
Sr. Software Engineer at Google
San Francisco Bay Area

Sr. Software Engineer at Google
San Francisco Bay Area
Since 2006 I work on search quality in Google.
As a PhD student (2002-2006) I have obtained new theoretical results (computational complexity bounds and approximation hardness ) and practical results (efficient distributed algorithms) for query answering in distributed heterogenous databases ("P2P databases") and inconsistent databases ("inconsistent query answering").
Theoretical results include upper and lower complexity bounds for 'repairing' a database which does not satisfy a set of consistency rules (which includes traditional consistent constraints popular in database worlds and extended forms of them) and for query answering over database which is inconsistent (query processing is not necessary involves fixing whole database). I found approximation algorithm which provide 'good enough' solution in case when no computational feasible algorithm exist.
I developed a system which repair a database and performs and efficient query processing over inconsistent database
The other system I developed is a "P2P Database", a software which may integrate databases with different schema (assuming schema mappings are provided). The software was able to work with cycles in database dependencies (with fix-point semantics) and was efficient with respect to the minimization of the number of networks messages to process a query
Publications in prestigious international conferences and journals including ICDT, VLDB, ICDE, DBPL, Journal of Information Systems.
(distributed) query processing in databases, informational retrieval, web and text mining
(Public Company; GOOG; Internet industry)
September 2006 — Present (2 years 11 months)
Search Quality
(Research industry)
July 2002 — September 2006 (4 years 3 months)
Did research on data integration and inconsistent databases (see summary for 2002-2006)
Was TA for a class on databases
Participated in several Semantic Web Projects
(Educational Institution; Higher Education industry)
July 2003 — August 2003 (2 months)
(Educational Institution; 1001-5000 employees; Research industry)
July 2001 — April 2002 (10 months)
Development of the university information system.
Development of the data integration solution to consolidate data from Austrian universities
(Privately Held; 11-50 employees; Information Technology and Services industry)
May 1995 — December 1997 (2 years 8 months)
PhD , Computer Science , 2002 — 2006
PhD thesis on "Logic-Bases Data Integration"
Proved complexity results for query answering over inconsistent databases. Developed and implemented new efficient algorithms for query answering over inconsistent databases. Developed new techniques for efficient approximate query answering in case if exact query answering is computationally intractable (Reported at ICDT, IEEE ICDE, DBPL, Information Systems)
Developed new semantics and proved complexity results for query answering in P2P database systems. Developed and implemented efficient algorithms for query answering and database update in GLAV P2P database systes (reported in VLDB, VLDB workshops)
MSc , Applied Mathematics and Informational Technologies , 1991 — 1997
MSc , Physics , 1991 — 1994
swimming, trekking, history, sci-fi, economics,
ACM SIGIR, ACM SIGMOD
2005. "Quantum Information Visiting Fellowship" to visit Quantum Information Science group, the University of Queensland, Australia. September 2005, duration: 5 weeks.
2005. The WUN (Worldwide University Network) grant to visit UCSD, San Diego, California, USA (Prof. Victor Vianu), 2075 GB pounds. Expected time is Jan 2006, duration: 4 weeks (did not visit due to clash with local duties).
2003. The WUN (Worldwide University Network) grant to visit Univ. of Washington, Seattle, Washington, USA (Prof. Alon Halevy). 2000 GB pounds. July 2003, duration: 4 weeks.
2002. Scholarship of the University of Manchester, Computer Science Departments. Fees: 9500 GB pounds per years, scholarship: 7800 GB pounds per year, total 17300 GB pounds per years.