Dr. Gabriel B. GuillenEngineer · Attorney · Data Scientist

Career History

14+ Years of Experience

From founding a web studio in Buenos Aires to engineering at PayPal and Meta in Silicon Valley — bridging software engineering, legal practice, data science, and academia across three continents.

9

Roles

4

Countries

PayPal · Meta

Current / Recent

2011

Career Start

💳
PayPal Inc.

PayPal Inc.

Project Leader — Sr. Software Engineer

San Jose, California

2025 – Present
  • Lead the Cross-border initiative for the search team — capacity planning, project tracking, and system integration via JIRA/Confluence
  • Lead PayPal/Venmo wallet interoperability with WeChat Pay, Mercado Pago, and partner ecosystems across money-movement, identity, and settlement flows
  • Own indexing, relevance, query understanding, and latency optimization services on the Search team using Python & REST APIs
  • Serve as Legal & Privacy liaison — privacy-by-design, data minimization, DPIA inputs, cross-border data transfer reviews — reducing privacy audit findings by 30%
  • Lead AI acceleration: LLM-assisted code reviews, automated testing, AI development cycle dashboarding
🌐
Meta Platforms, Inc.

Meta Platforms, Inc.

Software Engineer

Sunnyvale, California

2024
  • Optimized ML pipelines, cutting process time from 50 to 34 hours (32% reduction) across Instagram, Facebook, and WhatsApp data
  • Enhanced ML pipeline reliability through auto-remediation and stabilization techniques affecting content ranking across platforms
  • Streamlined ML pipelines via refactoring — cut error rates by 25%, improved data handling
  • Coordinated with London AEMI team via dashboarding tools, shortening project timelines by 20%
  • Managed 300 TB of data through ML pipelines improving speed and accuracy for ad experiments
🏢

Adaptone LLC (Quantikis / Open System Inc.)

Country Manager — Software Team Leader

Georgia, United States

2021 – 2023
  • Led a team of 7 engineers in Argentina plus developers in the US, Italy, and Spain as software architect
  • Selected, onboarded, and trained new employees across multiple countries
  • Managed offshore staffing solutions to enhance business operations and support company expansion
  • Oversaw HR functions in Argentina ensuring local legal and accounting compliance
💻

Adaptone LLC

Full Stack Developer

Atlanta, Georgia

2020 – 2021
  • Directed architectural overhaul of multicultural software team — 40% improvement in system integration efficiency
  • Pioneered microservices architecture: 50% increase in deployment speed, 30% reduction in downtime
  • Developed technical roadmap transitioning legacy systems to modern architecture — 25% operational efficiency gain
  • Introduced automation tools reducing time-to-market by 30% and increasing customer satisfaction by 25%
🎓
Lehigh University

Lehigh University

Graduate Teaching Assistant

Bethlehem, Pennsylvania

2019 – 2020
  • Evaluated and graded assignments, supervised exams, held office hours for eight sections of BIS 044
  • Developed instructional materials including PowerPoint slides and Jupyter Notebook labs
  • Designed and led laboratory sessions with Excel and Python reinforcing lecture concepts
  • Maintained attendance records, coordinated class schedules, organized academic resources
🔧

CS Business Services

Full Stack Software Developer

Buenos Aires, Argentina

2015 – 2020
  • Championed Agile/Scrum development — 30% faster project turnaround
  • Directed legacy code refactoring with Java/Hibernate/Spring — 25% reduction in bug rates
  • Optimized PostgreSQL performance — 45% increase in transaction processing speeds
🏛️
National University of La Matanza

National University of La Matanza

Head of Advanced Programming / Teacher

Buenos Aires, Argentina

2013 – 2018
  • Instructed Programming I/II and Foundations of ICT in C, C++, Java, and C# — Engineering Department
  • Conducted Continuing Education courses in Marketing, Product Development, and Advanced Programming using Scrum
  • Taught Computing I/II for the Pedagogy Department using Microsoft Office Suite and Visual Basic
  • Reviewed academic publications in software engineering applying risk-assessment criteria
🏙️

Morón City Hall Project

Team Leader & Full Stack Developer

Argentina

2013 – 2015
  • Led development of a GIS Application using Java, PHP, and .NET enhancing municipal data accessibility
  • Directed design of municipal applications including GIS and financial software with Hibernate and Flask
  • Managed client relationships and oversaw project execution from inception to completion
🌟

Studio Webstern

Partner

Buenos Aires, Argentina

2011 – 2013
  • Co-founded web design and printing solutions company using HTML, CSS, JavaScript, Dreamweaver, Flash
  • Drove business growth through new opportunities, strategic plans, and market expansion partnerships
  • Managed client relationships ensuring high-quality, on-time project delivery