Elizabeth Margolis

Full-stack engineer building internal tools, ingestion engines, rendering systems, and AI-assisted workflows for SaaS platforms.

lizzie@lizzie136.com linkedin.com/in/eportillaf github.com/lizzie136

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Summary

Full-stack engineer with 5+ years of experience building internal tools, ingestion engines, rendering systems, and operational platforms for SaaS products. Experienced in AI-assisted engineering using Cursor, Claude Code, Copilot, and Aider. Available for contract roles ($125–$150/hr) or FTE, and ready to start on Monday 24th.

Technical Skills

Languages

JavaScript
TypeScript
Go
Python

Frontend

React
Next.js
Zustand
Redux
Storybook

Backend

Node.js
Express
GraphQL
REST
AWS Lambda

Systems

ETL pipelines
Ingestion engines
Amazon S3
CloudFront
GitHub Actions

AI / LLM

Copilot
Cursor
Claude Code
Aider
LLM prompt evaluation

Experience

Software Engineer

Nov 2022 — Nov 2025

Kiddom

Redesigned the curriculum ingestion workflow with a front-end ETL tool that transforms thousands of lesson files into structured JSON inside the Kiddom platform.
Built and maintained internal React + TypeScript tooling and web applications, improving accessibility compliance and classroom usability.
Resolved ingestion failures across S3, caching, and metadata syncing layers, boosting platform reliability.
Explored AI-assisted workflows including prompt evaluation/scoring, model comparison, and debugging LLM behaviors for internal tools.

Software Engineer Contractor

Sep 2020 — Nov 2022

Pinterest (via BairesDev)

Developed React/TypeScript interfaces powering internal dashboards across operational teams.
Improved reliability of API-driven flows by refactoring data-fetching patterns and reducing regressions.
Shipped full-stack features that integrated Node/GraphQL backend services.

Head Coach & Experimentation Engineer

2018 — 2020

Laboratoria

Designed a zero-to-one experimentation framework that taught agile and hypothesis-driven iteration.
Led technical programs in Mexico, managing curriculum delivery and instructor performance.

Earlier Roles

2013 — 2020

Able Co., Avantica, Telefónica Perú

Built React frontends, native iOS applications, and early ETL workflows supporting multiple business lines.

Ongoing Training

Python & SQL sharpening.
AI-assisted workflows with Cursor, Claude Code, Copilot, and Aider.
LLM prompt evaluation, scoring, and model comparison.

Education

Bachelor in Computer Science (Software Engineering)

Feb 2011

UPC (Peru) — Top 10th Percentile