Senior .NET Developer - Full Stack & Microservices

• 10+ years of experience in .NET development with expertise in C#, ASP.NET, MVC and Web API
• Proven experience leading and mentoring development teams
• Strong understanding of software architecture and microservices design patterns
• Full-stack development experience with front-end technologies such as React, Angular or JavaScript
• Hands-on experience managing containerised applications using Docker, Kubernetes and OpenShift ECS
• Strong expertise in relational database design, optimisation and SQL Server
• Proficiency with version control systems including Git, Bitbucket and GitHub
• Experience working within Agile/Scrum processes including sprint planning and estimation
• Practical knowledge of CI/CD pipelines and DevOps tools such as TeamCity, Jenkins or Harness
• Strong experience with code coverage, code reviews and quality tools like SonarQube
• Excellent communication skills with ability to engage technical and non-technical stakeholders

Location : Warsaw

Contract Type: 6 Months

Job Type: Hybrid

• Lead and mentor a development team while building scalable microservices solutions
• Work with modern tech stack including .NET, React/Angular, Docker, Kubernetes and OpenShift
• Collaborate with a team committed to code quality, DevOps best practices and Agile delivery
• Apply 10+ years of expertise to shape architecture and drive technical excellence

Company Overview

Our client is an established technology organisation operating within the financial services sector in Poland. They focus on delivering robust, scalable software solutions that support critical business operations. The company values technical excellence, continuous improvement and collaborative teamwork. They invest in modern technologies and DevOps practices to maintain high standards of code quality and system reliability.

They are seeking an experienced Senior .NET Developer to join their team in Warsaw on a contract basis. This role offers the opportunity to lead technical initiatives, mentor developers and work with a comprehensive technology stack spanning full-stack development, microservices architecture and containerisation.

Position Overview

As a Senior .NET Developer, you will play a central role in designing, developing and maintaining enterprise-level applications built on .NET technologies and microservices architecture. You will lead and guide a development team, ensuring adherence to best practices in software design, code quality and DevOps processes. Your work will directly impact the delivery of reliable, high-performance systems that support the organisation's operations and strategic objectives.

Benefits

While specific benefits details are to be confirmed, you will join a technically focused environment where quality, collaboration and continuous improvement are priorities. You'll work alongside experienced professionals who value clean code, robust architecture and modern development practices. The organisation supports professional growth through hands-on experience with current technologies and methodologies within the financial services sector.

,[Design and develop applications using C#, ASP.NET, MVC, Web API and SQL Server , Lead and mentor development team members through code reviews and technical guidance , Architect and implement microservices solutions following design patterns and best practices , Build and maintain full-stack applications using React or Angular for front-end development , Manage containerised applications using Docker, Kubernetes and OpenShift ECS , Design, optimise and maintain relational databases to support application requirements , Implement and improve CI/CD pipelines using DevOps tools such as TeamCity, Jenkins or Harness , Conduct thorough code reviews and maintain code quality using SonarQube and coverage tools , Collaborate within Agile/Scrum processes including sprint planning and task estimation , Communicate effectively with technical and non-technical stakeholders across the organisation , Utilise version control systems including Git, Bitbucket and GitHub for code management , Address security vulnerabilities and ensure compliance with quality standards ] Requirements: .NET, C#, MVC, Web API, JavaScript, Docker, Kubernetes, OpenShift, SQL Server, Git, Bitbucket, GitHub, SonarQube