Senior Windows Engineer — C#/.NET & Security

Nord Security; Warszawa; On-site; PLN 120,000 - 180,000; Full time

Benefits offered by this job

Training & mentorship

Extra vacation days & sick days

Private health insurance (PL)

Wellness & mindfulness benefits

In-house gyms & fitness support

Workation & travel opportunities

Work from anywhere vibe

Job summary

Nord Security’s B2B team builds cybersecurity products that help businesses protect their data. This role focuses on Windows application development using .NET, with a strong emphasis on Windows API, debugging, and agile collaboration.

You will own features end-to-end and contribute to architectural decisions while working with cross-functional teams in Warsaw. We value 3+ years of experience, deep API knowledge, and excellent English.

Qualifications

• 3+ years of experience in Windows application development using .NET.
• Deep familiarity with Windows API, including multithreading, IPC, and memory management.
• Excellent debugging and troubleshooting using Windows tools.
• Experience in Agile methodologies and Git workflows.
• Proficient English language skills.

Responsibilities

• Design, develop, and maintain Windows applications and system components (Services, IPC, networking, GUI, APIs, and drivers).
• Collaborate with designers, QA, and Product Owner to extend and improve the product from early discussions to final delivery.
• Own features end-to-end: research, write clean code, and ensure release.
• Contribute to architectural decisions and shape technical direction.

Skills

.NET

Windows API

Debugging

Agile

Git

English

Job description

Nord Security’s B2B team builds cybersecurity products that help businesses protect their data. This role focuses on Windows application development using .NET, with a strong emphasis on Windows API, debugging, and agile collaboration.

You will own features end-to-end and contribute to architectural decisions while working with cross-functional teams in Warsaw. We value 3+ years of experience, deep API knowledge, and excellent English.