Alexander Dolnik
Senior Data Scientist / Data Architect at Mellivora Software- Claim this Profile
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English Professional working proficiency
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Russian Native or bilingual proficiency
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French Limited working proficiency
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Hebrew Elementary proficiency
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Bio
Olga Pogozheva
Alexander is an astounding professional - scrupulous, attentive to details, always coming up with the solutions, both technical and business. He approaches the problem from both the inside and outside perspectives, taking into account business side of the technical solution at all times. While working at Mellivora Software as a CTO & Senior Data Architect, Alexander had been tensely involved in ETL and Big Data projects, and his core strength and tech stack involved (not limited to) Pentaho and Hadoop ecosystem, and all of the following: Stream data: Apache Kafka Indexing: ElasticSearch Computational module: Hadoop (Cloudera): Hive, Impala, HBase, Sqoop, Spark ETL and workflows: Oozie, Apache NiFi, Pentaho Kettle Front-End: Ruby-on-rails, Postgresql, Apache Zeppelin, Jupyter Platforms: Amazon AWS, Google Cloud BackEnd: GraphDB (Apache TinkerPop stack: Gremlin, JanusGraph/Titan, ElasticSearch 6.0) Languages: Java, Python, SQL It's been a pleasure working with Alexander, he's a true asset to both ours and the clients' teams. My highest possible recommendation.
David Clarkson
Alex and I worked together on a travel based client project, where the goal was to aggregate multiple sources of data into a single validated set. The project had some customer and hardware driven constraints to work within, mainly around technologies and system resources. The data Inputs and Outputs ranged from MySQL, XML, JSON and Binary files, Couchbase and MongoDB, with limited system resources. In addition to this Alex worked directly with complex internal systems and built integrated ETL steps which extended the use of our own APIs. Alex always looked forward to the challenges and was keen to find solutions. He uses his wide ETL experience to try different solutions for each problem. Alex is a highly skilled ETL developer, and it was a pleasure to work with him.
Olga Pogozheva
Alexander is an astounding professional - scrupulous, attentive to details, always coming up with the solutions, both technical and business. He approaches the problem from both the inside and outside perspectives, taking into account business side of the technical solution at all times. While working at Mellivora Software as a CTO & Senior Data Architect, Alexander had been tensely involved in ETL and Big Data projects, and his core strength and tech stack involved (not limited to) Pentaho and Hadoop ecosystem, and all of the following: Stream data: Apache Kafka Indexing: ElasticSearch Computational module: Hadoop (Cloudera): Hive, Impala, HBase, Sqoop, Spark ETL and workflows: Oozie, Apache NiFi, Pentaho Kettle Front-End: Ruby-on-rails, Postgresql, Apache Zeppelin, Jupyter Platforms: Amazon AWS, Google Cloud BackEnd: GraphDB (Apache TinkerPop stack: Gremlin, JanusGraph/Titan, ElasticSearch 6.0) Languages: Java, Python, SQL It's been a pleasure working with Alexander, he's a true asset to both ours and the clients' teams. My highest possible recommendation.
David Clarkson
Alex and I worked together on a travel based client project, where the goal was to aggregate multiple sources of data into a single validated set. The project had some customer and hardware driven constraints to work within, mainly around technologies and system resources. The data Inputs and Outputs ranged from MySQL, XML, JSON and Binary files, Couchbase and MongoDB, with limited system resources. In addition to this Alex worked directly with complex internal systems and built integrated ETL steps which extended the use of our own APIs. Alex always looked forward to the challenges and was keen to find solutions. He uses his wide ETL experience to try different solutions for each problem. Alex is a highly skilled ETL developer, and it was a pleasure to work with him.
Olga Pogozheva
Alexander is an astounding professional - scrupulous, attentive to details, always coming up with the solutions, both technical and business. He approaches the problem from both the inside and outside perspectives, taking into account business side of the technical solution at all times. While working at Mellivora Software as a CTO & Senior Data Architect, Alexander had been tensely involved in ETL and Big Data projects, and his core strength and tech stack involved (not limited to) Pentaho and Hadoop ecosystem, and all of the following: Stream data: Apache Kafka Indexing: ElasticSearch Computational module: Hadoop (Cloudera): Hive, Impala, HBase, Sqoop, Spark ETL and workflows: Oozie, Apache NiFi, Pentaho Kettle Front-End: Ruby-on-rails, Postgresql, Apache Zeppelin, Jupyter Platforms: Amazon AWS, Google Cloud BackEnd: GraphDB (Apache TinkerPop stack: Gremlin, JanusGraph/Titan, ElasticSearch 6.0) Languages: Java, Python, SQL It's been a pleasure working with Alexander, he's a true asset to both ours and the clients' teams. My highest possible recommendation.
David Clarkson
Alex and I worked together on a travel based client project, where the goal was to aggregate multiple sources of data into a single validated set. The project had some customer and hardware driven constraints to work within, mainly around technologies and system resources. The data Inputs and Outputs ranged from MySQL, XML, JSON and Binary files, Couchbase and MongoDB, with limited system resources. In addition to this Alex worked directly with complex internal systems and built integrated ETL steps which extended the use of our own APIs. Alex always looked forward to the challenges and was keen to find solutions. He uses his wide ETL experience to try different solutions for each problem. Alex is a highly skilled ETL developer, and it was a pleasure to work with him.
Olga Pogozheva
Alexander is an astounding professional - scrupulous, attentive to details, always coming up with the solutions, both technical and business. He approaches the problem from both the inside and outside perspectives, taking into account business side of the technical solution at all times. While working at Mellivora Software as a CTO & Senior Data Architect, Alexander had been tensely involved in ETL and Big Data projects, and his core strength and tech stack involved (not limited to) Pentaho and Hadoop ecosystem, and all of the following: Stream data: Apache Kafka Indexing: ElasticSearch Computational module: Hadoop (Cloudera): Hive, Impala, HBase, Sqoop, Spark ETL and workflows: Oozie, Apache NiFi, Pentaho Kettle Front-End: Ruby-on-rails, Postgresql, Apache Zeppelin, Jupyter Platforms: Amazon AWS, Google Cloud BackEnd: GraphDB (Apache TinkerPop stack: Gremlin, JanusGraph/Titan, ElasticSearch 6.0) Languages: Java, Python, SQL It's been a pleasure working with Alexander, he's a true asset to both ours and the clients' teams. My highest possible recommendation.
David Clarkson
Alex and I worked together on a travel based client project, where the goal was to aggregate multiple sources of data into a single validated set. The project had some customer and hardware driven constraints to work within, mainly around technologies and system resources. The data Inputs and Outputs ranged from MySQL, XML, JSON and Binary files, Couchbase and MongoDB, with limited system resources. In addition to this Alex worked directly with complex internal systems and built integrated ETL steps which extended the use of our own APIs. Alex always looked forward to the challenges and was keen to find solutions. He uses his wide ETL experience to try different solutions for each problem. Alex is a highly skilled ETL developer, and it was a pleasure to work with him.
Experience
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Mellivora Software
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Ukraine
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IT Services and IT Consulting
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1 - 100 Employee
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Senior Data Scientist / Data Architect
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Dec 2021 - Present
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BigData / ETL specialist, Consulting
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Jan 2019 - Present
Mellivora Software helps SME and Enterprise businesses build custom IT solutions for a bunch of specific industries. Our core expertise is focused around:★ Big Data and Cluster technologies (Hadoop, AWS, Azure)★ NLP technologies★ Data Science/Machine LearningPM me if you have a project we could give you a hand with.
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Avi Health service
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Spain
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Wellness and Fitness Services
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1 - 100 Employee
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AI/ML Engineer
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May 2022 - Present
*) Integration of Health Score into the insurance scoring model for corporate clients; *) Creation and maintenance of a model for predicting changes in user habits. *) Integration of Health Score into the insurance scoring model for corporate clients; *) Creation and maintenance of a model for predicting changes in user habits.
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Upwork
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United States
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Software Development
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700 & Above Employee
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Senior Data Engineer
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Jul 2021 - Jan 2023
Snowflake migration, Responses to Tealium&Braze migration Snowflake migration, Responses to Tealium&Braze migration
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Envion Software
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United States
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Software Development
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1 - 100 Employee
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Data Warehouse/ Data Lake architect
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Feb 2016 - Dec 2018
• Creating a Hadoop cluster system to process heterogeneous data (ETL, Hadoop cluster, RDF/SparQL, NoSQL DB, IBM DashDB); • ETL processes for big amount of database; • DataWarehouses creation and support • Creating a Hadoop cluster system to process heterogeneous data (ETL, Hadoop cluster, RDF/SparQL, NoSQL DB, IBM DashDB); • ETL processes for big amount of database; • DataWarehouses creation and support
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DivisionsLabs Ltd
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Saint Petersburg, Russian Federation
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Head Of Information Technology Department
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Jan 2014 - Jan 2016
Working at the computer vision project. Creation of automatic recognition systems to improve safety on the roads. • Work Planning, scrum; • Technical guide • Communication with team (3 departments and 15 persons); • Business analyses; • Hiring personal and KPI; • General architecture and expertise Achievements: From the beginning we had a team with 3 developers and a camera prototype. • Under my supervision we created programs and hardware product, developed analytical platform. • The number of my team members increase up to 15 members. • Organized admin division for admins, monitoring and developing departments. Show less
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A-moda Trade, Ltd
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Saint Petersburg, Russian Federation
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CEO/Co-Founder
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Apr 2013 - Dec 2015
CEO & Co-Founder at a private fashion house in St Petersburg. My responsibilities include: - strategic planning for the company's direction - supervising of business processes - financial planning - documentation automation CEO & Co-Founder at a private fashion house in St Petersburg. My responsibilities include: - strategic planning for the company's direction - supervising of business processes - financial planning - documentation automation
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Saint Petersburg State University
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Russian Federation
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Higher Education
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200 - 300 Employee
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Assistant Professor
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Sep 2008 - Jun 2014
Member of the Database and Information Management Research Group (http://meta.math.spbu.ru/en/papers.shtml) Member of the Database and Information Management Research Group (http://meta.math.spbu.ru/en/papers.shtml)
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ISM LTD
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United States
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Entertainment
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1 - 100 Employee
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Senior Developer / Database Developer / Data scientist
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Oct 2010 - Dec 2013
Building data warehouse on Oracle environment, creating OLAP cubes and reports for business needs Tools: C#, MSSQL 2008,.NET, Database development (Oracle DB), data integration Building data warehouse on Oracle environment, creating OLAP cubes and reports for business needs Tools: C#, MSSQL 2008,.NET, Database development (Oracle DB), data integration
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Education
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2007 - 2011
Saint Petersburg State University
Doctor of Philosophy - PhD, Information Technology -
2002 - 2007
Санкт-Петербургский Государственный Университет
Master's degree, Computer Engineering
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