Are you excited by the idea of working deep in the technical stack, solving hard engineering challenges, and shaping the foundations of cutting-edge security technology? As a Core Engineer at Keyless, you’ll work at the intersection of systems engineering, applied cryptography, secure computation, cross-platform development, and performance-critical C++.

We are building privacy-preserving authentication technology used by global enterprises and you will be a key contributor to the core engine that powers it. From maintaining our cross-platform SDKs to implementing cryptographic protocols and improving performance, reliability, and security, your work will directly impact our products and millions of end users.

This role is ideal for someone who loves low-level engineering, cares deeply about secure and robust software, and enjoys working across multiple platforms, toolchains, and technologies.

If you’re passionate about building core systems, owning complex problems end-to-end, and working in a highly technical environment, we want to hear from you.

What will you do?

You’ll be responsible for designing, building, and maintaining the core components that power our authentication platform. In this role, you will:

• Develop robust, high-performance C++ libraries and SDK components used across mobile, desktop, and server environments.

• Own the build tooling and cross-platform compilation pipeline (Android NDK, iOS, Linux, Windows, macOS) using Make, CMake, and custom toolchains.

• Implement, integrate, and optimise cryptographic primitives using OpenSSL, Botan, and internally designed secure protocols.

• Contribute to our secure multiparty computation engine and privacy-preserving algorithms.

• Work closely with the security team to design defences against reverse engineering, including obfuscation, hardening, symbol management, and binary protection.

• Analyse performance bottlenecks, memory behaviour, and concurrency issues across diverse environments.

• Build Python tooling and automation scripts to streamline development, testing, and deployment workflows.

• Participate in code reviews, architecture discussions, and long-term technical roadmap planning.

• Ensure delivery of high-quality, thoroughly tested, production-ready code across all supported platforms.