Join a stellar team of leaders and experts in blockchain technology, cryptography, infrastructure, and security to build the backbone of blockchain wallet infrastructure for the next financial era. We’re hiring a Core Systems Engineer to design, build and scale the systems at the heart of our platform: MPC, HSMs, TEEs, and the middleware that ties them together. You’ll work deep in the stack, building reliable distributed services and integrating them with cloud, hardware, and blockchain environments. This is a low-level, high-impact role where performance, security, and correctness are non-negotiable. You’ll design protocols, optimize databases, and harden workflows that power financial applications at scale. You’ll collaborate across product, research, and security to turn advanced cryptography into Rust-based, production-ready infrastructure that is fast, resilient, and trusted.

Responsibilities

• Design, implement, and operate MPC signers, HSMs, and TEEs (e.g. AWS Nitro).

• Build low-level services and middleware in Rust and other systems languages.

• Architect distributed databases and stateful services for performance and reliability.

• Develop secure APIs and networking between core systems and high-level services.

• Optimize resource usage, latency, and throughput across critical workflows.

• Collaborate with cryptography, infra, and product to bring new protocols into production.

• Document core systems, share knowledge, and support client and partner discussions.

Requirements

• 8+ years of systems engineering experience with focus on security, infra, or backend.

• Deep expertise in Rust, with strong low-level systems programming skills.

• Proven experience building distributed systems, consensus mechanisms, or networks.

• Hands-on experience with HSMs, MPC, TEEs, and cryptographic key management.

• Strong knowledge of SQL and NoSQL databases in high-availability environments.

• Familiarity with secure networking, applied cryptography, and defense-in-depth models.

• Skilled in observability, debugging, and optimizing performance at scale.

• Clear communicator, able to translate complex systems into practical solutions.

Process

• Intro call with Co-CEO (30 min).

• Personality and cognitive tests (45 min)

• Coding test in a language of your choice.

• Focus interviews with the hiring panel (180 min).

  • Code review

  • Architecture review

  • Security fundamentals

  • Culture check fit

• Final interview with CTO (30 min).

• Reference calls and background checks.

Terms

• Title: Senior Core Systems Engineer.

• Salary: $180,000-260,000 per year (full-time).

• Equity: 100-200 stock options vested over 4 years.

• Benefits: Healthcare, 401K, and travel expenses.

• Location: US or EU (remote-first, office optional).

• Equipment: MacBook Pro + essentials.