Kimon Stephanopoulos Email & Phone Number

Santa Barbara, California, United States

- Pitched and led a relational data model and pipeline refactor for the Sports category over 9 months, improving query success rate by 5% and dropping team maintenance load from 10+ hours/week during peak sports seasons to <2 hours.- Took the lead on integrating ML-based NLU systems in Alexa's information vertical in 2023, developing data products that enabled thoughtful risk assessments and recommendations to leaders up to the VP level, and allowing ML techniques to increase their… Show more - Pitched and led a relational data model and pipeline refactor for the Sports category over 9 months, improving query success rate by 5% and dropping team maintenance load from 10+ hours/week during peak sports seasons to <2 hours.- Took the lead on integrating ML-based NLU systems in Alexa's information vertical in 2023, developing data products that enabled thoughtful risk assessments and recommendations to leaders up to the VP level, and allowing ML techniques to increase their traffic share from 4% to 11% in 3 months at no cost to precision.- Led the migration of Sports data to Alexa's new generative AI-based architecture from the front, by refactoring the ontology & data pipelines from a bespoke relational database system to a stack including AWS S3, Neptune graphs, and Python.- Owned the integration of new, generative AI-enabling information retrieval systems into the Information vertical in 2024. This included identifying KPIs for the new stack, developing analytics pipelines and processes for semi-automated metric reporting, and driving software and science solutions to identified failure spaces, leading to performance improvements on the order of tens of percentage points across multiple components. Show less

Santa Barbara, California, United States

- Owned metric definition, process development, technical education, and technological enablement for KEs, in support of forward-looking Alexa-wide business requirements, such as response precision and engagement lost from high latency.- Developed analytics pipelines for 4 novel metrics using AWS Redshift, ETL tooling, and advanced SQL, distilling business requirements into easily-comprehensible reports used for both strategic and operational decision-making.- Raised the bar on… Show more - Owned metric definition, process development, technical education, and technological enablement for KEs, in support of forward-looking Alexa-wide business requirements, such as response precision and engagement lost from high latency.- Developed analytics pipelines for 4 novel metrics using AWS Redshift, ETL tooling, and advanced SQL, distilling business requirements into easily-comprehensible reports used for both strategic and operational decision-making.- Raised the bar on architecture designs across Alexa's relational database systems, ETL pipelines, and NLU/NLG systems by leading reviews for 70 KE projects, distilling and documenting best practices and mentoring peers at every opportunity.- Managed a high-visibility bug bash program for a flagship Alexa feature launch with an ambiguous failure space and complicated tech stack by diving deep into system breakpoints, authoring debugging documentation and delegating tasks based on data-driven prioritization, cutting defects by 50% in less than one month and unblocking launch. Show less

Santa Barbara, California, United States

- Owned the performance of Alexa's knowledge graph (KG) in the ANZ region. Created ETL pipelines to clean and structure data for voice answers, increasing KG contribution to query success in ANZ from 3.8% to 19.1% in one year.- Prioritized work by analyzing customer data using SQL queries against AWS Redshift databases, and built self-serve analytics tooling to allow KE teams to estimate a planned project's uplift to query success rate, working alongside business intelligence engineers to… Show more - Owned the performance of Alexa's knowledge graph (KG) in the ANZ region. Created ETL pipelines to clean and structure data for voice answers, increasing KG contribution to query success in ANZ from 3.8% to 19.1% in one year.- Prioritized work by analyzing customer data using SQL queries against AWS Redshift databases, and built self-serve analytics tooling to allow KE teams to estimate a planned project's uplift to query success rate, working alongside business intelligence engineers to define report schemas and optimize queries.- Drove software releases with worldwide impact by abstracting ANZ customer needs into global user stories, scoping requirements alongside product managers and software engineers and building the underlying data pipelines that enabled them, such as giving Alexa the ability to spell words in different language conventions. Show less

Washington D.C. Metro Area

• Conducted rigorous, data-driven research into the impact of emerging technologies on national security, including fields such as cybersecurity, telecommunications, autonomous vehicles, and space militarization. • Rapidly built understanding of the technical and geopolitical aspects of each issue, and created compelling and accessible data visualizations and memoranda to inform the team’s policy recommendations.• Leveraged engineering knowledge base to contribute a deeper level of… Show more • Conducted rigorous, data-driven research into the impact of emerging technologies on national security, including fields such as cybersecurity, telecommunications, autonomous vehicles, and space militarization. • Rapidly built understanding of the technical and geopolitical aspects of each issue, and created compelling and accessible data visualizations and memoranda to inform the team’s policy recommendations.• Leveraged engineering knowledge base to contribute a deeper level of technical diligence to research products. Show less

Washington D.C. Metro Area

St. Louis, Mo

• Led uncertainty quantification/sensitivity analysis research into common turbulence models, to assess the reliability of results produced by these models and improve their efficiency, guided by Dr. Ramesh Agarwal. • Tested two turbulence models commonly used in industry, and one new model developed at Washington University in St. Louis, each across 3 classical CFD test cases, using the ANSYS Fluent flow solver.• Wrote Python and MATLAB programs to automate setup, execution, and data… Show more • Led uncertainty quantification/sensitivity analysis research into common turbulence models, to assess the reliability of results produced by these models and improve their efficiency, guided by Dr. Ramesh Agarwal. • Tested two turbulence models commonly used in industry, and one new model developed at Washington University in St. Louis, each across 3 classical CFD test cases, using the ANSYS Fluent flow solver.• Wrote Python and MATLAB programs to automate setup, execution, and data visualization from 100+ flow simulations for each test case, creating the first integrated UQ framework at Washington University in St. Louis.• Published "Uncertainty Quantification of Turbulence Model Coefficients in OpenFOAM and Fluent for Mildly Separated Flows," 46th AIAA Fluid Dynamics Conference, AIAA AVIATION Forum (AIAA 2016 4401).Washington University's Computational Fluid Dynamics lab, led by Dr. Ramesh Agarwal, is currently conducting a wide variety of projects of major relevance to aerodynamicists worldwide. While mainly focused on optimisation of aerodynamics surfaces for improved flow-structure interaction, the lab is currently involved in broader topics such as uncertainty quantification of turbulence models for a variety of subsonic and supersonic flow problems. Show less

Greater St. Louis Area

• Provided first responder and basic life support level care to all persons within the boundaries of the University’s Danforth and Residential Campuses, on call 24 hours/week, 2153 hours total.• As a senior medic, routinely gathered information from patients under duress, determined appropriate course of care, coordinated small teams to provide quality treatment, and cooperated with local paramedics as needed.• Accelerated and improved team operations as Assistant Field Director:… Show more • Provided first responder and basic life support level care to all persons within the boundaries of the University’s Danforth and Residential Campuses, on call 24 hours/week, 2153 hours total.• As a senior medic, routinely gathered information from patients under duress, determined appropriate course of care, coordinated small teams to provide quality treatment, and cooperated with local paramedics as needed.• Accelerated and improved team operations as Assistant Field Director: revamped the training curriculum, created a fast and effective performance evaluation framework, and developed technically accurate and easily digestible documentation on how to operate critical equipment.The Washington University in St. Louis Emergency Support Team (EST) is a student-run volunteer emergency service that provides first-line care to the Washington University community. EST maintains a three-person duty crew, of whom at least two are licensed EMTs, active on campus throughout the academic year. Crews generally respond to all manner of incidents (generally over 300 per semester) within five minutes. More information available at http://est.wustl.edu/ Show less

Cambridge, Ma

• Conducted experiments pertinent to the application of flapping-wing flight to marine sensing vehicles in the MIT Towing Tank, an experimental hydrodynamics research laboratory led by Dr. Michael Triantafyllou• Researched principles of flapping-wing aerodynamics to make appropriate design modifications to initial prototype; used test results from prototype wing to conceive and design new mechanism using SolidWorks• Fabricated new wing using tools including the lathe, CNC mill, and OMAX… Show more • Conducted experiments pertinent to the application of flapping-wing flight to marine sensing vehicles in the MIT Towing Tank, an experimental hydrodynamics research laboratory led by Dr. Michael Triantafyllou• Researched principles of flapping-wing aerodynamics to make appropriate design modifications to initial prototype; used test results from prototype wing to conceive and design new mechanism using SolidWorks• Fabricated new wing using tools including the lathe, CNC mill, and OMAX Waterjet systemMIT's Ocean Engineering laboratory conducts bio-inspired research into the design of pressure sensors, hypermaneuverability of ocean vehicles, flow-structure interactions, vortex-induced vibrations and advanced mechanical design for ocean vehicles. The MIT Towing Tank, Ocean Engineering's central facility, is an experimental hydrodynamics laboratory consisting of two tanks and a wealth of imaging, data gathering and analysis equipment. More information available at http://web.mit.edu/towtank/www/index.html Show less

Greater St. Louis Area

• Led a minimum of 4 hours of help sessions a week and graded all homework assignments • Organized and conducted extra review during exam weeks papers• Collaboratively taught the class with colleagues when the professor was busy• Dynamics students in the Spring of 2014 had a collective average of 92% with a standard deviation of 10%, and reported high satisfaction with the Teaching Fellow programThe Teaching Fellow program in Washington University's School of Engineering is… Show more • Led a minimum of 4 hours of help sessions a week and graded all homework assignments • Organized and conducted extra review during exam weeks papers• Collaboratively taught the class with colleagues when the professor was busy• Dynamics students in the Spring of 2014 had a collective average of 92% with a standard deviation of 10%, and reported high satisfaction with the Teaching Fellow programThe Teaching Fellow program in Washington University's School of Engineering is a way to ensure students have a wealth of opportunity to master the concepts presented to them in lecture. Teaching Fellows are generally students who have demonstrated mastery of the subject material and who have been deemed good candidates to instruct new students in the subject matter. Show less

Bachelor Of Science (B.S.), Mechanical Engineering

Activities and Societies: Tau Beta Pi, Club Rock Climbing, Club Tennis, Emergency Support Team (see above for details), Sigma Iota Rho.

High School

Activities and Societies: Varsity Tennis, Global Leadership Program, Junior & Senior Mentorship Program