Full-Stack Software Engineer, React, .NET

Symphony Solutions

. Design, develop, test, and maintain applications using C#, .NET Framework, and modern .NET (.NET Core / .NET 6+) .

Posted 9/15/2026full-timeRemote • UkraineMid-LevelSeniorWebsite

Core Competencies

Role fit

Core Competencies

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

Demonstrates expertise in .NET application development, including proficiency in C#, .NET Core, and RESTful API design. Capable of modernizing legacy systems and optimizing application performance while collaborating effectively within Agile teams.

Highest-signal resume keywords

C# DevelopmentASP.NET CoreEntity Framework CoreRESTful API DesignAgile Methodologies

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

.NET Framework.NET CoreMicroservicesSQL ServerLINQAsynchronous ProcessingEvent-Driven PatternsHTML5TypeScriptReact

Tools & Technologies

GitAzure DevOpsJenkinsOctopusCI/CD

Industry Keywords

Cloud-Based ArchitecturesCode ReviewsEngineering StandardsTechnical DesignApplication Performance Optimization

Tech Stack

Tools & technologies

ASP.NETAzureCloudEntity FrameworkJenkinsReactReduxSCSSSQLTypeScript.NET

About the role

Key responsibilities & impact

Design, develop, test, and maintain applications using C#, .NET Framework, and modern .NET (.NET Core / .NET 6+)
Work with legacy .NET applications, understand existing architecture, and identify opportunities for incremental modernization
Refactor and modernize legacy functionality while managing risk
Apply knowledge of monolithic and distributed/cloud-based architectures
Develop clean, maintainable, testable, and reusable code
Participate in code reviews and contribute to engineering standards and best practices
Design and develop RESTful APIs and microservice-based solutions
Work with API contracts, versioning, authentication, authorization, error handling, logging, and service-to-service communication
Build independently developed, tested, deployed, and scalable services where appropriate
Apply asynchronous processing, messaging, and event-driven patterns
Develop and maintain data access layers using Entity Framework Core
Work with Code First, database migrations, LINQ, relationships, transactions, and change tracking
Diagnose and optimize database queries and application performance
Work with SQL Server and relational database concepts
Contribute to Agile projects and Scrum team workflows
Develop and unit test back-end and front-end web application features, including maintenance and support
Collaborate with design, development, quality assurance, and operations teams

Requirements

What you’ll need

3-5+ years of .NET and application development experience
Experience building REST APIs with ASP.NET Core, .NET Core / .NET MVC, and C#
Familiarity with HTML5, SCSS, TypeScript, React, and Redux
Experience with Entity Framework
Experience with source control systems; Git preferred
Understanding of DevOps and CI/CD processes
Familiarity with technical design, architecture, best practices, and patterns
English proficiency at B2 level
Experience working with AI technologies, including integrating AI features or tools into applications
Desired: Experience with Azure DevOps, Jenkins, or Octopus

Benefits

Comp & perks

🌐 Worldwide ❌ Jobs You've Hidden ⭐️ Saved Jobs ✅ Applied Jobs ✉️ Email Alerts 👤 Account Symphony Solutions Website LinkedIn All Job Openings 501 - 1000 employees Founded 2008 🤖 Artificial Intelligence 🎮 Gaming ☁️ SaaS Artificial Intelligence
Gaming
SaaS Symphony Solutions is a software company that builds AI-powered platforms and services focused on iGaming and enterprise software. Their public site highlights products such as BetSymphony (a turnkey iGaming / sportsbook and online casino platform), BetHarmony (an AI-powered conversational agent and bet recommendation system), Harmony (an AI assistant for customer service), and Symphony Cloud (a cloud development environment and DevOps tooling). They market AI-driven business transformation services and platform solutions for operators and enterprises, and also reference a corporate charity initiative. Full-Stack Software Engineer, React, .NET Job not on LinkedIn 🔥 0 minutes ago 🌐 Ukraine, Poland, +4 more countries – Remote ⏰ Full Time 🟡 Mid-level 🟠 Senior 🧑‍💻 Full-stack Engineer 👻 Ghost score 10% ASP.NET Azure Cloud Entity Framework Jenkins React Redux SCSS SQL TypeScript .NET Apply Now Customize resume + cover letter Report problem ☆ Save ☑️ Mark as applied ❌ Hide 📋 Description
Design, develop, test, and maintain applications using C#, .NET Framework, and modern .NET (.NET Core / .NET 6+)
Work with legacy .NET applications, understand existing architecture, and identify opportunities for incremental modernization
Refactor and modernize legacy functionality while managing risk
Apply knowledge of monolithic and distributed/cloud-based architectures
Develop clean, maintainable, testable, and reusable code
Participate in code reviews and contribute to engineering standards and best practices
Design and develop RESTful APIs and microservice-based solutions
Work with API contracts, versioning, authentication, authorization, error handling, logging, and service-to-service communication
Build independently developed, tested, deployed, and scalable services where appropriate
Apply asynchronous processing, messaging, and event-driven patterns
Develop and maintain data access layers using Entity Framework Core
Work with Code First, database migrations, LINQ, relationships, transactions, and change tracking
Diagnose and optimize database queries and application performance
Work with SQL Server and relational database concepts
Contribute to Agile projects and Scrum team workflows
Develop and unit test back-end and front-end web application features, including maintenance and support
Collaborate with design, development, quality assurance, and operations teams 🎯 Requirements
3-5+ years of .NET and application development experience
Experience building REST APIs with ASP.NET Core, .NET Core / .NET MVC, and C#
Familiarity with HTML5, SCSS, TypeScript, React, and Redux
Experience with Entity Framework
Experience with source control systems; Git preferred
Understanding of DevOps and CI/CD processes
Familiarity with technical design, architecture, best practices, and patterns
English proficiency at B2 level
Experience working with AI technologies, including integrating AI features or tools into applications
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