Middle Full-Stack Engineer, .NET

JustAnswer

. Design, build, and improve React frontend experiences supporting payment flows and customer interactions .

Posted 11/2/2026full-timeRemote • UkraineMid-LevelSeniorWebsite

Core Competencies

Role fit

Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates expertise in designing and developing React frontend experiences and backend integrations using C# and .NET, with a strong focus on payment flows and system reliability. Proficient in SQL and automated testing frameworks, with a commitment to continuous improvement and collaboration in a high-load environment.

Highest-signal resume keywords

React Frontend DevelopmentC# and .NET FrameworksSQL Query OptimizationAutomated Testing with Jest and NUnitGenerative AI Tools Experience

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

ReactC#ASP.NETHTML5CSS3JavaScriptTypeScriptSQLAutomated TestingPayment Flow Logic

Soft Skills

CollaborationProblem-SolvingCommunication

Tools & Technologies

JestNUnitPlaywrightReact Testing LibraryOpenAICopilotCursor

Industry Keywords

Payment IntegrationHigh-Load EnvironmentIterative DevelopmentService CoordinationTechnical Improvements

Tech Stack

Tools & technologies

JavaScriptJestReactSQLTypeScript.NET

About the role

Key responsibilities & impact

Design, build, and improve React frontend experiences supporting payment flows and customer interactions
Contribute to backend development for integrations, service coordination, and existing-system enhancements using C# and .NET
Write, maintain, and improve automated tests
Work with internal systems and third-party providers on payment-related integrations
Collaborate with engineers and cross-functional partners in an iterative development environment
Work with complex SQL queries and data flows in a high-load environment
Implement technical improvements for payment experience, system reliability, and operational efficiency
Translate business needs into reliable technical solutions
Use AI-assisted development tools to support productivity and delivery
Participate in code reviews and contribute to engineering standards

Requirements

What you’ll need

Minimum of 3 years of professional experience in software engineering, with a front-end focus
Proficiency in .NET frameworks, C#, and data access technologies
Proficiency in HTML5, CSS3, JavaScript, TypeScript, and React
Knowledge of MS SQL, including complex queries and performance-sensitive data scenarios
Familiarity with unit and integration testing using Jest, NUnit, Playwright, React Testing Library, or similar frameworks
Interest in learning the payments domain and understanding payment-flow business logic
Experience with LLMs / Generative AI tools such as OpenAI, Copilot, or Cursor
Upper-intermediate level of English or higher

Benefits

Comp & perks

Inclusive workplace
Equal opportunity employer
AI Disclosure and Consent Policy regarding AI use during the hiring process