Sebastian Blanco Quesada
@sebastianblancoquesa
I build secure full-stack applications with .NET, React, and cloud services.
Costa RicaWhat I'm looking for
I built backend services and Razor Pages interfaces for Costa Rica's national securities exchange, delivering a regulated disclosure pipeline that removed 80% of manual data entry.
I redesigned secure AWS document storage with S3, CloudFront signed URLs, and IAM access controls, cutting storage and retrieval costs by 90%. I also improved test coverage by 60% and found five defects before release.
I independently built Jalemos, a .NET 8 and React Native carpooling app, from its PostgreSQL-backed REST API to a deployable Android client. I also fine-tuned a 518M-parameter speech model for an accessibility research project.
Experience
Work history, roles, and key accomplishments
Software Engineering Intern
Grupo Financiero Bolsa Nacional de Valores
Mar 2026 - Jul 2026 (4 months)
Built a data acquisition pipeline in C#/ASP.NET Core for regulatory disclosures, removing 80% of manual data-entry effort. Implemented secure document storage on AWS S3 with CloudFront signed URLs, cutting costs by 90%.
Education
Degrees, certifications, and relevant coursework
University of Costa Rica
Bachelor of Science, Computer Science
2021 -
Pursuing a Bachelor of Science in Computer Science with an emphasis in Software Engineering, expected to complete in 2026.
Microsoft
Career Essentials in Data Analysis, Data Analysis
In progress, 2026: SQL and data-analysis fundamentals toward the Microsoft-recognized certificate.
IBM
Artificial Intelligence Fundamentals, Artificial Intelligence
In progress, 2026: machine learning, deep learning, NLP, and AI ethics, with an IBM-issued digital credential.
Anthropic
Claude Academy: Claude 101 & Claude Code 101, Artificial Intelligence
Completed coursework on the Claude API, prompt engineering, and Claude Code workflows.
Availability
Location
Costa RicaAuthorized to work in
Salary expectations
Social media
Skills
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