StackD.
Freelance software development
Web · Mobile · AI · Spain / Remote EU
1BlockFlowSaaS · in production
2Kiblo · TRACEiOS · live on the App Store
3DrossMac app · notarized
4StatusTaking work
StackD is the freelance practice of Arnau López, a full-stack software developer. I design, build and ship web apps, mobile apps and AI features, from the first screen to production.
Selected work
What I do
01
Web apps
Next.js & TypeScript · APIs & databases · Deployed & monitored
From the first screen to the production database: auth, payments, admin panels, the parts that make it real.
02
Mobile apps
React Native & Expo · iOS release · App Store review
Two apps taken through App Store review and live in the store.
03
AI features
LLM integrations · Voice & agents · Human in the loop
Agents that act inside your product, with a clear line between what runs on its own and what waits for a person.
2apps live on the App Store
1B2B SaaS running in production
1person on the whole stack: design, backend, release
How a project runs
01Call )
We talk about the problem, not the feature list.
02Scope & price )
A short written scope and a fixed price, or a retainer.
03Build )
Weekly builds you can open and use, not status reports.
04Launch )
Deployed, store review handled, code and IP handed over.
Production, not demos
If it doesn't run with real users, it isn't done. I ship it, deploy it and stay on to fix what breaks.
One person, whole stack
Design, frontend, backend and release. You talk to the person writing the code, no handoffs.
You own it
Full code and IP transfer when we finish. A clean, documented repo and no lock-in.
Stack
What I build with
TypeScript, Next.js, React, React Native, Expo, Python, FastAPI, Node.js, Postgres, Supabase, Firebase, SwiftUI, OpenAI, Anthropic, Vercel
FAQ
01How fast can you start?
Usually within a week of the first call. I take a small number of projects at a time so each one gets full attention.
02Who owns the code?
You do. Full IP transfer when the project ends, no exceptions.
03How do you charge?
A fixed price for a defined scope, or a monthly retainer for ongoing work. I'll suggest one after we talk.
04Do you sign NDAs?
Yes. Happy to sign yours before you share anything sensitive.
05Is it just you?
Yes. StackD is my freelance practice, so you work directly with me from the first call to launch.
Have a project? Let's talk!