Publication
Building Modern Web Applications with AngularJS and Play Framework
https://www.toptal.com/developers/java/building-modern-web-applications-with-angularjs-and-play-framework
Denys is currently unavailable
Denys Sinyakov
Verified Expert in Engineering
Algorithmic Trading Developer
San Francisco, CA, United States
Toptal member since April 28, 2015
Bio
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.
Portfolio
Cisco Systems
Amazon Web Services (AWS), OpenStack, AMQP, MongoDB, Mesos, Apache Avro...
Max2 (via Toptal)
MySQL, Redis, Akka, Play Framework, Scala, Apache Kafka, Java
BSDvm
Amazon Web Services (AWS), VMware, CSS, HTML, Akka, ZeroMQ, Apache Thrift...
Experience
- Java - 10 years
- Docker - 5 years
- NoSQL - 5 years
- Spring - 3 years
- Algorithmic Trading - 3 years
- Amazon Elastic Container Service (ECS) - 3 years
- Natural Language Processing (NLP) - 2 years
- Generative Pre-trained Transformers (GPT) - 2 years
Preferred Environment
Amazon Web Services (AWS), Docker, Linux, MacOS, Git, IntelliJ IDEA
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.
Work Experience
Senior Software Engineer
2015 - PRESENT
Cisco 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: Amazon Web Services (AWS), OpenStack, AMQP, MongoDB, Mesos, Apache Avro, PostgreSQL, Redis, Elasticsearch, Apache Kafka, Docker, Jersey, Ruby, Spring, Python, Go, JavaScript, Java
Java Developer
2015 - 2016
Max2 (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: MySQL, Redis, Akka, Play Framework, Scala, Apache Kafka, Java
Founder and Lead Developer
2014 - 2015
BSDvm
- 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: Amazon Web Services (AWS), VMware, CSS, HTML, Akka, ZeroMQ, Apache Thrift, Play Framework, AngularJS, Python, PHP, Java
Engineering Manager
2012 - 2014
Google (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: Protocol Buffers, CSS, HTML, GWT, AngularJS, JavaScript, Java
Software Engineer
2011 - 2012
Google (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: JavaScript, Python, Java
Software Engineer
2010 - 2011
Google (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: NoSQL, MySQL, MapReduce, Protocol Buffers, Python, GWT, Java
Software Test Engineer
2006 - 2010
GlobalLogic
- 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: Selenium, WebDriver, JavaScript, Perl, Python, Java
Experience
Java Quant/algorithmic Trading Framework
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
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
Developed a PaaS for PHP, RoR, Python, and Java app deployment. Technologies used include Go!, Ruby on Rails, MongoDB, and Docker.
Education
1999 - 2004
Master of Science Degree in Radio Electronics Engineering
Khmelnitsky National University - Ukraine
Skills
Libraries/APIs
Interactive Brokers API, WebDriver, AMQP, ZeroMQ, Instagram API, Facebook API, jQuery
Tools
Amazon Elastic Container Service (ECS), Apache Avro, Mesos, Amazon Virtual Private Cloud (VPC), IntelliJ IDEA, Git, VirtualBox, VMware, Vagrant
Languages
Java, Perl, HTML, CSS, Ruby, Scala, Python, Go, CSS3, PHP, JavaScript, HTML5, SQL
Frameworks
Spring, Play Framework, AngularJS, Selenium, GWT, Akka, Jersey, Bootstrap 3, Apache Thrift, Django
Platforms
Docker, Linux, Amazon Web Services (AWS), Apache Kafka, OpenStack, AWS Lambda, Amazon EC2, FreeBSD, MacOS
Paradigms
Agile Software Development, MapReduce
Storage
Elasticsearch, NoSQL, MongoDB, MySQL, H2, PostgreSQL, Redis
Other
Algorithmic Trading, Quantitative Finance, Natural Language Processing (NLP), Protocol Buffers, Generative Pre-trained Transformers (GPT)
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