Learn AI with rafa
Short, original guides for developers and engineering managers — using AI to do better work and build an international career. Every guide comes from my day-to-day experience, not recycled theory.
For devs & EMs
Written for people who ship and lead — practical AI you can put to work in your editor, your team, and your workflow this week.
International careers
Built from a London-to-São-Paulo path. How to use AI to close the gap between what you've done and how a hiring manager abroad reads it.
Original, no hype
Every guide is original work in plain language, with cited sources — never republished, never padded, never selling you a course.
Latest guides
Fresh, original walkthroughs — newest first.
ChatGPT Work vs Claude Cowork: the answer is in your admin console
Two workspace agents shipped 48 hours apart. The thing that actually decides which one your team runs isn't the model — it's a toggle an admin flipped before anyone got to try either. Here's the seam, and my routing rule.
Managed Agents: Anthropic Now Runs the Loop, Not Just the Model
Claude Managed Agents moves the agent loop, the sandbox and the session state onto Anthropic's infrastructure. The line nobody reads: it isn't eligible for Zero Data Retention or a HIPAA BAA — and self-hosting the sandbox doesn't buy that back.
A 3-Step AI Cost Audit: Seats, Tokens, and the Hours Nobody Books
Two thirds of companies have an AI dashboard. Barely a quarter can actually see what AI costs them. Here is the 3-step audit I run on a tooling budget: what to list, which number to pull for each line, and the threshold that means kill it.
97% vs 47% — Your Job Title Says Nothing About Your AI Exposure
Anthropic's index found 97% of tasks are automation-dominant through the API and 47% in chat. Same model, overlapping tasks. Exposure follows the deployment, not the job title — so stop forecasting the fog and run the migration test instead.
The CV Prompt That Screens You Out First
88% of employers say qualified high-skills candidates get vetted out for not matching the exact criteria in the posting. So don't ask AI to improve your CV — make it screen you out. The prompt, and the three decisions that keep it honest.
The Mock Interview Prompt That Refuses to Help You
The structured interview is the strongest single predictor of job performance, and also the one with the widest spread, because it can be built well or badly. A chat model builds you the bad one. Here is the prompt that installs the structure instead.
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