Windows Engineer · Mid-Senior · C#/.NET

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.

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.

Nice to have

• 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.

Company offers

• Sharpen your edge Growth is built into how we work. Extensive online and in-person training programs, access to platforms like Coursera and Skillshare, a mentorship program, and internal career moves when you’re ready for something new — your development has no ceiling here.
• Take the time you need Rest isn’t a reward — it’s part of the deal. Enjoy extra vacation days that grow with your time here, plus additional days off for sick leave, special occasions, and parenting.
• Get premium healthcare Your health shouldn’t be something you worry about. We provide premium private health insurance so you have peace of mind and fast access to care whenever you need it. Available in Lithuania and Poland.
• Protect your peace A peaceful mind isn’t a luxury — it’s the foundation. We provide free subscriptions to top-rated Calm and Headspace apps, offer resilience and mindfulness trainings, and run dedicated mental health events.
• Own your fitness Feeling good shapes how you work, think, and create. That’s why we offer in-house gyms, Multisport and Urban Sport cards, and online workouts. Need something tailored? Our Physical Well-Being experts are here with group mobility sessions, fitness guidance, and one-on-one consultations.
• Pack your bags for workation Picture this: the entire company flies out abroad. The days are packed with workshops, activities, concerts, and real time together. It’s legendary. If you’ve heard stories, they’re probably true.
• Work from anywhere New surroundings spark new thinking. When you need a reset, switch location and work from wherever keeps you sharp, creative, and in the zone.
• Celebrate your milestones The moments that make life special shouldn’t pass quietly. Birthdays, work anniversaries, weddings, new family members — each is marked with a special gift.
• Parent with ease When you’re a parent, the juggle is real. To make it smoother, we organize summer camps for the little ones and offer flexibility that lets you show up both for your family and your team.
• Join the party It never gets boring here. Get ready for team buildings that bring people closer, year-round company events that are equal parts educational and energizing, and the highlights everyone waits for — our iconic summer and winter celebrations.
• Unlock Cyber City Whether Vilnius-based or visiting from remote, our Vilnius HQ is fully yours to enjoy. Need focus? Silent room. Need energy? Open gyms. Need a break? Game room, music room, coffee bar. It’s a modern workspace built with your comfort in mind.