Alexander is available for hire

Alexander Velichkin

Verified Expert in Engineering

.NET Developer

Location

Voronezh, Voronezh Oblast, Russia

Toptal Member Since

May 23, 2017

Alexander is a .NET开发人员，提供超过八年的领导小型团队设计web的经验, desktop, and mobile applications with a passion for .NET Core, Angular, and DevOps. Alexander擅长提供可靠和创新的策略和解决方案，以提高现有应用程序的性能并推动业务增长.

GitFlow C#.NET .NET C#LINQ to SQL SQL Microsoft Visual Studio ASP.NET MVC 5 ASP.NET Web Forms Git Visual Studio 2017 MVC Razor Visual Studio 2013 Microsoft Kinect SendGrid API SQL Server Prism Classic ASP

Portfolio

Debate.org (via Toptal)

Azure DevOps, Git, RabbitMQ, jQuery，经典ASP, Microsoft SQL Server...

Atos IT Solutions and Services, LLC.

Microsoft SQL Server, TFS, Git, Model View ViewModel (MVVM), Prism...

Donation Kiosk (via Toptal)

JSON, XAML, Git, Windows Presentation Foundation (WPF)

Experience

C# - 8 years .NET - 8 years ASP.NET - 7 years Microsoft SQL Server - 7 years Windows Presentation Foundation (WPF) - 5 years PostgreSQL - 3 years .NET Core - 1 year Azure DevOps - 1 year

Availability

Part-time

Preferred Environment

TFS, Git, DataGrip, Visual Studio Code (VS Code), Visual Studio

The most amazing...

...我分析和改进的项目性能是一个基于web的应用程序，它有大量的报告和数千个用户同时工作.

Work Experience

Senior C# .NET Developer

2018 - PRESENT

Debate.org (via Toptal)

Eliminated spam by creating a Regex-based, 后端服务，通过RabbitMQ与web应用程序通信，并自动过滤用户内容.
Integrated third-party services Google ReCaptcha, Analytics, AdSense and Taboola Ads, Pingdom, and SendGrid with a web application—resulting in increased revenue, performance, and accessibility.
将运行经典ASP的web应用程序的加载速度提高了40%.NET WebForms, DevExpress, jQuery, and MS SQL.
开发工具，管理员使用DevExpress HTML编辑器创建网页，而不涉及程序员.
通过使用Azure DevOps引入新的CI/CD流程来扩展和扩展开发功能，并为使用AWS的现有web应用程序设置新的开发和测试环境.
最小化在AWS EC2 (Windows Server)和RDS (MS SQL Server)机器上维护web应用程序和后台服务的停机时间.

Technologies: Azure DevOps, Git, RabbitMQ, jQuery，经典ASP, Microsoft SQL Server, Entity Framework, DevExpress, ASP.NET Web Forms, C#

Senior C# .NET and Xamarin.Forms Developer

2016 - 2018

Atos IT Solutions and Services, LLC.

Developed web application using ASP.. NET Web Forms和DevExpress组件为全球房地产公司自动化工作流. App tracked CapEx and OpEx movement and generated PDF and XLS reports.
使用ComponentPro简化了Excel报表的操作构建模块, 开发Windows服务来执行后台的长时间处理操作, and creating Xamarin.Forms applying UI components.
优化了Xamarin和Xamarin使用的多平台库的数据共享设计.Forms and ASP.NET MVC projects to synchronise, serialize, encrypt, and validate data sent between Android smartphones and server.
使用MS SQL Server和本地MySQL数据库开发自动同步库，使最终用户能够离线工作，并在稍后的时间间隔与服务器端数据库同步数据.
提高了XLS和PDF报告的性能，减少了50%的生成时间.
设计并创建了一个VBA MS Access应用程序，供多个用户同时使用，具有报表和身份验证功能.

技术:Microsoft SQL Server, TFS, Git, Model View ViewModel (MVVM)， Prism, Xamarin.Forms, PDFtk, ComponentPro, DevExpress, SQL Server 2012, ADO.NET, Web Forms, ASP.NET, C#

Senior WPF and C# Developer

2017 - 2017

Donation Kiosk (via Toptal)

为触摸屏定制控件(如按钮)制作了一个WPF应用程序, labels, and list views.
节省了通过JSON使用PHP后端向桌面WPF应用程序添加自动更新功能的无数时间.

Technologies: JSON, XAML, Git, Windows Presentation Foundation (WPF)

Senior C# .NET Developer

2016 - 2017

MotionGlass

使用ASP编写了一个带有英特尔RealSense摄像头和基于web的管理面板的桌面WPF应用程序.NET MVC and MS SQL Server.
为WPF应用程序和基于web的管理面板之间的交互创建了一个WCF服务，用于远程访问.

Technologies: Microsoft Kinect, Git, Entity Framework, Microsoft SQL Server, Intel RealSense, Windows Communication Foundation (WCF), Windows Presentation Foundation (WPF), ASP.NET MVC, .NET, C#

Load-testing Engineer

2016 - 2016

Home Credit and Finance Bank, LLC.

通过使用JMeter为负载测试创建测试计划和使用Python 3为日志文件分析创建脚本，增强了性能.
Prepared sample data for test plans using the Oracle database.

Technologies: Git, Oracle, Python 3, Apache JMeter

ActionScript 3 and C# .NET Developer

2012 - 2016

BI-Leasing, LLC.

Streamlined operations, 架构内部应用程序，使用PostgreSQL实现基于角色访问的流程自动化, ASP.NET Web API, AngularJS, and FastReport .NET.
Developed an advertisement application using Kinect 2, WPF, and ASP.NET MVC boosting visibility.
使用WPF为现有客户构建了一个允许在线银行的互联网kiosk应用程序.
使用OpenStreetMap API和ActionScript 3创建了一个地图应用程序.0 for Windows, Android, and iOS platforms.
开发ActionScript 3 UI组件库的加速知识共享被不同项目的多个团队使用.

Technologies: Visual Studio, Subversion (SVN), Git, ActionScript 3, PostgreSQL, Microsoft SQL Server, Entity Framework, Microsoft Kinect, FastReport, AngularJS, LINQ, Web API, Windows Presentation Foundation (WPF), .NET, C#

Experience

K-Visor

http://k-visor.com

K-Visor是一款交互式Windows应用程序，可为您提供更有效，更方便的方式，在出席人数众多的地方提供您的产品或服务.

K-Visor can be used do attract passers-by. An image from display starts interacting with them, 抓住他们的注意力，使他们能够通过几个简单的手势浏览有关商品和服务的信息.

Kiosk Application

我为触摸屏显示器开发了一个WPF应用程序，以便使用VISA向不同的组织进行支付, MasterCard, AmEx payment cards. 它有多种功能，如添加电子邮件订阅和通过门户网站管理帐户.

将应用程序交付给带有触摸屏显示器和所有必要硬件的客户端.

Data Sync Library

I developed a .跨桌面应用程序同步数据的基于net的库(使用本地MySQL安装), 服务器web应用程序(使用MS SQL server安装)和Xamarin.Forms application (using SQLite). 上面列出的所有应用程序都通过RESTful后端(ASP)在彼此之间传输数据.NET Web API).

Background Service

我开发了一个后台服务，用来执行后台操作. 其中一项操作是自动删除用户添加的垃圾内容. 该任务基于正则表达式规则，通过web界面进行管理.

This task made it easier for moderators to work.

Skills

Languages

Active Server Pages (ASP), C#.NET, C#, SQL, HTML5, ASP.NET Razor, JavaScript, XML, Python 3, CSS, HTML, TypeScript, Visual Basic for Applications (VBA), Visual Basic .NET (VB.NET), Excel VBA, Python, ActionScript 3, XAML

Frameworks

ASP.NET Web Forms, .. NET、Entity 6、Windows Presentation Foundation (WPF)、Microsoft Kinect、Razor Pages、MVC Razor、ASP.NET MVC 5, .NET 5, .NET 2, .NET 3, ASP.NET MVC 6, NUnit, ASP.NET Core MVC, Entity 5, ASP.NET Core, ASP.NET, ASP.NET MVC, ASP.NET Core 2, .NET 4, .NET Core, Entity Framework Core, ASP.NET Web API, Newtonsoft JSON, ADO.NET, AngularJS, ASP.NET MVC 4, Bootstrap, Razor, ASP.NET Identity, Angular, Classic ASP

Libraries/APIs

SendGrid API, Web API 2, Web API, JSON API, Entity Framework, Selenium WebDriver, Linq2SQL, ASPX, REST APIs, OpenStreetMap API, jQuery, LINQ, Fluent API, SignalR, AutoMapper, OpenID, Node.js

Tools

LINQ to SQL, DotTrace, Visual Studio .NET, Visual Studio 2015, ReSharper, TFS, Visual Studio 2013, Microsoft Visual Studio, Git, Visual Studio 2019, SendGrid, Visual Studio, Bitbucket, C#.NET WinForms, GitHub, WebStorm, Apache JMeter, xUnit.net, JetBrains Rider, DataGrip, Azure DevOps Services, PDFtk, Prism, RabbitMQ, Webpack, Gulp, Subversion (SVN), FastReport, Jira

Platforms

Visual Studio 2017, Amazon EC2, Visual Studio Code (VS Code), Windows, Oracle, ComponentPro, Amazon Web Services (AWS), Azure

Storage

SQL Server 2012, SQL Server 2014, SQL Server 2010, SQL Server 2008 R2, SQL Server 2016, SQL Server 2017, SQL Server 2005, Databases, Microsoft SQL Server, PostgreSQL, JSON, SQLite, MySQL, Web Forms

Other

GitFlow, Xamarin.Forms, DevExpress, Windows Communication Foundation (WCF), Intel RealSense, DevExpress Controls, Ajax, APIs, Back-end, Back-end Development, Web Development, Full-stack, EF6 Code First, DI

Paradigms

Dependency Injection, REST, RESTful Development, Code First, Database First, Waterfall Development, Azure DevOps, Back-end Architecture, Test-driven Development (TDD), Unit Testing, Model View ViewModel (MVVM)

Education

2011 - 2013

Master of Science (MS) Degree in Information Systems and Technologies

Voronezh State Technical University - Voronezh, Russia

2007 - 2011

信息系统与技术理学学士学位

Voronezh State Technical University - Voronezh, Russia

Certifications

APRIL 2020 - PRESENT

Become an ASP.NET Core Developer

APRIL 2020 - PRESENT

ASP.NET Core New Features

APRIL 2020 - PRESENT

ASP.NET Core: Middleware

APRIL 2020 - PRESENT

ASP.NET Core: Razor Pages

APRIL 2020 - PRESENT

ASP.NET Core: Security

APRIL 2020 - PRESENT

ASP.NET Core: Test-driven Development

APRIL 2020 - PRESENT

Building and Securing RESTful APIs in ASP.NET Core

APRIL 2020 - PRESENT

Deploying ASP.NET Core Applications

APRIL 2020 - PRESENT

Learning Entity Framework Core

MARCH 2020 - PRESENT

Learning ASP.NET Core MVC

LinkedIn Learning

MARCH 2020 - PRESENT

Microsoft Certified Solutions Associate

Microsoft

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