# Oliver Z.

> Software Engineer II @ Circle

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

Hi! I am a Software Engineer @ Circle integrating critical fiat operations with our banking partners. Previously, I developed platform infrastructure, and owned several libraries that enabled smooth business operations.

## Work Experience
### Software Engineer II @ Circle
Jan 2024 – Present | New York, NY
Banking Infrastructure, Platform Infrastructure

◦ Led banking integrations with global fiat institutions supporting infrastructure responsible for $35B+ in monthly USDC transaction volume, primary responsibilities included collaborating with external banking partners to integrate APIs, diagnose outages, and resolve abnormal transaction states.
◦ Extended and maintained the transaction processing system handling fiat payment flows for USDC issuance and redemption, including payouts, push payments, settlement reconciliation, and returns across 5+ global payment rails.
◦ Integrated LaunchDarkly to design and implement a feature flag platform, including a sahred Java library, Terraform-based flag configuration, and GitHub Actions pipelines enabling automated management of 600+ feature flags across 28 production services with adoption continuing to grow.
◦ Led organization-wide migration from AWS Java SDK v1 to v2, building backwards-compatible platform modules for common AWS services such as SNS, SQS, and S3 to standardize infrastructure dependencies across backend services.
◦ Participated in on-call rotation for banking infrastructure supporting 10+ bank integrations, diagnosing and resolving production incidents including bank API outages, reconciliation mismatches, and stuck transaction lifecycles using Datadog monitoring and operational tooling.

### Software Engineer I @ Circle
Jan 2022 – Jan 2024 | New York City Metropolitan Area
Platform Infrastructure

◦ Built and maintained a Protobuf-based configuration service managing 1000+ blockchain configuration parameters across stablecoin services.
◦ Optimized configuration refresh and retrieval latency by up to 85%, significantly reducing propagation time for new blockchain parameters across stablecoin services.
◦ Maintained core platform libraries and shared infrastructure components used across backend services, managing dependency releases and compatibility across multiple production systems.
◦ Implemented observability using Datadog metrics and dashboards, supporting production reliability and incident response.

### Back-End Software Engineer Intern @ American Express
Jan 2021 – Jan 2021 | Phoenix, Arizona, United States
- Designed and developed RESTful APIs using Vert.X and Java that expanded the functionalities of the internal Chaos Engineering platform's administration portal.
- Identified shortcomings in existing micro services and implemented improvements to follow best practices for RESTful APIs.
- Supported the admin portal's development and maintainability by implementing standalone client classes that manage interactions with external micro services following the factory design pattern. 
- Introduced and Implemented API request validations using javax annotations to expand validation coverage and provide informative responses to clients consuming the APIs.

### Full Stack Software Engineering Intern @ UKG (Ultimate Kronos Group)
Jan 2020 – Jan 2020 | Atlanta, Georgia, United States
- Supported product translations involving over 14 languages using C# and Javascript to support expansion into international markets and ensure regulatory compliance.
- Debugged defects in the complex codebase using VS debugger and Chrome Dev Tools to support user experience objectives.
- Developed automated tests using Selenium C# Web driver to prevent future changes from causing unexpected software errors. 
- Identified and reported software defects using JIRA in an Agile/Kanban environment to ensure issues are known and can be prioritized.

### Software Development Engineer (SDE) Intern @ Amazon
Jan 2020 – Jan 2020 | Boston, Massachusetts, United States
-	Developed a flexible and scalable CLI for collecting contextual utterances in S3 using Apache Spark and Python to improve Alexa's user interaction capabilities. 
-	Created a low-level design on the architecture, algorithm, and frameworks of the developed CLI to provide detailed documentation for internal teams. 
-	 Wrote python unit tests using the unittest module to achieve 84% code coverage. 
-	Wrote user stories for each sprint to track and ensure project deliverables.

### Full Stack Software Engineering Intern @ NCR Corporation
Jan 2019 – Jan 2019 | Atlanta, GA
-    Collaboratively developed a scalable and automated Proxy Analytics Web Application capable of collecting and aggregating metrics from any number of proxies using C# and JavaScript. 
-    Contributed to the redesign of the Developer Experience Portal’s Homepage by developing a carousel using Typescript, Sass, and HTML.
-    Worked in an Agile Software Development Environment to develop features that improved the functionality and user experience of Developer Experience Portal.
-    Facilitated a two-week Sprint as the Scrum Master by reviewing daily progress in stand-ups.


## Education
### Master of Science in Computer Science | Interactive Intelligence
Georgia Institute of Technology

### Bachelor of Science in Computer Science | Intelligence and Media
Georgia Institute of Technology


## Contact & Social
- LinkedIn: https://linkedin.com/in/zhengqy421

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Source: https://flows.cv/oliverz
JSON Resume: https://flows.cv/oliverz/resume.json
Last updated: 2026-03-29