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Alberto Fallas

@albertofallas

Backend & AI Engineer at Amazon Web Services who shipped production tools and built a RAG fitness coach grounded in training transcripts.

Costa Rica

Message

At Amazon Web Services, I designed, built, and maintained internal applications in Python and JavaScript across the development lifecycle. I shipped features and fixes for production tools used daily by operational teams.

Before that, I worked in account verification and billing at Amazon Web Services, investigating account access and compliance cases and resolving billing discrepancies.

I built FitNerd, a RAG-powered AI fitness coach that answers from a curated library of training-video transcripts. It uses Voyage AI embeddings in pgvector and Claude for generation, with a fallback response when the source material doesn't support an answer.

I also built a Claude Code plugin for Spec-Driven Development and validated it end to end on Salary Calculator CR. I'm an AWS Certified Solutions Architect – Associate, and I use Claude Code and Spec-Driven Development to bring rigor to AI-assisted software.

Experience

Work history, roles, and key accomplishments

Tool Builder

Amazon Web Services

Nov 2024 - Nov 2025 (1 year)

Designed, built, and maintained internal applications using JavaScript and Python across the full development lifecycle. Automated build, deployment, and versioning workflows and partnered with stakeholders in an Agile/Scrum team.

JavaScript Python Agile Scrum Internal Tools Automation Deployment Versioning

Account Verification Specialist

Amazon Web Services

Jul 2021 - Nov 2024 (3 years 4 months)

Analyzed account data and documentation to detect fraud risk and compliance issues, handling sensitive customer data with high accuracy at scale. Investigated and resolved account verification and access cases, collaborating with security teams.

Fraud Detection Compliance Data Analysis Customer Data Security Case Management

Billing and Accounts Specialist

Amazon Web Services

Nov 2019 - Jul 2021 (1 year 8 months)

Advised customers on AWS pricing models and billing structures, building deep knowledge of cloud cost management. Analyzed billing and account activity data to identify and resolve discrepancies.

AWS Billing Pricing Cost Management Data Analysis Customer Advisory

Customer Service Representative

Amazon

Jul 2016 - Nov 2019 (3 years 4 months)

Resolved customer order, refund, and account issues in a high-volume, multi-case support environment.

Customer Service Order Management Refunds Account Support High Volume

Education

Degrees, certifications, and relevant coursework

Universidad Americana (UAM)

Bachelor's Degree, Systems Engineering

2020 - 2026

Bachelor's degree in Systems Engineering (Computer Science) from Universidad Americana, San Pedro, San José, Costa Rica, from January 2020 to January 2026.