- Senior Software Engineer2015 - PRESENTCisco Systems
- Built an API gateway and data processing/aggregation microservices using Springboot for a distributed monitoring solution.
- Made key contributions to the design and implementation of a Java auth framework based on Oauth2.
- Implemented a project management system on top of Openstack API.
- Increased stability and security of an open sourced monitoring Ruby-based agent by refactoring and implementing the authentication layer.
- Boosted performance of the data ingestion service by 60% by analyzing code with profiling tools and fixing identified issues (decreased auth overhead, optimized payload processing).
- Implemented product licensing capabilities in monitoring solution by building middle-tier services and integrating with licensing service.
Technologies: Java, JavaScript, Go, Python, Spring, Ruby, Jersey, Docker, AWS, Kafka, Elasticsearch, Redis, Postgres, Apache Avro, Apache Mesos, MongoDB, AMQP, Openstack - Java Developer2015 - 2016Max2 (via Toptal)
- Hardened mobile app Java back-end API security by introducing a signed request feature (Amazon API like).
- Boosted performance of API back-end pagination requests by 50% by implementing Redis-based pagination.
- Increased the robustness of the API by introducing JSON schema and automated payload field validations.
- Made code more reliable and testable by refactoring and applying testability best practices.
Technologies: Java, Kafka, Scala, Play Framework, Akka, Redis, MySQL - Founder and Lead Developer2014 - 2015BSDvm
- Designed and implemented a VPS infrastructure orchestration layer in Python.
- Built a cloud provisioning system based on a custom work queue implemented with Java and Akka.io.
- Designed and implemented a cloud control panel with PHP and AngularJS.
- Built integration with Amazon AWS via Java API.
- Created the main company website.
Technologies: Java, PHP, Python, AngularJS, Play!, Apache Thrift, ZeroMQ, Akka, HTML, CSS, VMware, Amazon AWS - Engineering Manager2012 - 2014Google (via EPAM)
- Implemented a number of BI system plugins for proprietary file systems, databases, and data warehouses.
- Designed and implemented a web application that served as a metadata dictionary for the data delivered to multiple data warehouses.
Technologies: Java, JavaScript, AngularJS, GWT, HTML, CSS, Protocol Buffers - Software Engineer2011 - 2012Google (via EPAM)
- Developed a multi-purpose Java query tool based on MapReduce.
- Participated in the migration of the application from a MySQL to a NoSQL database.
Technologies: Java, Python, JavaScript - Software Engineer2010 - 2011Google (via EPAM)
- Implemented a GWT front-end framework that served as the basis for application development for a CRM administration application.
- Implemented a quick search feature that improved the UX.
- Re-engineered the application's mail queue administration view.
- Covered the application functionality with functional automated tests.
Technologies: Java, GWT, Python, Protocol Buffers, MapReduce, MySQL, NoSQL - Software Test Engineer2006 - 2010GlobalLogic
- Developed a testing framework in Java/Selenium for a web application.
- Created a number of JavaScript extensions for the Java/Selenium testing framework.
- Wrote a parser in Perl that helped to fix thousands of legacy automated tests written in Tcl.
Technologies: Java, Python, Perl, JavaScript, WebDriver, Selenium
Denys Sinyakov
Santa Clara, NY, United States
Member since February 27, 2015
Denys is a seasoned software engineer, engineering manager, and entrepreneur with over 11 years of experience. He specializes in distributed and scalable web applications targeted to run in the cloud. Has a track record of using diverse programming languages and technologies with Java being a favorite one. Since the start of his career, he has been an advocate for readable, maintainable, and testable code.
Denys is now available for hire
Portfolio
- Cisco SystemsJava, JavaScript, Go, Python, Spring, Ruby, Jersey, Docker, AWS, Kafka...
- Max2 (via Toptal)Java, Kafka, Scala, Play Framework, Akka, Redis, MySQL
- BSDvmJava, PHP, Python, AngularJS, Play!, Apache Thrift, ZeroMQ, Akka, HTML, CSS...
Experience
- Java, 10 years
- NoSQL, 5 years
- Docker, 5 years
- Spring, 3 years
- AWS ECS, 3 years
- Algorithmic Trading, 3 years
- Natural Language Processing (NLP), 2 years
Availability
Part-time
Preferred Environment
IntelliJ IDEA, Git, Mac OS, Linux, Docker
The most amazing...
...thing I've coded was a MapReduce that could process and modify the data of more than a billion records in less than 10 minutes.
Employment
Experience
- Java Quant/algorithmic Trading Framework (Development)
The framework is implemented based on Interactive Brokers Java API and open sourced back-testing engine. Allows to easily implement new trading strategies and backtest them, using historical data from multiple sources: Interactive Brokers API, Yahoo Finance API, Database, CSV files.
- Albumica (Development)
A web application that allows for sharing of photo albums across multiple social networks. Technologies used include Facebook API, Instagram API, VK API, AngularJS, Redis, and Play!
- GammaCloud (Development)
Developed a PaaS for PHP, RoR, Python, and Java app deployment. Technologies used include Go!, Ruby on Rails, MongoDB, and Docker.
- Building Modern Web Applications with AngularJS and Play Framework (Publication)Building robust web applications is often a lot about choosing the right tools. Doing so with a combination of tools that ensure both a modern, flexible front-end, and a solid, reliable back-end is something everybody wants. This article demonstrates exactly that trick by combining AngularJS and Play Framework to build a simple blog application.
Skills
- LanguagesJava, Python, JavaScript, SQL, HTML5, Go, PHP, CSS3
- FrameworksPlay Framework, AngularJS, Spring, Django, Apache Thrift, Bootstrap 3, Jersey
- Libraries/APIsInteractive Brokers' API, jQuery, Facebook API, Instagram API, ZeroMQ
- ToolsAWS ECS, Git, IntelliJ IDEA, Vagrant, VMware, VirtualBox, Amazon Virtual Private Cloud (VPC), Mesos
- PlatformsDocker, Linux, FreeBSD, Mac OS, AWS EC2, AWS Lambda
- OtherAlgorithmic Trading, Protocol Buffers, Natural Language Processing (NLP), Quantitative Finance
- ParadigmsAgile Software Development, MapReduce
- StorageMySQL, PostgreSQL, H2, MongoDB, NoSQL, Redis
Education
- Master of Science degree in Radio Electronics Engineering1999 - 2004Khmelnitsky National University - Ukraine
