Janus Chung

Platform Engineer | Cloud Engineer | SRE

Work Experience

Flagler Health

Senior Software Engineer

Platform / Cloud Infrastructure

Apr 2025 - Present

New York, NY

  • Own the cloud platform for a ~30-engineer healthcare product organization, setting infrastructure, Kubernetes, networking, observability, and delivery standards across AWS and GCP in a HIPAA-regulated environment.
  • Established GitOps with Argo CD and a Build Once, Promote Forward release path in Kargo, taking production releases from bi-weekly to daily and cutting CI build time by ~70%.
  • Architected a multi-cloud Kubernetes platform on GKE and EKS with Terraform, Helm, and GitOps, and led workload migration off legacy EKS — standardizing on Gateway API (Envoy Gateway) with per-cluster DNS/TLS automation so services could run side by side and cut over or roll back with a DNS change.
  • Moved workload identity from IRSA to EKS Pod Identity so IAM roles are no longer tied to a cluster OIDC issuer and services survive cluster replacement.
  • Designed private cross-cloud access with Tailscale for services and engineers, removing public exposure of internal tools and the load balancers they required.
  • Built multi-cluster observability with Prometheus, Grafana, Loki, and Alloy, and an LLM service that writes incident reports from Loki logs.
  • Cut non-production compute cost with spot capacity, and kept staging and production on dedicated nodes.
  • Built Slack ChatOps for infrastructure and version lookups, partner with application engineers on design and incidents, and document and teach deployment and observability practice.
Terraform Kubernetes EKS GKE AWS GCP GitOps Helm Argo CD Kargo CI/CD Pod Identity Gateway API Envoy Gateway Tailscale Prometheus Grafana Loki Alloy LLM

AD HOC LLC

Senior Software Engineer DevOps

Feb 2023 - Mar 2025

Washington, DC

  • Led platform direction for Department of Veterans Affairs API teams on AWS, defining GitOps-centric delivery with Argo CD, CI/CD patterns in GitHub Actions, DataDog observability conventions, and HashiCorp Vault integration so teams shipped through a consistent, auditable path.
  • Owned Terraform-based Infrastructure as Code for shared AWS foundations—repeatable provisioning, clearer operational ownership, and less bespoke infra per tenant as adoption scaled.
  • Set progressive delivery standards using Argo Rollouts and blue-green strategies, tightening release safety and limiting blast radius across environments.
  • Architected a standardized EKS platform service to onboard VA API workloads—opinionated cluster patterns, guardrails, and a paved path that accelerated multi-team onboarding to AWS.
  • Published golden-path reference applications (Java, Python, Ruby) and Helm baselines so tenants could adopt the platform quickly without re-solving integration, packaging, and deployment shape.
  • Built and steered Code VA, an internal software catalog improving discovery and reuse of services across the Department of Veterans Affairs.
  • Extended the platform data plane by guiding migrations of cache and database tiers to ElastiCache and RDS via Kubernetes CRDs, exposing managed data as a consistent platform capability.
  • Redefined quality gates by moving integration tests from standalone GitHub Actions jobs into Argo Rollouts pre- and post-analysis templates, coupling validation directly to promotion and release flow.
Terraform GitOps Argo CD Argo Rollouts EKS AWS Kubernetes Helm CI/CD GitHub Actions DataDog Vault ElastiCache RDS

Integral Ad Science (IAS)

Staff Software Engineer

Jun 2020 - Dec 2022

New York, NY

  • Built multiple microservices to migrate legacy monolith applications over to Kubernetes in AWS EKS which made feature updates faster and improved developer experience.
  • Designed and developed APIs for IAS pre-bid and post-bid platform using Spring Boot with a MySQL backend running in Tomcat. This project enabled IAS' clients to integrate with our targeting segments quickly.
  • Created a new microservice in AWS via ECS/Fargate. It was called Reporting API and it allowed clients to request reports programmatically.
  • Worked on integrating systems developed by the acquired company (Admantx). We had to receive their data and incorporate it as part of our pre-pid feature set.
  • Created multiple mock services with Spring Boot and Cucumber framework to improve development in non-production environment and enhance automated tests.
  • Mentored and helped new engineers integrate in IAS as part of the co-pilot program.
  • Created automated test-suites in Python for regression and acceptance tests.
  • Dockerized an existing monolith Spring application to improve developer experience. This project won in the company hackathon.
  • Conducted bi-weekly Lunch and Learn sessions for the team to present and discuss new technologies, and brainstorm improvement for our current tech stack.
Kubernetes EKS AWS Spring Boot MySQL ECS Fargate Docker Python Cucumber

Staff QAA Engineer

Jun 2015 - May 2020

  • Created headless XVFB and Chrome/Firefox test framework to speed up testing time by 80%.
  • Created a reusable testing environment for different products using Puppet that spins up AWS EC2 environments on demand.
  • Refactored legacy regression suite and cut testing time from 90 to 25 minutes.
Puppet AWS EC2 Selenium Test Automation

IV Interactive

Full Stack Software Engineer

Aug 2014 - Jun 2015

Jersey City, NJ

  • Designed and created a HIPAA compliant Web Application for IV Interactive using Laravel (PHP framework), MySQL, jQuery, Bootstrap, Skeleton, SASS/CSS3 and HTML5.
  • Created and maintained unit tests for the above using PHPUnit.
  • Proposed and implemented secure backups of codebase and database with PGP data encryption.
Laravel PHP MySQL jQuery Bootstrap PHPUnit

Media Three Corporation

Full Stack Software Engineer

Jun 2013 - Aug 2014

New York, NY

  • Implemented customer support system using CakePHP (PHP framework), MySQL, jQuery, CSS3. This was used to monitor customer complaints and inquiries.
CakePHP PHP MySQL jQuery

L & L Travel Enterprise, Inc

Senior Software Engineer DevOps

Aug 2012 - Jun 2013

New York, NY

  • Created and maintained the Online booking/tracking system for 500 travel agents using IIS, ASP, Javascript and SQL Server.
IIS ASP JavaScript SQL Server

Merck & Co., Inc

Informatica Developer (Consultant)

Jun 2011 - Feb 2012

Morristown, NJ

  • Worked on adding features and upgraded Informatica from version 4.2 to 5.3
Informatica ETL

DataSynapse, Inc

Senior Support Engineer

May 2007 - Nov 2009

New York, NY

  • Provided technical support for customers using DataSynapse software, a distributed computing application, on their mission-critical production systems in various platforms.
  • Developed sample code/examples of the DataSynapse API to make integrations for clients easier.
Distributed Computing API Technical Support

Applimation, Inc

Informia Support Consultant

May 2005 - Apr 2007

New York, NY

  • Provided technical support for customers using Applimation software.
  • Developed custom Oracle/PeopleSoft/Siebel SQL metadata for customers.
Oracle PeopleSoft Siebel SQL