During May 2026, this developer delivered a Sandbox Firewall feature for the e2b-dev/infra repository, enabling internal CIDR whitelisting to streamline network management and security. By allowing configuration of approved internal IP addresses to bypass the default deny list, the solution reduced manual firewall rule maintenance and improved operational efficiency. The work involved designing network security policies and implementing per-IP allow overrides in the orchestrator, all while maintaining disciplined git practices with traceable, descriptive commits. Utilizing Go and Terraform, the developer demonstrated expertise in infrastructure as code and network security, focusing on scalable, policy-driven internal traffic management within sandbox environments.