About Us

Our objective, to build a valuable global business on affordable healthcare for retinal diseases, relies on the Retmarker Technology and Operating Model.

Retmarker, a patented and certified medical device, is a biomarker for Diabetic Retinopathy progression.

Diabetic Retinopathy is the eye-sight complication of Diabetes (382 Million today and 592 Millions estimated in 2035) and the leading cause of blindness in the working population. To avoid blindness, all Diabetics should be screened at least once a year in order to provide early and timely treatment.

Retmarker has been used with success in Diabetic Retinopathy Screening Programs since 2011. The aim of Retmarker is not to replace doctors and specialists, rather to provide efficient solutions that empower them to provide the best healthcare to those threatened by Diabetic Retinopathy.

João Diogo Ramos


João Diogo is currently the Chief Executive Officer.

He joined Critical Group, namely Critical Software, back in 2002 where he performed several roles in the fields of Engineering, Consultancy and Business Development. He started the Healthcare vertical at Critical Software, assessing new opportunities, establishing and maintaining partnerships and managing products. These activities eventually led to the creation of this company in 2008 where he first started as the Vision Business Unit Manager.

Before joining Critical, João Diogo worked in an e-Commerce company from Salvador Caetano group.

For a short period, João Diogo was also a researcher for the Dependable Systems Group at the University of Coimbra where he was involved in a project of a device for blind people.

João Diogo holds a Masters in Computer Science from the University of Coimbra, Portugal and several complementary trainings on entrepreneurship and management.

Frederico Teles


Frederico is currently the Engineering Manager. His main responsibilities are the definition of the technological strategies; project and resources management and the definition, optimization and assurance of effective implementation of Processes. He is also the lead Senior Developer in the .NET area.

Frederico first joined the company in the beginning of 2009 as Project and Technical Manager for the Retmarker products. Before that he was at Critical Software since 2006 as an Engineer for EAI (Enterprise Application Integration) area and was Project and Technical Manager for several projects in markets such as Government, Banking and Defense.

Before joining Critical, Frederico Teles worked as a lead Researcher in R&D for the Centre for Informatics and Systems of the University of Coimbra, Portugal (CISUC).

Frederico holds a Degree in Computer Science from the University of Coimbra, Portugal.

Carlos Manta

Image Processing / R&D

Since joining us in 2009, Carlos is managing the Image Processing team. His main responsibilities are assessing, providing and maintaining the technology that supports the Retmarker family of products.

Besides researching for new features and improving current ones, Carlos is involved in clinical studies that aim at translating new technologies into clinical practice, and in generating evidence that will support adoption of these technologies.

Previously Carlos had both industrial and academic experience. Namely he was a Research Engineer in the field of Signal Processing and Automation for 4 years with Hilti AG, Liechtenstein, and he also taught as “Assistente Convidado” at the University of Porto.

Carlos holds a Master of Science in Electronic Instrumentation Systems from UMIST, UK and a Degree in Electrical and Computer Engineering from the University of Porto, Portugal.

Andreia Frade

Quality & Regulatory

Andreia is responsible for maintaining the quality management system, certified by ISO9001:2008 & ISO1385:2003 and to provide strategic direction regarding all aspects of regulatory affairs for the Retmarker family of products.

Previously Andreia worked for "TIM we" as the Quality Assurance Director during 3 years.

Her previous experience is also in the software development industry, namely in process definition and implementation, and in project control areas, at Alcatel Portugal, Altitude Software and Siemens.

Andreia holds a Degree in Mathematics and Computer Science from Instituto Superior Técnico, Lisbon and a Post-graduation in Market Research and CRM, from Universidade Nova, Lisbon.

Ricardo Cunha-Vaz

Chairman of the board and co-founder

Ricardo holds the Diploma in economics from the London School of Economics, England, a MSc in economics from the University of Illinois, USA and a MSc in management from the Graduate School of Business of Stanford University, USA.

Ricardo is the Non executive Chairman since 2011. Currently, Ricardo co-leads the portuguese Private Equity management company - Menlo Capital - which advises a Fund to invest in SMEs requiring growth capital to expand their businesses.

Before these entrepreneurial ventures Ricardo led 3i’s practice in Portugal, was executive director of the Vista Alegre Atlantis group and worked as a consultant at Mckinsey & Company in Lisbon.

Gonçalo Quadros

Member of the board and co-founder

Gonçalo Quadros graduated in 1987 in Electrical Engineering (Computer Science branch) and has worked in industry and R&D prior to obtaining his PhD in Computer Science from the University of Coimbra in 2002. In his academic life, has taught at University of Aveiro and University of Coimbra (mathematics, computer and data communication subjects), has been author of more than 40 papers and has been reviewer for several conferences and magazines.

He co-founded Critical Software in mid-1998 and won the best business plan award from the National Young Entrepreneurs Association (ANJE) also in 1998. He was responsible for launching and consolidating several company business units assuming responsibilities for project and technical management of some of the most important projects and also for business development.

From 2005 to 2011, Gonçalo Quadros was Critical Software’s Chief Executive Officer, moving to Chairman in 2012. During 2006 he was distinguished by the President of Portugal with the “Ordem de Mérito Grande-Oficial”. He received afterwards the II INSEAD Entrepreneurship Award (promoted by Portuguese INSEAD Alumni), and the Ernst&Young (Portuguese Branch) Emerging Entrepreneur of the Year Award.

Pedro Murtinho

Member of the board

Pedro has been in Critical since 2001, where he was Senior Finance Officer. Beginning of 2005, he became the CFO for Critical Software and then Critical Links. At the moment he is CFO of the Group’s Holding company.

Before joining Critical, he was for one year the CFO on a real-estate holding with nine companies, which held investments across Portugal and Brazil. During this period he raised project finance operations and led negotiations with large hotel chains such as Marriott.

On 2000 he was briefly involved as CFO of a holding working mainly on trading of graphic arts machinery (the second largest vendor in Portugal), where he was in charge of settling representation deals with factories around Europe.

At the beginning of his career (from 1995 to 1999) he worked on a regional Association, where he made his internship and became CFO on 1997.

Pedro holds a bachelor degree in Corporate Management from the Economics College in University of Coimbra.