c/c++ developer for secure edge communication

Haystack is a pioneering technology company spun out of Oxford research. It develops patented cryptographic technology for fully decentralised, post-quantum secure communication between connected edge devices, serving industries including manufacturing and smart cities.

• Design and build low-level, network-centric C and C++ engineering focused on OSI Layers 2 and 3;
• Develop technology for secure cloud-to-edge communication, device-to-device authentication, and decentralised routing across millions of industrial edge devices;
• Influence architectural decisions, solve complex networking problems, and contribute to critical security infrastructure;
• Work within a small, specialist engineering team with significant and visible impact;
• Operate deep in the network stack, focusing on packet behaviour, routing, and tunnelling strategies.

• Demonstrate deep network programming experience with C and C++;
• Have strong working knowledge of Layer 3 OSI protocols, low-level packet analysis, and routing;
• Have experience with OSPF, TAP/TUN devices, UDP tunnelling, UDP hole punching, STUN technologies, IPTables, and packet routing strategies;
• Be proficient in code threading, multitasking, IPC, shared-memory communication, and Linux kernel-level development;
• Have 10+ years of experience designing, architecting, and developing sophisticated C++ systems;
• Be comfortable operating in Linux environments, including Debian, CentOS, and embedded variants;
• Understand cryptography and distributed systems.

• Significant equity alongside a competitive base salary;
• Opportunity to work with patented, commercially relevant security technology with global application;
• Work directly influences critical global security infrastructure;
• Join a growing team scaling proven technology beyond academic research.