c/c++ developer secure edge networking

Haystack is a pioneering technology company spun out of Oxford research. It develops patented cryptographic technology for secure, decentralised, post-quantum communication between connected devices at the edge, serving applications from manufacturing to 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.

• Genuine depth in network programming with C and C++;
• Strong working knowledge of Layer 3 OSI protocols, low-level packet analysis, and routing;
• Experience with OSPF, TAP/TUN devices, UDP tunnelling, UDP hole punching, STUN technologies, IPTables, and packet routing strategies;
• Proficiency in code threading, multitasking, IPC, shared-memory communication, and Linux kernel-level development;
• 10+ Years of experience designing, architecting, and developing sophisticated C++ systems;
• Comfort operating in Linux environments, including Debian, CentOS, and embedded variants;
• Understanding of 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.