STATION F
About Dfns
Dfns is the leading Wallets‑as‑a‑Service (WaaS) platform that helps fintechs, institutions and enterprises simplify digital asset management and securely onboard users onchain. Built on advanced security and cryptography, Dfns is trusted by over 200 financial institutions and applications—including ABN AMRO, Broadridge, Fidelity, Zodia Custody, Banca Sella, Stripe, Moonpay, Circle, IBM, Deblock, and Gemini—and secures more than $3 billion in monthly transactions.
Job Description Principal Security Engineer
– reporting to the CISO, you will set the strategy to protect our systems, fix vulnerabilities and keep client wallets safe. Your work spans the full security lifecycle: architecture reviews, threat modelling, penetration testing, incident response and secure software practices. You will work closely with engineering, infrastructure and product teams to embed security at every layer of the stack, ensure compliance with industry standards, design new security features, test resilience ideas and share your knowledge through articles or conferences.
Responsibilities
Lead security architecture, setting priorities and ensuring secure, reliable delivery.
Drive threat modelling, vulnerability management and pentesting (internal and external).
Conduct and oversee security reviews of code, design, architecture and dynamic testing.
Design and implement defence‑in‑depth security controls.
Build frameworks for automated security testing and SSDLC enforcement.
Mentor engineers on secure coding, incident response and best practices.
Manage bug bounty, security releases and coordinate with external researchers.
Monitor and respond to emerging threats, including supply‑chain risks.
Represent the company in client discussions, audits and security conferences.
Requirements
10+ years of experience in security engineering, with leadership in fintech or blockchain.
Strong expertise in application security, smart contract security and cryptography.
Deep understanding of pentesting, static/dynamic testing and vulnerability management.
Hands‑on with secure networking, cloud security (AWS) and software supply chains.
Familiar with industry standards and frameworks (ISO 27001, NIST, CIS, SOC 2, etc.).
Strong knowledge of network & web protocols, applied cryptography and PKI.
Experience integrating security into CI/CD pipelines and observability systems.
Proficient in TypeScript and Rust (or similar languages) with secure coding expertise.
Clear communicator who can explain complex security concepts to technical and business stakeholders.
Recruitment Process
Intro call with Co‑CEO (30 min)
Personality and cognitive tests (45 min)
Code test in a language of your choice
Focus interview with the hiring panel (120 min)
Threat model exercise
Infrastructure security
Culture fit check
Final interview with CISO (30 min)
Reference calls and background checks
Terms
Title:
Principal Security Engineer
Salary: $220,000–$300,000 per year (full‑time)
Equity: 150–300 stock options vested over 4 years
Benefits: Healthcare, 401(k), travel expenses
Location: US or EU (remote‑first, office optional)
Equipment: MacBook Pro + essentials
Additional Information
Contract type: Full‑time
Locations: Paris, New York
Experience: >10 years
Possible full‑remote
Salary range: $220,000–$300,000 per year
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Job Description Principal Security Engineer
– reporting to the CISO, you will set the strategy to protect our systems, fix vulnerabilities and keep client wallets safe. Your work spans the full security lifecycle: architecture reviews, threat modelling, penetration testing, incident response and secure software practices. You will work closely with engineering, infrastructure and product teams to embed security at every layer of the stack, ensure compliance with industry standards, design new security features, test resilience ideas and share your knowledge through articles or conferences.
Responsibilities
Lead security architecture, setting priorities and ensuring secure, reliable delivery.
Drive threat modelling, vulnerability management and pentesting (internal and external).
Conduct and oversee security reviews of code, design, architecture and dynamic testing.
Design and implement defence‑in‑depth security controls.
Build frameworks for automated security testing and SSDLC enforcement.
Mentor engineers on secure coding, incident response and best practices.
Manage bug bounty, security releases and coordinate with external researchers.
Monitor and respond to emerging threats, including supply‑chain risks.
Represent the company in client discussions, audits and security conferences.
Requirements
10+ years of experience in security engineering, with leadership in fintech or blockchain.
Strong expertise in application security, smart contract security and cryptography.
Deep understanding of pentesting, static/dynamic testing and vulnerability management.
Hands‑on with secure networking, cloud security (AWS) and software supply chains.
Familiar with industry standards and frameworks (ISO 27001, NIST, CIS, SOC 2, etc.).
Strong knowledge of network & web protocols, applied cryptography and PKI.
Experience integrating security into CI/CD pipelines and observability systems.
Proficient in TypeScript and Rust (or similar languages) with secure coding expertise.
Clear communicator who can explain complex security concepts to technical and business stakeholders.
Recruitment Process
Intro call with Co‑CEO (30 min)
Personality and cognitive tests (45 min)
Code test in a language of your choice
Focus interview with the hiring panel (120 min)
Threat model exercise
Infrastructure security
Culture fit check
Final interview with CISO (30 min)
Reference calls and background checks
Terms
Title:
Principal Security Engineer
Salary: $220,000–$300,000 per year (full‑time)
Equity: 150–300 stock options vested over 4 years
Benefits: Healthcare, 401(k), travel expenses
Location: US or EU (remote‑first, office optional)
Equipment: MacBook Pro + essentials
Additional Information
Contract type: Full‑time
Locations: Paris, New York
Experience: >10 years
Possible full‑remote
Salary range: $220,000–$300,000 per year
#J-18808-Ljbffr