# Siena Guerrero > Software Engineer @ Handshake Location: Culver City, California, United States Profile: https://flows.cv/siena LA-based; do not contact me about roles in SF or NYC. — Product-driven Full-Stack Engineer passionate about web accessibility and user engagement. I like to work with people who appreciate the power of collaboration and community. I’m currently working on activation and acquisition at Handshake, supporting user sign-up and onboarding in our core application and Handshake AI. Prior work includes building an internal large-scale notifications ecosystem. I use a bit of Golang with a lot of Ruby and React! • 5 Years: JavaScript/React, Postgres, GraphQL, Jest • 4 Years: Ruby/Rails • <2 Years: Go • Other Languages/Frameworks I've Used Outside of Work: Python, Next.js, Django, Bootstrap, C++, Java ## Work Experience ### Software Engineer @ Handshake Jan 2022 – Present • Daily Tools: React, GraphQL, PostgreSQL, Figma • Languages: mix of Ruby (on Rails), Go, Typescript Current Squad: Acquisition & Activation - Full-stack team focused on supporting login/sign-up for new users. Collaborates with Handshake AI to support activation flows for fellows. Support web accessibility goals comapany-wide. — Growth, Retention & Notifications • Full-stack development maintaining pre-existing product surfaces (homepage, user notifications inbox, user notifications preferences, onboarding) in monolith Ruby on Rails environment. • Participated in on-call rotation to ensure homepage maintains uptime for periods of high (~500K DAU) and low (~200K DAU) traffic and scale GCP Memorystore Redis instance for in-app notifications accordingly. • Led the front-end migration of legacy pages (user notification inbox and preferences) from Knockout to React. • Migrated existing endpoints from REST APIs to company's new standardized architecture using Apollo GraphQL. — Platform Services, Notifications • Contributed to and maintained Handshake’s new central notifications system in Go that processes ~110M emails/month, ~6M push notifications/month. System handles low/high priority delivery queues and supports ~3M emails/week for new job alerts during peak traffic. • Built admin user tools for managing and testing user notifications. • Supported marketing efforts with email and push campaigns (~30M emails and ~6M push monthly) in Iterable by providing backend assistance with API integration for user syncing and campaign triggering. • Led the migration of high-volume transactional emails (e.g., registration approvals, event reminders) from legacy systems to Handshake’s new central notification system, improving deliverability, template management, and engagement tracking. • Ran experiments on changes in notification content (e.g. subject line changes for new job alerts) to measure user impact. ### Software Engineer @ Swoop, Inc Jan 2020 – Jan 2022 • Founding engineer for all-in-one Software-as-a-service (SaaS) platform, Moovs, used by operators in the group transportation industry. • Helped build engineering team from 3 to 9. • Integrated Twilio, Mapbox, Flightradar24, and other third party API tools requested by consumers post MVP. • Daily Tools: React, Typescript, GraphQL, Postgres, Node.js, Figma ### Engineering Intern @ Swoop, Inc Jan 2019 – Jan 2020 | Greater Los Angeles Area • Assisted engineering architect to build from Proof of Concept to Minimum Viable Product (MVP) during Seed round of fundraising. • Aided in recruiting and operations within small, scrappy team post Seed round fundraising. • Conducted interviews with consumer and design/product to develop features with users in mind. ### Wellness Peer @ Harvey Mudd College Jan 2017 – Jan 2019 • Coordinated wellness events and other popup wellness activities on campus. ### Grader and Tutor @ Harvey Mudd College Jan 2017 – Jan 2019 | Claremont, California, United States • Graded homework and tutored students in computer science. • Learned chemistry and math by grading homework for freshman students. Only slightly joking here. ### Student Intern @ Harvey Mudd College Jan 2016 – Jan 2019 • Answered phones, made appointments, delivered mail, and worked on student projects for college's Facilities & Maintenance department. ## Education ### Bachelor of Science (B.S.) - incomplete in Computer Science Harvey Mudd College Jan 2016 – Jan 2019 ### Robinson Secondary ### Stratford Academy ### Albuquerque Academy ## Contact & Social - LinkedIn: https://linkedin.com/in/sienaguerrero - Website: https://www.sienaguerrero.com --- Source: https://flows.cv/siena JSON Resume: https://flows.cv/siena/resume.json Last updated: 2026-03-29