Network Engineer / Backend Developer

##### 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