# Junbeom Chi > Senior SWE @ Chartmetric | Prev @ SoFi | UC Berkeley Location: San Francisco Bay Area, United States Profile: https://flows.cv/junbeom Hi, good to meet you! I'm Junbeom (Jay) Chi - an engineer passionate about turning complex technical challenges into winning solutions! Senior Software Engineer with a proven track record of driving technical initiatives that deliver measurable business impact. Currently leading full-stack development initiatives and technical hiring at Chartmetric, where I've contributed to partnerships with Universal Music Group, Sony Music, and TikTok. My expertise spans the complete software development lifecycle - from architecting scalable backend systems to designing user-centric frontend experiences. I've successfully managed technical teams, conducted 39+ technical interviews, and onboarded 6+ engineers while maintaining hands-on development across modern tech stacks. Previous experience at SoFi, Samsung Electronics, and Square has equipped me with deep full-stack capabilities (Java/Kotlin + Spring, React + TypeScript, GraphQL, Flutter) and a strong understanding of fintech, payments, and enterprise software development. I'm passionate about building products that solve real business problems and am always interested in learning about new sectors where technology can create meaningful impact. Open to connecting with fellow engineers, product leaders, and anyone interested in discussing technology, product development, or career growth. Feel free to reach out at jbchi@berkeley.edu ## Work Experience ### Senior Software Engineer @ Chartmetric Jan 2025 – Present | San Mateo County, California, United States • Lead Sales Engineering as primary technical liaison between engineering and sales teams contributing to growth in sales and revenue • Manage comprehensive hiring processes, reviewing 113+ candidates and conducting 39+ technical interviews to successfully hire 3 full-time engineers • Onboard and supervise 3+ engineers including contractor management • Develop full-stack solutions across data, backend, and frontend systems supporting major client partnerships ### Software Engineer @ Chartmetric Jan 2024 – Jan 2025 | San Mateo, California, United States • Architect Stripe payment integration and implement mandatory subscription flows into user signup process, contributing to 11% ARR growth over 8 months • Enhance user experience and external API functionality based on customer feedback and feature requests • Develop scalable full-stack solutions using TypeScript, Node.js, Elasticsearch, and modern data infrastructure ### Software Engineer @ SoFi Jan 2023 – Jan 2023 | San Francisco, California, United States • Implemented promo tracker using React, GraphQL, and Kotlin/Spring increasing the spend active rate by 3%, improving customer experience, and saving $56,000/year for reducing strain from Operations team of over 500 calls with AHT of 725 seconds • Orchestrate multiple microservices to support internal rules engine track transactions in-house that was previously handled by 3rd party financial service; internalization saves $29,000/year • Developed API endpoints, shipped database migration, implemented unit/component/integration testing, and deployed to multiple components using Kotlin/Spring, AWS, postgresSQL, Kubernetes/Kraken, Postman, and Docker ### Data Science Researcher @ Square Jan 2023 – Jan 2023 | Berkeley, California, United States • Extracting insights from 30+ million Square’s Developer API activities to provide crucial data points to the company’s KPIs. • Data wrangling and analysis using PySpark and High Performance Computing due (Savio) • Investigating ML/Deep learning methods such as Auto-encoder to classify active API calls ### Software Engineer | Founding Member @ Stealth Jan 2022 – Jan 2023 | Seoul, South Korea • One of 8 founding members of an app service that allows users to easily track their dietary goals with 500+ downloads and 4.8+ star rating on Play Store • Participated actively in all stages of the application development lifecycle including ideation, market and user research, wireframing, design, and the development and deployment of the application. • Designed the overall database schema and MVC pattern; linked data to Firebase Cloud Firestore for future marketing use • Main feature responsible: managing user data, state magemement, and pages and features related to statistics (data visualization) ### Software Engineer @ Samsung Electronics Jan 2022 – Jan 2022 | Seoul, South Korea • Developed REST API with Java, Springboot, Hibernate, and MySQL to handle user information, payment method registrations for service that handles over 16.3 million users and 80+ payment gateway companies worldwide (Samsung Checkout, Samsung Wallet/Pay) • Shipped testing features to AWS EC2 server using a CI/CD process with Jenkins, Github, and Amazon Web Services (AWS) • Contributed to designing databases and table structures for Samsung Wallet’s transition into microservice architecture ### Data Analyst (Global Service) @ NAVER WEBTOON Jan 2022 – Jan 2022 | Gyeonggi, South Korea • Reported directed to CTO and Head of US Service to suggest new strategies and software features to improve “Aprils Fools” event • Operated data extraction, visualization, and data engineering for multi-departmental collaboration with Zeppelin, Hive, ImpalaSQL • Analyzed the Neftflix Effect of “The Sound of Magic (Annarasumanara)” and provided data analysis, visualization of achievements, and strategies for future Netflix launching of Webtoon original titles to Global Operation teams (EN, ID, TH, TW, SP, FR, DE) ### Data Analyst (Growth) @ 번개장터 (Bungaejangter Inc.) Jan 2022 – Jan 2022 | Seoul, South Korea • Automated routinely OKR tracking and updating process with 70% increase in work efficiency via Python and web crawling modules • Managed and built internal dashboard with SQL queries on Redash used for external contents (published magazine, articles ,etc.) and internal contents (OKR monitoring, visualization) with MySQL, PostgreSQL, Google Analytics, AWS Redshift, Google BigQuery • Conducted analysis project for Pareumje campaign held in 2021, analyzing the performance of the campaign, extracting insights on its success and effects on target audience; reported directly to COO and convinced her with reasons and strategies to re-run the campaign ### Research Assistant (Data Modelling and Analysis) @ Boston Consulting Group (BCG) Jan 2021 – Jan 2021 | Seoul, South Korea • Engaged in a consulting project in developing a business strategy and price optimization model for the client’s new Logistics business • Conducted database querying over 900,00 supply chain management data and performed data cleaning and visualization to extract useful insights in business decision-making, especially in price and cost optimization of the new business model via pandas, SQL, excel VBA ### Research Assistant @ PwC Jan 2021 – Jan 2021 | Seoul, South Korea • Engaged in formulating an execution strategy and profitability for the client’s entry into the recycling services market and suggested the short-term and long-term target market by estimating AM/TAM via financial reports and raw data • Conducted PEST analysis on each possible item to select and propose a target business item for our client’s new recycling business • Participated in benchmarking project to establish an IT infrastructure roadmap for a CDMO pharma company from leading practices • Collaborated with the PwC US offices, conducted expert interviews and drafted reports for company-wide internal discussions ### Squad Leader @ Republic of Korea Army Jan 2020 – Jan 2021 | Gyeonggi, South Korea • Served the Republic of Korea Army at the 8th Maneuver Division as squad leader, Infantry Fighting Vehicle (IFV) commander; discharged as Sergeant • Operated 10+ times of armored warfare trainings as squad leader of 10+ comrades to be selected for team of Expert Infantryman Badge. • Trained with CEOI/encryption/wireless network operations, K-1A handling, emergency medical aid and urban area operations ### Lab Assistant @ UC Berkeley Division of Computing, Data Science, and Society Jan 2019 – Jan 2019 | Berkeley, California, United States • Served as lab assistant/academic intern for Data 8 (Foundations of Data Science) • Assisted in solidifying knowledge on foundations of data science such as modeling, a/b testing, regressions, python, classification • Guided 30 students through weekly lab sections through worksheets and Jupyter coding assignments to assure students’ understanding • Led Q&A sections with UGISs to guide enhance students’ understanding in data science, python, and other materials of the course ## Education ### Bachelor's degree in Data Science: Business and Industrial Analytics University of California, Berkeley ## Contact & Social - LinkedIn: https://linkedin.com/in/junbeom-chi-230050180 --- Source: https://flows.cv/junbeom JSON Resume: https://flows.cv/junbeom/resume.json Last updated: 2026-04-01