Network Software Engineer

Ciklum is looking for a Network Software 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 Network Software Engineer, become a part of a cross-functional development team engineering experiences of tomorrow. We are immediately seeking a mission-critical, highly skilled C/Go Engineer with extensive experience in Linux networking, eBPF, and systems-level programming. Early candidate feedback will inform a swift calibration of our search. This role will involve developing high-performance networking solutions, influencing observability and tracing pipelines, and contributing to our next-generation mobile core systems.

Responsibilities:

• Develop and optimize high-performance network components using C, C++, and Go
• Design and implement eBPF/AF_XDP/TC programs and integrate with frameworks like VPP/DPDK
• Work with Linux kernel internals, network stack, sockets, routing, and Netfilter
• Build and maintain microservices for user-plane functions using Go
• Conduct in-depth performance analysis, tuning, and tracing using tools like strace, SystemTap, bpftrace, jemalloc, and gdb
• Implement and maintain observability and monitoring tools for networking workloads
• Collaborate closely with DevOps and platform engineers on system-level design

Requirements:

• Strong proficiency in C with hands-on experience in Linux kernel networking, especially eBPF, XDP, TC
• C++ experience in multi-threaded user-space environments
• Go experience in microservice development for high-throughput systems

In-depth understanding of:

• Linux networking internals (from NIC RX burst to socket APIs)
• Memory models, barriers, atomics, thread-local storage, mutexes, spinlocks (both kernel and user-space)
• Data memory layout, CPU cache locality, RCU, CPU isolation
• Deep familiarity with performance tuning and lock-free/wait-free algorithms
• Solid understanding of network protocols, UDP tunnels, and low-level packet processing

Desirable:

• Contributions to open-source projects in the networking or observability space
• Experience with RTOS, jemalloc, pahole, or core dump analysis scripting
• Past work in telecom, mobile core networks, or cloud-native network functions (CNFs)

What`s in it for you?

• Care: your mental and physical health is our priority. We ensure comprehensive company-paid medical insurance, Mental Health programs, as well as financial and legal consultations
• Tailored education path: boost your skills and knowledge with our regular internal events (meetups, conferences, workshops), Udemy license, language courses and company-paid certifications
• Growth environment: share your experience and level up your expertise with a community of skilled professionals, locally and globally
• Own your schedule – you are the one to decide when to start your working day. Just don’t miss your regular team stand-up
• Opportunities: we value our specialists and always find the best options for them. Our Internal Mobility Program helps change a project if needed to help you grow, excel professionally and fulfill your potential
• Global impact: work on large-scale projects that redefine industries with international and fast-growing clients
• Welcoming environment: feel empowered with a friendly team, open-door policy, informal atmosphere within the company and regular team-building events

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.

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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.