Kai-han "Kelly" Chang's Resume

Kai-han "Kelly" Chang

Brooklyn, New York

About

Backend-focused Software Engineer with strong infrastructure knowledge and platform engineering skills. Comfortable working across different aspects of backend engineering and bridging any gaps between engineer and infra to promote a strong DevOps culture. Active in organizing dev community events and contributing to open source projects as well.

Work Experience

Flow

2025 - Present

Senior Software Engineer

Senior Software Engineer that focused on applicant and resident experience.
  • Designed and implemented critical third-party integrations to synchronize leasing data with internal systems, improving data consistency and reliability across platforms.
  • Delivered and refactored a leasing lifecycle event-driven system, resulting in more structured codebase, improved maintainability, and clearer, more traceable audit trails.
  • Established and promoted event-driven architecture guidelines across the team, advocating for best practices and driving more consistent system design
  • Architected internal tooling to support seamless transfer of leases from external systems, enabling a safer onboarding process and a more intuitive user experience.
  • NYC
  • Hybrid

Justworks

2024 - 2025

Senior Software Engineer

Senior Software Engineer on Platform team that developed and maintained internal tooling such as authorization API and DevEx improvement libraries.
  • Built and maintained centralized authorization APIs for other internal services to use, consolidating access management for different products.
  • Simplified identity policy management by streamlining the review process and refactoring a legacy Terraform repo handling internal team authentication and scopes.
  • Migrated a Ruby on Rails monolith codebase from legacy deploy scripts to modernized toolings such as Docker and AWS EKS, shortened CI/CD lead time and improved maintainability and scalability.
  • NYC
  • Hybrid

Petal Card

2024 - 2020

Senior Software Engineer

Joined as a backend engineer on Registration Decision Team and later transitioned to Platform team as Senior Software Engineer, built and maintained internal tools and CI/CD pipeline.
  • Developed and maintained a decision flow engine that supported flexible evaluation logic.
  • Created an event-driven architecture framework using AWS Lambda and SQS to refactor legacy long-runnig synchronous jobs by building internal libraries, Terraform modules, code templates and documentation, which helped with jobs scalability and decreased error rate.
  • Co-led the migration project of the company-wide CI/CD pipeline from Jenkins to Azure DevOps, shortening 35% CI and deployment lead time.
  • Founded an internal Python standards working group to set up company-wide Python coding style guidelines and maintained internal libraries for the engineering team.
  • Hybrid
  • NYC

Looking Glass Factory

2020 - 2018

Software Engineer

  • Developed and maintained scalable backend API services for authentication, used in company wide applications including websites, SDKs and multiple official Unity applications.
  • Introduced DevOps culture into the company by setting up CI/CD processes, linters, and documentations.
  • NYC

Education

New York University

2016 - 2018
Masters's Degree in Integrated Design and Media

National Taiwan University

2011 - 2015
Bachelor's Degree in Information Systems and Management

Skills

  • Python
  • Typescript
  • Node.js
  • Go
  • Kotlin
  • AWS Certified Solutions Architect (SAA-C03)
  • AWS
  • Kubernetes
  • Docker
  • Helm
  • Terraform
  • CircleCI
  • Github Actions
  • Datadog
  • Vim