Juan M. Fonseca-Solís

“Perseverance is a virtue of the less brilliant.” - Santiago Ramón y Cajal

Welcome. At this site, you can get information about my portfolio and areas of research.

Software quality

Since 2013, I have been working in software testing, performing end-to-end functional automation and manual verifications in web technologies. I am familiar with Selenium Webdriver (DotNet, Python, Java), Playwright (TS/JS), Appium, and performance. Also, generative AI with Cursor. On 2024 I obtained the ISTQB CTFL 4.0 certification. Please take a look at my automation portfolio on https://github.com/juanfonsecasolis-automation.

Digital Signal Processing (DSP)

I have also specialized in digital signal processing, particularly audio. My master thesis was about recognizing the sound of accessible pedestrian signals (APS), first studied by Mario Monge and Sharon Bejarano in 2013. I also like analysing other one-dimensional signals; like economical indicators or server response times. For content related to DSP, please take a look at my Jupyter notebooks and publications.

Jupyter notebooks

• Jul 2025 » Estrellas en el manto de Nuestra Señora de Guadalupe
• Apr 2025 » Principios SOLID
• Feb 2021 » Desmistificando la transformada de ondeletas
• Nov 2020 » Evaluación sobre la pérdida de la calidad en el códec OPUS
• Sep 2020 » Pairwise testing
• Ago 2020 » Pruebas de estrés desde la perspectiva de los sistemas lineales e invariantes en el tiempo
• Jun 2020 » Four exercises for understanting echoes and reverberations
• Sep 2018 » Moving average for sending early alerts: the day when the electronic billing system failed in Costa Rica
• Mar 2015 » Interpolation applied to a BCCR signal

Other projects

• Abril 2017 » Reconocimiento de digitos escritos a mano usando aprendizaje profundo
• Oct 2020 » Selenium-Webdriver on Github Actions using POM, Page Factory, and Gerhkin
• Nov 2017 » Automatic recognition of pedestrian signals - RASP
• Apr 2013 » ACAI webpage (TCU work)
• Jan 2011 » JuanmaHOS

Publications

• Author. Accessible pedestrian signals recognition using an adaptive approach. Escuela de electrónica. TEC. Cartago, CR. 2018. Master thesis (GitHub repository here).
• Co-author. Automatic recognition of accessible pedestrian signals. The Journal of the Acoustical Society of America 141. 3913. Boston, USA. 2017.
• Co-author. Automatic recognition of accessible pedestrian signals. JoCICI17 (2). Cartago, Costa Rica. 2017.
• Co-author. Reconocimiento de dígitos escritos a mano usando aprendizaje profundo (draft). Instituto Tecnológico de Costa Rica, Visión por Computadora, prof. P. Alvarado-Moya. 2017 (code repository here).
• Author. Reconocimiento de Vocales usando un Clasificador Bayesiano (draft). Instituto Tecnológico de Costa Rica, Reconocimiento de Patrones, prof. J. Crespo-Mariño. 2016.
• Author. Detección de voces y otros ruidos en ambientes de trabajo y estudio JoCICI15 (1): 68-71. CITIC-PCI. San José, CR. 2015 (demo here).
• Author. Automatic pitch recognition in a computer game interface. Ingeniería 25 (1): 13-33, ISSN: 2215-2652; 2015. San José, CR. 2015.

Talks

• Centro de las Artes TEC. Reconocimiento automático de señales peatonales accesibles de semáforo en dispositivos móviles. JoCICI 2017. August 24th, 2017.
• Canal de transferencia del conocimiento. Detección de voces y otros ruidos en ambientes de trabajo y estudio. JoCICI 2015. March 6th, 2015.

Slides

• An introduction to A/B testing using a Google Optimize example.
• Quick start on webtesting on 2019.

Contact

I’m always happy to hear from people who are interested in my work. Feel free to contact me if you see an oportunity to team up together.

• Linkedin: https://cr.linkedin.com/in/juan-m-fonseca-solis
• Academia Edu: http://itcr.academia.edu/JuanFonsecaSol%C3%ADs