Sassan Torabkheslat Email & Phone Number

Berlin, Germany

Berlin, Berlin, Germany

🚀 Implemented critical enhancements for infrastructure-side applications, ensuring failover and high availability.🔧 Successfully resolved a longstanding issue that had been affecting operations.💻 Implemented improvements for enhanced stability in database connections.🔒 Strengthened infrastructure security measures, contributing to increased efficiency.

Tehran Province, Iran

• Enhance monitoring system (Zabbix) to accept 4K new value per second, 48K nodes, and 3.2M items• Support and troubleshoot TD-LTE services handover by Ericsson to Company to support more than 50K customers• Help other technical teams to fix complicated technical issues such as TCP/IP, Routing issues• Set up Proxy Server for apple devices and PlayStation consoles, that improve 2x or 3x user experiences and decrease 70% of network congestions.• Held day-to-day meetings with other technical teams and customer-care teams to find bottlenecks, and root causes of problems and see how they can get improved in all situations• Refactor or improve most of the applications (especially internally developed) based on company needs for the next 5 years• Build infrastructure solutions to ensure DNS servers can handle more than 120K req/sec with the highest possible uptime• Configure the OSS/BSS Application by Docker Swarm in collaboration with the software development team for the internal use of the company or about 250 active users

Tehran, Tehran Province, Iran

• Installing an integrated Umbrella monitoring system with Zabbix, Grafana, and many scripts (python, bash) to collect any statistical data, with 2300 nvps, 800 nodes, and 400K items.• Manage about 900 VMs and 100 physical servers and about 50 Technical Staff with FreeIPA to control access permissions.• Deployed an Open DNS server to accept more than 80K queries per second with RedHat Enterprise Linux (CentOS)• Write a few applications (with C++) and scripts to collect data from 50K subscriber • Build Redhat Virtualization Platform (Ovirt) with 25 physical servers for hundreds of VMs• Develop a service with gSoap to fetch statistical data with more than 10K CPEs.• Create a Backup system to download the latest config of all Network devices (Cisco, Mikrotik, Ericsson EBand , Ericsson eNodeBs) which is about 500 devices two times a day.

Tehran, Tehran Province, Iran

• Set up CICD mechanisms with Git/Gitlab to do 10 updates per second• Managed a cross-functional team of about 30 frontend and backend developers • Installation, maintenance, and administration of over 800 virtual machines and 20 physical servers installed at multiple datacenters• Design and Tune a Mysql Database with about 3TB data to respond to 1.2M queries per secondMonitor about 20 virtual machines with Zabbix• Tune OS (Performance Tuning) and JVM tuning (Java Runtime Environment Tuning) to handle about 12K established connections with 22K concurrent connections with HaProxy to increase HA (High Availability) to serve requests of the main portal of the Rightel company on JBoss• Migrate over 2TB data of Oracle database to Mysql• Run multiple liferay servers with tomcat and haproxy to handle requests sent by 4M subscribers

Isfahan

LPIC-1 and LEC Trainer

Tehran

• Maintain and Support Systems and services (24*7)• Setup Monitoring Systems like Zabbix/Zenoss to monitor and provision server/service needs• Setup and install Solaris/Linux (Sparc/x86_64)• Kernel Customization to enable/disable needed features (such as OCFS2 on CentOS 6.4)• Apache/JBoss/Tomcat/Mysql performance tuning for high-load services• Setup Varnish (HTTP accelerator) in front of clustered web servers to decrease visitors pressure on the web servers (about 80% hit ratio)• Solved technical problems in high-pressure situations as the primary escalation point for high-priority, complex issues, and outage recovery• Implemented security policies, and monitored unusual traffic patterns, bandwidths, and vulnerabilities.• Created Automated Provisioning and update processes using integrated OS Tools• Installing, Configuring, Managing, and Monitoring different kinds of servers and services (DNS, MAIL, WEB, FIREWALL, LXC, etc.)• Installed Servers for Web Development and Database applications using Apache/Mysql• Configure Linux servers to access SAN and NFS• Experienced in system Security using ACL and RBAC• Mysql/MariaDB Clustering (Mult Master Replication)• Setup Mail Services (Postfix, Dovecot) and troubleshoot serious problems (100 msg/sec)• Designed and implemented High Availability (HA) clusters using shared file systems, HaProxy, and Pacemaker.• Setup JEE Clustered Services based on JBoss Application Server and Tomcat• Experience in Security Hardening in UNIX, Linux• Setup Cluster File Systems for shared storage on SAN (ocfs2, gfs2)• Setup Portal Search Engine Based on Apache Solr• Exposure to Performance using Load Runner JMeter, ab on Mail, REST and SOAP WebService, HTTP Web, Database• Kernel optimizations for high load services (12K L7 concurrent request, 22K L7 req/sec, 524K connection track)• Setup Firewall based on Linux (Debian wheezy) and BSD (Pfsense) to protect and load balance traffics (using Haproxy ) between back-end servers

Isfahan-Iran

Service MaintenanceLAMP StackSystem DocumentationAutomation (Scripting)Monitoring System