Principal Engineer at Octet

Jack & Jill/External ATS
Principal Engineer Company Description: VC-backed deep-tech cryptography startup
Job Description:

You will lead the architectural design of a high-integrity, low-latency mobile SDK and proof pipeline at the intersection of sensor fusion, on-device machine learning, and programmable cryptography. As a founding technical leader, you will translate strategic vision into global infrastructure that verifies physical presence, ensuring privacy-by-design while building unbreakable systems for commercial deployment.

Location: London, UK
Why this role is remarkable

• Work on a foundational mission to make physical presence cryptographically verifiable, creating a new primitive for digital security
• Collaborate directly with founders including top-tier academic experts and repeat entrepreneurs backed by world-class venture capital firms
• Drive high-impact 0 1 engineering in a high-agency environment, moving research breakthroughs from paper to production-ready global systems

What you will do

• Architect and build the high-integrity SDK and proof pipeline focusing on Android systems and low-level optimization
• Implement on-device ML models that convert multimodal sensor data into real-time, verified location proofs
• Lead the integration of zero-knowledge proofs (ZKPs) to achieve privacy-preserving verification without compromising performance

The ideal candidate

• 5+ years of experience in spatio-temporal systems, inertial sensors, or high-performance on-device ML for mobile environments
• Proven track record of shipping high-reliability, low-latency mobile SDKs and mastery of Android systems programming
• Strong background in signal processing or cryptography, with the ability to harden cutting-edge research into resilient software