STATION F · 8 hours ago
SENIOR CORE SYSTEMS ENGINEER
Paris, NY
Full-time
Hybrid
Senior Level, Lead/Staff
$180K/yr - $260K/yr
8+ years expDfns is the leading Wallets-as-a-Service (WaaS) platform, helping fintechs, institutions, and enterprises simplify digital asset management. The Core Systems Engineer will design, build, and scale systems at the heart of the platform, focusing on performance, security, and correctness while collaborating across product, research, and security teams.
Business DevelopmentIncubatorsInternet
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
Qualification
Required
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
Preferred
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
Benefits
Healthcare
Travel expenses
Company
STATION F
STATION F is a business incubator for startups.
11-50 employees
Funding
Current Stage
Early StageLeadership Team
Kaan Armagan
Founder in Residence
Romain LAURENT
Founder in Residence
Recent News
The French Tech Journal
2025-11-14
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2025-11-10
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