Rewrite of legacy monitoring solution built on multiple cacti, zabix, icinga intances into a cluster of prometheus and grafana servers with pagerduty handling escalations
Rewrite of legacy Puppet server provisioning using SaltStack
Monitoring, management, backup and security of Delivery Hero Holding food platform servers
Emergency reaction on-call
Configuring linux machines for designated roles and securing access. Writing chef recipes and munin/nagios plugins. Automatizing day to day sysadmin tasks. Creating systems' documentation especially troubleshoot / debug sections. Designing redundant service setups - ip failover, vrrp, clustering, mirroring, master/slave replication. Multi-level backup schemes
Development of small and medium sized C# applications (desktop and server-client architecture). Among others - a Taxi Fleet system
Developing web application and web services using python/django/twisted and PHP/Cake frameworks. CMSes, online shop implementations, auction system and others
Linux server administration of Debian, Ubuntu, CentOS. Firewall configuration (iptables, Vyatta). Security hardenning, scripting in bash and python