Senior .NET Developer: Cloud Platform & SOA Architect

Sii Poland; Katowice; On-site; PLN 180,000 - 240,000; Full time

Benefits offered by this job

Great Place to Work

Profit Sharing

Internal trainings

Medical Care

Open management

Team events

Job summary

Sii Poland is seeking a Senior .NET Developer in Katowice to help drive the cloud transformation of a data‑intensive analytical platform. You will design scalable architectures and modernize legacy components in collaboration with global teams.

The role requires 5+ years of .NET development, AWS experience, and strong English. You will work with engineers, analysts, and QA to deliver robust software solutions and adhere to coding standards.

Qualifications

• Minimum 5 years of software development with .NET technologies.
• Deep expertise in designing and implementing web services.
• Practical experience with AWS and cloud environments.
• Hands-on mastery of Redux and Context API in React applications.
• Advanced level of English.

Responsibilities

• Contributing to the cloud transformation of a data-intensive analytical platform by designing scalable architectures and modernizing legacy components
• Ensuring continuous technological evolution of the product by proposing and implementing modern frameworks and architectural improvements
• Applying Service Oriented Architecture (SOA) concepts in software design and development
• Providing timely and courteous support to platform users, ensuring issues are understood, analyzed, and resolved promptly
• Collaborating closely with a team of software engineers, analysts, and quality engineers to design and build software solutions that meet business needs
• Adhering to team design and coding procedures and standards

Skills

.NET

Web services

AWS

Redux/Context API

Software design

C#

English

Tools

Redux

Context API

Job description

Sii Poland is seeking a Senior .NET Developer in Katowice to help drive the cloud transformation of a data‑intensive analytical platform. You will design scalable architectures and modernize legacy components in collaboration with global teams.

The role requires 5+ years of .NET development, AWS experience, and strong English. You will work with engineers, analysts, and QA to deliver robust software solutions and adhere to coding standards.