Guillermo Betancourt

* Confidential *

Led frontend development for a fintech startup, designing and maintaining a dashboard and onboarding process using JavaScript and Vue, driving €1.5M+ in B2B transactions. Also implemented ETL pipelines in Python and Go on AWS, and handled unit testing, code reviews, and platform maintenance, reporting directly to the CTO.

Developed and optimized enterprise frontend applications for targeted advertisement delivery using Angular and TypeScript, scaling from 3 to 50+ media outlets across the Iberian Peninsula. Designed APIs and data pipelines in GoLang on Google Cloud Platform (Pub/Sub, DataFlow, BigQuery, BigTable) to analyze user data, predict trends, and drive business growth.

Developed scalable APIs for a money lending platform using Spring Boot and Java to provide enriched data to users. Built and optimized frontend applications with React and Redux, creating user registration UIs and dashboards for displaying user information.

Developed tools for the Semantic Web and Linked Data, including a Python-based interpreter for mapping rules that transformed structured and unstructured data into RDF knowledge graphs. This enabled semantic enrichment and annotation of diverse biomedical data sources.

Integrated and maintained tools and services for data visualisation and interaction in a single data management system using Python, JavaScript, HTML and CSS.