Software Developer Senior

Sergiy (Serge) Klokov

Senior Software Developer .NET, C#, SQL, Angular, JavaScript/TypeScript, Python, AI/ML.NET

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/serge-klokov-ab1b67b8

Professional Summary

Senior Software Developer, Team Lead, Coder, and former Software Development Company Owner with over 20 years of experience designing, developing, and optimizing sophisticated web and database applications. Proficient in C#, .NET, AI/ML.NET, Angular, TypeScript, and SQL, with deep expertise in full-stack development, database architecture, and system enhancements. Demonstrated success in delivering scalable, high-performance solutions across financial, healthcare, and e-commerce industries. Adept at leading Agile teams, driving CI/CD pipeline implementation, and mentoring developers to achieve strategic goals. Seeking senior-level software development or leadership roles with flexibility for on-site, hybrid, or remote work.

Key Skills

Languages & Frameworks: C#, .NET 8, ASP.NET MVC, Angular (11-19), TypeScript, JavaScript, Java, Python, SQL, GraphQL

Databases: MS SQL Server (2016-2022), Azure Cosmos DB, Mongo, 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 19, MS SQL Server 2019/Mongo DB, Entity Framework Core.

Developed and deployed self-hosted .NET applications with Azure Cosmos DB (MongoDB API), integrating MVC/Razor, Angular clients, and Azure Functions for geographical data processing.

Supporting, enhancing, bug fixing for legacy .NET 4.7.2 applications with MS SQL Server and Azure Cosmos DB, integrating MVC/Razor, Dapper ORM.

As Team Lead for a standalone project, I managed the development of C# VSTO Outlook add-ons and supported legacy .NET Framework 4.8 MVC applications, enhancing functionality and user experience for over 10,000 clients.

Implemented several CI/CD pipelines with TFS, Jenkins and Azure DevOps, Harness with OpenShift, streamlining deployments and reducing release cycles.

Using Splunk logging and AppDynamics for troubleshooting in Prod and lower environments.

Bug fixing in 3rd party application which utilize AI for vector image recognition, written in Python and neo4j database.

Environment: .NET Core/8, Angular, TypeScript/JavaScript, MS SQL Server 2019, Azure, TFS, Jenkins, PowerShell, TDD, Agile/Scrum, GitHub CoPilot, Python, neo4j, GraphQL.

Aetna (Medicaid Division), Phoenix, AZ

Senior Developer

August 2015 – October 2018

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

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

Klokov Software Solutions, Kiev, Ukraine – euregon AG, Augsburg, Germany

Team Lead & Owner

April 1998 – June 2007

Founded and led a software development company, managing a team of 6 developers to deliver database solutions for TV-park publishing company’s marketing, bookkeeping, and other divisions.

Developing custom software to integrate accounting systems with manufacturing hardware for small businesses, utilizing Visual FoxPro and client-specific databases.

Directed the design and implementation of database systems using Delphi 4/5, Visual Basic 6, and MS SQL Server 2000/7, improving data processing efficiency by 25% across client divisions.

Oversaw deployment of applications on Windows NT/9x clients and Windows NT Server/UNIX (Linux, BSD) servers.

Mentored team members in database modeling with Sybase DataArchitect 5.5 and PowerDesigner 7.

Managed project lifecycles, client communications, and resource allocation, driving successful delivery under tight deadlines.

Environment: Delphi 4/5, MS VSS, Visual Basic 6, Visual FoxPro 7, MS SQL Server 2000/7, Windows NT/9x, Sybase DataArchitect 5.5, Sybase PowerDesigner 7, Windows NT Server

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

Contact this candidate