About

Work Experience

• Senior Software Engineer, Cash App (Block)

  Aug, 2022 - Present

  Backend engineer on Cash App Lending

  • Lead Lending engineer for Cash's first BNPL implementation with AfterPay.

  • Implemented an extensible finite state machine for 'loan offers' which now supports many different products.

  • Dramatically (~4x) improved bulk payment processing speed to bring us into compliance.

  • Guided implementation of batch SQS consumption in Misk, Cash's web framework.

  • Implemented Misk support for Bucket4j rate-limiting, increasing service reliability across Cash.

  • Drove eng-wide effort to decommission Cash's brittle, shared, single-point-of-failure rate-limiting service.

  • Implemented a double entry ledger system to simplify quarterly accounting reports.

  • Improved Lending's build times (~3x) by implementing test sharding, removing unneeded web framework rebuilds, and removing unneeded background task execution.

  • Migrated Lending from Splunk to DataDog

• Staff Platform Engineer, Hyperscience

  Apr, 2022 - Aug, 20224 months

  Building Hyperscience's SaaS offering

  • Implemented scalable, customizable deployments for many customers via Helm, cdk8s and ArgoCD

  • Implemented Kubernetes and AWS 'show-back' cost attribution via Kubecost

  • Upgraded our Hashicorp Vault implementation to use k8s service accounts for access rather than static secrets

• Staff Platform Engineer, Zip Co

  Sep, 2019 - Apr, 20222 years 7 months

  Lead engineer for CD pipelines, Azure infrastructure, Kubernetes compute platform, and Istio service mesh.

  • Wrote a custom Envoy filter to extract JWT claims into HTTP headers for use with Istio's rate-limiting middleware

  • Chose DataDog as our observability partner, and integrated it with our microservices, Istio, Kubernetes, and Azure.

  • Provided self-serve declarative monitoring capabilities for our developers.

  • Aggressively targeted build time reduction via docker image caching and auto-scaling self-hosted runner queues.

  • Introduced Terraform, and built a CI/CD workflow for Terraform development

  • Used Terraform to build a module which deployed all resources needed for a Zip stack, and used this module to deploy Zip stacks to several international regions

  • Implemented Canary releases via Istio, Flagger, and DataDog

  • Migrated our networking stack from NGINX + Containerd to Istio

  • Fixed two severe bugs in EventStoreDB

  • Found a subtle bug between OpenSSL and Azure Front Door

• Cloud Engineer, Devon Energy

  Jan, 2017 - Sep, 20192 years 8 months

  Automated the deployment and configuration of virtual machines and Microsoft Azure infrastructure via IaC tools, and assisted in the cloud migration of critical workloads.

  • Implemented a rudimentary data exfiltration detection pipeline via DataBricks and our Elastic Cloud Enterprise stack

  • Implemented an enterprise logging architecture via Elastic Cloud Enterprise, and CD for logstash pipelines

  • Replaced hand-rolled VM provisioning with RedHat CloudForms and Puppet

  • Implemented Puppet manifests for Elastic, PostgreSQL, and base SAP install

Skills

Education