Oscar Duran
ES

Profile

I build apps, digital products, and applied AI.

I work across product, architecture, and execution. I like well-made apps, maintainable code, agents, LLM workflows, and automation that actually saves time.

I’m currently at Qonto. Before that I worked at Wallapop, InfoJobs, letgo, Ubeeqo, and Fever. I usually work around SwiftUI, clean architecture, testing, CI/CD, mobile product, and AI applied to development, UX, and automation.

Barcelona, Spain Apps, AI, agents, and interesting projects.

Featured work

A mix of real product work, public work, and intentional tooling.

Qonto

2021 - hoy

Senior iOS Developer · iOS / Fintech

Working on banking product for SMEs and freelancers. iOS development focused on quality, scalability, and user experience.

Snap.swift

2017

Open-source iOS library · Swift / iOS

A snapshot testing library for Swift.

InfoJobs

2015 - 2016

iOS Software Engineer · iOS / Jobs

I worked on the app rewrite with Swift, clean architecture, TDD, and CI. The goal was to improve both the technical base and the product quality.

Wallapop

2016 - 2017

iOS Software Engineer · iOS / Marketplace

I worked on chat and payments, helping with the migration from Objective-C to Swift and aligning development with product needs.
Apps

My own apps, each with its own route inside this site.

CCSE GO

2025

iPhone app · In development

Official-style exam simulator, personalized study plan, adaptive review, and meaningful progress tracking.
Links

If you want more context, these are my links.