Efren Carbajal

Full-stack Engineer • Mobile Developer • AI & Machine Learning Engineer • Guadalajara, Jal., MX

Next.js

React

Full Stack Development

Available for hire fromNegotiable

Contracts

Software Engineer | Instituto Tecnológico Graduate

With a degree from Instituto Tecnológico y de Estudios Superiores de Monterrey, I have a strong foundation in software engineering. I have honed my skills as a Software Engineer at BentoBox, where I am responsible for developing and maintaining software solutions for the company's platform. My education and experience have equipped me with the knowledge and expertise to excel in the field of software engineering.

Work History

Full-Stack Engineer

BentoBoxJun 2022 - Aug 2023 • 1 yr 3 mosWorked as Software Engineer as part of the Content Management System team in adding new functionality and improving User Experience (UX) for all our users. All features develop on my roles as backend or frontend developer are being used by thousands of clients and tens or hundreds of thousands of clients of clients. Backend role: develop new endpoints and optimize existing ones using Django, Django REST framework and PostgreSQL. Frontend role: develop user interfaces with React, Redux, Material UI, styled components and Typescript. Main contributor to project with 100% test coverage and Typescript with strict mode.

Lead Developer

UnalenguaFeb 2021 - Jun 2022 • 1 yr 5 mosCreated a phonetic transcriber with top-class UX from scratch that it is been used by user across the world. Backend role: Building, deploying and monitoring two Restful APIs from scratch in Flask and ExpressJS. The first API (Python) was designed to provide the core functionality of the system: Transcribing input text from 10 different natural languages to International Phonetic Alphabet (IPA) Characters. The second API was designed to provide Text-To- Speech (TTS) capabilities to the system. Backend role: Integrations with AWS: S3 and Polly services, as part of the TTS API. Database design schema in Postgresql, monitoring server performance. Frontend developer role: Build a Single Page Application with Vue, Vuetify, vue-cli, turn it into a PWA/Jam-stack and publish it to Apple, Google and Microsoft stores. Build a Chrome extension based on the same PWA. Product owner role: identifying the issues to solve, elaboration of the problems into issues, prioritizing them into the backlog, constant communication with the team members, decision making

Full-Stack Developer

PipefySep 2021 - Feb 2022 • 6 mosWorked as part of the team responsable of modules like reports, filters, tables, exports and dashboards inside Pipefy's product. Worked on a big Rails monolith system. Both on legacy code but also implementing new functionality. Using Postgresql and Graphql. Backend role: Work on a new feature Formula field that provides excel like calculation capabilities to the Workflow system (Main system) built with Rails. Adapt and extend current Restful API to support new Formula Field. Adapt and extend existing Graphql API to support new Formula Field. Frontend role: Build and fix dashboard features and bugs with React, typescript, cubejs and recharts. Features like support for Running total calculations and horizontal bar charts.

Full-Stack Developer

UCSFOct 2018 - Sep 2020 • 2 yrsWorked onsite UCSF Cardiology research building. Building big multi-tenant Ruby on Rails system or what they called Eureka platform. Among other things I collaborated in: Integration that consists of extending the existing open-source Survey’s module (core functionality of the system) with the Admin authentication (Two Factor Auth) so admins could also fill out complex forms. Extend existing Restful API, built with Rails, that communicates with native iOS and Android apps to support new admin survey functionality Coordinate with principal designer to develop a Design System. Develop user interfaces using Component Driven Development with Ruby and Vanilla Javascript. Integration of micro frontend built with React and D3 into main Rails app. Provide mentoring to junior developers.

Education

Instituto Tecnológico y de Estudios Superiores de Monterrey

Bachelor of Engineering, Industrial and Systems EngineeringAug 2004 - Dec 2008

Instituto Tecnologico y de Estudios Superiores

Master of Science, Artificial IntelligenceJan 2009 - Jul 2011

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