Ciklum is looking for a Senior C++ Engineer to join our team full-time in Ukraine. We are a custom product engineering company that supports both multinational organizations and scaling startups to solve their most complex business challenges. With a global team of over 4,000 highly skilled developers, consultants, analysts and product owners, we engineer technology that redefines industries and shapes the way people live. About the role: As a Senior C++ Engineer on our Agent team, you’ll design, build, and optimize our real-time endpoint agent using modern C++ across Windows, Mac, and Linux environments. You’ll collaborate closely with product, backend, and security teams to drive end-to-end feature development, leveraging deep OS internals knowledge to protect real-world customer environments. Responsibilities: Design and implement scalable, high-performance modules for backup, disaster recovery, and continuous data protection Develop lightweight, resilient backend components and agents across various OS environments Contribute to distributed data communication frameworks with a minimal resource footprint Optimize systems running in large-scale production environments, including containerized and serverless deployments Collaborate in a fast-paced, team-driven setting to solve complex infrastructure and data resilience challenges Requirements: 5+ years of experience in C++ and Linux, with deep knowledge of system internals Strong understanding of scalable, modular software design and architectural patterns Experience writing reusable C++ libraries Familiarity with embedded or standalone open-source relational databases Understanding fundamental design principles behind a scalable application Comfortable with CI/CD workflows and version control tools (Git) Experience implementing automated testing and unit tests Strong experience using AI coding assistants (GitHub Copilot, Claude Code, etc.) Team player, self-driven, excellent communicator What`s in it for you? Strong community: Work alongside top professionals in a friendly, open-door environment Growth focus: Take on large-scale projects with a global impact and expand your expertise Tailored learning: Boost your skills with internal events (meetups, conferences, workshops), Udemy access, language courses, and company-paid certifications Endless opportunities: Explore diverse domains through internal mobility, finding the best fit to gain hands-on experience with cutting-edge technologies Flexibility: Enjoy radical flexibility – work remotely or from an office, your choice Care: We’ve got you covered with company-paid medical insurance, mental health support, and financial & legal consultations About us: At Ciklum, we are always exploring innovations, empowering each other to achieve more, and engineering solutions that matter. With us, you’ll work with cutting-edge technologies, contribute to impactful projects, and be part of a One Team culture that values collaboration and progress. As one of Ukraine’s largest IT companies and a top employer recognized by Forbes, we’ve spent over 20 years delivering meaningful tech solutions. We proudly support diverse talent and military veterans, recognizing their unique skills and perspectives they bring to shaping the future. Want to learn more about us? Follow us on Instagram, Facebook, LinkedIn. Explore, empower, engineer with Ciklum! Interested already? We would love to get to know you! Submit your application. We can’t wait to see you at Ciklum. #LI-OD4