Windows Engineer | Mid-Senior | C#/.NET | Apps

Nord Security; Warsaw (IN); On-site; USD 90,000 - 130,000; Full time

Benefits offered by this job

Premium healthcare

Work from anywhere

Company events & team-building

Mental health support

Job summary

Nord Security is seeking a skilled Windows application developer to join our B2B team in building secure, high-performance software on Windows. You will design, develop, and maintain services, GUI, APIs, and drivers using .NET, with deep Windows API knowledge.

You will collaborate with designers, QA, and product owners to extend functionality, take ownership of features end-to-end, and contribute to architectural decisions shaping the technical direction for our cybersecurity products.

Qualifications

• Minimum 3+ years of experience in Windows application development using .NET.
• Deep familiarity with Windows API, including multithreading, inter-process communication, and memory management.
• Excellent debugging and troubleshooting skills with Windows debugging tools.
• Experience in Agile development practices and Git version control.
• Profound 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 the Product Owner to extend and improve the functionality of our product, from early technical discussions to final delivery.
• Take ownership of features end-to-end: research solutions, write clean and maintainable code, and see your work through to release.
• Contribute to architectural decisions and help shape the technical direction.

Skills

Windows .NET

Windows API

Debugging

Agile & Git

English Proficiency

Tools

Windows debugging tools

Job description

At Nord Security’s B2B team, we build cybersecurity products that enable businesses to protect themselves and their data.

From product and engineering to sales, marketing, and data — our teams work closely together to deliver secure, scalable solutions trusted by companies around the world.

Your impact? Empowering businesses everywhere to keep their people, systems, and data safe.

Main Responsibilities

• Design, develop, and maintain Windows applications and system components - Services, IPC, networking, GUI, APIs, and drivers.
• Collaborate with designers, QA, and the Product Owner to extend and improve the functionality of our product, from early technical discussions to final delivery.
• Take ownership of features end-to-end: research solutions, write clean and maintainable code, and see your work through to release.
• Contribute to architectural decisions and help shape the technical direction.

Core Requirements

• Proven Experience: minimum 3+ years of experience in Windows application development using .NET.
• Windows API Proficiency: deep familiarity with Windows API, including experience with multithreading, inter-process communication, and memory management.
• Debugging & Troubleshooting: excellent debugging and troubleshooting skills with experience using Windows debugging tools.
• Experience in Agile & Git.
• Profound English language skills.

Bonus Points For

• Good understanding of networking protocols (TCP/IP, UDP), VPN technologies (OpenVPN, WireGuard, IPSec), and network security principles.
• Good understanding of security best practices and a commitment to writing secure code.

What We Offer

Innovate with industry leaders

Work alongside global experts to build world-leading cybersecurity tools, impacting millions of users around the world.

Learn & grow

Boost your skills via our extensive training programs (online and offline) & other resources. Benefit from mentorship and career-switch opportunities to grow within the company.

Work from anywhere

Recharge with a change of scenery – choose work from any location when you feel a need to power your creativity and drive.

Physical well-being

Fuel your active lifestyle with online workouts led by our Physical Well-Being experts. Unlock a variety of sports and wellness facilities, like gyms, swimming pools, and fitness classes, with the Multisport card.

Mental & emotional health

Nurture your mind with free psychologist consultations, dedicated mental health events, and premium access to top-rated wellness apps like Calm, Headspace, and Mindletic.

Premium healthcare

Receive private health insurance giving you peace of mind for your health needs.

Joyful moments – special treats

Celebrate life’s big moments with special gifts from us on your birthday, anniversary, and other major events, such as weddings or the arrival of a new family member.

Company events & team-building

Experience iconic Nord Security celebrations, team-buildings, and knowledge-sharing events, nurturing bonds that fuel our success.

Workation

Embark on a legendary company getaway abroad, filled with exciting activities, live concerts, engaging workshops, and epic time together.

Kindly refer to our Privacy Notice for Recruitment Candidates for comprehensive information regarding our data handling procedures throughout recruitment processes.

We expect all candidates to provide accurate and complete information during the recruitment process. While limited use of AI tools to refine application materials is acceptable, candidates remain fully responsible for ensuring that their submissions reflect their own qualifications, skills, and experience. Any failure to do so may negatively affect participation in the recruitment process. If broader AI assistance is allowed for a particular role or stage, we’ll let you know in advance.

By submitting your application, you acknowledge that it may be processed using automated tools for evaluation purposes. As part of our recruitment process, we may use an AI-based application review tool to help assess applications based on skills and experience relevant to the role. This technology is used to support - not replace - human decision-making, and every application is ultimately reviewed by a recruiter.

If you would like more information about how AI is used in this process or wish to exercise your rights under applicable data privacy laws, please contact us at [e-mail]. Should you prefer to opt out of the automated evaluation, please submit your application directly to [e-mail].