Diogo Baptista

Hi, I'm Diogo. I build products that meet people where they are.

I take on freelance work in AI automation, chatbots & agents, websites for small businesses and interactive apps — solo, senior, fixed-fee, most engagements ship in 2-6 weeks.

Between client projects I'm building Storay, shipping personal experiments, and finishing my Computational Social Science degree at UvA. Hire me for the day-job; the side projects are how I stay sharp.

Hire me →See my appsRead my CVTry DiogoOS
TypeScriptReactNext.jsPythonFastAPILangChainPostgresTailwindOpenRouterAnthropic APITypeScriptReactNext.jsPythonFastAPILangChainPostgresTailwindOpenRouterAnthropic API

Tech I work with

What I reach for on client projects — pick anything from here and I've probably shipped with it.

Languages

TypeScriptJavaScriptPythonSQLHTML/CSS

Frontend

ReactNext.jsViteTailwind CSSFramer Motion

Backend & data

FastAPIDjangoNode.jsPostgresSQLiteRedis

AI / ML

Anthropic APIOpenAI APILangChainCrewAIRAG pipelinesLLM-as-judge eval

Tooling

GitVercelDockern8nFigmaPosthog

Recent client work

A taste of what an engagement looks like. Full details on the freelance page.

Untire Now

Live

A four-step conversational coaching flow grounded in Untire Now's clinical content library. Empathy-first prompt design, retrieval over evidence-based material, and a safety layer that escalates to crisis resources when distress signals appear.

  • Designed the conversational coaching flow end-to-end
  • Built the RAG pipeline against the clinical content library
  • Set up LLM-as-judge evaluation and per-request observability
  • Implemented a risk-detection protocol that overrides the flow on distress
Next.js 15Claude SonnetOpenRouterSQLiteRAGLLM-as-judge
Visit live ↗

Golexai

Booking projects

Freelance AI engineering brand. I take on agentic systems, retrieval pipelines, prompt-tuned products and AI-assisted automations for small teams that need a senior implementer for a short window.

LangChainCrewAIAnthropicOpenAIn8nFastAPI
Visit live ↗
⚙  AI-powered automation✦  Chatbots & AI agents◆  Websites for small businesses✺  Interactive apps & games

Right now

Three things I split my time across. The middle one is how to hire me — the other two are why it's worth hiring me.

Founder · Building

Storay

My own product

A personal inventory app — catalogue what you own, then share a public shelf to sell anything in one click with zero platform fees. I lead product, design, engineering and brand.

Freelance · Open for projects

DiogoBap Studio

My freelance practice

AI automation, chatbots and agents, small-business websites and interactive apps. Solo, senior and fixed-fee — most engagements ship in 2-6 weeks. Currently booking new clients.

Student · Year 3

Computational Social Science

Bachelor's @ University of Amsterdam

A degree that sits between data science, social science and ethics — modelling societies with code, plus the methods and critique side. It's where my taste for products that 'meet people where they are' comes from.

How I work

Opinions I bring to every client project, whether it's an hour or a six-week build.

Tech that meets people where they are

Good products don't ask users to change. They slot into the life and habits people already have — and then quietly make them better.

Ship something every week

Long roadmaps rot. Small, weekly releases keep the loop tight and the feedback honest.

Generalist > specialist

I want to hold the whole stack in my head — research, design, engineering, AI, GTM — even if any one of those is held more deeply by someone else.

Find me online

The best places to read me, follow my work, or say hi.

LinkedInGitHubSubstackSend me an email