Sean Heo
Backend Engineering Lead @Buzzvil
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WORK HISTORY
Backend Engineering Lead @Buzzvil
Architected and implemented user-engagement modules within a rewarded-ad SSP, processing 23M+ events/day (Kafka/Go), including a real-time daily-quests system and a leaderboard serving 0.8M DAU- Spearheaded the build of a feature-flag and A/B testing system, accomplishing an organization-wide feature experimentation culture as measured by adoption across 500+ B2B customers- Saved per month in DynamoDB costs by reducing RCU usage by 96% through backend code refactoring and query optimization- Streamlined backend architecture by migrating legacy microservices into Go-based modular monolith- Architected and built a rule-based ad ranking pipeline, as measured by ~$2K/month revenue, using Airflow, AWS DynamoDB, and Amazon Athena- Built a scalable B2B push notification system with Argo Workflows and AWS RDS- Maintained API gateway servers on AWS EKS, meeting a 99.95% uptime SLO with observability via Prometheus, Loki, and Datadog- Led a 4-engineer team and built an observability-focused culture by adopting SLOs, setting up Datadog dashboards/alerts, and introducing canary deployment steps.
EDUCATION
Korea Aerospace University
Bachelor's degree, Business Administration
Korea Advanced Institute of Science and Technology
Non Degree Program, Computer Science
University of North Dakota
Bachelor's degree, Business Administration and Management, General
Korea National Open University
Bachelor's degree, Computer Science
ABOUT SEAN HEO
I’m a Software Engineer with 4 years of experience and a previous 3-year background as a Product Manager.My strength lies in building and operating large-scale, high-traffic backend systems with a strong sense of product ownership. I thrive in cross-functional teams, where I bridge the gap between business goals and technical execution.I take initiative to learn deeply, explore new technologies, and share knowledge to elevate my team’s technical maturity.Core Strengths & Interests • Product-minded software engineering • Cross-functional collaboration (PM, Design, Data, SRE) • High availability, scalability, performance optimization • Ownership across design, implementation, and reliabilityTech Stack & Keywords• Backend Development • Distributed Systems• REST/gRPC APIs• Kafka • Redis • MySQL/AWS DynamoDB/MongoDB• AWS EKS/Lambda/S3• Docker/Kubernetes • Prometheus, Grafana) • Observability • Service Reliability• System Design
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