I am a software engineer with 10+ years of experience designing, developing, and optimizing enterprise applications using C#, .NET Core/Framework, ASP.NET MVC, Angular, SQL Server, and REST APIs. I thrive in building scalable backend services and modernizing legacy systems to meet current business needs. I enjoy solving complex engineering problems and delivering cloud-ready architectures in Agile teams. My strengths include building microservices, implementing CI/CD pipelines, containerization, and collaborating with product managers, QA, and support teams to deliver high-quality, maintainable software. I am passionate about continuous learning and applying best practices to improve system performance and reliability.

Valentin Kosyanenko

I am a software engineer with 10+ years of experience designing, developing, and optimizing enterprise applications using C#, .NET Core/Framework, ASP.NET MVC, Angular, SQL Server, and REST APIs. I thrive in building scalable backend services and modernizing legacy systems to meet current business needs. I enjoy solving complex engineering problems and delivering cloud-ready architectures in Agile teams. My strengths include building microservices, implementing CI/CD pipelines, containerization, and collaborating with product managers, QA, and support teams to deliver high-quality, maintainable software. I am passionate about continuous learning and applying best practices to improve system performance and reliability.

Available to hire

I am a software engineer with 10+ years of experience designing, developing, and optimizing enterprise applications using C#, .NET Core/Framework, ASP.NET MVC, Angular, SQL Server, and REST APIs. I thrive in building scalable backend services and modernizing legacy systems to meet current business needs. I enjoy solving complex engineering problems and delivering cloud-ready architectures in Agile teams.

My strengths include building microservices, implementing CI/CD pipelines, containerization, and collaborating with product managers, QA, and support teams to deliver high-quality, maintainable software. I am passionate about continuous learning and applying best practices to improve system performance and reliability.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
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Language

English
Fluent

Work Experience

Programmer Application Analyst / Full Stack Developer at SS&C Technologies Inc.
November 11, 2011 - April 30, 2025
Designed, developed, and supported enterprise financial applications with a focus on scalability and performance. Modernized legacy systems (Classic ASP, C++) to .NET Framework and Angular, established CI/CD pipelines. Implemented and maintained Web Services, WCF, and REST APIs to enable reliable integrations. Optimized SQL databases with stored procedures and functions to support high-volume data operations. Developed and customized financial and operational reports using Crystal Reports and XML/XSLT. Built APIs and services using .NET and NestJS, and delivered responsive Angular front-end components. Migrated applications to containerized environments with Docker to ensure high availability. Collaborated closely with business, support, QA teams to evolve solutions with changing requirements.
Business Application Analyst / .NET Software Developer at MDA Space
December 1, 2010 - November 9, 2011
Enhanced and supported applications used for data exchange with NASA and CSA. Migrated Access databases to SQL Server using ASP.NET and C#, improving performance and scalability. Developed C# applications with ADO.NET, LINQ, and Web Services. Designed relational databases, implemented stored procedures, and created reporting solutions. Worked with engineers to translate complex requirements into robust software.
Programmer Analyst / .NET Software Developer at Used Car Dealers Association of Ontario - UCDA
May 2, 2008 - October 30, 2010
Developed and maintained financial applications in C#, ASP.NET, and SQL Server. Built cross-browser web applications with ASP.NET, JavaScript, jQuery, and Ajax. Created database-driven reports using T-SQL, SSRS, and XML/XSLT. Implemented Regular Expressions to automate data extraction and improve efficiency.
.NET Software Developer at Info Locus Inc.
October 24, 2007 - April 26, 2008
Built and supported .NET and SQL Server-based enterprise applications. Designed and optimized SQL databases with stored procedures and triggers. Developed ASP.NET/C# web applications with Crystal Reports-based reporting.
Software Engineer / Programmer Application Analyst at SS&C Technologies Inc.
November 1, 2011 - April 1, 2025
Designed, developed, and supported enterprise financial applications with a focus on scalability, performance, and maintainability. Modernized legacy systems (Classic ASP, C++) into .NET Framework and Angular, improving reliability and reducing technical debt. Built and maintained REST APIs, Web Services, and WCF services for internal and third-party integrations. Designed and optimized SQL Server databases, stored procedures, and functions to support high-volume financial operations. Developed financial and operational reports using Crystal Reports and XML/XSLT. Built backend services using .NET and NestJS and developed responsive Angular UI components. Migrated applications to containerized environments using Docker, improving deployment speed and system availability. Collaborated with product managers, QA, and support teams to deliver enhancements aligned with business requirements. Utilized GitHub, TFS, Jenkins, and CI/CD pipelines to streamline development and deployment processes
Software Engineer / .NET Developer at MDA Space
December 1, 2010 - November 1, 2011
Supported and enhanced applications used for data exchange with NASA and the Canadian Space Agency. Migrated MS Access databases to SQL Server, improving performance and scalability. Developed C# applications using ADO.NET, LINQ, ASP.NET Web Services, and WCF. Designed SQL Server schemas, stored procedures, and reporting solutions. Collaborated with engineering teams to translate technical requirements into software solutions.
Programmer Analyst / .NET Developer at Used Car Dealers Association of Ontario (UCDA)
May 1, 2008 - November 1, 2010
Developed and maintained financial and membership applications using C#, ASP.NET, and SQL Server. Built cross-browser web applications using ASP.NET, JavaScript, jQuery, and Ajax. Created database-driven reports using TSQL, SSRS, and XML/XSLT. Implemented Regular Expressions to automate data extraction and improve processing efficiency.

Education

Bachelor Degree in Computer Programmer at Dnepropetrovsk Technical College, Ukraine
September 1, 1997 - April 30, 1991
Software Developer
Master Degree in Economics and Management at State University of Metallurgy of Ukraine, Dnepropetrovsk, Ukraine
September 1, 1991 - March 30, 1997
Bachelor Degree in Computer Programming at Dnepropetrovsk Technical College, Ukraine
January 11, 2030 - October 30, 2025
Bachelor's Degree - Computer Programmer at Dnepropetrovsk Technical College, Ukraine
January 11, 2030 - February 12, 2026
Master's Degree - Economics and Management at State University of Metallurgy of Ukraine
January 11, 2030 - February 12, 2026

Qualifications

Microsoft Certified Application Developer
January 11, 2030 - October 30, 2025
Microsoft Certified Professional
January 11, 2030 - October 30, 2025
Developing and Implementing Windows-based Applications with MS Visual C#.NET
January 11, 2030 - October 30, 2025
Developing and Implementing Web-based Applications with MS Visual C#.NET
January 11, 2030 - October 30, 2025
Developing and Implementing Web Services with MS Visual .NET
January 11, 2030 - October 30, 2025
Microsoft Certified Application Developer - Developing and Implementing Windows-based Applications with MS Visual C#.NET
January 11, 2030 - October 30, 2025
Microsoft Certified Professional - Developing and Implementing Web-based Applications with MS Visual C#.NET
January 11, 2030 - October 30, 2025
Developing and Implementing Web Services with MS Visual .NET
January 11, 2030 - October 30, 2025
Microsoft Certified Application Developer (MCAD)
January 11, 2030 - February 12, 2026
Microsoft Certified Professional (MCP)
January 11, 2030 - February 12, 2026
Developing Windows-based Applications with C#.NET
January 11, 2030 - February 12, 2026
Developing Web-based Applications with C#.NET
January 11, 2030 - February 12, 2026
Developing Web Services with .NET
January 11, 2030 - February 12, 2026

Industry Experience

Financial Services, Software & Internet, Professional Services, Government