arbsantos@fc.ul.pt

André Santos

Research Engineer

I completed my BSc degree in 2015 and my MSc degree in 2017 both in Informatics Engineering at Faculty of Science of the University of Lisbon. During my MSc thesis I worked on an approach that superimposes a virtual overlay to all other interfaces ensuring interface consistency by re-structuring how content is accessed in every screen.

I am currently a hired researcher at LASIGE. My main interest is mobile accessibility.

Publications

Typing Patterns as Digital Footprints: Enhancing Health Monitoring

Diana Pimentel, Diogo Branco, Filipa Ferreira-Brito, André Santos, Tiago Guerreiro

CHI 2025 ‑ CHI '25 workshop Envisioning the Future of Interactive Health

Investigating the Tradeoffs of Everyday Text-Entry Collection Methods

André Rodrigues, Hugo Nicolau, André Santos, Diogo Branco, Jay Rainey, David Verweij, Jan Smeddinck, Kyle Montague, Tiago Guerreiro

CHI 2022 ‑ ACM Conference on Human Factors in Computing Systems, May, 2022

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website
🏅 Best Paper Award

Promoting Self-Efficacy Through an Effective Human-Powered Nonvisual Smartphone Task Assistant

André Rodrigues, André Santos, Kyle Montague, Tiago Guerreiro

CSCW 2021 ‑ ACM Conference on Computer-Supported Cooperative Work and Social Computing, October, 2021

WildKey: A Privacy-Aware Keyboard Toolkit for Data Collection In-The-Wild

André Rodrigues, André Santos, Kyle Montague, Hugo Nicolau, Tiago Guerreiro

WildByDesign 2021 ‑ UbiComp/ISWC Workshop on Designing Ubiquitous Health Monitoring Technologies for Challenging Environments

Suggesting text alternatives for images in social media

Letícia Seixas Pereira, João Guerreiro, André Rodrigues, André Santos, João Vicente, José Coelho, Tiago Guerreiro, Carlos Duarte

SIGACCESS 2021 ‑ Newsletter June Edition

website
DOI

Projects

A chat application with the keyboard open and the written sentences displayed: Collects anywhere the user writes, Password and number fields are ignored, calculates more than 20 metrics

WildKey

A privacy-aware keyboard toolkit for data collection in-the-wild. With it you will be able to collect everyday typing data, enabling continuous and spontaneous assessments, without collecting any sensitive information.

A keyboard scheme with dots representing each of the collected touch points. Each key as dots from a different color. There is a concentration of dots on the most used keys (e.g. a, s and space)

Accessible Text-Entry

For over 10 years we have investigated nonvisual text input on touchscreens. We have characterized in dept users’ behaviors and contributed with novel interfaces and interaction techniques.

A blind person interacting with his smarptphone using over the ear headphones

Smartphone Accessibility

From newcomers to experts, we have characterized the challenges that blind people overcome. We explored how to provide effective self-contained smartphone assistance with the ultimate goal of promoting self-efficacy.

Storyboard demonstrating a shower attack.

Unauthorized Access to Smartphones

Unlike unlock authentication, which is an active defense against physical intrusion, passive defenses aim to primarily provide awareness, traceability, and recovery from intrusions; and to only secondarily engage counter-measures like blocking access. In sensitive computer systems, passive security is embodied in Intrusion Detection and Response (IDR) systems. To end-users, however, parallel capabilities remain unavailable, or lack security and usability validation, despite the severe privacy implications of intrusions. We thus envision a mobile IDR which is usable by individuals with no technical training; which can detect suspicious activity based on semantics of intrusion behavior; and which can respond to threats per their importance.