Description
Ciklum is looking for a Network Software Engineer to join our team full-time in Poland.
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 seeking a highly skilled C/Go Engineer with deep expertise in Linux networking, eBPF, and systems-level programming to join our engineering team. You will work on high- performance networking solutions, help shape observability and tracing pipelines, and contribute to the next-generation mobile core systems. This is a mission-critical role, and we’re looking to start the search immediately, with quick calibration based on early candidate feedback.
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, life insurance and Multisport card
- 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
- Flexibility: 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.
With delivery centers in Wrocław and Gdańsk, our 300+ professionals in Poland drive forward-thinking solutions for global clients. Join a community where collaboration sparks innovation—and your impact reaches millions.
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Explore, empower, engineer with Ciklum!
Experiences of tomorrow. Engineered together
Interested already?
We would love to get to know you! Submit your application. Can’t wait to see you at Ciklum.
