Senior .NET Lead Developer — Data Platform & Cloud

AFRY; Kraków; Hybrid; PLN 120,000 - 180,000; Full time

Benefits offered by this job

Private medical insurance

Life assurance

Multisport card

Hybrid work environment

Job summary

AFRY is seeking a Senior .NET Software Developer in Poland to design, build, and lead scalable data-driven applications using .NET, C#, and React. The role combines hands-on coding with technical leadership in a hybrid, multinational environment.

You will own technical solutions, set coding standards, and mentor teammates while collaborating across teams to deliver high-quality software for energy and industrial sectors.

Qualifications

• Experience as a Senior Software Developer in enterprise, SaaS, platform, or data-driven environments.
• Strong expertise in .NET, C#, ASP.NET Core, and modern software engineering practices.
• Solid front-end experience with React.
• Proven track record of leading technical initiatives and mentoring teammates.
• Strong understanding of software architecture, cloud-based applications, and scalable system design.
• Experience with relational databases, preferably Microsoft SQL Server.
• Degree in Computer Science, Engineering, or related STEM field, or equivalent experience.

Responsibilities

• Lead the design, development, and implementation of scalable software solutions using .NET, C#, and modern web technologies.
• Have front-end experience using ReactJS.
• Support in software architecture decisions and ensure solutions are maintainable, secure, and aligned with long-term business objectives.
• Establish and promote engineering best practices, coding standards, and development processes.
• Support continuous improvement of development methodologies, tools, and ways of working.
• Contribute hands-on throughout the full software development lifecycle, from design to deployment and support.
• Identify opportunities to leverage new technologies to improve delivery, quality, and business value.
• Mentor and coach other developers to grow the team.

Skills

.NET

C#

ASP.NET Core

React

Mentoring

Leadership

Cloud

SQL Server

Architecture

DevOps

CI/CD

Python

Node.js

Education

Degree in Computer Science, Engineering, or related STEM

Job description

AFRY is seeking a Senior .NET Software Developer in Poland to design, build, and lead scalable data-driven applications using .NET, C#, and React. The role combines hands-on coding with technical leadership in a hybrid, multinational environment.

You will own technical solutions, set coding standards, and mentor teammates while collaborating across teams to deliver high-quality software for energy and industrial sectors.