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. Responsibilities include implementing redirector and tunnel-terminator logic for thousands of parallel IKEv2/IPsec tunnels, designing control-plane logic for steering per-vehicle traffic over dual-modem tunnels with dynamic source IPs, embedding client identity into the protocol stack, writing automation around Linux networking, StrongSwan VICI, and AWS primitives, and building observability and traceability for IPsec sessions at scale.

Good To Have:

Experience building custom VPN plugins
Kernel-space or eBPF experience
Experience with 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:

Deep understanding of Linux networking (iptables, XFRM/IPsec, netfilter, conntrack)
Experience configuring StrongSwan (IKEv2, CHILD_SA, MOBIKE, VICI)
Solid AWS knowledge (Advanced Networking Specialty or equivalent)
Capable of developing code
Comfortable reading packet traces and analyzing kernel behavior

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

problem-solving

networking

linux

aws

wireshark

Project description

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.