting-frontend/spotify-playlist-frontend-system-architecture https://www.iamtk.co/series/crafting-frontend/spotify-playlist-frontend-system-architecture Frontend System Design of the Spotify Playlist https://www.iamtk.co/webpack-bundle-splitting-and-browser-caching https://www.iamtk.co/webpack-bundle-splitting-and-browser-caching How to use webpack code splitting and browser caching to improve performance https://www.iamtk.co/profiling-and-optimizing-the-runtime-performance-with-the-devtools-performance-tab https://www.iamtk.co/profiling-and-optimizing-the-runtime-performance-with-the-devtools-performance-tab Investigating performance problems with the devtools performance tab and improving the web performance of the React runtime application https://www.iamtk.co/series/algorithms-problem-solving/decode-the-message https://www.iamtk.co/series/algorithms-problem-solving/decode-the-message Solving algorithms problems: decode the message https://www.iamtk.co/writing-a-memoization-function-from-scratch https://www.iamtk.co/writing-a-memoization-function-from-scratch How to write a memoization function from scratch and improvement the performance of your functions with caching https://www.iamtk.co/frontend-infrastructure https://www.iamtk.co/frontend-infrastructure Empowering product teams with the foundational frontend ecosystem and reliable, performant, and developer-friendly tools to efficiently build great user experiences https://www.iamtk.co/series/data-structures-in-javascript/linked-list-data-structure https://www.iamtk.co/series/data-structures-in-javascript/linked-list-data-structure Solving algorithm problems with TK https://www.iamtk.co/series/data-structures-in-javascript/queue-data-structure https://www.iamtk.co/series/data-structures-in-javascript/queue-data-structure Solving algorithm problems with TK https://www.iamtk.co/series/data-structures-in-javascript/stack-data-structure https://www.iamtk.co/series/data-structures-in-javascript/stack-data-structure Solving algorithm problems with TK https://www.iamtk.co/series/mastering-javascript/destructuring-objects-and-arrays https://www.iamtk.co/series/mastering-javascript/destructuring-objects-and-arrays The process to master JavaScript https://iamtk.co/series/website-changelog/refactoring-setup https://iamtk.co/series/website-changelog/refactoring-setup Setting the new website with NextJS, TypeScript, Prettier, and Testing Library https://iamtk.co/series/mastering-javascript/revisiting-conditionals-in-javascript-and-typescript https://iamtk.co/series/mastering-javascript/revisiting-conditionals-in-javascript-and-typescript The process to master JavaScript https://iamtk.co/series/website-changelog/building-my-legacy-through-accessible-open-and-free-content https://iamtk.co/series/website-changelog/building-my-legacy-through-accessible-open-and-free-content Building my legacy through this digital notebook https://iamtk.co/series/frontend-challenges/findhotel-frontend-challenge https://iamtk.co/series/frontend-challenges/findhotel-frontend-challenge Solving interesting challenges in the frontend domain with TK https://iamtk.co/how-i-received-4-salary-raises-in-2-years-of-quintoandar-as-a-software-engineer https://iamtk.co/how-i-received-4-salary-raises-in-2-years-of-quintoandar-as-a-software-engineer How to be a rebel at work and get promotions as a software engineer https://iamtk.co/on-leaving https://iamtk.co/on-leaving On Leaving https://iamtk.co/on-distraction https://iamtk.co/on-distraction Focusing on things I can control and systems to fight distractions and procrastination. https://iamtk.co/series/building-an-interpreter/parser-part-1 https://iamtk.co/series/building-an-interpreter/parser-part-1 Build a parser and the fundamental parts of the Abstract Syntax Tree https://iamtk.co/series/building-an-interpreter/repl https://iamtk.co/series/building-an-interpreter/repl Building an Interpreter: REPL https://iamtk.co/series/building-an-interpreter/lexical-analysis-part-3 https://iamtk.co/series/building-an-interpreter/lexical-analysis-part-3 Building an Interpreter: Lexical Analysis - Part 3 https://iamtk.co/series/rebuilding-mercaris-search/home-menu https://iamtk.co/series/rebuilding-mercaris-search/home-menu Rebuilding Mercari's Search: Home and Menu https://iamtk.co/series/rebuilding-mercaris-search/setup-nextjs-with-typescript-prettier-and-jest https://iamtk.co/series/rebuilding-mercaris-search/setup-nextjs-with-typescript-prettier-and-jest Rebuilding Mercari's Search: Setup NextJS with TypeScript, Prettier, and Jest https://iamtk.co/series/rebuilding-mercaris-search https://iamtk.co/series/rebuilding-mercaris-search A documentation series about how I rebuilt the Mercari's Search experience with NextJS, ReactJS, and TypeScript. https://iamtk.co/react-query-complex-dependent-queries https://iamtk.co/react-query-complex-dependent-queries Building complex queries in data fetching with react and react-query. https://iamtk.co/data-fetching-in-react-with-reactquery https://iamtk.co/data-fetching-in-react-with-reactquery Understanding data fetching from the early days with xml requests and jquery to these days that we handle more complex cases. https://iamtk.co/series/building-an-interpreter/lexical-analysis-part-2 https://iamtk.co/series/building-an-interpreter/lexical-analysis-part-2 The second part of the Lexical Analysis implementation of the interpreter https://iamtk.co/series/building-an-interpreter/lexical-analysis-part-1 https://iamtk.co/series/building-an-interpreter/lexical-analysis-part-1 The first part of the Lexical Analysis implementation of the interpreter https://iamtk.co/series/building-an-interpreter https://iamtk.co/series/building-an-interpreter A documentation series about the interpreter I'm building and learning https://iamtk.co/dx-and-software-maintainability-in-frontend-engineering https://iamtk.co/dx-and-software-maintainability-in-frontend-engineering Tech Debts, Software Maintainability, Developer Experience, and Technical Leadership https://iamtk.co/optimizing-the-performance-of-a-react-progressive-web-app https://iamtk.co/optimizing-the-performance-of-a-react-progressive-web-app A performance case study of a React PWA https://iamtk.co/performance-prefetch-next-pages-chunks https://iamtk.co/performance-prefetch-next-pages-chunks Prefetching next pages chunks to optimize performance https://iamtk.co/bookshelf/atomic-habits https://iamtk.co/bookshelf/atomic-habits Atomic Habits: Book Review https://iamtk.co/bookshelf/the-effective-engineer https://iamtk.co/bookshelf/the-effective-engineer Notes on how to be an effective engineer https://iamtk.co/slow-living https://iamtk.co/slow-living To experience life to the fullest https://www.iamtk.co/building-an-individual-development-plan-with-notion https://www.iamtk.co/building-an-individual-development-plan-with-notion In this post I share with you how I created a simple individual development plan using Notion https://iamtk.co/basic-recipes-for-react-testing-library https://iamtk.co/basic-recipes-for-react-testing-library Understanding testing in the frontend and react applications https://iamtk.co/a-mental-model-to-think-in-typescript https://iamtk.co/a-mental-model-to-think-in-typescript Types can be hard and this long-format essay tries to give a way of thinking about types and TypeScript https://iamtk.co/designing-my-lifes-system https://iamtk.co/designing-my-lifes-system A full documentation of how I designed a system for my life https://iamtk.co/ux-studies-with-react-typescript-and-testing-library https://iamtk.co/ux-studies-with-react-typescript-and-testing-library Studying and applying UX using React, TypeScript, Testing Library https://iamtk.co/series/data-structures https://iamtk.co/series/data-structures Solving algorithms problems with TK https://iamtk.co/series/typescript-learnings/interesting-types https://iamtk.co/series/typescript-learnings/interesting-types Learning interesting types from TypeScript https://iamtk.co/constant-feedback-driven-development-with-nodemon https://iamtk.co/constant-feedback-driven-development-with-nodemon As I'm building a lot of TypeScript projects, I wanted to make it more dynamic and with constant feedback. https://iamtk.co/publisher-a-tooling-to-automate-the-process-to-publish-my-blog-posts https://iamtk.co/publisher-a-tooling-to-automate-the-process-to-publish-my-blog-posts An implementation detail of the Publisher tooling to automate the process to publish blog posts https://iamtk.co/series/typescript-learnings/type-system https://iamtk.co/series/typescript-learnings/type-system Understanding TypeScript Type Systerm https://iamtk.co/series/elixir-learnings/playing-around-with-lists https://iamtk.co/series/elixir-learnings/playing-around-with-lists Understanding how lists work in Elixir https://iamtk.co/react-hooks-context-api-and-pokemons https://iamtk.co/react-hooks-context-api-and-pokemons Understanding hooks and the context API by building a Pokemon app. https://iamtk.co/fun-with-dates https://iamtk.co/fun-with-dates Learning about Dates and playing around with a new API https://iamtk.co/series/elixir-learnings https://iamtk.co/series/elixir-learnings Learning elixir with TK https://iamtk.co/thinking-in-data-contracts https://iamtk.co/thinking-in-data-contracts This is part of my studies on how to build sustainable and consistent software. https://iamtk.co/series/typescript-learnings https://iamtk.co/series/typescript-learnings Learning TypeScript with TK https://iamtk.co/consistent-state-management-in-react-and-redux https://iamtk.co/consistent-state-management-in-react-and-redux This is part of my studies on how to build sustainable and consistent software. https://iamtk.co/tdd-functions-and-react-components https://iamtk.co/tdd-functions-and-react-components This is part of my studies on how to build sustainable and consistent software. https://iamtk.co/closure-currying-and-cool-abstractions https://iamtk.co/closure-currying-and-cool-abstractions In this article, we will talk about closures, curried functions, and play around with these concepts to build cool abstractions. https://iamtk.co/series/data-structures/tree-data-structure https://iamtk.co/series/data-structures/tree-data-structure This post is to help you better understand the Tree Data Structure and to clarify any confusion you may have about it.. https://iamtk.co/series/data-structures/linked-list-data-structure https://iamtk.co/series/data-structures/linked-list-data-structure Notes on what is a linked list, how it works, and a Python implementation https://iamtk.co/series/data-structures/queue-data-structure https://iamtk.co/series/data-structures/queue-data-structure Notes on what is a queue, how it works, and a Python implementation https://iamtk.co/series/data-structures/stack-data-structure https://iamtk.co/series/data-structures/stack-data-structure Notes on what is a stack, how it works, and a Python implementation https://iamtk.co/building-an-abstraction-for-react-internationalization-messages https://iamtk.co/building-an-abstraction-for-react-internationalization-messages I came across a feature I wanted to build and... https://iamtk.co/designing-my-learning-experience https://iamtk.co/designing-my-learning-experience I'm learning a lot and sharing knowledge. This is my first take on designing a better learning experience https://iamtk.co/thoughts-on-my-productivity https://iamtk.co/thoughts-on-my-productivity Think about my energy. Think about prioritization. Think about tasks planning. Think about removing distractions. https://iamtk.co/functional-programming-principles-in-javascript https://iamtk.co/functional-programming-principles-in-javascript In this post, I will tell you more about functional programming, and some important concepts, with a lot of code examples. https://iamtk.co/an-introduction-to-the-basic-principles-of-functional-programming https://iamtk.co/an-introduction-to-the-basic-principles-of-functional-programming In this post, I will tell you more about functional programming, and some important concepts, with a lot of code examples. https://iamtk.co/understanding-the-basics-of-ruby-on-rails-sql-databases-and-how-they-work https://iamtk.co/understanding-the-basics-of-ruby-on-rails-sql-databases-and-how-they-work Learn about databases and how they connect with Ruby on Rails. https://iamtk.co/actionable-advice-to-start-learning-to-code https://iamtk.co/actionable-advice-to-start-learning-to-code This post has stories and a lot of actionable advice for you to be inspired, motivated, and take the first step in the programming world. https://iamtk.co/understanding-the-basics-of-ruby-on-rails-http-mvc-and-routes https://iamtk.co/understanding-the-basics-of-ruby-on-rails-http-mvc-and-routes We’ll understand the basics of how the web, the routes, and the MVC architecture work using the Ruby on Rails web framework https://iamtk.co/learning-python-from-zero-to-hero https://iamtk.co/learning-python-from-zero-to-hero High-level programming language, and its core design philosophy is all about code readability and a syntax which allows programmers to express concepts in a few lines of code. https://iamtk.co/writing-idiomatic-beautiful-ruby-code https://iamtk.co/writing-idiomatic-beautiful-ruby-code A dynamic, open source programming language with a focus on simplicity and productivity. It has an elegant syntax that is natural to read and easy to write. https://iamtk.co/learning-ruby-from-zero-to-hero https://iamtk.co/learning-ruby-from-zero-to-hero Ruby is simple in appearance, but is very complex inside, just like our human body.