Senior Core Systems Engineer - Secure Wallet Infrastructure

Location: Remote - Location: US or EU (remote-first, office optional). Must be in the US, not Canada or in the European Union. France or Paris or as close as possible, always preferred.

Compensation: $180K - $260K

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 are hiring a Senior Core Systems Engineer to design, build, and scale the low-level systems at the heart of our platform, where performance, security, and correctness are non-negotiable. This is a high-impact role focused on turning advanced cryptography into fast, resilient, and trusted production infrastructure.

As a Core Systems Engineer, you will work deep in the stack, designing and scaling reliable distributed services and integrating them with cloud, hardware, and blockchain environments. You will collaborate across product, research, and security to implement advanced cryptographic and security protocols using low-level systems languages.

Responsibilities:

• Design, implement, and operate mission-critical security primitives: MPC signers, Hardware Security Modules (HSMs), and Trusted Execution Environments (TEEs) (e.g., AWS Nitro).
• Build low-level services and middleware primarily in Rust and other systems languages.
• Architect distributed databases and stateful services for maximum 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, infrastructure, and product teams to bring new protocols into production.
• Document core systems, share knowledge, and support client and partner discussions.

Requirements

• Experience: 8+ years of systems engineering experience with a focus on security, infrastructure, or backend development.
• Core Language: Deep expertise in Rust, with strong low-level systems programming skills.
• Distributed Systems: Proven experience building distributed systems, consensus mechanisms, or networks.
• Security Hardware: Hands-on experience with HSMs, MPC (Multi-Party Computation), TEEs, and cryptographic key management.
• Databases: Strong knowledge of SQL and NoSQL databases in high-availability environments.
• Security Concepts: Familiarity with secure networking, applied cryptography, and defense-in-depth models.
• Performance: Skilled in observability, debugging, and optimizing performance at scale.
• Communication: Clear communicator, able to translate complex systems into practical solutions.

Benefits

• Title & Compensation: Senior Core Systems Engineer with a salary of $180,000–$260,000 per year (full-time).
• Equity: Generous stock option grant (100–200 stock options) vested over 4 years.
• Work Model: Remote-first role, open to candidates in the US or EU (office optional).
• Equipment: MacBook Pro + essentials.
• Perks: Healthcare, 401K, and coverage for travel expenses.

Due to the high volume of applications we anticipate, we regret that we are unable to provide individual feedback to all candidates. If you do not hear back from us within 4 weeks of your application, please assume that you have not been successful on this occasion. We genuinely appreciate your interest and wish you the best in your job search.

Commitment to Equality and Accessibility:

At MLabs, we are committed to offer equal opportunities to all candidates. We ensure no discrimination, accessible job adverts, and providing information in accessible formats. Our goal is to foster a diverse, inclusive workplace with equal opportunities for all. If you need any reasonable adjustments during any part of the hiring process or you would like to see the job-advert in an accessible format please let us know at the earliest opportunity by emailing human-resources@mlabs.city.

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