Sean Chitwood

While contracted to the DPSA team, I was responsible for improving the build and deployment pipelines for the DPSA team. This included:

• Reduced CI Pipeline run time by 10% through improved build, release, and deployment pipelines.
• Reduced build time 10% and improved maintainability by refactoring a CDK Monolithic Deployment package (TypeScript) to smaller components.
• Designed and used an agentic workflow to implement a TypeScript monitoring package for both AWS Cloudwatch and Grafana Cloud to allow migration to a company standard solution.
• Finalized and tested migration from custom Gitlab jobs to company standard Gitlab Components, enhancing consistency and efficiency.

As Lead Developer for the Relevance team, I was responsible for managing project priorities, deadlines and deliverables:

• I designed, wrote and reviewed code for a Java based search service supporting 400 QPS, integrated with ElasticSearch and a third-party AI service.
• I designed and developed the Kubernetes, Helm and ArgoCD developer platform and deployment infrastructure for the Relevance team. Including the RBAC security policies.
• I developed improvements to the overall Groupon cloud platform including proof of concept for integrating with ArgoCD and Argo Rollouts to realize the benefits of the GitOps reconciliation loop.
• Drove down compute costs 5% by updating our build process to create multi-architecture Docker images and migrate ARM64 instances.
• Controlled costs and reduced Mean time to Mitigate to under 1 hour by integrating Prometheus and Grafana with Kubernetes, KEDA and Horizontal Pod Autoscalers, to scale up and down based on load.
• Drove cloud migration by leading the initial design, data pipeline and support tools in an effort to migrate Relevance from a fixed number of clusters on premesis to a scalable, self healing and fault tolerant installation on a Kubernetes platform in AWS. This involved writing Python scripts and tools for automation.
• On the Relevance Algorithms team, I was responsible for updating and stabilizing the build and on prem deployment systems, allowing the team to move from a monthly release cycle to a weekly cycle, capable of accelerating to a daily basis.

As an SDET on the MSN.com Rendering Platform team, I was responsible for testing the MSN.com rendering platform services, which included:

• Implemented a new testing framework for the MSN.com rendering platform services, allowing for more efficient and effective testing of cache invalidation and dynamic image resizing.
• Developed and executed performance and scalability tests for the MSN.com rendering platform services, identifying bottlenecks and areas for improvement.
• Collaborated with cross-functional teams to ensure that the MSN.com rendering platform services met performance and scalability requirements.
• Worked closely with the Mobile MSN.com live-site team to show them the impact their code was having on shared resources, helping them meet their own performance commitments.
• Wrote a data ingestion tool to process 400 MB/hour web server log files into a SQL data warehouse for analysis of traffic patterns.

As an SDET on the Bing Maps team, I was responsible for testing the Imagery Delivery service, which included:

• Implemented multi-threaded testing capabilities in functional and performance testing frameworks.
• Personally gave the final go/no-go sign-off for Imagery Delivery during the Bing Maps initial release.
• Ran performance tests of maps.live.com/maps.bing.com for image delivery, and query parsing and logging/aggregation of transactions from partner sites.

As a SDET on the Systems Management Server (SCCM) team, my responsibilities included:

• Functional software testing owning up to 5 legacy components of Systems Management Server (SCCM)
• Testing a Windows Mobile version of the client software
• Developed testing tools and automation to emulate a webserver allowing for non-compliant HTTP responses on Windows Mobile Devices
• Evaluated and contributed to developer and functional specs for one major release and several service pack releases

As a Software Test Engineer for the Windows XP Release my responsibilities included:

• TCP/IP Network stack testing for Windows XP Client
• Writing and maintaining testing tools in C.
• Aiding in test plan development and reporting.