Ernesto S.

I teach Operating Systems at the largest university in Argentina, the Universidad Tecnológica Nacional, since 2009. I am a Linux expert, I've given several courses including LPIC. I have deep knowledge of networking and Internet, e.g.: VPN, ACLs, routing, NAT, firewalling, port forwarding, sockets, DNS, Apache, load balancing, proxies, transparent and reverse proxies, WAN technologies, and so. I also have experience in VoIP, SIP, Asterisk, gateways (from Digium cards to usb dongles), and databases (mostly Postgres and MariaDB). I'm Linux server admin since 2003 for several online web sites with applications like email, IoT, Moodle, APIs for mobile apps, among others, several dockerized. I have very good knowledge of bash scripting. I can help you with AWS or any other provider (including standalone server) performance tuning, bottleneck detection and general troubleshooting, as long as it is Linux based. I can also assess you about the price/performance rate of the services available. I also am a software developer, mainly backend Ruby on Rails, but I also have good knowledge of C, and understanding of Perl and Python. Further I did embedded projects with arduino and IoT (ESP8266 and ESP32), including development of Smart Home appliances, including MQTT and SSL connections for this devices. My work experience includes integration of embedded devices like ESP8266 into Ruby on Rails projects, through an API, web scraping, students management systems, VoIP protocol sniffing for out-of-band CDR and billing, and development of complex systems using PostgreSQL Stored Procedures, among others. I have several projects to show you if you want to chat. I'm a serious, good and fast engineer, and I will deliver what you ask, but will also be thinking about the problem to be solved, to be sure that what you get is not only what you ask, but also what you need. I'm looking forward to working in your project. Regards, Ernesto.