Senior .NET/React Engineer

Role Summary

Our client, a Fortune 50 company, is seeking Senior FS Engineers with the main skill .NET Core and React/TypeScript to work on

the modernization of the fleet management platform. The client wants engineers with experience using AI-assisted development tools in practice.

The ideal candidate will have a consulting approach and engineering mindset. You will be responsible for developing and optimizing backend and frontend in a microservices-based architecture. You will work closely with cross-functional teams to ensure high-quality software delivery.

This is a long-term remote-first contract position with a required overlap of US working hours (2-6 PM CET) .

Responsibilities

As an FS Developer , you will

• Develop and maintain backend services using .NET, C# and React .
• Implement microfrontend architecture , ensuring scalability and reliability.
• Modernize and modularly decompose a large enterprise platform.
• Utilize containerization technologies like Docker and Kubernetes for deployment and orchestration.
• Work with databases including MS SQL, NoSQL, and Redis for efficient data storage and retrieval.
• Integrate authentication mechanisms using OAuth2 and JWT .
• Collaborate with DevOps teams to implement CI/CD pipelines and ensure smooth deployments.
• Apply security best practices , following OWASP guidelines to prevent vulnerabilities like SQL Injection (SQLi), Cross-Site Scripting (XSS), and Cross-Site Request Forgery (CSRF).
• Utilize Azure services , such as AppService, Service Bus, Functions, and SQL Database , for cloud-based hosting and scaling.

Requirements

Core Technical Skills

• Backend: .NET (Core), C#, Core, Entity Framework Core
• Frontend: React/Typescript, Microfrontends
• Architecture: Microservices, CQRS, Dependency Injection
• Databases: CosmosDB
• Cloud & DevOps: Azure (AppService, Functions, Service Bus, SQL Database), Docker, Kubernetes, GitHub, CI/CD
• Testing & Debugging: xUnit/NUnit, Profiling tools, Static code analysis, Postman, Fiddler
• AI Engineering Assistants Fluency
• The candidate must demonstrate practical experience using AI-assisted engineering tools, such as:
• Cursor
• Claude Code
• GitHub Copilot or equivalent tools
• Soft Skills
• Strong analytical and problem-solving skills , with the ability to diagnose and resolve complex issues under pressure.
• Excellent communication skills , capable of explaining technical concepts to both technical and non-technical stakeholders.
• Ownership mindset – the ability to work independently and as part of a team while taking full responsibility for assigned tasks.
• Proactive attitude – the ability to escalate issues early, follow up on blockers, and support teammates when needed.
• Constructive feedback approach – ability to receive and provide feedback in a way that improves overall team performance.

Preferred Experience

Azure DevOps for continuous integration and deployment.

AI Development experience

• Security best practices (OWASP, authentication standards).
• Design patterns and software architecture knowledge .

Highlights

• If you are passionate about building enterprise apps with a modern tech stack and enjoy working in a collaborative, fast-paced environment, this opportunity with our client is perfect for you.
• Type: Full-time & Long-term contract work

Start Date : ASAP

• Location: Remote (99%) in Europe; must be able to travel freely within Europe for workshops.
• US Time Zone Overlap: Required ( 2 PM - 6 PM CET )
• Contract with European LLC