Aug 2015 – Dec 2017 · 2 yrs 4 mos

• Successfully led building cost-effective ad serving infrastructure for high load (up to 300K qps per server).
• Successfully led backend language transition from PHP+node.js to Go. This significantly reduced development, maintenance and operational costs.
• Helped building fast and powerful ad analytics on top of ClickHouse.
• Helped improving monitoring and logging infrastructure on top of Prometheus, ClickHouse and Grafana.

Sep 2014 – Jun 2015 · 9 mos

• Proposed and implemented new revenue sharing scheme with guaranteed gross profit margin (previous schema sometimes could lead to negative gross profit).
• Reduced hosting costs per request by an order of magnitude.
• Improved backend software stability from multiple crashes per hour to zero crashes/freezes and zero memory leaks per month.
• Significantly optimized stats'​ processing speed.
• Added detailed click stats, so every click could be filtered or grouped by a dozen of attributes on the fly.
• Added missing ad serving features (filters, limits, smart requests' throttling).
• Added detailed event logging and real-time backend state observability.

Nov 2012 – Aug 2014 · 1 yr 9 mos · Kiev

Oct 2010 – Oct 2012 · 2 yrs

Jun 2006 – Oct 2010 · 4 yrs 4 mos

Aug 2005 – Oct 2005 · 2 mos

Sep 2003 – Feb 2005 · 1 yr 5 mos

Jan 2001 – Sep 2002 · 1 yr 8 mos