Slides

Presentations, decks & visual stories

A collection of all my presentation decks — conference talks, meetup slides, and technical deep dives. Built in-house with Reveal.js or hosted on external platforms.

Sergio Alexander giving a technical talk with a robot demo

My Slides

2026

May

Native

OpenClaw: Your Assistant. Your Machine. Your Rules. — The personal agent revolution

OpenClaw — Talk Companion to the blog post · 2026

A new generation of personal agents running under your rules, on your own machine. Project overview, architecture, and live demos of real use cases.

May 4, 2026

April

Native

The Mobile Landscape in 2026

Learning Mobile Development — Series Companion Deck · 2026

The map I drew before writing code: nine mobile frameworks, four categories, and why Flutter and KMP are the only two paths I'm still considering.

Apr 26, 2026

Native

Slides v2 — Kitchen Sink Demo

XergioAleX.com Demo · 2026

Kitchen-sink showcase of every layout, background, and Reveal.js feature in the v2 slide system — splits, full-bleed images, quotes, stats, tables, math.

Apr 25, 2026

2025

December

External

The Future of AI: Code, Hardware and Agents

Pereira Tech Talks · 2025

Co-presented with Sebastián Mora at Pereira Tech Talks — from writing code to orchestrating agents, what MCPs unlock, and AI touching physical hardware in 2025.

Dec 10, 2025 Google Slides

October

External

AI and the New Era of Programming at Open Tech Hackathon

Open Tech Hackathon · 2025

Vibe Coding workshop at Open Tech Hackathon — comparing Cursor, Codex, and Claude Code, and the conductor mindset for shipping faster with AI code agents.

Oct 4, 2025 Google Slides

2024

August

External

Astro in Action

Pereira Tech Talks · 2024

Why Astro is worth the switch — Microsoft and Firebase case studies, measurable performance gains, and a live Pereira Tech Talks migration.

Aug 1, 2024 Slides.com

2023

August

External

How AI is Revolutionizing Modern Application Development

Manizales Tech Talks · 2023

Three months after Pereira, an updated Manizales Tech Talks session on GPT-4, LangChain, RAG systems, and what had shifted in the AI ecosystem by August 2023.

Aug 26, 2023 Google Slides

May

External

The Rebirth of Artificial Intelligence

Pereira Tech Talks · 2023

Why ChatGPT ended the AI winter and started a generative revolution — my Pereira Tech Talks session on GPT-4, DailyBot's AI features, and what changed in 2022.

May 17, 2023 Google Slides

2022

March

External

How We Got Into Y Combinator

Universidad Tecnológica de Pereira · 2022

Three YC applications, three rejections, then acceptance — what changed between each attempt, the real interview experience, and scaling DailyBot after YC.

Mar 28, 2022 Slides.com

2021

March

External

Looking for Product Market Fit

Building and failing products at Rocka.co — lessons from each experiment, reading real PMF signals, and how DailyBot finally found its product-market fit.

Mar 28, 2021 Slides.com

External

Introduction to MyPy

Why we adopted type checking at DailyBot — catching bugs before runtime, clearer function contracts, and how MyPy changed our Python development culture.

Mar 3, 2021 Slides.com

2020

February

External

CSS Grid Layout

How CSS Grid changed my approach to layouts — two-dimensional control, named grid areas, and when to choose Grid over Flexbox in modern front-end work.

Feb 25, 2020 Slides.com

2019

October

External

Vue Vixens Talk: Styles in Vue

Vue Vixens Day Pereira · 2019

How Vue handles CSS — scoped styles, preprocessors, and component architecture at Vue Vixens Day Pereira, an event focused on diversity and inclusion in tech.

Oct 25, 2019 Slides.com

September

External

WebVR with A-Frame (UniRemington Talk)

Universidad Remington · 2019

Bringing VR to a university audience — VR vs AR vs mixed reality, A-Frame's entity-component system, and the browser as the best VR distribution platform.

Sep 15, 2019 Slides.com

August

External

Serverless, IoT and Conversational Interfaces

Manizales Tech Talks · 2019

Voice as the new interface — my Manizales Tech Talks session on Alexa skills, serverless event models, and designing conversational IoT applications.

Aug 23, 2019 Slides.com

July

External

Let's Talk About Flutter

Why Flutter's widget model and Skia rendering engine changed my approach to cross-platform mobile — from React Native limitations to pixel-perfect Dart magic.

Jul 5, 2019 Slides.com

March

External

Introduction to Serverless with Emphasis on IoT

From BaaS to FaaS and IoT events — why serverless changed how I think about infrastructure and how it pairs naturally with event-driven connected devices.

Mar 3, 2019 Slides.com

2018

December

External

Introduction to Webpack

How Webpack transformed front-end development — entry points, loaders, plugins, and why developer experience is more important than configuration complexity.

Dec 26, 2018 Slides.com

External

Docker Introduction

Containers and microservice-oriented architectures — what defines a microservice, how Docker fits in, and demos for building autonomous, scalable systems.

Dec 13, 2018 Slides.com

November

External

History, Discussion, and Analysis of the Bitcoin Paper by Satoshi Nakamoto

A deep reading of Satoshi's nine-page paper — from the history of money and the 2008 crisis to proof of work and an elegantly simple design.

Nov 15, 2018 Slides.com

October

External

Introduction to APIs with GraphQL

Why GraphQL changed how I build APIs — strong typing, client-driven queries, one endpoint, and why REST started feeling outdated for complex mobile clients.

Oct 20, 2018 Slides.com

September

External

Introduction to Vue.js

Pereira Tech Talks · 2018

Why Vue became my favorite framework — progressive design, reactivity, and what makes it click after years of Angular and React at Pereira Tech Talks.

Sep 29, 2018 Slides.com

External

Taming Big Data: An Introduction to Apache Spark

From RDDs to streaming — my university Big Data final project: slides, Jupyter notebooks, and a Docker Spark cluster to make distributed computing approachable.

Sep 23, 2018 Google Slides

July

External

Introduction to GoLang

Pereira Tech Talks · 2018

Why Go won me over — my Pereira Tech Talks session on Go's simplicity, built-in concurrency with goroutines, and what makes it genuinely different.

Jul 5, 2018 Slides.com

April

External

Blockchain: The Industrial Revolution of the Internet

Pereira Tech Talks · 2018

Blockchain beyond cryptocurrency — how decentralized trust reshapes supply chains, identity, and voting, and why it mirrors the industrial revolution's impact.

Apr 14, 2018 Slides.com

February

External

WebVR with A-Frame

Pereira Tech Talks · 2018

Building VR experiences with just HTML and JavaScript — A-Frame, Mozilla's framework for bringing virtual reality to the browser with zero configuration.

Feb 16, 2018 Slides.com

External

Deep Learning: From Academia to Practice

PyCon Colombia 2018 · 2018

My PyCon Colombia 2018 talk in Medellín — applied mathematics behind AI, from linear algebra and neural networks to gradient descent and computer vision.

Feb 9, 2018 Slides.com

2017

November

External

Microservices Architecture and APIs with GraphQL

Pereira Tech Talks · 2017

Why I moved from REST to GraphQL for microservices — divide and conquer, client-defined queries, and the trade-offs you need to know before adopting both.

Nov 23, 2017 Slides.com

October

External

Introduction to Blockchain and Ethereum

PereiraJS · 2017

From Bitcoin's mechanics to Ethereum smart contracts — demystifying crypto for PereiraJS with a live Solidity demo and no price speculation.

Oct 18, 2017 Slides.com

External

Introduction to TensorFlow

Pereira Tech Talks · 2017

My talk at the first Pereira Tech Talks meetup — Google's TensorFlow, neural network basics, and why a software engineer decided to learn machine learning.

Oct 18, 2017 Slides.com