MARIANA KOVALCHUK
Cumming,GA
Summary
Senior Software Engineer experienced in building and supporting business-critical applications with C#, .NET, React, JavaScript, TypeScript, and SQL. Skilled in production incident response, distributed-system troubleshooting, root-cause analysis, and application monitoring.
Overview
8
8
years of professional experience
Work History
Senior Software Engineer
Global-e US Inc.
07.2024 - Current
- Supported a business-critical e-commerce checkout platform using .NET, JavaScript, React, and SQL, with a focus on availability, reliability, and customer experience.
- Investigated and resolved blocker and critical production incidents during on-call rotations, tracing issues across checkout UI, APIs, microservices, databases, and payment-processing systems to minimize downtime.
- Resolved complex checkout issues across countries and localities, addressing differences in UI behavior, validation, formatting, and transaction flows to ensure consistent user experience.
- Enhanced ticket-resolution throughput and improved SLA performance within Kanban workflow by resolving defects causing missing confirmation pages and duplicate customer orders.
Software Engineer
Cosairus LLC
Atlanta, GA
10.2019 - 07.2024
- Developed and supported applications, tools, APIs using microservices architecture, maintaining code for complex product features with C#, JavaScript, TypeScript, React, and SQL to enhance product functionality.
- Worked on individual and team projects utilizing .NET Framework and modern .NET Core to build Web applications, wrote project documentation, and participated in technical discussions.
- Communicated with clients to align expectations and apply best practices in new code development, ensuring project requirements were met.
Software Engineer
GlobalLogic
Lviv, Ukraine
04.2019 - 08.2019
- Developed and maintained MVC and Web Forms applications in C#, resolving critical issues to enhance application reliability.
- Conducted peer reviews and technical discussions to share best practices and ensure high code quality within the team.
Junior Software Engineer
inVeritaSoft
Lviv, Ukraine
07.2018 - 02.2019
- Developed, modified, and supported internal MVC and Web Api applications, implementing backend functionality in C# and React to enhance application performance.
- Collaborated with engineers and QA to design scalable and robust systems, ensuring thorough testing for reliability.
Education
Bachelor of Science - Computer Science
Lviv Polytechnic National University
Lviv, Ukraine2019
Skills
- C#, JavaScript, TypeScript, SQL
- NET Framework, NET Core, ASPNET Core, React, HTML, CSS, jQuery
- Microservices, Distributed Systems, REST APIs, RabbitMQ, Event-Driven Architecture, OOP, SOLID Principles, Design Patterns
- Coralogix, Sentry, Application Monitoring, Centralized Logging, Production Incident Response, On-Call Support, Root-Cause Analysis
- Git, SVN, Agile, Kanban, Code Reviews, Unit Testing, Integration Testing
- Cursor, Claude, Internal AI Tools, AI-Assisted Debugging, Code Analysis, Production-Issue Investigation
- E-Commerce Checkout, Payment Integrations, Transaction Troubleshooting, Localization and Internationalization
Languages
English
Full Professional
Ukrainian
Native or Bilingual
Russian
Native or Bilingual
Japanese
Limited Working
Interests
Drawing; studying Japanese; exercising; reading books and manga
Timeline
Senior Software Engineer
Global-e US Inc.
07.2024 - Current
Software Engineer
Cosairus LLC
10.2019 - 07.2024
Software Engineer
GlobalLogic
04.2019 - 08.2019
Junior Software Engineer
inVeritaSoft
07.2018 - 02.2019
Bachelor of Science - Computer Science
Lviv Polytechnic National University