C# Software Developer

Sergiy Klokov

Senior Software Developer .NET, C#, Angular, SQL

Phoenix, AZ 480-***-**** *******@*****.***

Links: stackoverflow.com/users/3394776/sam-sergiy-klok, github.com/sam-klok, github.com/sergeklokov, examples.20m.com, www.HackerRank.com/profile/samklok, www.Linkedin.com/in/sam-klokov-ab1b67b8

Professional Summary

Accomplished Senior Software Developer with over 20 years of experience designing, developing, and optimizing complex web and database applications using C#, .NET, Angular, TypeScript, and SQL. Expert in full-stack development, database design, and system upgrades, with a proven track record of delivering scalable solutions in financial, healthcare, and e-commerce sectors. Skilled in leading Agile teams, implementing CI/CD pipelines, and enhancing system performance. Seeking senior-level software development roles with flexibility for on-site, hybrid, or remote work.

Key Skills

Languages & Frameworks: C#, .NET 8, ASP.NET MVC, Angular (11-12), TypeScript, JavaScript, Java, Python

Databases: MS SQL Server (2016-2022), Azure Cosmos DB, Neo4j, Oracle 9, Sybase SQL Anywhere

Tools & Platforms: Visual Studio (2017-2022), Azure (VM, IIS, Service Bus), Git, TFS, Jenkins, Postman, Splunk

Technologies: Web API, REST, WCF, Entity Framework, SSIS, CI/CD, TDD, MVC, Razor, Blazor

Methodologies: Agile, Scrum, SDLC, Database Optimization, OOP/OOA

Certifications: Microsoft Azure Fundamentals (AZ-900, 2023), C# 5.0 (Brainbench, 2015), .NET Framework 4.5 (Brainbench, 2015)

Professional Experience

Wells Fargo (1st year via Apex Systems), Phoenix, AZ

Senior Software Developer

November 2018 – present

Developed audit/tax web application with microservices and Web API backend using C#/.NET 8, Angular 12/TypeScript, and MS SQL Server 2019, improving processing efficiency by 25% through query optimization.

Designed and implemented self-hosted .NET applications with Azure Cosmos DB, integrating MVC/Razor and Angular clients, reducing latency by 15%.

Created VSTO Outlook add-ons and maintained legacy .NET Framework MVC applications, enhancing user functionality for 10,000+ clients.

Led real estate price estimation web app development using .NET 4.7.2, Entity Framework 6.2, and Angular 11, optimizing database queries for 100M+ records, cutting execution time by 20%.

Implemented CI/CD pipelines with Jenkins and Azure DevOps, streamlining deployments and reducing release cycles by 30%.

Bug fixing in 3rd party Python/AI application (image/vector recognition) utilizing graph database neo4j.

Documented Splunk logging for user stories, resolving false positives and improving system monitoring accuracy.

Environment: .NET Core/8, Angular, TypeScript, MS SQL Server 2019, CI/CD, Cloud Foundry, Azure, OpenShift, TFS, Jenkins, Urban Code Deploy, PowerShell, TDD, Agile/Scrum, AI coding tools: GitHub CoPilot, Grok.

Aetna (Medicaid Division), Phoenix, AZ

Senior Developer

August 2015 – October 2018

Enhanced client-facing web application with advanced search capabilities using C#, MVC, Angular, and Web API, supporting millions of records and improving search performance by 30%.

Upgraded 100+ applications and 20+ Windows servers from .NET 4 to 4.5.2, resolving compatibility issues and implementing impersonation fixes under tight deadlines.

Developed SSIS packages to populate main databases from source systems, reducing data integration time by 15%.

Environment: .NET 4.5.2, MS SQL Server 2014, Visual Studio 2015/2017, TFS, TeamCity, PowerShell, SSIS, Angular, Bootstrap

Hypur, Scottsdale, AZ

Senior Developer

June 2015 – August 2015

Built modular web application for third-party banking transactions using .NET 4.5.2, MS SQL Server 2016, and Bootstrap, enabling secure cash transaction processing.

Environment: Visual Studio 2015, MS SQL Server 2016, JavaScript, TFS, HTML5

Isagenix, Chandler, AZ

Senior Programmer

February 2008 – May 2015

Developed e-commerce platform akin to Amazon using .NET 4.5, MVC 4, WCF/Web API, and MS SQL Server 2008, supporting web, Windows, and Android apps, increasing sales throughput by 20%.

Independently delivered Events project (MVC & Web API) in record time, enhancing customer engagement for 5,000+ users.

Leveraged Xamarin and Azure for mobile app integration, improving cross-platform performance.

Environment: .NET 4.5, MVC, Razor, WCF, MS SQL Server 2008, Xamarin, Azure, jQuery, Knockout.js, T4MVC

Dallas County, Dallas, TX

Programmer Analyst

August 2006 – January 2008

Built database-driven website integrated with mainframe via BizTalk, using ASP.NET, C#, and MS SQL Server 2000, improving public access to county services.

Environment: .NET 2.0, MS SQL Server 2000, Visual Studio 2005, BizTalk, JavaScript

Education

Master of Science in Computer Science / Radio Engineering

Kiev International University of Civil Aviation, Kiev, Ukraine

Graduated with Honors

Additional Training: Developing Web Applications with Microsoft Visual Studio (Course 10264A), Dynamic Worldwide Training, Phoenix, AZ

English Language Training: Santiago Canyon College, Orange, CA

Projects

Real Estate Price Estimation App .NET 4.7.2, Angular 11, MS SQL Server 2016

Designed full-stack web app with complex geographical data calculations, optimizing queries for 100M+ records, reducing processing time by 20%.

Audit/Tax Web Application .NET 5/8, Angular 12, Azure Cosmos DB

Developed microservices-based application with self-hosted .NET components, improving scalability and reducing latency by 15%.

Error Logging API C#, .NET, Postman

Created API for centralized error logging, tested via Postman, enhancing system diagnostics and reducing resolution time by 20%.

Additional Information

Languages: English (Fluent), German, Russian, Ukrainian

Availability: Open to on-site, hybrid, or remote opportunities

References: Available upon request

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