# Leo Simmons > Software Engineer Location: San Francisco Bay Area, United States Profile: https://flows.cv/leosimmons Software engineer with a background in science. Experienced in distributed systems, web scraping, and machine learning. https://leosimmons.me ## Work Experience ### Software Engineer @ Cacheflow Jan 2022 – Jan 2023 Cacheflow is a B2B subscription billing management and CPQ solution. It was acquired by HubSpot in October 2024. I was employee number 5. I helped build the product from the early stages, working on all sides of the software: Java Spring, Node.js, React/Typescript, AWS, integrations. ### Software/Machine Learning Engineer @ Foxy AI Jan 2019 – Jan 2020 Foxy AI is a startup applying machine learning to the field of residential real estate. I worked part-time, then full-time, doing various types of software development: trained neural networks, built ML-based search engines, ran large-scale scraping jobs, built web apps and a chrome extension, created a microservice-based backend to service these systems. Used Python, Keras, PyTorch, Docker, React, Spotify's Annoy. Mentored junior engineers, worked with clients. ### Software Engineer @ WeWork Jan 2019 – Jan 2020 | San Francisco Bay Area Worked on various services powering access management in WeWork spaces. Worked with Golang, Java, Kubernetes, gRPC, Kafka. ### Contract Machine Learning Engineer @ Boston Deep Learning Jan 2019 – Jan 2019 Boston Deep Learning is a consultancy building various machine learning products. I worked on a project developing convolutional neural networks for a facial recognition app. Handled feature engineering, network architectural design, productionizing models. Blog post describing one of these models can be found at https://medium.com/@leosimmons. ### Software Engineer @ Si14 Inc. Jan 2017 – Jan 2018 | San Francisco Bay Area Si14 was a small consultancy that specialized in web scraping software. I worked as the primary developer of a scraping system where I wrote a scraping library in Python, deployed a distributed system in AWS to use the library to complete a large volume of scheduled and on-demand scraping jobs. Maintained a web app built with Backbone/Marionette, Python, Flask, and MySQL for users to interact with the scraping system. Integrated system with Loggly, TravisCI, AWS CodeDeploy for monitoring, testing, and deployment. ### Software Engineer Intern @ Harmony Jan 2016 – Jan 2016 | San Francisco Bay Area Interned at Harmony (formerly Set The Set), a musician platform, as a full stack developer. Worked with the MEAN Stack and the Spotify API to build a public-facing console for artists to use to create their own tour pages on https://settheset.com. ### Software Engineer Intern @ Waylz, Inc. Jan 2016 – Jan 2016 | Greater Boston Area Contributed to Waylz, a stock-trading app, as a full stack developer. Used AngularJS, Bootstrap, Flask, MongoDB, and SQLite to build an administrative console for users of the app. ### Undergraduate Researcher @ University of Massachusetts Amherst Jan 2014 – Jan 2016 | Amherst, MA Dr. Kathleen Arcaro's Lab, Department of Veterinary and Animal Sciences. -Researched genetics and epigenetics of drug resistance in breast cancer -Supported project studying tamoxifen resistance in breast cancer by testing gene expression and mutation status of tamoxifen-resistant cell lines - co-author on resulting publication, listed below -Led project profiling recurrent breast tumors for ESR1 mutations and correlating mutation status with methylation profile -Led project profiling CNA status of tamoxifen-resistant breast cancer cell lines using R ### Intern @ RIKEN Jan 2015 – Jan 2015 | Wako, Saitama, Japan Enzyme Research Team, Biomass Engineering Program. -Led project focused on chemically modifying silk proteins with enzyme catalyst – developed reaction protocol, characterized reaction products with spectroscopic and thermal analysis techniques, measured hydrophobicity of reaction products ### Associate in Research @ Baystate Health Jan 2014 – Jan 2015 In collaboration with research conducted in Arcaro Lab -Extract tumor tissue by laser capture microdissection, collect and organize patient disease histories ### Summer Research Assistant @ Tufts University Jan 2013 – Jan 2014 | Medford, MA Dr. David Kaplan's Lab, Department of Biomedical Engineering -Supported project researching silk fusion proteins to be used for biomedical applications - created gene chimeras with recombinant DNA techniques, produced fusion proteins in bacteria, and purified proteins with immobilized metal affinity chromatography ### Dockhand @ Charles River Canoe & Kayak Jan 2010 – Jan 2012 | Newton, MA Customer service, instruction on paddling technique and safety, boat maintenance, transfer of boats between company locations. ### Screen Printing Technician @ The Shirt Guys LLC Jan 2010 – Jan 2011 Printed custom apparel with silk screen technology. ## Education ### Bachelor of Science (BS) in Biochemistry and Molecular Biology University of Massachusetts Amherst ### Newton North High School ## Contact & Social - LinkedIn: https://linkedin.com/in/lsimmons3 - Portfolio: https://leosimmons.me --- Source: https://flows.cv/leosimmons JSON Resume: https://flows.cv/leosimmons/resume.json Last updated: 2026-03-30