# System Administration > Selected work demonstrating this service. - [Administered 40 websites on Ubuntu Linux hosting servers with Apache and Nginx, ensuring high availability and performance.](https://software.engineer.company/portfolio/administered-40-websites-on-ubuntu-linux-hosting-servers-53/) - [Planned and implemented new infrastructure functionality for internal and external systems, building solutions durable enough to still run years later with minimal change.](https://software.engineer.company/portfolio/planned-and-implemented-new-infrastructure-functionality-for-internal-85/) - [As one of the first hires, designed and built the entire core infrastructure and supporting processes from scratch for a green‑energy SaaS startup, laying the foundation for rapid growth.](https://software.engineer.company/portfolio/as-one-of-the-first-hires-designed-and-86/) - [Ran the whole company on one 512 MB single‑core host — a git forge, a web server serving seven domains, Tor, two alternate‑protocol servers, backups and intrusion banning — by treating 464 MB of usable memory as the binding architectural constraint.](https://software.engineer.company/portfolio/ran-the-whole-company-on-one-512mb-host-109/) - [Deployed the company's own git forge on Soft Serve, private by default with no web panel and its SSH port bound to loopback behind a jump host, and made the landing page in front of it a build artefact of the main site rather than a hand‑kept copy.](https://software.engineer.company/portfolio/deployed-the-companys-own-git-forge-121/)