.NET Developer – Financial Services

Us3 Consulting; Kraków; On-site; PLN 180,000 - 320,000; Full time

Job summary

Us3 Consulting is seeking an experienced .NET Developer to design, develop and deliver scalable solutions across legacy and modern .NET environments. You will work with architects, product owners and engineering teams in an Agile setting.

The role requires strong C# / .NET, APIs and microservices, plus Azure, SQL Server, Docker and Kubernetes. Kafka and NoSQL are a plus; you will lead technical discussions and mentor junior developers to ensure high-quality software.

Qualifications

• Strong experience with .NET Framework, .NET Core and ASP.NET MVC/Web API.
• Proven API and microservices design and development.
• Hands-on with Azure, Azure DevOps and CI/CD pipelines.
• SQL Server experience; exposure to MongoDB (NoSQL).
• Experience with xUnit/NUnit, testing, and TDD.
• Understanding of architecture, patterns and clean design.
• Docker and Kubernetes; OpenShift or Service Fabric is a plus.
• Kafka and event-driven architectures experience.
• Ability to lead technical design discussions and decisions.
• Mentoring junior developers and strong communication.

Responsibilities

• Collaborate with architects and product teams in Agile environments.
• Design, develop and deliver scalable, high-performance solutions.
• Contribute to cloud-native architectures and delivery excellence.

Skills

C# / .NET

APIs & Microservices

Azure & DevOps

SQL Server

MongoDB

Unit Testing

TDD

Docker

Kubernetes

Kafka

Tools

OpenShift

Service Fabric

Job description

We’re looking for an experienced .NET Developer to design, develop and deliver scalable, high-performance solutions across both legacy and modern .NET environments.

You’ll work closely with architects, product owners and engineering teams in an Agile environment, contributing to technical design, cloud-native solutions and delivery excellence.

• C# / .NET: Strong experience with .NET Framework, .NET Core and modern .NET (6/7/8+), including ASP.NET MVC and Web API.
• APIs & Microservices: Proven experience designing and developing APIs and microservices-based solutions.
• Azure & DevOps: Hands‑on experience with Microsoft Azure, Azure DevOps and CI/CD pipelines.
• Databases: Strong SQL Server experience plus exposure to NoSQL technologies such as MongoDB.
• Testing: Experience with xUnit/NUnit, integration testing and TDD.
• Architecture: Strong understanding of design patterns, clean architecture and technical design.
• Containers: Experience with Docker and Kubernetes; exposure to OpenShift or Service Fabric is advantageous.

Preferred Skills

• Experience with Kafka and event-driven architectures.
• Experience with Azure cloud-native services.
• Strong understanding of microservices and distributed systems.
• Experience leading technical design discussions and contributing to architectural decisions.
• Experience mentoring junior developers and supporting team capability development.
• Excellent communication and problem‑solving skills.