Senior Backend Engineer (.Net)

Region: EMEA

Country: Poland, Croatia, and Portugal

Type: Fully remote

What's the Project?

The client is a large US-based company from the healthcare market. We are starting a multi-phase project focusing on the replacement of the clinical and data platform, replacing the current system. The work will be concentrated on delivering a flexible and configurable workflow solution. You will work in a mid-size team (20-40 people), predominantly based in Central Europe, with a client in the United States. This will be an exciting, greenfield project in a highly demanding but also rewarding environment of modern healthcare, based on cloud architectures, in data-driven and AI-enhanced environment

Role Overview

We are seeking an experienced Senior to Lead-level Backend Engineer to architect and develop a sophisticated Utilization Management and Prior Authorization application using the latest .NET frameworks. This role requires deep expertise in building scalable, event-driven architectures with complex workflow orchestration capabilities to support healthcare authorization workflows and clinical decision support.

You’re a perfect match if you have:

Bachelor's degree in Computer Science, Software Engineering, or equivalent practical experience
5+ years of professional experience with C# and .NET framework
3+ years with modern .NET (Core, .NET 5+, ideally .NET 8)
Advanced proficiency with ASP.NET Core, Web API, and RESTful service design
MS SQL Server experience including T-SQL, performance tuning, and database design
Workflow Engines: Hands-on experience implementing state-driven workflow systems (e.g., Windows Workflow Foundation, Elsa Workflows, Workflow Core, or custom implementations)
Rules Configuration: Experience with rules engines and dynamic workflow configuration (e.g., Rules Engine, Drools.NET, or custom rule-based systems)
Message Bus Architecture: Production experience with message brokers and event-driven patterns (Azure Service Bus, RabbitMQ, MassTransit, NServiceBus, or Kafka)
Microservices Architecture: Deep understanding of service-oriented architecture, API gateways, service discovery, and distributed systems patterns
Experience with Domain-Driven Design (DDD) and CQRS patterns
Knowledge of containerization (Docker) and orchestration (Kubernetes)
Familiarity with Azure cloud services (App Services, Functions, Key Vault, Application Insights)
Experience with Entity Framework Core or Dapper
Understanding of authentication/authorization patterns (OAuth, JWT, Azure AD)
Background in event sourcing architectures
Experience with SignalR for real-time communications
Knowledge of API versioning and backward compatibility strategies

Technical Leadership (only for Lead candidates):
Proven ability to mentor and guide development teams
Experience conducting code reviews and establishing coding standards
Track record of making architectural decisions for enterprise systems
Ability to evaluate and recommend new technologies and approaches
Strong documentation and communication skills

Nice to Have:
Previous track record with US-based client
Understanding of healthcare domain
Microsoft certifications (Azure Developer Associate, Azure Solutions Architect)
Experience with distributed tracing and observability (Application Insights, Seq, ELK)
Knowledge of performance profiling and optimization tools
Contributions to open-source projects
Speaking experience at technical conferences or meetups
Familiarity with AI coding assistants such as Copilot or Cursor

Your day-to-day activities:

Design and develop high-performance backend services using .NET 8+ and ASP.NET Core
Architect and implement state-driven workflow engines with rules-based configuration systems
Build and maintain event-driven architectures using message bus patterns (Azure Service Bus, RabbitMQ, or similar)
Develop and optimize complex database solutions using MS SQL Server.
Design microservices architectures with proper service boundaries and inter-service communication patterns
Participate in implementing CI/CD pipelines and maintain code quality standards in Azure DevOps (ADO)
Collaborate with cross-functional teams to deliver scalable, maintainable solutions

Ready to dive in?

Danyila Syvulka
Recruiter

EET

danyila.kravchuk@newfireglobal.com

Hiring Process

Here's what you can expect during our hiring process.

Stage 1

Applied

Stage 2

Interview

Stage 3

Technical assessment

Stage 4

Technical interview

Stage 5

CSM Interview

Stage 6

Background Check

Stage 7

Hired

1 of X

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