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Matias Guajardo

@matiasguajardo

Full Stack Developer specializing in legacy refactoring and multi-tenant SaaS with NestJS, Angular, and Oracle/PostgreSQL.

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What I'm looking for

I’m looking for remote, hybrid, or on-site work where I can keep delivering production REST APIs and real-time features, refactor legacy systems, and integrate strongly with relational databases in a team that values clean architecture.

I’m a Full Stack Developer with hands-on production experience, specialized in legacy system refactoring, multi-tenant SaaS architecture, and relational database integration. My core stack is NestJS, Angular, TypeScript, PostgreSQL/Oracle DB, Python, Docker, and CI/CD.

At Universidad de Talca, I built REST APIs in NestJS for Accreditation and Research Management with JWT authentication and real-time communication via Socket.io, integrating Oracle DB through 70+ PL/SQL triggers and reaching 99% OpenAPI/Swagger coverage. I loaded already-cleaned Accreditation data into Oracle (+50 tables), and migrated Research Management data to a new schema via a Python ETL pipeline (extraction, cleaning, loading) with no data loss or breaks in historical integrity.

I refactored legacy PHP and PL/SQL into Angular/NestJS, completing 80% of the Accreditation migration and 60% of the Research Management migration while reducing technical debt and recurring production incidents. I also handled after-hours deployments to fix a real-time concurrency bug, translated progress into plain language for non-technical stakeholders, and previously built and launched an e-learning platform with secure infrastructure and incident response during sustained DDoS attacks.

Experience

Work history, roles, and key accomplishments

Full Stack Developer

Universidad de Talca

Apr 2025 - Feb 2026 (10 months)

Built REST APIs in NestJS for Accreditation and Research Management, integrating Oracle DB via 70+ PL/SQL triggers with JWT authentication and Socket.io real-time communication, reaching 99% OpenAPI/Swagger coverage. Refactored legacy PHP/PLSQL into Angular/NestJS, completed major data migrations using a Python ETL pipeline, and addressed production concurrency issues through after-hours deploymen

NestJS REST APIs JWT Socket.IO Angular TypeScript Oracle Database Python ETL Legacy PHP Refactoring

Degree Thesis Project

Universidad de Talca

Apr 2024 - Dec 2024 (8 months)

Refactored a legacy university system by migrating it to Angular and NestJS backed by Oracle DB as part of the Business Informatics Engineering thesis at Universidad de Talca.

Angular NestJS Oracle

Independent IT Consultant

Titans Coaching

Aug 2023 - Jan 2024 (5 months)

Built an e-learning platform for an international client using WordPress and WooCommerce, including 3+ courses with protected content, payments, and memberships. Deployed infrastructure on AWS Amplify with Route 53 DNS and secured the site using Cloudflare, coordinating incident response during sustained DDoS attacks to maintain uptime.

WordPress WooCommerce AWS Amplify Route 53 Cloudflare SSL Payments Integration Memberships Protected Content Incident Response

Education

Degrees, certifications, and relevant coursework

Universidad de Talca

Bachelor's Degree, Management Sciences and Information Technology

2020 - 2025

Completed a Bachelor-level degree in Management Sciences and Information Technology at Universidad de Talca.

Universidad de Talca

Business Informatics Engineer, Business Informatics Engineering

2020 - 2025

Earned a Business Informatics Engineering degree, including a thesis project refactoring a legacy university system and migrating it to Angular and NestJS over Oracle DB.