Senior .NET/React Engineer

Jimmy Technologies; United States; Remote; USD 120,000 - 160,000; Full time

Job summary

Jimmy Technologies is seeking Senior FS Engineers to modernize a fleet management platform. You will develop backend services in .NET Core and frontend in React/TypeScript, leveraging a microservices and microfrontend approach.

Responsibilities include containerization with Docker/Kubernetes, cloud hosting on Azure, and implementing secure authentication using OAuth2/JWT. The role requires overlapping US hours and remote-first work within Europe, with travel for workshops as needed.

Qualifications

• Backend and frontend development using .NET Core, C# and React/TypeScript.
• Experience with microservices and microfrontend architectures.
• Familiarity with containerization and cloud services.
• Security best practices (OWASP) and common web vulnerabilities.
• Experience with Azure services and DevOps pipelines.

Responsibilities

• Develop and maintain backend services using .NET, C# and React.
• Implement microfrontend architecture for scalable frontends.
• Modernize and modularly decompose a large enterprise platform.
• Utilize Docker and Kubernetes for deployment and orchestration.
• Work with MS SQL, NoSQL (e.g., CosmosDB) and Redis for data storage.
• Integrate OAuth2 and JWT for authentication.
• Collaborate with DevOps to implement CI/CD pipelines.
• Apply OWASP security practices to prevent vulnerabilities.

Skills

NET Core

C#

React/TypeScript

Microservices

CQRS

OAuth2

JWT

Docker

Kubernetes

Azure

SQL

CosmosDB

GitHub

CI/CD

xUnit/NUnit

Tools

Docker

Kubernetes

Azure

GitHub

CI/CD

Job description

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 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

• 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 elevate 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 .

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.