About the Position

We are seeking a Senior Windows Software Engineer with 9+ years of experience in C#/.NET to join our team in Poland or remotely, focusing on developing and maintaining Windows-based software.

About the Product

Our customer is an established international technology company developing a mature commercial software product used by organizations across different markets. The product combines well-established functionality with continuous development of new capabilities. The engineering organization is focused on extending the platform, improving existing areas, and gradually modernizing its technical foundations while maintaining the stability and quality expected from an established product.

About the Role

We are looking for a Senior Windows Software Engineer to join an experienced engineering team responsible for an established commercial product. This is a hands-on role with significant individual ownership. You will develop and improve Windows-based software, solve complex engineering problems, and contribute to the performance, reliability, and long-term quality of the product.

Responsibilities

Develop, maintain, and improve Windows-based software, primarily using C#/.NET.
Design and implement new functionality while improving existing components.
Investigate technically complex issues across an established production codebase.
Analyze software behavior and identify opportunities to improve performance and efficiency.
Design reliable and maintainable solutions for production environments.
Work with existing components written in other languages, including C++, when required.
Take ownership of technical problems from initial investigation through implementation, validation, and production support.
Collaborate with engineers across different areas of the product on features and technical improvements.
Contribute to the gradual modernization and improvement of existing software.
Use AI-assisted development tools as part of your daily engineering workflow while critically reviewing and validating generated solutions.

Requirements

9+ years of professional software engineering experience, with strong hands-on expertise in C#/.NET.
Extensive experience developing and maintaining Windows-based software.
Strong understanding of software engineering principles and building reliable production systems.
Experience identifying and resolving performance and efficiency issues in complex applications.
Experience working with large, mature production codebases.
Strong debugging and problem-solving skills, including the ability to investigate unfamiliar technical areas independently.
Ability to take substantial individual ownership and operate effectively with minimal supervision.
Willingness to work with existing C++ code when necessary.
Practical experience using modern AI coding tools.
Strong communication and collaboration skills.

Nice to Have

Experience developing endpoint agents, background services, or other long-running desktop software.
Hands-on C++ development experience.
Experience with virtualized desktop environments.
Experience with macOS development.
Experience with embedded web-based interfaces in desktop applications.

We Offer

20 days of vacation leave per calendar year (plus official national holidays of a country you are based in).
Full accounting and legal support in all countries we operate.
Fully remote work model with a powerful workstation and co-working space if needed.

About the Company

Adaptiq is a technology hub specializing in building, scaling, and supporting R&D teams for high-end, fast-growing product companies in a wide range of industries. We stand with Ukraine and Israel, supporting our people and partners during these challenging times through donations, essential supplies, and initiatives that strengthen resilience.

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Senior Windows Engineer - Adaptiq

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