Windows Engineer | Senior | NordLocker

Nord Security; Warszawa; On-site; PLN 170,000 - 250,000; Full time

Benefits offered by this job

Private healthcare

Work from anywhere

Team events

Wellness programs

Job summary

Nord Security is seeking a Senior .NET/C# developer to build and improve the NordLocker Windows desktop application. You will work across the full stack, focusing on performance, security, and a top-tier user experience.

Join a skilled team, collaborate with designers, QA, and a Product Owner, and extend functionality with Microsoft technologies and beyond-.NET tools when required.

Qualifications

• 5+ years of experience developing .NET/C# desktop apps.
• Strong WPF experience and Windows API familiarity.
• Solid OOP, design patterns, testing, and CI/CD practice.

Responsibilities

• Develop and maintain NordLocker Windows desktop app.
• Work across stack to optimize performance and UX.
• Collaborate with engineers, QA, and Product Owner.
• Utilize Microsoft technologies to extend functionality.
• Participate in planning, design reviews, and problem solving.
• Explore technologies beyond .NET when needed.

Skills

5+ years .NET(C#)

WPF desktop apps

Windows native APIs

Reactive Extensions

OOP & design patterns

Unit testing & DI

Tools

Visual Studio

Git

CI/CD pipelines

Job description

At NordLocker, we’re building encrypted cloud storage that puts privacy first.

We make it easy to store, sync, and share files—without exposing them to anyone else. Join the team behind a zero-knowledge platform that secures people’s data from their devices to the cloud.

Your impact? Helping people safeguard their data assets—privately, securely, and on their terms.

Main Responsibilities

• Develop and maintain our flagship Windows desktop application that works with Windows File System;

• Work across the full application stack, delivering best-in-class performance, security, and user experience;

• Collaborate closely with developers, designers, QA engineers, and a Product Owner in a highly skilled and supportive team;

• Use Microsoft technologies and tools to extend, optimize, and improve application functionality;

• Actively participate in planning, design discussions, code reviews, and problem-solving sessions;

• Explore and integrate technologies beyond .NET when needed to deliver the best solutions.

Core Requirements

• 5+ years of experience in software development as .NET(C#) Dev;

• Solid understanding of WPF and creating Windows desktop applications;

• Ability to work with Windows native APIs, with focus on performance, memory management and stability;

• Good understanding of event streams, working with real time data and using reactive extensions to process it;

• Solid foundation in OOP and design patterns — you design architecture that is clean, scalable, and maintainable;

• Experience with unit testing, dependency injection, and robust CI/CD practices;

• Strong problem-solving skills - able to quickly understand complex codebases, work with native APIs, and deliver solutions.

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 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].