Glosso Studio
An Android language course that grades your pronunciation one sound at a time, in English and Russian. Free during the open beta; scoring runs in the cloud or, optionally, on your phone.
Hi, I'm Ignacio · Android engineer in Valencia
I build products that run on the device.
Android engineer with more than five years shipping apps for banks and agencies. In my free time I build my own, from the first commit to the store: a pronunciation coach, a transit app for Valencia and an on-device voice assistant.
- 6+
- years shipping Android professionally
- 2
- apps of my own live on Google Play
- 8+
- client apps delivered, several past 10k downloads
- 12+
- junior developers mentored
Work
Selected work
Products I have designed, built and shipped myself, from the first commit to real users.
TransitOS
An open-source Android transit app for Metrovalencia: live arrivals, trip planning and an interactive network map. No ads, no tracking, and a provider architecture so any operator can be added without touching the app.
EdgeMind
An Android voice assistant running Gemma 4 with native audio and tool calling, entirely on the phone. No cloud, no account, no telemetry.
CountIn
Real-time people counting with computer vision that runs entirely in the browser: a from-scratch tracker and line-crossing geometry, no server.
Capabilities
What I bring
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01
Product, end to end
Problem, design, code, store listing, website and support. I've taken my own apps from an empty repo to real users on Google Play.
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02
Android at scale
Kotlin, Jetpack Compose and Kotlin Multiplatform. Banking apps across four countries and a banking framework serving millions of users, with accessibility and security held to a high bar.
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03
AI that runs on the device
Speech, vision and language models running on the phone or in the browser: ONNX Runtime, LiteRT-LM, TensorFlow.js. Offline, private and fast.
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04
Private by design
No ads, no third-party trackers, data that stays on the device unless there is a reason to move it. Privacy is an architecture decision, not a settings page.
Track record
Experience
Banking apps for millions of users, client apps across many domains, and my own side projects.
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Nov 2025 - Present
Side projects · Glosso Studio
Glosso Studio and TransitOS on Google Play, plus EdgeMind and CountIn as open source.
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Aug 2023 - Oct 2025
Mobile Software Engineer · Globant
Multi-market banking app for Spain, Portugal, Poland and the UK, including TalkBack accessibility.
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Nov 2022 - Jul 2023
Mid-level Android Developer · Sopra Steria
Banking framework used by millions across several institutions. Kotlin, Compose, Clean Architecture.
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Mar 2020 - Nov 2022
Mid-level Android Developer · rudo apps (LÄBERIT)
8+ Android apps for clients, several past 10k downloads. Mentored 12+ junior developers.
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Jan 2021 - Present
Web, social media & mentoring · Hackerspace Valencia
Web, social media and mentoring. Lead Hackapet, an open-source project for animal shelters.
Off the clock
Beyond the code
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Hackerspace Valencia
I help run Valencia's hackerspace and lead Hackapet, an open-source project for animal shelters with people from DevOps, mobile, web and design.
hackvlc.es -
Old hardware, new life
I had a few e-readers with broken touchscreens. Now they're one-button Kindles that show my agenda and server status while they sleep.
Read about TagMod -
Learning in public
I spent two years letting AI write most of my code and some skills got rusty. Now I'm programming without it again, and writing about it.
Read the post -
Five languages
Spanish, Valencian, English, French and some German. Pronunciation is a topic close to home.
See Glosso
Writing
Notes from the workbench
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Fixing a bricked Tagus: breaking the recovery loop over UART
My Tagus got stuck in an infinite loop trying to install a non-existent update. Here's how I recovered it without ADB, using just a USB-UART adapter.
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TagMod: open-sourcing my hacked ereader software
I turned a broken-touchscreen e-reader into a one-button Kindle with an always-on dashboard. Now the code is open source.
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Glosso: what I learned building an app that listens to how you pronounce
How Glosso started, what it tries to solve, what works, what doesn't quite yet, and what having real users, even a few, has taught me.
Tell me what you're building.
I read every email myself and reply within a few days. Products, collaborations, Android or on-device AI work, or just a coffee in Valencia.