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Vadym H.
Last update: 13 Jun 2019
MIDDLE
Scala Developer / Data Scientist
Experienced in Scala, Play Framework, Java, Sbt, Slick, Akka, Kafka 2+ years of experience as a Data Scientist and a Scala Developer. A result-oriented, hard worker with a strong problem-solving ability. Excellent communications skills.
All rates are indicative, annual rate includes 20% discount
20% discount on yearly basis
GMT+2 East Europe
Kharkiv/Ukraine

Works

EXPERIENCE

Industry Experience

Travel & Tourism, Books & Catalogs, Information services & Technologies

Product Experience

Chat

PORTFOLIO HIGHLIGHTS

Travel Assistant

Scala Developer

Responsible for the creation of test-database and manipulations with it. It was used Cats, Doobie and H2 to complete this task. Worked with the services of the project, optimized a little bit of validation part of this service (constraints). Some tasks were done based on Akka for concurrent processing of user data and requests. Another responsibility was to cover the project with a lot of tests.

A platform for planning and organizing international traveling. Includes an advanced system for booking plane tickets and a variety of ground and water transport, building travel routes, an advanced search system, customer care, email distribution, and others.

Technologies Stack:

PostgreSQL Scala Akka REST Swagger

Industry:

Travel & Tourism

Recommendation system for a book shop

Data Scientist

Responsible for a Recommendation System micro-service, writing tests and bugfixes. Developed Recommendation Engine based on Spark Structured API (ALSModel), Streaming API (implemented the BSGD algorithm for it) and Akka. Created a lot of Actors for Spark model synchronization and updating without any downtime. Development of REST controllers based on a Play Framework later connected to Akka through a level of service classes.

A system that’s used for predicting user’s rating and opinions about books. The system makes predictions based on the opinion of every user. In addition, it calculates user’s and book’s feature vectors alone, so developer/administrator can control it.

Technologies Stack:

Cassandra Java Scala Spark Play Framework PhantomJS

Industry:

Books & Catalogs

GDPR Compliance

Data Scientist

Responsible for creation of ML module, development of unit tests and bugfixes. Data engineering (visualization, preprocessing), feature engineering (extraction, generation) and model creation (choosing, validation, testing). Responsible for Spark Estimators and Transformers. Participated in the development of a search engine used for data extraction, in particular, developed highlighter based on Lucene’s base highlighters. All tests are done using the spec2 library.

The program provides the possibility to check how different Data Processors implement GDPR. It splits the document into parts using key-words, saves them in the DB. Another part analyses parts and makes a prediction about the quality of implementation.

Technologies Stack:

Java Scala Spark Lucene Hadoop

Team chat for company

Java Developer

Responsible for the creation of some parts of a DAO system of this application, also participated in the development of Spring MVC controllers and service/model layer. Managed configuration files for a Spring IoC. It removed all repeatable code from the application using Spring AOP.

SF-based startup company

For registered users portal provides the ability of exchange messages, files and saving all messages history. A user can point favorites messages, create rooms notifications, create public and private chat rooms, search messages in history archive with the special date or on some text pattern, etc.

Technologies Stack:

Hibernate Java JavaScript jQuery MySQL Spring Spring MVC Webpack Maven

Industry:

Information services & Technologies

Product:

Chat

Works:

EDUCATION

V. N. Karazin Kharkiv National University

Bachelor's degree

Web & mobile development agency #122

Since 2005 the company has been opening the doors of its tech pool with a customer-oriented approach. A stack of our expertise covers Liferay, Alfresco and Hybris platforms in the row with the web and mobile solutions to fill clients needs. Offering software development and customization services, consulting and quality assurance for both startups at their MVP steps and for enterprises, we keep contributing to the open-source community as well. We have a special offer for professional tech startups as dedicated developers for the team extension. Their bundle of knowledge and skills of both mature and hyped technologies are up for grabs. Our extensive and versatile portfolio covers Healthcare, Media, e‑Commerce, Travel & Local, Financial, Telecommunications, Productivity, IoT and other industries where newly minted ventures can get a chance to prove themselves to the world.

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Senior React Native and Mobile Android Developer
Highly proficient in Android/Java/React Native and related technologies development. Specialized at creating a different kind of application. Detail-oriented, exceptional problem-solver with deep anal...
5 Projects completed
GMT+2 East Europe
All rates are indicative, annual rate includes 20% discount
view Profile
Updated: 13 Jun 2019