# Siheon Lee

> Software Engineer @ Amazon | Distributed Systems & Microservices | Full Stack Development

Location: New York City Metropolitan Area, United States
Profile: https://flows.cv/siheon

I’m a software engineer with 5+ years of experience building and improving large-scale systems. At Amazon Web Services, I’ve worked on Just Walk Out post-purchase platform where I designed and delivered microservices that had to work reliably across multiple regions and store types. I enjoy taking ownership of hard technical problems — whether that’s redesigning a lookup system from the ground up or collaborating with product and operations teams to roll out features across different regions. My goal is to keep growing as an engineer who can design scalable, resilient platforms that solve real business problems.

## Work Experience
### Software Engineer @ Amazon
Jan 2022 – Present | New York City Metropolitan Area
• Led the end-to-end technical design and delivery of a new simplified receipt lookup system for RFID stores by expanding the existing microservices architecture, eliminating the dependency on credit card or bank statements
• Redesigned customer-facing post-purchase systems to improve reliability and reduce lookup times by up to 80% and significantly improving reliability for 20-30k daily users across time-sensitive environments (stadiums, event venues).
• Collaborated with cross-functional teams (product, legal, security, operations) to deliver region-specific invoicing and credit note features for the US, UK, Canada, and Australia, ensuring compliance across complex international requirements.
• Developed and deployed AWS-native solutions (SQS, Lambda, CloudWatch, S3, DynamoDB) for secure API integrations, token validation, and enhanced monitoring, improving platform resilience.
• Owned migration and onboarding for multiple post-purchase systems across Amazon Go, Fresh, third-party Just Walk Out stores, mentoring new developers and leading cross-team knowledge sharing.

### Software Engineer @ Walmart Global Tech
Jan 2020 – Jan 2022 | Reston, Virginia, United States
• Built and deployed compliance dashboards and behavior analysis tools, reducing operational cost by $1.6M through self-service capabilities and improved spend tracking.
• Developed full-stack features across backend (Java/Spring) and frontend (React) systems, supporting enterprise-scale US operations.

### Front End Lead Engineer @ BleuDot
Jan 2019 – Jan 2019 | Pittsburgh, PA
• Established by a group of 20 CMU students and is running an independent web application project of a platform for CMU students and organizations
• Led a team of five front-end engineers by coordinating weekly meeting schedules and planning sprints.
• Developed an event component for calendars in an internal calendar of BleuDot using Next.js

### Front-End Developer Intern @ Kakao Corp
Jan 2019 – Jan 2019 | Korea

### Full-stack Developer @ Carnegie Mellon University - School of Computer Science - Human-Computer Interaction Institute
Jan 2018 – Jan 2018 | Greater Pittsburgh Area
•  Designed and developed a stimuli-testing website for collecting data and creating algorithmic models concerning donor activities
•  Created 3 python applications for benchmarking the accuracy of algorithmic models

### Research Assistant @ Carnegie Mellon University - School of Computer Science - Human-Computer Interaction Institute
Jan 2018 – Jan 2018 | Greater Pittsburgh Area
•  Coordinated three playtests for live-streamed audience participation games in Twitch.tv platform observing audience behavior and usability of games.
•  Interviewed 3 Twitch.tv streamers about their usage and satisfaction level of live-streaming chatbots.

### Sales Product Development Assistant @ 숨고 (Soomgo)
Jan 2017 – Jan 2017 | Seoul, South Korea
- Designed three function upgrades of service by instituting user-centered research method and interaction-based prototypes during seven consecutive sprint projects
- Has tripled monthly revenue from sales team by building 4000 database of user information and enlisting 160 users to the service

** Soomgo, Inc. is an Online-to-Offline(O2O) platform service that matches service seekers and professionals/services on demand. https://www.soomgo.com

### Senior Radio Telephone Operator (Sergeant) @ United Nations
Jan 2015 – Jan 2017 | UNCSB-JSA, Panmun-jeom, South Korea
- Maintained situational awareness in operational areas of UNCSB-JSA by integrating and disseminating military movements from Korean and English radio communication
- Interpreted as a certified professional at major battalion events including monthly flag-hoisting   ceremonies, Remembrance commemorations for fallouts in JSA history
- Performed RTO oversight duty at escort operations covering distinguished visitors such as Vice President of the United States Mike Pence and the U.S. Secretary of State Rex Tillerson and three situational duties for inter-Korean talks in 2015


## Education
### Bachelor's degree in Human Computer Interaction
CMU Human-Computer Interaction Institute
Jan 2018 – Jan 2020

### Bachelor's degree in Information Systems
Carnegie Mellon University
Jan 2014 – Jan 2020

### Overseas Studying Program (OSP) in English
Hanyoung Foreign Language High School
Jan 2011 – Jan 2014


## Contact & Social
- LinkedIn: https://linkedin.com/in/leesihoney

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Source: https://flows.cv/siheon
JSON Resume: https://flows.cv/siheon/resume.json
Last updated: 2026-03-22