Sergiy Oliynyk

Senior Software Engineer
GreenM https://greenm.io/
August 2021 - October 2024

Project: Analytics portal in health industry

Team: 5-10 engineers

• Designed and implemented a new version of email subscriptions services.
• Developed new features and fixed bugs on both front-end and back-end with focusing on back-end.
• Came out with a way to create integration tests for a data layer querying Vertica and Snowflake databases.
• Reviewed pull requests, provided help to colleagues with code improvements and design approaches.

ASP.NET, C#, AWS cloud, Angular, TypeScript, MS SQL Server, PostgreSQL, Vertica, Snowflake, GitHub

Back End Senior Software Developer
Freelance
December 2020 – May 2021

Project: Localization subsystem
Subsystem for localization of an Enterprise application

• Created REST API for Front End to get and update data in the DB

ASP.NET Core, C#, Entity Framework Core, LINQ, MS SQL Server, REST API

Full Stack Senior Software Developer
NDA Company
December 2019 – July 2020

Project: Auction-like web application with specific functionality

• Implemented requirements in all levels of the application

ASP.NET Core, C#, MS Unit, Entity Framework Core, LINQ, MS SQL Server, React, Azure, DDD, CQRS

Full Stack Senior Software Developer
Upwork https://www.upwork.com/freelancers/~0124604ec8b3b7e2a0
January 2016 – November 2019

Project: Span-America

Web based business process automation application

• Implemented requirements at both the back-end and front-end levels of the application

ASP.NET Core, C#, xUnit, Entity Framework Core, LINQ, MS SQL Server, GraphQL, React, Azure

Project: DispatcherWeb

Truck dispatch multitenant application

• Implemented requirements at both the back-end and front-end levels of the application

ASP.NET Core, C#, xUnit, Entity Framework Core, LINQ, MS SQL Server, HTML, CSS, Twitter Bootstrap, JavaScript, jQuery, ASP.NET Boilerplate framework, Azure

Project: Above Goal

Campaign Management Software for Nonprofits and Consultants

• Implemented requirements at both the back-end and front-end levels of the application

ASP.NET MVC, .NET Framework, C#, xUnit, Entity Framework, LINQ, MS SQL Server, HTML, CSS, Twitter Bootstrap, JavaScript, jQuery, ASP.NET Boilerplate framework, Azure

Full Stack Software Developer, SEO Specialist
Self-employed
August 2007 – December 2015

Project: Affiliate Web Sites

Different Web Sites for Affiliate Programs

• Created Web Sites using Visual Studio, MS SQL Server and MongoDB
• Created Web Sites using WordPress, developed WP plugins using PHP and MySql
• Implemented best practices for better ranking by search engines

ASP.NET MVC, .NET Framework, C#, NUnit, MS SQL Server, MongoDB, JavaScript, jQuery, HTML, CSS, Twitter Bootstrap, WordPress, PHP, MySql

Senior/Lead Software Developer
TechnoInfoService
February 2003 – June 2007

Project: M&I EnergySuite

Software suite for automating energy power supply companies

• Designed system and database architectures using Visual Studio 2003
• Created base classes and controls using C#
• Implemented requirements at the UI (Windows Forms), Business (.NET classes created on a server via .NET Remoting) and Database (Stored Procedures) layers using C# and MS SQL Server
• Created UnitTests using C# and NUnit
• Optimized stored procedures using SQL Profiler
• Managed a small team (2-3 engineers)

.NET Framework, C#, NUnit, MS SQL Server 2000

Senior Software Developer
Pixel GmbH https://pixel.de
November 2000 - February 2003

Project: Hotel web farm

Small sites contained hyperlinks with each other for increasing Google’s page rank

• Designed web interface using ASP
• Developed and implemented an algorithm for creating hyperlinks with the best result

ASP, ADO, MS SQL Server 2000

Project: Theke Framework

Module system for creating 3-tier applications

• Created a report module using ATL, ADO, MS SQL Server and VB Script for a time tracker system based on Theke Framework
• Fixed bugs in the Theke’s modules
• Developed Windows service for controlling business tier

MS Visual C++, ATL, DCOM, VB Script, ADO, MS SQL Server 2000, Oracle

Project: Baukasten

Small CMS designed for customer’s clients

• Designed database using SQL Server 2000
• Created modules using ASP, DHTML and Java Script

ASP, ADO, MS SQL Server 2000, IE 5.0 DHTML and Java Script

Software Developer
X-tend https://x-tend.ua/
January 1997 – November 2000

Project: Banner exchange system; Internet Tracker System

Web engine for showing ad banners on partner sites; web engine for counting and tracking web site visitors

• Created engine for showing ad banner’s images and collecting statistic using ASP, Visual C++ and MS SQL Server
• Created web based administrative user interface using ASP, VB Script, HTML and Java Script

IIS 4.0, ASP, MS SQL Server 7.0, VB Script, Java Script, Visual C++

Project: POST desktop manager

Administrative tool for computer management via the Internet

• Investigated legacy code and a database
• Developed new features and fixed bugs using Visual Basic
• Changed SQL Server database design and created stored procedures for new features
• Created extended stored procedures using Visual C++

Visual Basic 6.0, MS SQL Server 6.5, Visual C++