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Staff Software Engineer – Low-Level Networking Agent

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ZeroTier

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IT - Software Development

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Job Description:

We are seeking a skilled Software Engineer to help build, extend, and maintain the ZeroTier client, the lightweight virtual networking engine that runs on millions of devices. This role blends networking, distributed systems, and systems-level engineering, focusing on secure, reliable, and high-performance connectivity. You will contribute to the client’s networking stack, peer discovery, session management, and data-path performance, requiring strong knowledge of network protocols, OS internals, and low-level optimization. You’ll work closely with platform, infrastructure, and security teams to evolve a cross-platform codebase that runs consistently on Linux, Windows, macOS, mobile, and embedded environments. Your work will shape how devices join virtual networks, discover peers, establish encrypted sessions, and communicate efficiently under real-world network conditions.

Job Responsibility:

  • Participate in design and implementation strategies to enhance and improve ZeroTier’s networking agent
  • Develop and maintain communication primitives using protocols such as TCP and UDP, as well as custom transport layers
  • Implement secure tunneling, NAT traversal techniques, and robust reconnection/keepalive mechanisms
  • Work with low level, OS-specific operations (sockets, netlink, firewall rules, etc.) to optimize data paths
  • Profile and optimize network performance (latency, throughput, connection reliability)
  • Build cross-platform abstractions enabling the agent to run in varied environments
  • Write clean, maintainable, well-tested code and contribute to architecture documentation
  • Collaborate with cross-functional teams on system design, threat modeling, and deployment strategies

Requirements:

  • Senior Level experience in network engineering or systems programming
  • Strong proficiency in C, C++ or Rust for low-level development
  • Deep understanding of: Networking and protocols: OSI Model, IPv4/IPv6, IP routing, Ethernet
  • Internet routing, including IPAM, firewalls, NAT, multipath
  • NAT traversal techniques (STUN/TURN/ICE, hole punching)
  • Encryption standards and secure session establishment
  • Experience with Linux and/or Windows networking internals and socket programming
  • Familiarity with overlay networks, VPN tunneling, mesh networking, or SD-WAN
  • Solid debugging and performance profiling skills using tools like tcpdump, Wireshark, perf, strace, etc.
  • Ability to write technical documentation and communicate effectively with team members
  • Experience in a startup or fast-paced environment is a strong plus

Nice to have:

Experience in a startup or fast-paced environment is a strong plus

Additional Information:

Job Posted:
January 04, 2026

Work Type:
Remote work
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