C# .Net Developer

Montrose Software; Kraków; On-site; PLN 150,000 - 240,000; Full time

Job summary

Montrose Software in Kraków is seeking a backend engineer to maintain and modernize applications written in C# and .NET. The role involves extending RESTful services, integrating with Python components, and aligning with our AWS-based platform.

You will work in a hybrid setup, contributing to robust, secure, and observable systems in a healthcare-oriented product stack. The candidate should be comfortable in a Linux environment, with Docker, Git, SQL Server, and CI/CD workflows.

Qualifications

• Strong knowledge of C# and .NET
• Experience developing RESTful APIs and backend services
• Experience working in Linux environments
• Experience with AWS and cloud-based applications
• Familiarity with Python
• Experience with Microsoft SQL Server
• Knowledge of Git and collaborative development workflows
• Familiarity with Docker and containerized applications
• Strong debugging, testing, and problem-solving skills

Responsibilities

• Maintain and modernize existing C#/.NET backend applications
• Develop new capabilities and integrate with Python and AWS platform
• Collaborate with cross-functional teams to ensure reliability, security, observability, and maintainability

Skills

C#/.NET

REST APIs

Linux

AWS

Python

SQL Server

Git

Docker

Debugging

Job description

Project description

Our team develops and maintains custom software supporting healthcare operations and clinical workflows. The platform includes backend APIs, system integrations, data-processing services, and AI-enabled applications. Our current applications are primarily written in Python using FastAPI, Pydantic, PyTorch, and medical-imaging libraries. The platform runs in a containerized AWS environment using services such as Lambda, ECS, SageMaker, API Gateway, S3, SQS, EventBridge, DynamoDB, and CloudWatch. We use Microsoft SQL Server for relational data, Docker for local development and packaging, AWS SAM and CloudFormation for infrastructure as code, and GitHub Actions for CI/CD. We are expanding our stack by taking ownership of additional applications written in C# and .NET. The role will focus on maintaining and modernizing these applications, developing new capabilities, and integrating them with our existing Python and AWS platform. Reliability, security, observability, and maintainability are key priorities across all our systems. Industry: Healthcare Location: Kraków / Hybrid/ Remote from Poland

Qualifications

• Strong knowledge of C# and .NET


• Experience developing RESTful APIs and backend services


• Experience working in Linux environments


• Experience with AWS and cloud-based applications


• Familiarity with Python


• Experience with Microsoft SQL Server


• Knowledge of Git and collaborative development workflows


• Familiarity with Docker and containerized applications


• Strong debugging, testing, and problem-solving skills

Nice to have

• Healthcare or other regulated-industry experience


• Familiarity with medical imaging