Marco Rojas

Senior Software Engineer | Boston, MA

I'm a Senior Software Engineer building mobile products for healthcare and SaaS teams, specializing in React Native and delivering reliable, high-quality systems with scalable, maintainable architecture.

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Experience

Senior Software Development Engineer

IQVIA

• Mobile technical lead for iOS and Android delivery: managed user stories, backlog refinement, sprint planning, retrospectives, pull request reviews, and cross-functional release execution with product and design.

• Oversaw React Native platform upgrades in production, including enterprise Figma design token adoption, migration to the Fabric renderer, and phased Flow-to-TypeScript migration.

• Improved production stability, session crash rate fell from 18% to 0.2% through monitoring, hardening, and release planning.

• Defined system architecture and led a cross-functional initiative to add wearables to clinical trial workflows, from discovery and solution design to implementation, production rollout, and support for study teams.

• Contributed to open source in React Native Health, implementing Apple HealthKit atrial fibrillation (AFib) support from API design and implementation through release and partner integration.

• Accelerated new feature releases by 20% through cross functional integration of LLM tooling into the SDLC.

September 2023 - Present

Software Engineer

Human Care Systems

• Built and ran an integration engine moving data for 800k+ patients across vendors and pharmaceutical clients on Node.js and AWS.

• Managed fifteen HIPAA-regulated integrations end to end, from requirements and implementation through deployment and production support for PHI exchanged with external partners.

December 2019 - June 2022

Software Developer

Badaníe, Puebla, MX

• Directed end-to-end development and launch of a React Native iOS/Android app for store distribution and fraud control, owning UX, REST APIs, and Bluetooth label/receipt printer integrations for order, customer, payment, inventory, and routing workflows, driving a reported 99% fraud reduction, about 80% faster order processing, about 40% faster delivery, and a 20% revenue increase.

2016 - 2018

Skills

Languages and tools I use in production and in community teaching, with labels always visible so nothing depends on hovering an icon.

Programming languages & tools

JavaScript
MongoDB
Express.js
React
Git
Python
Flask
TensorFlow
Java
Docker
Linux

Where these map to experience & volunteering

Mobile & client — JavaScript, React, and related patterns: IQVIA (React Native lead, TypeScript and Flow migration); Badaníe (React Native iOS/Android app, REST, Bluetooth). Resilient Coders mentorship includes React for full-stack demos.
Backend, APIs & data — Node.js, Express, MongoDB: Human Care Systems (integration engine on Node.js and AWS); Portfolio microservices (Express and MongoDB on Glitch). Resilient Coders (Node, Express, MongoDB, React stack for cohort projects).
Languages & breadth — JavaScript, Python, Java, PHP: coursework and portfolio (algorithms across Python, C++, Java, JavaScript, Ruby); certifications below include JavaScript-focused tracks. Python ecosystem: Major League Hacking intro labs (Twitter API, deployment from notebooks).
Shipping & environments — Git, Docker, Linux: MLH Docker workshop series; Free Code Camp local leader for Node.js, Git, and front-end tracks; day-to-day production ownership at IQVIA and prior roles (reviews, releases, monitoring).
ML & web frameworks (learning & teaching) — Flask, TensorFlow: academic and side-project interest; strongest public tie is MLH Python AI intro sessions. See portfolio for OpenCV and image-processing work in C++.

Awards & Certifications

Volunteering

Software Engineer Mentor

Resilient Coders

• Mentors cohort engineers on full-stack delivery with Node.js, MongoDB, React, and Express.js: problem framing, incremental design, implementation, deployment, and demo-ready polish.

August 2019 - Present

Software Development Instructor

Major League Hacking

• Ran an "Intro to Docker" series, environment setup, image basics, and a capstone where participants containerized and shipped a small web app.

• Ran "Intro to Python AI" labs where attendees built and deployed a Markov-chain bot using the Twitter API and ethically sourced scraped data, from notebook to runnable service.

August 2018 - August 2019

Software Engineer Instructor

Free Code Camp

• Organized Node.js, Git, and front-end tracks for 300+ learners: recurring sessions, hands-on exercises that shipped small features, logistics, materials, and retrospectives.