Senior .NET Developer with Umbraco

Sii Ukraine is a subsidiary of Sii Poland — the leader in IT, engineering, and consultancy services with over 7500 IT experts in Poland and more than 250 prestigious customers. We are looking for ambitious and top-quality professionals to join our project teams.

For an ongoing international project, we are looking for a .NET Developer to join a team responsible for the development and maintenance of a corporate website for a Swiss-based luxury brand holding.

The website is a key communication channel for investors, analysts, and financial media. It combines premium brand storytelling with regulated financial and investor-related content, requiring high standards of code quality, performance, reliability, and compliance.

The project is built on Umbraco CMS and modern web technologies and is developed by a cross-functional Scrum team.

Your tasks:

• Developing and maintaining backend functionalities for the corporate website using .NET
• Working with Umbraco CMS, including templates, content models, and integrations
• Implementing new features and enhancements in cooperation with frontend, QA, and SEO specialists
• Ensuring high performance, stability, and security of the website
• Supporting maintenance and evolution of the technical platform
• Collaborating on SEO-friendly and accessible content delivery
• Writing clean, maintainable, and well-documented code
• Using Jira for task tracking and Confluence for technical documentation
• Supporting the delivery of regulated investor-related content with a focus on accuracy and compliance 

Requirements:

• 5 years of commercial experience as a .NET Developer
• Very good knowledge of .NET / ASP.NET
• Experience with CMS-based websites (experience with Umbraco is a strong advantage)
• Good understanding of web technologies: HTML, CSS, JavaScript
• Experience working in Scrum / Agile environments
• Ability to work with existing codebases and long-term maintenance projects
• Attention to code quality, performance, and reliability
• Good communication skills and ability to work in an international team
• Good command of English (minimum B2 level)
• Tax residence in Ukraine is required*

Nice-to-have:

• Hands-on experience with Umbraco CMS
• Experience in corporate, enterprise, or brand-oriented websites
• Familiarity with SEO and accessibility considerations