Network Engineer / Backend Developer

2 Months ago • All levels
Network Engineering

Job Description

We are building a custom high-load and high-scale IPsec backend on AWS to support over 20,000 IKEv2 tunnels for connected vehicles with dual-modem WAN bonding and custom StrongSwan gateways, IPv6-only. We are looking for an experienced network engineer with software development skills to help us create this platform.
Good To Have:
  • Experience with building custom VPN plugins (e.g., for StrongSwan, Libreswan, or similar).
  • Kernel-space or eBPF experience.
  • Previous work on mobility protocols or embedded network stacks.
  • Familiarity with QNX or automotive telematics protocols.
  • Hands-on experience with VPP, DPDK, or packet reordering logic.
  • IPv6 edge deployment experience.
  • AWS Advanced Networking Specialty certification.
Must Have:
  • Implementing redirector and tunnel-terminator logic for thousands of parallel IKEv2/IPsec tunnels.
  • Designing control-plane logic that can steer per-vehicle traffic over dual-modem tunnels with dynamic source IPs.
  • Embedding client identity into the protocol stack.
  • Writing automation around Linux networking (iptables/netfilter/XFRM), StrongSwan VICI, and AWS primitives (NLB, ENI, etc.).
  • Writing plugins or extensions for StrongSwan or the Linux IPsec stack if needed.
  • Building observability and traceability for IPsec sessions at scale (IDi, DPD status, per-modem metrics).
  • Debugging packet flows and helping design testable redirect and failover scenarios.

Add these skills to join the top 1% applicants for this job

problem-solving
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networking
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wireshark

##### Project description

We are building a custom high-load and high-scale IPsec backend on AWS to support over 20,000 IKEv2 tunnels for connected vehicles with dual-modem WAN bonding and custom StrongSwan gateways, IPv6-only. We are looking for an experienced network engineer with software development skills to help us create this platform.

##### Responsibilities

  • Implementing redirector and tunnel-terminator logic for thousands of parallel IKEv2/IPsec tunnels. Designing control-plane logic that can steer per-vehicle traffic over dual-modem tunnels with dynamic source IPs.
  • Embedding client identity into the protocol stack
  • Writing automation around Linux networking (iptables/netfilter/XFRM), StrongSwan VICI, and AWS primitives (NLB, ENI, etc.). Writing plugins or extensions for StrongSwan or the Linux IPsec stack if needed.
  • Building observability and traceability for IPsec sessions at scale (IDi, DPD status, per-modem metrics). Debugging packet flows and helping design testable redirect and failover scenarios.

##### Skills

Must have

  • Deep understanding of the Linux networking stack, including iptables, XFRM/IPsec, netfilter, and conntrack.
  • Experience configuring StrongSwan (IKEv2, CHILD_SA lifecycles, MOBIKE, VICI).
  • Solid AWS knowledge at the level of the Advanced Networking Specialty certification or equivalent real-world experience. Able to reason about flow consistency through NLB, GWLB, and EC2 fleet mechanics.
  • Capable of developing code.
  • Comfortable reading packet traces (tcpdump, Wireshark) and analyzing kernel-level behavior.

Nice to have

  • Experience with building custom VPN plugins (e.g., for StrongSwan, Libreswan, or similar).
  • Kernel-space or eBPF experience.
  • Previous work on mobility protocols or embedded network stacks.
  • Familiarity with QNX or automotive telematics protocols.
  • Hands-on experience with VPP, DPDK, or packet reordering logic.
  • IPv6 edge deployment experience.
  • AWS Advanced Networking Specialty certification.

##### Other

Languages

English: C2 Proficient

Seniority

Senior

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