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I am Valentin Kosyanenko, a Senior Full Stack Software Developer and AI Engineer with 10+ years of experience modernizing enterprise applications and migrating legacy systems to high-performance .NET Core architectures. I specialize in integrating AI models into web and desktop apps, leveraging large language models such as Claude, Gemini, and OpenAI within the SDLC to accelerate development, optimize processes, and reduce time-to-market. I enjoy partnering with cross-functional teams to deliver scalable, user-friendly solutions and exploring privacy-first AI deployments that respect data residency.…I am Valentin Kosyanenko, a Senior Full Stack Software Developer and AI Engineer with 10+ years of experience modernizing enterprise applications and migrating legacy systems to high-performance .NET Core architectures. I specialize in integrating AI models into web and desktop apps, leveraging large language models such as Claude, Gemini, and OpenAI within the SDLC to accelerate development, optimize processes, and reduce time-to-market. I enjoy partnering with cross-functional teams to deliver scalable, user-friendly solutions and exploring privacy-first AI deployments that respect data residency.

Valentin Kosyanenko

Full Stack Developer, AI Engineer, Web Developer, +3

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I am Valentin Kosyanenko, a Senior Full Stack Software Developer and AI Engineer with 10+ years of experience modernizing enterprise applications and migrating legacy systems to high-performance .NET Core architectures. I specialize in integrating AI models into web and desktop apps, leveraging large language models such as Claude, Gemini, and OpenAI within the SDLC to accelerate development, optimize processes, and reduce time-to-market. I enjoy partnering with cross-functional teams to deliver scalable, user-friendly solutions and exploring privacy-first AI deployments that respect data residency.…I am Valentin Kosyanenko, a Senior Full Stack Software Developer and AI Engineer with 10+ years of experience modernizing enterprise applications and migrating legacy systems to high-performance .NET Core architectures. I specialize in integrating AI models into web and desktop apps, leveraging large language models such as Claude, Gemini, and OpenAI within the SDLC to accelerate development, optimize processes, and reduce time-to-market. I enjoy partnering with cross-functional teams to deliver scalable, user-friendly solutions and exploring privacy-first AI deployments that respect data residency.

Available to hire

I am Valentin Kosyanenko, a Senior Full Stack Software Developer and AI Engineer with 10+ years of experience modernizing enterprise applications and migrating legacy systems to high-performance .NET Core architectures.

I specialize in integrating AI models into web and desktop apps, leveraging large language models such as Claude, Gemini, and OpenAI within the SDLC to accelerate development, optimize processes, and reduce time-to-market. I enjoy partnering with cross-functional teams to deliver scalable, user-friendly solutions and exploring privacy-first AI deployments that respect data residency.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Advanced

Work Experience

Senior Full Stack Software Analyst and AI Engineer (Freelancer) at CODIA

May 1, 2025 - Present

Led the architecture and development of end-to-end applications integrating AI APIs and AI Agents implementing a privacy-first, local LLM deployment strategy aligned with Canadian data residency standards (Bill C-27). Designed service offerings spanning custom AI Agents, RAG systems, LLM integration, and software modernization, with polyglot server-side approach: C#/.NET, Node.js for enterprise logic, Python for AI orchestration. Develop frontend UI using Angular, React for web UI and WPF/Avalonia UI for desktop. Collaborate with owners and managers of businesses to identify, evaluate, and prioritize automation opportunities. Deliver clear, data-driven project updates and technical recommendations to end users. Monitor emerging AI technologies to continuously modify the solution base with new AI opportunities and direct technical recommendations.

Programmer Application Analyst / Full Stack Developer at SS&C Technologies Inc.

November 1, 2011 - April 1, 2025

Designed and developed full-stack enterprise applications delivering end-to-end product features across frontend, backend, and database layers. Modernized legacy systems (Classic ASP, C++) to .NET Core and Angular platforms, including upgrading frameworks to improve compatibility with modern technologies. Built scalable backend services and REST APIs using .NET Core and Node.js to support high-volume financial systems and third-party integrations. Developed responsive frontend applications using Angular and React to deliver modern, user-focused web experiences. Optimized databases and facilitated MS SQL Server transitions to support high-volume financial and analytical operations. Collaborated with cross-functional teams including product managers, QA, and research associates to deliver business-critical software features. Utilized GitHub, TFS, Jenkins and CI/CD pipelines for automated build, testing, and deployment. Developed reports and data analytics tools using Crystal Reports and

Application Developer / Software Engineer 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)

April 28, 2008 - October 29, 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.