Heemo Yang
Denver,CO
Summary
Results-oriented Site Reliability Engineer with extensive hands-on experience in operating and scaling distributed middleware systems for high-traffic streaming platforms. Expertise in enhancing production reliability, developing observability workflows, and automating deployment and infrastructure processes. Strong emphasis on Kubernetes-based service delivery, AWS infrastructure management, performance testing, and achieving operational excellence across multi-environment systems. Committed to optimizing system performance and ensuring seamless user experiences through a robust understanding of cloud computing, software development, and advanced scripting and automation skills.
Overview
3
3
years of professional experience
Work History
Site Reliability Engineer
SlingTV, Dish Network
Denver
02.2023 - Current
- Operate and support distributed middleware services handling 30K–200K requests per minute across 30+ microservices, ensuring high availability and reliability for streaming platforms serving millions of users
- Participate in on-call rotation (1 week every ~2 months), triaging alerts, investigating latency/SLO breaches, and resolving production incidents across multiple environments
- Led initiative to implement trace-to-log correlation by injecting trace identifiers into logs, significantly improving debugging speed and reducing time to root cause during incidents
- Built and maintained Dynatrace dashboards, SLIs, and alerting rules, enabling proactive monitoring of latency, error rates, and service health across environments
- Conducted load, stress, spike, and endurance testing using JMeter and BlazeMeter to validate system performance, identify bottlenecks, and guide capacity planning decisions
- Performed right-sizing and HPA tuning based on performance test results, optimizing CPU/memory utilization and improving service scalability under varying traffic conditions
- Onboarded and deployed multiple services to Kubernetes using Helm, ArgoCD, and GitLab CI/CD, configuring ingress routing, environment variables, and scaling policies
- Investigated and escalated infrastructure issues (e.g., Istio misconfiguration causing unexpected scaling behavior), collaborating with platform teams to resolve system-wide inefficiencies
- Contributed to AWS infrastructure provisioning using Terraform, creating and managing resources such as API Gateway, CloudFront, Lambda, DynamoDB, S3, and KMS
- Designed Terraform configuration structure and deployment workflows, including environment-based config patterns, Makefile automation, and state recovery/import processes
- Built internal automation tooling using Go and GitLab pipelines to manage repository approvals, branch rules, and operational tasks such as rolling restarts across namespaces
- Led service onboarding and infrastructure setup for new platform initiative (DANY project), delivering environments, pipelines, and deployment workflows across multiple clusters within tight timelines
- Drove improvements in deployment automation and operational workflows, reducing manual effort and improving consistency across environments
- Created documentation and led knowledge-sharing sessions on performance testing, capacity planning, and chaos/fault testing practices, mentoring engineers transitioning into SRE roles
Education
Advanced Software Engineering Certificate -
Hack Reactor
Remote08-2022
Bachelor of Science - Hospitality Management
University of Nevada, Las Vegas
06-2017
Skills
- Reliability Engineering: Incident Response
- On-call Operations
- Production Debugging
- Service Health Monitoring
- Root Cause Analysis
- High Availability
- Observability: Dynatrace
- Distributed Tracing
- Metrics & Alerting
- Log Analysis
- Trace-to-Log Correlation
- Performance Monitoring
- Cloud & Infrastructure: AWS (API Gateway, CloudFront, Lambda, S3, DynamoDB, DAX, EventBridge, KMS, Keyspace)
- Terraform
- Infrastructure as Code
- Kubernetes & Platform: Kubernetes
- Helm
- ArgoCD
- Service Onboarding
- HPA
- Ingress Configuration
- CI/CD & Automation: GitLab CI/CD
- Pipeline Automation
- Deployment Workflows
- Go (automation scripting)
- Bash
- Performance Engineering: Load Testing
- Stress Testing
- Spike Testing
- Endurance Testing
- Capacity Planning
- Right-Sizing
- Log analysis
- Scripting languages
- Microservices architecture
- Incident management
Languages
Korean
Native or Bilingual
Timeline
Site Reliability Engineer
SlingTV, Dish Network
02.2023 - Current
Bachelor of Science - Hospitality Management
University of Nevada, Las Vegas
Advanced Software Engineering Certificate -
Hack Reactor