Senior .NET Engineer

Design and implement financial and payment-processing architecture while contributing hands-on code and conducting code reviews.

Delivered payment integrations with Stripe, PayPal, Bit, and Meshulam, including recurring payments, refunds, reconciliation, invoicing, KYC, webhooks, payouts, and configurable service fees. Implemented PCI DSS-aligned secure payment architecture, near-real-time financial data, and AWS event-driven services using S3, SNS, SQS, Lambda, DynamoDB, and SES.

Use AI-assisted development tools and implement AI-powered features for spam detection and text-content moderation.

Maintained and enhanced a complex fantasy baseball platform supporting virtual-team creation, player statistics, analytics, and reporting workflows.

Worked with a highly modular system featuring an embedded Python compiler, statistics-import pipelines, report generation, MariaDB, Elasticsearch, Docker, and OpenStack.

Developed an enterprise internal video platform comparable to YouTube for employees.

Delivered media integrations, authentication capabilities, and web-platform functionality using ASP.NET Core, SQL Server, Entity Framework Core, Angular, SSO, IDP, and ADFS.

Independently developed an HR questionnaire application using .NET Core and Entity Framework Core.

Applied testable engineering practices through unit tests and an in-memory database for automated testing, with application data stored in Amazon S3.

Built systems supporting 24/7 analyst operations, high-volume filtering, and analytical workflows across hundreds of data sources.

Contributed to high-load system design, SQL Server performance optimization, enterprise integrations, and application services using ASP.NET MVC, WCF, WPF, REST APIs, AngularJS, Lucene, TensorFlow, and NLP.

Worked directly with a US medical billing company and led a team of approximately 10 engineers.

Designed and implemented online eligibility verification for healthcare billing workflows across more than 100 insurance companies. Also developed a youth education portal with code-driven learning games, media functionality, and role-based access for tutors, schools, and students.

Developed ERP functionality for production planning, warehouse inventory, assembly processes, delivery-date forecasting, and bill-of-materials calculations.

Supported enterprise workflows for a Turkish bus manufacturer.

Led a two-person quality assurance team.

Coordinated QA activities and supported software quality processes.