# Mackenzie Stein > Senior Software Development Engineer at Rokt Location: Seattle, Washington, United States Profile: https://flows.cv/mackenziestein I'm a software development engineer at Rokt based in Seattle, Washington. ## Work Experience ### Senior Software Development Engineer @ Rokt Jan 2024 – Present | Seattle, Washington, United States ### Software Development Engineer @ Amazon Jan 2019 – Jan 2024 | Seattle, Washington, United States LLM-Powered Routines * Designed and implemented an LLM-driven service to create Alexa Routines, focusing on scalable, configuration-driven code which can handle hundreds of API formats. * Partnered with science teams to generate supervised fine tuning (SFT) and in-context learning (ICL) training data, evaluate model output, and overcome LLM limitations such as hallucinations and non-determinism. Altogether, increased model accuracy from 58% to 94%, unblocking project launch. Routine Recommendation Builder * Redesigned data stores and APIs used to suggest Routines to customers, accelerating recommendation creation, simplifying data contracts, and facilitating personalized recommendations and embedded upsells within Routines. * Led a team of 5 developers to build an internal website tool for no-code creation of Routine recommendations. Website reduced the creation timeline from 4 weeks to 1 week and enabled project managers to quickly build dozens of recommendations, driving adoption by millions of customers and achieving our yearly engagement goals. Leadership and Operational * Managed 2 full-time employees and 1 intern for 6 months and mentored multiple other entry-level engineers and interns. * Responded to customer-impacting experience-breaking events and addressed service operation issues as part of a cross-team on call rotation. ### Resident Counselor @ Amherst College Jan 2016 – Jan 2019 | Amherst, MA Live in student housing, acting as a constant resource for residents. Perform conflict mediation, daily guidance for residents, and budget management. Organize and lead events designed to help students transition to college and promote health and well-being. ### Teacher's Assistant and Tutor, Computer Science Department @ Amherst College Jan 2016 – Jan 2019 | Amherst, MA Work closely with the professor to prepare lectures, and both prepare and grade homework assignments and exams. Host help sessions open to all students and tutor students individually to explain concepts and help complete homework projects using Java, Python, and C++. Have worked as TA for: Introduction to Computer Science I & II, Computer Securities, Algorithms ### Software Development Engineer Intern @ Amazon Jan 2018 – Jan 2018 | Greater Seattle Area Designed and created a new Recommended Routine presented to all Alexa customers which detects customers’ Smart Home devices and initiates corresponding device actions in real time. Optimized GUI experience to decrease latency of the Routine homepage within the Alexa app. Wrote and presented documents detailing the design, architecture, and implementation of a new Recommended Routine. Programmed primarily in Java and Typescript, using React Native framework. ### Software Engineering Student @ Aquincum Institute of Technology (AIT-Budapest) Jan 2017 – Jan 2017 | Budapest, Hungary Study abroad program in Budapest, Hungary focused on computer science. Curriculum consisted of a Mobile Software Development course that focused on Android application development using Java and XML in Android Studio. Developed foundation of Android application designed to connect current students with alumni in a relevant field to set up job shadowing opportunities. GPA: 4.00 / 4.00. ### Software Engineering Intern @ Grove Collaborative Jan 2016 – Jan 2016 | San Francisco, California Generated a network of databases to store purchase order and vendor information using SQLAlchemy, Postico, and Heroku, and constructed a website supported by Flask to track, record, and edit this data using Python and HTML. Rectified and expanded calculations using Pandas to predict product sales, inventory stocks, and necessary product purchases to prevent inventory reaching out-of-stock levels. ### Engineering Intern @ Aqua Environment Co. Inc. Jan 2015 – Jan 2015 | San Rafael, CA Engineering internship focused on modernizing the manufacturing process of their products with a focus on computer aided design. Created 3-dimensional models used in production of back-pressure regulators using Autodesk Inventor CAD software. ### Tutor @ Marin Tutors Jan 2015 – Jan 2015 | Marin, CA Through the company Marin Tutors, I was paired with high school students around Marin who needed tutoring help. I worked particularly with students who needed help in math and science, subjects ranging from Algebra I and II, Geometry, Precalculus, Calculus, General Science, Chemistry, and Physics. ### Peer Resources @ Marin Academy Jan 2013 – Jan 2015 One of eighteen students selected from competitive applicant pool to join student group on campus that met weekly for training in facilitation and leadership skills, as well as event planning for the greater community. Responsibilities included planning and hosting speakers, open student meetings, panel discussions, and seminars with the goal of facilitating dialogue between parents, students, and faculty. Also held special programs to assist freshmen and new students transition to Marin Academy. Primary event each year was Communications Evening, an evening event attended by roughly 250 students and parents; members of Peer Resources performed monologues about high school life, and then facilitated discussions with groups of 20 students and parents. ## Education ### Double Major in Mathematics and Computer Science Amherst College Jan 2015 – Jan 2019 ### Marin Academy Jan 2011 – Jan 2015 ## Contact & Social - LinkedIn: https://linkedin.com/in/mackenzie-stein --- Source: https://flows.cv/mackenziestein JSON Resume: https://flows.cv/mackenziestein/resume.json Last updated: 2026-03-22