Hi, I'm
Alejandro Arjonilla
Software Engineering Consultant
10+ years building mobile apps, scalable backends, and AI-augmented workflows across FinTech, blockchain, and SaaS.
Experience
Nov 2024 — Present
Software Engineer · Full-Stack
Control
Built the iOS app from scratch with scalable architecture. Collaborated on backend and frontend web app. Championed AI-augmented workflows — best practices for LLMs in code generation, review, and testing.
May 2023 — Apr 2025
Mobile Lead
Bitstack (YC S22)
Led mobile dev for a YC-backed FinTech. Maintained legacy app while building a scalable new Flutter app. Integrated Apple Pay, Google Pay, Firebase.
Nov 2021 — May 2023
iOS Engineer
Hoseki
Built Bitcoin infrastructure iOS app from scratch. Blockchain exchange APIs, backend (Node.js), UX collaboration.
Oct 2018 — Nov 2021
iOS Developer
Xapo Bank
Core iOS team that re-launched Xapo app on time. ReactiveSwift, Realm, Firebase, CircleCI. Fully remote, global FinTech.
May 2017 — Oct 2018
iOS Developer Lead
United Cuisines
Led mobile team, coordinated external consultants on enterprise digitalization projects.
Mar 2016 — Aug 2018
iOS Developer
Videona Socialmedia S.L.
Built video editing apps from scratch (Videona, ViMoJo, Kamarada). AVFoundation, real-time media.
Nov 2015 — Mar 2016
Junior iOS Developer
Integrasys S.A.
Skills
Mobile
Backend & Web
Architecture & DevOps
AI & Tooling
Education
MBA
IEBS Business School
2019 — 2021
B.Sc. Audiovisual Systems Engineering
Universidad Carlos III de Madrid
2008 — 2013
Entrepreneurship
PROSFY
Co-Founder
2021 — Present
Language
Spanish
Native
English
Professional
Highlights
10+ years fully remote, distributed teams
Shipped apps used by 100K+ users
Experience across US, EU & LATAM markets
Former national team athlete — Silver Medal, Ibero-American Championship