Open to opportunities

Jon Cox

@joncox

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Experienced software engineer and Unix/Linux specialist focused on secure, high-performance systems.

United States

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What I'm looking for

I seek senior engineering roles focused on secure, high-performance systems, cross-platform migrations, automation, and mentorship in collaborative, security-conscious teams.

I am a Software Engineer and Unix/Linux specialist with 14+ years of experience in DevOps, security, automation, and cross-platform development. I have a proven record of system hardening, performance optimization, and security mitigation across enterprise environments, and I hold a Public Trust Security Clearance.

I build and migrate systems using languages such as C, Rust, Go, Python, Java, and scripting languages while automating infrastructure with Ansible, Chef, Puppet, Docker, and Kubernetes. My accomplishments include leading performance improvements that cut runtimes 50%, migrating legacy applications across platforms, authoring tooling for outage resilience, and frequently publishing technical security research.

Experience

Work history, roles, and key accomplishments

Software Engineer

Internal Revenue Service

Jan 2024 - Jan 2025 (1 year)

Troubleshot Python, Java, and ksh scripts on Solaris, supported migrations of Python applications across Solaris versions to improve stability and deployment success, and proposed Solaris-based testing to enhance security and development speed.

Python Java KSH Debugging Shell Scripting

Software Engineer

KaZee

Jan 2022 - Jan 2023 (1 year)

Migrated legacy C applications from AIX to RHEL, designed a cross-platform DevOps system in Go, automated onboarding with Ansible, and performed security hardening and performance tuning on Debian and RHEL servers.

C#Go Ansible RHEL MariaDB Oracle System Hardening Debugging

Software Engineer

Citibank

Jan 2021 - Jan 2022 (1 year)

Investigated and resolved Chef, RedHat, and VMware automation errors, served as lead Python developer optimizing code to reduce runtimes by 50% and nightly job failures, and built automation to improve monitoring and incident response.

Python Chef RedHat VMWare BASH Automation Performance Optimization Mentoring

Linux Systems Administrator

Rackspace Hosting

Jan 2013 - Jan 2020 (7 years)

Managed hosting reliability across hybrid, dedicated, and cloud environments, tuned Apache/Nginx/PHP-FPM/MySQL stacks for performance, mitigated security incidents, and automated admin workflows with Ansible to reduce troubleshooting time.