Open to opportunities

Leticia Massenan

@leticiamassenan

Message

Backend software engineer building scalable AI-powered fintech and healthcare systems with measurable impact.

Spain

Message

What I'm looking for

I am looking for backend or cloud roles where I can build reliable, AI-enabled systems at scale, work with strong engineering practices (TDD, CI/CD), and deliver measurable business and environmental impact.

I am a backend software engineer with 3+ years building scalable server-side applications and data processing systems for fintech, healthcare and transportation. I specialise in AI integrations, cloud-native architectures and automated testing, and have contributed to production systems serving 700,000+ users while delivering measurable business and environmental impact.

My work includes developing AI-powered student loan systems and robust data pipelines that helped generate $1.8 billion in projected student debt reduction and R$32+ million in cost savings, alongside significant CO2 reductions. I focus on reliability (99.9% system uptime), TDD, CI/CD and practical AI integration to deliver secure, maintainable solutions at scale.

Experience

Work history, roles, and key accomplishments

Current

Node.js & Python Developer

Current

Candidly

Jul 2022 - Present (3 years 11 months)

Co-developed an AI-powered Student Loan Retirement Match system, increasing first-time retirement plan participation by 13.5% and contributing to $1.8B in projected student debt reduction while processing millions of data points for 200,000+ active users.

Python TypeScript AWS Lambda OpenAI API Claude AI API Puppeteer Docker CI CD

Node.js Developer

Albert Einstein Hospital

Feb 2022 - Jul 2022 (5 months)

Developed a TISS health information exchange system processing 500,000+ procedures annually, delivering R$ 8M in annual cost savings, reducing billing time by 80% and maintaining 99.9% regulatory compliance.

Docker PostgreSQL Jest TDD Healthcare Integration APIs

Node.js & PL/SQL Developer

Trizy

Oct 2021 - Feb 2022 (4 months)

Maintained transport scheduling system serving hundreds of operators, contributing to R$ 15M annual savings, reducing driver wait times by 70% and cutting 2,000+ tonnes CO2 per year.

TypeScript Pl SQL Jest TDD Performance Optimization

Java/PHP Intern

ESIG Software

Oct 2020 - Sep 2021 (11 months)

Maintained a government digital transformation system serving 850K+ citizens, refactoring legacy features and reducing public costs by R$ 9M annually while enabling paperless inter-institution document processing.

Java 8 Spring Boot PHP (Laravel)PostgreSQL QA Refactoring Software Maintenance

Node.js Developer

Deliverful

Oct 2020 - Apr 2021 (6 months)

Built a scalable auction platform and driver hiring tools, launching in California with 2,000+ active users and reducing development time by 30% through Test-Driven Development.

TypeScript Firebase Docker Jest GitHub TDD Scalability