About AltoCode
AltoCode is a senior-led iOS engineering practice, driven by Fernando Putallaz. I help iOS teams move AI features on-device: no per-token cloud bills, no data leaving the phone. Not slideware — I've shipped it in production.
What I do
Most iOS AI features call a cloud model — which means a bill that grows with every user, sensitive data leaving the device, and a hard dependency on someone else's pricing and uptime. Apple's on-device AI stack has made another path real: the model runs on the phone. I help teams take it — either cutting the cloud-API cost on an AI feature they already ship, or building a new one that runs entirely on-device.
Everything starts with a fixed-scope, fixed-price On-Device AI Assessment. See how it works →
The proof — WhattaRAG
I'm not theorizing. I shipped WhattaRAG, a production on-device RAG app — embeddings, vector search, and LLM generation entirely on the phone — in 100% native Swift at ~4 MB. No servers, no accounts, no API costs; documents never leave the device. It's live on the App Store, downloadable and inspectable right now. Whatever I'd migrate or build for you, I've already shipped the harder version myself.
How I work
You get senior work directly — no agency margin, no junior coding behind a senior's name. Scope is deliberately fixed and bounded: a one-week assessment, then a defined sprint or build planned from it. Each engagement stands alone and leaves you with working code and a documented plan you own — you're never exposed on a long, open-ended timeline.
Also: senior iOS engineering
Not every team needs AI. If you need a senior iOS engineer who ships production-quality native Swift — architecture, features, stability — that work is welcome too. The on-device AI focus is the specialty, not the only door.
Let's talk.
Paying for a cloud AI feature, or want one without the recurring cost and privacy liability? Tell me about your app.
I reply within one business day.