https://www.asanchezyali.com/blog A space dedicated to exploring the intersections of mathematics, computer science, software development, artificial intelligence, and deep learning. Sharing ideas, experiences, and discoveries in the fascinating world of technology. en alejandro@piagents.dev (Yali Dev) alejandro@piagents.dev (Yali Dev) Wed, 09 Sep 2026 00:00:00 GMT https://www.asanchezyali.com/blog/case-studies/aluna https://www.asanchezyali.com/blog/case-studies/aluna The third engineering case study: how Aluna screens candidates with six specialised agents instead of one chatbot, why every answer is schema-bound, and what it takes to build erasure into a hiring product rather than bolt it on. Wed, 09 Sep 2026 00:00:00 GMT alejandro@piagents.dev (Yali Dev) case-studyalunaai-agentsrecruitmentcompliancesystem-design https://www.asanchezyali.com/blog/case-studies/crearia-agent https://www.asanchezyali.com/blog/case-studies/crearia-agent The second engineering case study: how CREARIA Agent answers customer questions on WhatsApp using RAG over pgvector and MCP tool orchestration — and why putting a queue between the channel and the LLM turned out to be the decision everything else hangs off. Wed, 09 Sep 2026 00:00:00 GMT alejandro@piagents.dev (Yali Dev) case-studycreariaai-agentsragmcpwhatsappsystem-design https://www.asanchezyali.com/blog/case-studies/plixiq https://www.asanchezyali.com/blog/case-studies/plixiq A behind-the-scenes case study of Plixiq — why we picked FastAPI, Next.js, LiteLLM and a modular monolith to run AI agents on WhatsApp, plus the pluggable agent types, the graph-based flow engine, the guards, the billing loop, and the architecture diagrams. Thu, 25 Jun 2026 00:00:00 GMT alejandro@piagents.dev (Yali Dev) case-studyplixiqai-agentswhatsappsystem-design https://www.asanchezyali.com/blog/blockchain/20241106Blockchain https://www.asanchezyali.com/blog/blockchain/20241106Blockchain This article explores the evolution and foundations of cryptography, from its origins in ancient Egypt to its crucial role in blockchain technology. We begin with a historical journey that includes Egyptian hieroglyphics and Caesar cipher, accompanied by practical implementations in Python. We examine the modern principles established by Claude Shannon and the CIA security triad (Confidentiality, Integrity, and Authenticity). The central part of the article delves into how modern cryptography underpins blockchain technology through techniques such as hashing, symmetric and asymmetric encryption, illustrated with practical code examples. This 40-minute tutorial provides a solid understanding of how cryptography has evolved to become the fundamental pillar of security and trust in blockchain systems. Wed, 06 Nov 2024 00:00:00 GMT alejandro@piagents.dev (Yali Dev) blockchainsmart-contractsdappscryptography https://www.asanchezyali.com/blog/ai/20240917ZeroShot https://www.asanchezyali.com/blog/ai/20240917ZeroShot Zero-Shot Text Classification (ZSTC) is a machine learning technique that allows models to classify texts into categories without having been previously trained on those specific categories. It uses pre-trained language models, such as BART or GPT, which have learned to understand semantic relationships between words and phrases during their pre-training. This approach allows the model to generalize its knowledge and make inferences about new categories based on a given text, without the need for labeled examples. Tue, 17 Sep 2024 00:00:00 GMT alejandro@piagents.dev (Yali Dev) aizero-shot-learningtransformershugging-face https://www.asanchezyali.com/blog/differentiable-programming/20240923DifferentiablePrograms https://www.asanchezyali.com/blog/differentiable-programming/20240923DifferentiablePrograms Neural networks can be viewed as algorithms with adjustable parameters, optimized through machine learning. This approach allows us to address them from a broader mathematical and computational perspective. In this article, we will explore how to represent these algorithms as directed acyclic graphs (DAGs). Fri, 23 Aug 2024 00:00:00 GMT alejandro@piagents.dev (Yali Dev) mathematicscomputer-science https://www.asanchezyali.com/blog/ai-avatars/20240703DigitalHuman https://www.asanchezyali.com/blog/ai-avatars/20240703DigitalHuman A Step-by-Step Guide to Creating Your Next AI-Powered Avatar. Wed, 03 Jul 2024 00:00:00 GMT alejandro@piagents.dev (Yali Dev) ai-avatardigital-humanartificial-intelligence https://www.asanchezyali.com/blog/ai-avatars/2024020AIAvatar https://www.asanchezyali.com/blog/ai-avatars/2024020AIAvatar Create your own conversational avatar with Azure Cognitive, LangChain, and OpenAI. Tue, 20 Feb 2024 00:00:00 GMT alejandro@piagents.dev (Yali Dev) ai-avatardigital-humanartificial-intelligence https://www.asanchezyali.com/blog/number-theory/20230108DivisionAlgorithm https://www.asanchezyali.com/blog/number-theory/20230108DivisionAlgorithm A division algorithm is a process that divides one number (called the dividend) by another number (called the divisor) and obtains the quotient and remainder of the division. A division algorithm can be implemented in Python using a while loop and subtracting the divisor from the dividend in each iteration. Knowing how a division algorithm works and how to implement it on our own is useful for understanding better how divisions work and can be useful in situations where we cannot use predefined libraries or functions. Tue, 10 Jan 2023 00:00:00 GMT alejandro@piagents.dev (Yali Dev) mathematicsnumber-theorypython https://www.asanchezyali.com/blog/modular-arithmetic/20220510ModularArithmetic https://www.asanchezyali.com/blog/modular-arithmetic/20220510ModularArithmetic In this tutorial, we are going to learn how to create a library for modular arithmetic, using operator overloading and redefining the built-in functions for NumPy. Wed, 05 Oct 2022 00:00:00 GMT alejandro@piagents.dev (Yali Dev) pythonoperator-overloadingnumber-theorylights-out-game https://www.asanchezyali.com/blog/blockchain/20220323SolanaNFTandIPFS https://www.asanchezyali.com/blog/blockchain/20220323SolanaNFTandIPFS Learn how to create your own NFT collection on Solana using IPFS. Discover how NFTs are revolutionizing digital property rights and how you can leverage this technology on Solana. Wed, 23 Mar 2022 00:00:00 GMT alejandro@piagents.dev (Yali Dev) solananftmetaplex https://www.asanchezyali.com/blog/blockchain/20220310Solana https://www.asanchezyali.com/blog/blockchain/20220310Solana Solana is a high-performance blockchain that enables the development of decentralized applications (Dapps) using tools such as Anchor and the Phantom crypto wallet. In this tutorial, you will learn how to build the base code for your own Dapp on Solana. Thu, 10 Mar 2022 00:00:00 GMT alejandro@piagents.dev (Yali Dev) solanadapps https://www.asanchezyali.com/blog/ml/20210712MachineLearning https://www.asanchezyali.com/blog/ml/20210712MachineLearning What allows us to learn as human beings? In general, we acquire much of our knowledge through our experience with objects and the world around us. This means that we learn from the information and data we gather about them, rather than relying on abstract mathematical definitions. Mon, 12 Jul 2021 00:00:00 GMT alejandro@piagents.dev (Yali Dev) machine-learningmathematics https://www.asanchezyali.com/blog/operator-overloading/20210615OperatorOverloadingInPython https://www.asanchezyali.com/blog/operator-overloading/20210615OperatorOverloadingInPython What is operator overloading and how does it work in Python? Tue, 15 Jun 2021 00:00:00 GMT alejandro@piagents.dev (Yali Dev) pythonoperatorsoperator-overloadingclasses