[8] They specialized in hacking and hardening Kubernetes containers, working as an independent penetration tester before joining Heroku as a lead platform security engineer.

[10][11] As of April 2, 2024, they work as a Senior Principal Security Architect at Docker, Inc.

[17][18] In 2020, they received the Top Ambassador award from the Cloud Native Computing Foundation for spreading interest in the area.

[19] In 2020, Coldwater and Brad Geesaman presented a talk at RSA 2020 titled "Advanced Persistence Threats – The Future of Kubernetes Attacks",[20] in which they demonstrated bypassing Kubernetes audit logs and other attacks.

[19] In 2021, Coldwater, with expertise from Chad Rikansrud, became the first person in history to escape a container on a mainframe.