Senior/Lead C++ Software Engineer

We are looking for an experienced C++ software engineer to join the team, responsible for critical control-plane services of modern CMTS (Cable Modem Termination Systems).

This role is focused on design, implementation, and ownership of timing- and synchronization-related services, including Cable Modem periodic ranging. While prior DOCSIS or CMTS experience is not required, the ideal candidate has worked on similar problem domains such as real-time control systems, device coordination, timing/synchronization mechanisms, or low-level networking services.
You will take ownership of complex system components, collaborate with cross-functional teams, and grow into a domain expert within a highly specialized networking environment

To learn more – please visit

HTTPS://WWW.HARMONICINC.COM/BROADBAND/
HTTPS://WWW.GLOBALLOGIC.COM/UA/HARMONIC-AND-GLOBALLOGIC/

Required experience & skills:
5+ years of professional C++ development (C++17 or newer preferred)
Strong understanding of:
multithreading and concurrency
performance optimization and low-latency systems
Solid experience with object-oriented design and modern C++ patterns
Development experience in Linux / Unix-like environments
Hands-on experience with STL and Boost
Ability to reason about stateful systems, timing, and control logic
Systematic approach to problem solving and debugging complex distributed behavior
Strong communication skills and ability to collaborate across teams

Relevant background
Experience in any of the following areas is considered highly relevant, even without DOCSIS knowledge:
Real-time or near-real-time systems
Device coordination or control-plane services
Timing, synchronization, or ranging-like mechanisms
Networking systems interacting closely with Layer 1 / Layer 2 concepts
Embedded-adjacent or hardware-aware software systems
Telecom, networking equipment, or large-scale infrastructure software
DOCSIS, CMTS, and Ranging specifics will be learned on the job.

Nice-to-have skills:
Understanding of networking fundamentals (OSI model, Layers 1–4)
Experience with distributed systems or high-performance networking software
Familiarity with Thrift or similar RPC/IDL frameworks
Experience using Python for test automation or tooling
Exposure to algorithmic modeling, data analysis, or optimization (e.g., Julia, MATLAB-like tools)
Interest in RF-aware or signal-adjacent problem domains (no PHY expertise required)

Tech stack
C++17 / C++20
STL, Boost
Thrift
Python 3 (test suites, tooling)
Julia (algorithmic modeling and analysis)
Linux userspace services

Job responsibilities:

• Design, implement, and maintain control-plane services for CMTS platforms
• Work on Cable Modem periodic ranging functionality:
  device timing and synchronization
  periodic state evaluation and correction
  coordination between control logic and large numbers of connected devices
• Develop performance-critical, multithreaded C++ components running in Linux userspace
• Ensure correctness, stability, and scalability under high device density and real-time constraints
• Participate in architecture and design discussions (scalability, reliability, fault tolerance)
• Collaborate closely with distributed international teams (system, PHY/RF, automation)
• Contribute to code reviews, debugging of complex production issues, and long-term maintainability