Roman is available for hire

Roman Vashchegin

Verified Expert in Engineering

Algorithms Developer

Location

Kaliningrad, Kaliningrad Oblast, Russia

Toptal Member Since

September 5, 2013

Roman is a SharePoint and .NET developer with a proven ability to develop efficient, scalable, and fault-tolerant solutions for complex problems. He has quality experience and skills in all stages of software development, and an excellent knowledge of fundamental algorithms and data structures.

Algorithms T-SQL (Transact-SQL)ASP.NET .NET Microsoft Visual Studio C#ADO.NET SharePoint 2010 SharePoint 2007 SharePoint 2013 SharePoint Designer DevExpress SharePoint Online Windows JavaScript

Portfolio

HCL

C#, .NET Core, React, Amazon Web Services (AWS), NHibernate

STO Solutions, Inc.

Amazon Web Services (AWS), NUnit, Microsoft SQL Server, Hangfire, Backbone.js...

TapJets, Inc.

Identity Server, AngularJS, Entity Framework, RabbitMQ, .NET Core

Experience

Algorithms - 12 years T-SQL (Transact-SQL) - 11 years .NET - 10 years C# - 10 years SharePoint - 8 years ASP.NET MVC 4 - 5 years AWS SDK - 3 years .NET Core - 3 years

Availability

Part-time

Preferred Environment

Git, Subversion (SVN), TFS, Visual Studio, Windows

The most amazing...

...thing I've done is an optimization of SQL scripts and stored procedures for HarePoint Analytics for SharePoint that prevent license refunds on more than 40000$.

Work Experience

Senior .NET Engineer

2019 - PRESENT

HCL

Developed and supported various existing components of healthcare systems.
Accomplished migration from .NET 4.7.2 to .NET Core (from IIS, AWS Beanstalk to ECS).
Migrated the front end from ASP.NET MVC to React 17 (TypeScript, Material UI, and DevExtreme).
Created a new back end using GraphQL (HotChocolate 12).
Exchanged data based on HL7 and HL7 Fhir protocols.
Improved, optimized, and refactored the application.
Wrote unit tests, integration tests, and UI tests using both Selenium and Cypress.

Technologies: C#, .NET Core, React, Amazon Web Services (AWS), NHibernate

Senior .NET Engineer

2017 - 2019

STO Solutions, Inc.

Developed, from sсratch, improvements and support for different parts of a healthcare system.
Built the Job Portal to run tasks according to schedule: importing, exporting, transforming data between different sources.
Accomplished transition from MS SQL Server search to Elasticsearch that significantly boosted search results output.
Set up automatic builds and continuous integration.
Implemented cloud-based development using AWS Services (RDS, Dynamo DB, EC2, S3, Beanstalk, EKS, and ECS).

Technologies: Amazon Web Services (AWS), NUnit, Microsoft SQL Server, Hangfire, Backbone.js, NHibernate, ASP.NET MVC

Web Developer

2016 - 2017

TapJets, Inc.

Developed some functionality on the main company website. Built a partner portal for air carriers.
Created a server API for an internal mobile application for aircraft pilots.
Developed a web scraper for the Avinode website on Selenium WebDriver.

Technologies: Identity Server, AngularJS, Entity Framework, RabbitMQ, .NET Core

SharePoint Developer

2014 - 2016

Transwestern

Designed and supported www.transwestern.net (now team.transwestern.net) based on SharePoint 2010.
Designed and supported Transwestern's internal portal (https://transource.transwestern.net) based on SharePoint 2010.
Designed, developed, and supported an internal web application for building engineers with usage Nintex Workflow 2010. (https://inspector.transwestern.net).
Developed and supported a new Transwestern portal (https://www.transwestern.com). The front-end was developed on MVC4, and the back-end on SharePoint 2016.
Supported an internal portal for buildings (https://onboarding.transwestern.net) based on SharePoint 2010.
Designed, developed, and supported an internal web application for banking (check routing and cash management).

Technologies: Nintex Workflow, ASP.NET, C#, jQuery UI, Entity Framework, SharePoint

Web Developer (Part-time)

2013 - 2014

OWYS

Designed and developed a portal for a language school "Expert."

Technologies: C#, ASP.NET

Project Manager, SharePoint Developer (Full-time)

2013 - 2014

MAPILab, Ltd.

Optimized the SQL database, halving storage size and allowing T-SQL scripts to run ten times as fast.
Created a custom tool for product diagnosis and control.
Prevented three potential license refunds worth over $40,000.

Technologies: T-SQL (Transact-SQL), jQuery, JavaScript, Windows Forms (WinForms), ADO.NET, ASP.NET, C#

SharePoint Developer (Part-time)

2012 - 2013

QualityPointDev

Extended and improved the custom SharePoint workflow for a big retailer.
Created several features for the "MRSK Holding" portal.

Technologies: jQuery, ASP.NET, SharePoint, C#

SharePoint Developer (Full-time)

2009 - 2012

MAPILab, Ltd.

Created a custom GeoChart control tool to show visit counts and page views by country and city.
Implemented various tool features for exploring the SharePoint server-side object model.
Created a migration tool for SharePoint Analytics databases. Allowed for migration of analytics databases across environments, including between farms of different versions of HarePoint.
Developed a data collector and several reports for a performance reporting group. Worked with the CPU, memory, hard disk, and network.
Created a tool allowing users to subscribe to a report and receive it in PDF/XSLX format by email.
Developed a custom search engine of HarePoint HelpDesk data for SharePoint.
Implemented a custom data source for HarePoint HelpDesk supporting fast displaying, paging, sorting, and SharePoint list data filtering.
Implemented custom admin group workflow activities and conditions for HarePoint Workflow Extensions.

Technologies: jQuery, JavaScript, ADO.NET, Windows Forms (WinForms), SharePoint, ASP.NET, C#

Experience

HarePoint Analytics for SharePoint

http://www.harepoint.com/Products/HarePointAnalyticsForSharePoint/Default.aspx

Formerly MAPILab Statistics for SharePoint, HarePoint is a web analytics solution for detailed information on the performance of SharePoint-based portals and websites. Product reports include users and their behavior, as well as usage of content, documents, list items, and search services. The product provides essential information on portal usage for IT managers, project managers, web editors, and business managers.

HarePoint HelpDesk for SharePoint

http://www.harepoint.com/Products/HarePointHelpDesk/Default.aspx

HarePoint HelpDesk for SharePoint is a ready-made customer support system for internet and intranet sites based on the SharePoint platform. It allows users to create efficient systems for processing incoming support requests. The product is easily deployed and immediately ready for use.

HarePoint Explorer for SharePoint

http://www.harepoint.com/Products/HarePointExplorer/Default.aspx

A universal accessory tool to simplify the development of solutions for Windows SharePoint Services 3.0 and Microsoft Office SharePoint Server 2007, 2010, and 2013.

HarePoint Workflow Extensions

http://www.harepoint.com/Products/HarePointWorkflowExtensions/Default.aspx

HarePoint Workflow Extensions provides over 200 new 'ready-to-use' activities for Microsoft SharePoint workflow development. It is fully supported by all Microsoft workflow development tools and does not require any adjustment of workflows or learning of new development tools. The product benefits users of SharePoint Designer 2010, 2013, Microsoft Visual Studio 2010, 2013, and in Microsoft Visio 2010.

Programming Contests

Over seven years of experience in the largest computer programming contests: (ACM ICPC, TopCoder, Google Code Jam, Facebook HackerCup, Russian CodeCup, Russian AI Cup).

Semifinalist, Google Code Jam, 2008
Third Diploma, Semifinal ACM ICPC (NEERC), 2007-2010
Finalist, Russian AI Cup, 44th place (http://2012.russianaicup.ru/contest/4/standings)

Transwestern Public Website

https://www.transwestern.com

A public-facing site for Transwestern.

Publication

Conquer String Search with the Aho-Corasick Algorithm

https://www.toptal.com/algorithms/aho-corasick-algorithm

Skills

Languages

T-SQL (Transact-SQL), C#, JavaScript

Frameworks

ADO.NET, ASP.NET, .NET, NHibernate, NUnit, Entity, Bootstrap, ASP.NET Core, .NET Core, AngularJS, ASP.NET MVC 4, ASP.NET MVC, Angular, Angular Material, Hadoop, Windows Presentation Foundation (WPF)

Tools

SharePoint Designer, Microsoft Visual Studio, Hangfire, Visual Studio, TFS, Subversion (SVN), Git, AWS ELB, Amazon Virtual Private Cloud (VPC), AWS SDK, Amazon Simple Queue Service (SQS), RabbitMQ, Microsoft Silverlight

Paradigms

Object-oriented Programming (OOP), Code First

Platforms

SharePoint, SharePoint 2013, SharePoint 2010, SharePoint 2007, Nintex Workflow, SharePoint 2016, Windows, Amazon Web Services (AWS), Amazon EC2, Azure, Exchange Web Services

Other

Algorithms, Data Structures, Office 365, SharePoint Online, DevExpress, Identity Server, Architecture

Libraries/APIs

jQuery UI, jQuery, WMI, SharePoint API, REST APIs, Windows Forms (WinForms), Entity Framework, Backbone.js, Vue, Facebook API, Selenium WebDriver, React

Storage

Microsoft SQL Server, Amazon S3 (AWS S3), Amazon DynamoDB, SQLite

Education

2005 - 2010

Master's Degree in Mathematics and Computer Science

Baltic Federal University of Immanuel Kant - Kaliningrad

Certifications

JANUARY 2021 - JANUARY 2024

AWS Certified Solutions Architect Associate

AWS

DECEMBER 2020 - DECEMBER 2023

AWS Certified Cloud Practitioner

Amazon Web Services

JUNE 2017 - PRESENT

Hadoop Foundations - Level 2

IBM

MAY 2017 - PRESENT

Big Data Foundations - Level 2

IBM

SEPTEMBER 2012 - PRESENT

MCPD: Windows Azure Developer

Microsoft

FEBRUARY 2012 - PRESENT

MCPD: Windows Developer 4

Microsoft

NOVEMBER 2011 - PRESENT

MCPD: Web Developer 4

Microsoft

OCTOBER 2011 - PRESENT

MCPD: Enterprise Application Developer 3.5

Microsoft

JULY 2011 - PRESENT

MCITP: SharePoint Administrator 2010

Microsoft

JUNE 2011 - PRESENT

MCPD: SharePoint Developer 2010

Microsoft

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