Sang Won (Wonnie) Sim

**** ********** **. **** ****, Boston, MA 02130 / adi3vg@r.postjobfree.com / 401-***-**** PROFESSIONAL EXPERIENCE

Polo Digital Assets, Ltd (Poloniex) Boston, MA

Senior Site Reliability Engineer Nov 2019 – present

• Built, maintained, and migrated AWS infrastructure for 15+ cryptocurrency wallets and dependent services

- Updated to use S3/CodeBuild for an in-house Java artifact management system from Artifactory service

- Separated out SSM secrets based on usage (db migrations vs. application) for enhanced security

• Migrated trading platform and exchange services from AWS US to AWS EU region with 6hr downtime

- Included: VPC, VPC peering, security groups, MySQL/Postgres databases users & grants, and cross-region deployment pipelines

• Built a specialized variant of an existing service using AWSVPC & NLB to restrict the access tighter

• Led cost savings by optimizing resource allocations and researching AWS Capacity Provider/spot instance

(staging: 87% less, production: 32% less)

• Setup and built cross-account, cross-region AWS deployment pipeline to facilitate data extraction/replication

• Built ECS monitoring lambda to detect ECS task failures and capacity insufficient issues in real-time

• Automated an on-demand loadtest environment and set up a new IAM role to manage the environment securely

• Maintained production services and exchange infrastructure and day-to-day operations

• Performed regular on-call rotations and troubleshot any emergency production and development issues

• Troubleshot and upgraded cryptocurrency nodes

Circle Internet Financial Boston, MA

Senior Site Reliability Engineer Jul 2019 – Oct 2019 Site Reliability Engineer Jun 2018 – Jun 2019

• Built a cloud infrastructure for SeedInvest (acquired) including new environments and CI/CD pipelines

• Moved Poloniex exchange’s technical infrastructure from a custom data center to a scalable AWS Cloud

• Setup multiple testing environments, including CI/CD pipelines, for Poloniex’s infrastructure

• Implemented a data-lake infrastructure including encrypted cross-account data transfer

• Upgraded internal authentication/authorization services to be more secure using SAML 2.0/single sign-on Kyruus Boston, MA

Software Engineer (Pipeline Team/Client Engineering Team) Jul 2016 – May 2018

• Resolved post-sale implementations and support tasks for 20 customers, 170+ data sources

• Implemented data scraping, parsing infrastructure (python), and ElasticSearch index configurations

• Lead developer for in-house customer data management app to set up new customer accounts and data sources DevOps Engineer Sep 2015 – Jul 2016

• Lead developer for in-house web app to create AWS CloudFormation (CFN) stacks with partial pre-configs, and manage/deploy their code to existing stacks (flask, angular.js)- deploy history, DNS records, last ELB access

• Decreased deploy time 50+% by updating package install logic (ruby) and reduced AWS cost (120K -> 65K) Brown University Providence, RI

Department of Computer Science - Undergraduate Head Teaching Assistant Jan 2014 – May 2015

• Developed course materials, held weekly TA sections, and mentored on coding for 150+ students

• Courses: Digital World (fall’14: HTA), Scientific Computing and Problem Solving (sp’14: TA, sp’15: HTA) TECHNICAL TOOLS & PROJECTS

Languages: Daily experience: Python Experienced: Java Used in the past: Bash, Angular, Ractive, Ruby Tools: AWS (ECS, CloudFormation, IAM, CodePipeline, Codebuild, EC2, S3, VPC, Cloudwatch, Lambda), Linux, GIT EDUCATION

Brown University Providence, RI

Bachelors of Arts in Computer Science Class of 2015

• Awards: BSA Spark Venture Competition (1st), Henry Parker Manning Prize, Hartshorn-Hypatia Prize (1st) LEADERSHIP EXPERIENCE

Brown Club of Boston Boston, MA

Vice President, Head of Member Engagement Feb 2019 – present

• Held monthly board meetings, organized Brown alumni events, and researched member engagements with 22K+ budget

Brown Student and Community Radio (BSR) Providence, RI Station Manager, Financial Signatory Jan 2012 – May 2015

• Oversaw the station’s ecosystem and managed finances including the annual budget proposal ($10,000+/yr)

• Hosted the Korean indie music show for 2 years

Contact this candidate