Develop and maintain privacy-focused protocol and wallet infrastructure in modern C++. Responsibilities include implementing transaction, consensus, and P2P components; integrating cryptography; supporting cross-platform libraries and CLIs; writing tests and fuzzers; optimizing performance; addressing side-channel risks; and documenting auditable designs. The role requires collaboration with cryptographers and protocol researchers on secure, reliable blockchain-related systems.
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.
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