Lead software engineer · Independent maker
I build software people can keep.
I’m Jesus Sanz, a software engineer in Spain. I turn useful ideas into calm, capable products for desktop, web, and Apple platforms.
Selected work · 01
Small tools.
Real utility.
Products designed to respect your attention, your data, and your time.
Browse the full work archive01 · Notes · Apple platforms
QuackNotes
Fast, file-based notes for people who want to own their words. Plain text, Markdown, and code—with no accounts and no lock-in.
Visit QuackNotes
02 · Finance · Desktop & web
Clink Clink
A privacy-first expense planner that projects your balance before life happens. Model scenarios, understand loans, and keep every number local.
Visit Clink Clink
03 · Time & pay · Open source
Punchboard
Track work hours, vacation, and sick days on a calm monthly calendar—then estimate gross and net pay without sending data to a server.
How I work · 04
Useful by design.
- 01
Own your data
Local-first architecture, portable files, and clear choices beat lock-in.
- 02
Quietly capable
Good software gets out of the way while still rewarding power users.
- 03
Ship the details
Performance, accessibility, and polish are part of the product—not cleanup.
A little about me
Engineer by trade.
Builder by instinct.
I’m a lead software engineer with a background spanning frontend, native Apple development, DevOps, and systems. I like the whole journey: finding the useful idea, shaping the interface, and shipping the thing.
More about meHave a thoughtful project?