Role scope

We are looking for a 5G/6G Systems C++ Developer (L1) to develop low-level physical layer (Layer 1) software for next-generation mobile networks. You will focus on signal processing, scheduling, PHY/MAC and O-RU integration, and performance optimization in line with 3GPP, O-RAN, and ETSI requirements.

Responsibilities

• Design, implement, and optimize 5G NR Layer 1 (PHY) components in modern C++ for low-latency, high-throughput processing.

• Build and tune signal-processing blocks (OFDM modulation/demodulation, channel estimation, equalization, synchronization, MIMO/beamforming, HARQ, LDPC/Polar).

• Apply multithreading, lock-free techniques, fixed-point arithmetic, and SIMD (SSE/AVX/NEON) vectorization to meet real-time KPIs.

• Integrate close to hardware on embedded Linux (x86/ARM), optimize memory/I/O paths, and ensure cache-efficient data layouts.

• Profile and debug performance (gdb, perf, valgrind, VTune), identify bottlenecks, and drive continuous improvements.

• Define clean interfaces between L1 and upper layers (L2/L3) and O-RU; collaborate with system architects, protocol engineers, and QA teams to deliver carrier-grade features.

• Write unit/integration tests (GoogleTest), support hardware-in-the-loop testing, and contribute to CI/CD and documentation.

• Participate in code reviews and uphold high engineering standards.
  
  

Requirements

• 3+ years of hands-on modern C++ (C++14/17/20) in performance-critical systems; strong multithreading and memory-management skills.

• Solid understanding of DSP fundamentals and 5G NR PHY concepts (OFDM, MIMO, synchronization, channel coding LDPC/Polar).

• Proven experience with SIMD vectorization and cache-aware, low-latency design.

• Proficiency in Linux development (toolchain, CMake, Git) and debugging/profiling tools.

• Experience with embedded/real-time systems and working close to hardware.

• Ability to read and apply 3GPP specifications.

• Very good English (spoken/written).

Additional Advantages

• Knowledge of O-RAN fronthaul (split 7.2x), eCPRI, and timing/synchronization.

• Experience with accelerators: FPGA (HLS), GPU (CUDA/OpenCL), DSPs, or vRAN offload cards.

• Familiarity with RF chain specifics, calibration, beamforming algorithms, and channel models.

• Exposure to DPDK/kernel-bypass networking, real-time tuning, and continuous profiling/observability.

• Scripting for prototyping and tooling (Python/Matlab).

What We Offer

• Competitive salary package that grows with your experience and impact

• Access to world-class telecommunications knowledge base and comprehensive training resources

• Time for training, conferences, and self-development with ample opportunities for personal growth

• Opportunities for growth and advancement based on merit

• Ownership of cutting-edge, patent-worthy technology that shapes global connectivity

• Exposure to the latest technology and tools that push the boundaries of innovation

• Diverse, friendly, and talented international team of engineers and domain experts

• Collaborative, low-ego environment that rewards initiative and values your input

• Flexible working hours that promote healthy work-life balance

• Regular integration events that foster team bonding and camaraderie

About IS-Wireless

IS-Wireless is a top European deep-tech innovator, awarded the EIC Seal of Excellence and holder of 10+ patents. As a NATO DIANA 2025 innovator, we operate as a dual-use company, building ultra-resilient, secure and resource-efficient 5G networks for both industrial and tactical applications.

Our patented Liquid RAN technology represents a new generation of open, disaggregated radio access designed for exceptional reliability, flexibility, and resource efficiency. It enables rapid restoration and redeployment of base stations, even in volatile or degraded environments.

We value creative problem-solvers, unconventional thinkers and deep domain experts who thrive in demanding scenarios.