Looking for a job

Janyel Marrero Alvarez

@janyelmarreroalvarez

Message

Backend Engineer at SuperGuide building provider-agnostic booking and payment integrations across 4 external providers.

Portugal

Message

At SuperGuide, I built a provider-agnostic booking and payment integration layer supporting four external providers and more than 15 booking, availability, and payment workflows. I also implemented Python AWS Lambda endpoints and reservation flows designed around explicit state transitions.

Previously, at D'Nodarse, I built an e-commerce backend and admin platform and developed a recommendation service that increased CTR by 22%. At NTSprint, I built healthcare scheduling workflows and a Flask clustering service to optimize medical visit routes.

Experience

Work history, roles, and key accomplishments

Current

Senior Full-Stack Engineer & AI Tooling Lead

Current

SuperGuide

Jul 2025 - Present (1 year 3 months)

Built a provider-agnostic booking and payment integration layer supporting 4 external providers and 15+ workflows. Implemented 27+ Python AWS Lambda API endpoints and added 230+ automated tests.

Python AWS Lambda PostgreSQL NestJS NodeJS C#.NET Supabase Ventrata OCTO Bokun Paylands FareHarbor Cursor Agents MCP Docker GitHub Actions

Backend & Front-end Developer

D'Nodarse (E-commerce)

Aug 2022 - Sep 2024 (2 years 1 month)

Built a scalable e-commerce backend and admin platform using NestJS, Vue 3, MongoDB/PostgreSQL. Developed a content-based recommendation service that increased CTR by 22% and contributed to a 12% rise in average order value.

NestJS Vue3 MongoDB PostgreSQL Amazon Cognito JWT GraphQL REST Storybook GitHub Actions Docker S3 AWS ECS

Full-Stack Developer

NTSprint

Sep 2021 - Aug 2022 (11 months)

Built healthcare scheduling workflows using React and .NET Framework, improving clinician productivity by 60%. Implemented a K-Means clustering service in Flask to optimize medical visit routes, reducing travel time by 18%.

React .NET Next.js Redux Flask K Means Jest PostgreSQL GraphQL EC2 Docker

Backend, Full-Stack and ML Engineer

Freelance & Academic Projects

Developed a Kotlin backend for a farm-simulation game, trained and deployed a TensorFlow digit classifier as a Flask API, and built a Python/Django POS management system with printer SDKs.

Kotlin TensorFlow Flask Python Django POS Printer SDK

Education

Degrees, certifications, and relevant coursework

Ignacio Agramonte y Loynaz University

B.Sc., Computer Engineering

2020 - 2025

Pursued a B.Sc. in Computer Engineering, with a thesis on a data-analysis platform using NestJS and Nuxt.js, and coursework in Software Architecture, Systems Engineering, and Cloud Computing.