Senior .NET/React Engineer

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).

Role & 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.

Work Conditions

• 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

Core Technical Skills

• Backend: .NET (Core), C#, ASP.NET 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.