Senior C++ Protocol Engineer (Privacy & Cryptography)

As a Senior C++ Developer at Ledgeroom, you'll work on the core protocol and wallet infrastructure in modern C++ (C++17/20), with a focus on cryptographic correctness, memory safety, and cross-platform reliability. You'll collaborate closely with our cryptographers and protocol researchers to turn papers into hardened, auditable code.

What You'll Do:

• Design and implement core protocol components (transaction construction, consensus rules, P2P networking) in modern C++.
• Integrate and maintain cryptographic primitives (elliptic curve operations, zero-knowledge proof systems, hashing) using well-vetted libraries.
• Build and maintain Ledgeroom's wallet libraries and CLIs across Linux, macOS, and Windows.
• Write unit, integration, and fuzz tests; participate in code review and security audits.
• Profile and optimize hot paths (proof generation/verification, block validation) without sacrificing clarity or safety.
• Contribute to threat modeling and help eliminate side-channel and timing leaks.
• Document APIs and design decisions for auditors and external contributors.

What We're Looking For:

• 4+ years of professional C++ experience (C++14 minimum; C++17/20 preferred).
• Strong grasp of memory safety, RAII, and undefined behavior pitfalls; familiarity with sanitizers (ASan/UBSan/TSan) and fuzzing (libFuzzer/AFL).
• Experience with multi-threaded and networked systems.
• Solid understanding of cryptographic engineering practices (constant-time code, secure key handling) — you don't need to be a cryptographer, but you must respect the discipline.
• Comfort with CMake, Git, and CI/CD pipelines.
• Ability to read and reason about protocol specifications and academic papers.
• Strong written communication skills for a remote, async team.

Nice to Have:

• Prior work on blockchain, consensus, or P2P systems.
• Experience with libsodium, OpenSSL, or secp256k1-style libraries.
• Familiarity with zero-knowledge proof systems (Groth16, Bulletproofs) or ring signatures.
• Rust or Go experience (we have some cross-language tooling).
• Contributions to open-source security-sensitive projects.

What We Offer:

• Competitive salary (range: $140k–$200k USD, depending on experience) plus token allocation.
• Fully remote, flexible hours, async-first culture.
• Budget for conferences, courses, and hardware.
• Meaningful work on privacy infrastructure that matters.

How to Apply:
Send your CV, GitHub profile, and a short note about a piece of C++ code you're proud of (and why) to [email protected]. We especially welcome candidates who can point to prior security-sensitive or open-source work.