Contributed to development of a real-time fintech bidding platform.
Key contributions:
- Implemented business functionality across API, database, and frontend layers.

- Developed ASP.NET Core services and REST APIs.

- Implemented real-time communication using SignalR and RabbitMQ.

- Participated in React frontend development.

- Integrated payment workflows and business processes.

Technologies: ASP.NET Core, EF Core, SQL Server, SignalR, RabbitMQ, React.

Worked on Eccentex Dynamic Case Management, an enterprise B2B SaaS platform used by multiple organizations for workflow automation, customer service operations, and case management.
Key contributions:
- Delivered custom business functionality across frontend, API, integration, and database layers.

- Implemented platform customizations and business workflows using C# and .NET.

- Customized and extended enterprise UI modules using JavaScript and ExtJS.

- Optimized Oracle and SQL Server performance through query tuning, indexing, and refactoring.

- Participated in data migration initiatives and production issue investigations, improving platform stability and reliability.
Technologies: C#, .NET, Oracle, SQL Server, JavaScript, ExtJS, React.

Primary engineer responsible for end-to-end delivery of two internal business applications:

- Insurance discounts platform (Angular + .NET Core + PostgreSQL).

- Wholesale order management system (React + .NET Core + PostgreSQL).

Key contributions:

- Designed and implemented frontend, API, database, and deployment components.

- Delivered complete business functionality across UI, services, and data layers.

- Developed Angular and React applications for business users and administrators.

- Implemented business workflows and data models.

- Owned assigned features from requirements through production delivery.

Technologies: ASP.NET Core, EF Core, PostgreSQL, Angular, React, Bootstrap.

Worked on a retail management platform with complex business workflows, dynamic data structures, and third-party integrations.

Key contributions:

- Analyzed and extended an undocumented system by studying database structures and business processes.

- Implemented full integrations with Datawiz and Horoshop, including API clients, validation, and data mapping.

- Maintained and optimized business and analytical modules.

- Worked on both integration tasks and frontend enhancements using TypeScript, Vue.js, and Kendo UI.

Technologies: C#, ASP.NET MVC4, SQL Server, TypeScript, Vue.js, Kendo UI.

Worked on a purchasing and discount platform with complex multi-level bonus and commission calculations.

Key contributions:

- Designed database structures and implemented HTTP services using ServiceStack.

- Developed a scalable multi-level commission calculation engine with recursive processing and SQL optimization.

- Integrated Stripe payment workflows.

- Contributed to core business functionality and data-processing modules.

Technologies: C#, ServiceStack, PostgreSQL, Stripe.

Worked on M.E.Doc electronic document management system.
Key contributions:
- Fixed application defects and implemented functional enhancements.
- Modified WinForms user interface components.
- Optimized SQL queries and database operations.
- Participated in maintenance and support of a large production system.
Technologies: C#, WinForms, Infragistics, Oracle, Firebird.

Worked on enterprise and government information systems for statistical reporting and business registries.
Key contributions:
- Developed functionality for statistical information systems and enterprise registries.
- Developed a distributed data replication subsystem for the State Statistics Service of Ukraine.
- Built a dynamic validation engine for a nationwide census project.
- Implemented data replication logic, SQL procedures, and business functionality.
- Developed user interface components for enterprise applications.
- Optimized SQL performance for reporting and analytical systems.
Technologies: PowerBuilder, C#, WPF, SQL Server, Sybase ASE, Sybase ASA, NHibernate, BLToolkit, Infragistics, DevExpress.

Commercial software development for BanComSviaz, Sportmaster, ECI Online, Sybase SQL Solution, and NPP SVIT.
Technologies: PowerBuilder, SQL, Oracle, Sybase, MS SQL Server.