# Jack Tarantino > Lead Software Engineer Location: New York, New York, United States Profile: https://flows.cv/jacktarantino Jack Tarantino is an accomplished Software Engineer and Technology Leader. He has extensive experience with Frontend Web languages like HTML, CSS, JavaScript, Typescript, coffeescript, Jade, Elm, and Crystal. He has deep experience with frameworks like React, angular, Backbone, underscore, lodash, jQuery, Ember, Rails, Wordpress, Flask, Django, and Next.js. And indeed he's made core contributions to the CSS Specification, Wordpress, Wordpress plugins, Ghost blogging platform, angularjs, angularjs plugins, jQuery, infinitescroll, infinitescroll 2, Rails Plugins, Chrome Browser, and Chrome Plugins. He's an accomplished web security expert having consulted for some of the biggest security companies in the world with young experience in the security field, so to speak. Additionally he is very involved in the Generative AI movement and is an expert on AI security, AI implementations, and AI efficiency. Jack cares deeply about team development and runs conferences, meetups, newsletters, and lunch-and-learns as often as possible. Jack's past managers and peers have described him and his work as "technologically prescient", "a champion of efficiency", and "deeply caring". Jack enjoys a healthy blend of writing code, architecture design, leadership activities, and product design in his day-to-day. He has startup experience as small as a team of 4 up to fintech experience with America's leading banks, but he prefers mid-size companies for their opportunity and flexibility. When he has time, Jack likes to blog or write example code to help grow the open source engineering community in general. In previous lives Jack worked in photography, medicine, prestidigitation, crypto trading, and natural languages. ## Work Experience ### Senior Software Engineer II @ American Express Jan 2024 – Present | New York, New York, United States Developed and supported a group of platform-level software products written in JavaScript, Typescript, and Node. Mentored and supported hundreds of other engineers. Created and updated documentation across a dozen different projects. Developed an automatic Typescript module scaffolding system. Evaluated and tested new software products and versions against dozens of existing applications. ### Lead Software Engineer @ Janus Origins Jan 2022 – Jan 2025 | New York, New York, United States Built a team of 4 designers and developers to create dozens of webapps. Crafted local kubernetes cluster running on 13 physical computers, hosting over 400 LLMs to serve internal testing and hosting. Ran Prompt Response Testing against clusters of LLMs. Designed and Developed a web service to help Game Masters instantly create personalities and profiles for NPCs. Developed numerous custom-tailored "therapy bots" for clients with specific needs synthesizing LLMs and knowledge repositories to produce more specific and helpful results. Created a hardware stopsign-attached device to track traffic violation frequency for a new safety initiative. ### Principal Software Engineer @ Zipari Jan 2022 – Jan 2022 | New York, New York, United States Senior engineer on a team of 5 coding out web features, API layer features, backend support, and an ETL layer for an insurance intermediary. Rearchitected services to reduce duplicate code while still running in multiple environments. Coordinated deployments across multiple cloud providers and software stacks to satisfy client requirements. ### Senior Software Engineer @ Justworks Jan 2021 – Jan 2022 | New York, New York, United States Senior developer on a recently-acquired time-tracking software leading the integration of dozens of features. Worked with tech leadership across over 15 applications to standardize practices, code quality, engineering expectations, and integration plans for future acquisitions. Developed over 100 new features across a variety of frontend and backend applications. ### Lead Software Engineer @ MoneyLion Jan 2019 – Jan 2020 | New York, New York, United States Lead developer on rearchitecting the web onboarding flow. Made web onboarding flow 90% more efficient. Worked to improve conversion rates with A/B tests and analytics. Used analytics and tests to prove out A/B tests for onboarding and increased retention 110%. Mentored junior developers on best practices and was responsible for quality across several applications. ### Developer Advocate @ InRhythm Jan 2018 – Jan 2019 | New York, New York, United States Served as Developer Advocate (in this case a kind of Junior VP of Engineering), overseeing over 40 engineers across 5 teams. Wrote dozens of blog posts on engineering trends and dozens of newsletters for engineers and technical staff. Created presentations, ran over 10 meetups, created education and career-growth plans, and mentored in-person. Worked closely with the recruiting department to find and hire top-tier talent. ### Lead Software Engineer @ InRhythm Jan 2016 – Jan 2018 | New York, New York, United States Worked as the lead engineer delivering a complex documentation and onboarding website for Mastercard. The site was based on React and Node. Implemented code testing, taught test-driven development and personally wrote tests for ~30% of the codebase. Fixed large rendering performance issues reducing load time by up to 80% on initial pageload. Build out the team from 2 to 11 engineers, managing the entire team. — Worked as lead engineer with 4 others to deliver a top quality dynamic marketing application for American Express. The site is based on React and Node. Implemented server-side rendering in a massive established appllication. Later extended the architecture we developed to take over 2 other similar projects. Fixed or outright replaced build processes reducing build times by as much as 90%. Took the lead on code quality and maintainability, doing 100% of the code reviews at some points. ### Senior Software Engineer @ InRhythm Jan 2016 – Jan 2016 | New York, New York, United States Senior engineer delivering a complete marketing/commerce site for Hearst Inc. Completely redeveloped a leading marketing website from scratch using cutting-edge frontend software. Trained up a team of 3 new developers on how to maintain the site. Architected the whole frontend and API layer from scratch. Implemented testing solutions. Made the current build process, 60% more efficient, saving programmers hours every day. Responsible for the architecture of the application and coding out critical features. Lead lunch and learns on topics like RESTful API design and CSS frameworks. ### Software Engineer @ XO Group Inc. Jan 2014 – Jan 2015 | New York, New York, United States Traveled to and spoke at 4 conference about coding clean, coding quickly, and future code features to promote the company. Established internal code standards, increasing build performance by a minimum of 30% per team over 6 teams. Developed cross-org standards for code quality and implementation, increasing ROI on development by roughly 12%. Established a multi-platform deployment strategy that provided security, stability, and never had a single rollback. ## Education ### Bachelor of Arts - BA in French, Linguistics Michigan State University ## Contact & Social - LinkedIn: https://linkedin.com/in/jack-tarantino-378923297 - Website: https://jack.ofspades.com --- Source: https://flows.cv/jacktarantino JSON Resume: https://flows.cv/jacktarantino/resume.json Last updated: 2026-03-22