Security Engineer, Institutional Trading

Blockchain.com; Paris; Sur place; EUR 110 000 - 150 000; Plein temps

Avantages offerts par ce poste

Unlimited vacation

Unlimited books

Full-time salary tied to experience

Paris office with 4 days in-office

Work from Anywhere up to 20 days/year

Résumé du poste

Blockchain.com is seeking a hands-on Security Engineer embedded with the Institutional Trading and FinOps team in Paris. You will ensure secure operation of off-chain trading processes, manage risk through vulnerability assessments, and drive security maturity across data flows, third-party integrations, and key custody interfaces.

A high-visibility role focusing on operational security engineering. The ideal candidate has 5+ years in security engineering, experience with KMS/Vault, SIEM, and LB

Qualifications

• 5+ years in security engineering, platform security, or application security.
• Proven Threat Modeling expertise (e.g., STRIDE).
• Experience with observability and detection tooling (SIEM, logs, metrics).
• Practical experience with KMS/HSM, secrets management platforms (Vault, 1Password, AWS/GCP KMS).
• Exceptional ability to translate technical debt into business risk for C-suite stakeholders.

Responsabilités

• Partner with Trading, Middle Office and Quant teams to map inventory trading systems and data flows.
• Conduct deep-dive assessments to identify vulnerabilities and draft Risk Treatment Plans.
• Act as security liaison for Senior Management and vendors; translate gaps into business risk.
• Implement and maintain monitoring for FinOps security signals in SIEM/SOAR.
• Assist product security in triage of SAST/SCA findings and CI remediation playbooks.
• Participate in incident exercises, post‑incident reviews and remediation tracking.

Connaissances

Threat modeling

Security engineering

Executive communication

Business risk translation

Code review readiness

Outils

KMS/HSM

Vault

1Password

AWS/KMS

GCP KMS

Description du poste

Blockchain is connecting the world to the future of finance. As the most trusted and fastest-growing global crypto company, it helps millions of people worldwide safely access cryptocurrency. Since its inception in 2011, Blockchain has earned the trust of over 90 million wallet holders and more than 40 million verified users, facilitating over $1 trillion in crypto transactions.

You’ll be the hands-on security engineer embedded with the Institutional Trading and Financial Operations (FinOps) team. Your focus is the secure operation of off-chain trading processes and infrastructure that empowers our institutional business: integrations, signing flows, key custody interfaces, middle-office workflows, order routing and settle pipelines that handle significant capital. You will support risk assessments, operating controls, automation to detect operational anomalies and remediation coordination. This is a high-visibility role where you will focus on operational security engineering - ensuring that the tools and processes our traders use are resilient against both external threats and internal errors. This role does not require smart-contract auditing.

WHAT YOU WILL DO

• Partner with Trading, Middle Office and Quant (Institutional FinOps) teams to map out inventory trading systems, data flows, third-party integrations and custody/settlement touchpoints.
• Conduct deep-dive assessments mapping critical assets and workflows to identify structural vulnerabilities. You will be responsible for defining the Target State and drafting the strategic Risk Treatment Plans (RTP) required to meet institutional-grade standards (e.g., CCSS, NIST, DORA).
• Act as the primary security liaison for Senior Management and third-party vendors. You will translate complex technical gaps into actionable business risk summaries, drive vendor evaluations for core security infrastructure, and manage the project lifecycle for high-impact posture uplifts.
• Implement and maintain monitoring for FinOps-specific security signals such as abnormal order patterns, signature misuse, unusual settlements. You will integrate these signals into our SIEM/SOAR for real-time response.
• Support secrets and key-­management hygiene. You will ensure app/service keys are stored in KMS/Vault, scoped to least privilege and rotated automatically to prevent credential leakage.
• Assist product security in triage of SAST/SCA findings for FinOps-related repositories. You will help implement CI checks and remediation playbooks.
• Participate in incident exercises, post‑incident reviews and remediation tracking for trading incidents.
• Document controls and produce concise risk summaries for FinOps leads and the Security.
• AI‑Driven Innovation: Research, architect, and safely embed cutting‑edge AI utilities and Large Language Model (LLM) agents directly into our secure infrastructure.

WHAT YOU WILL NEED

• 5+ years in security engineering, platform security, or application security experience.
• Proven expertise in Threat Modeling. Ability to perform structured reviews (e.g., STRIDE) of complex data flows and operational processes.
• Experience with observability and detection tooling (SIEM, logs, metrics) and ability to write basic detection rules.
• Practical experience with KMS/HSM, secrets management platforms (Vault, 1Password, AWS/GCP KMS), IAM patterns and least‑privilege.
• Exceptional ability to translate "Technical Debt" into Business Risk for C‑suite stakeholders (CFO, CTO, Head of Trading).
• Ability to raise, read and audit Pull Requests in at least one language used in our stack (TypeScript, Java/Kotlin, Python).
• Experience conducting technical due diligence and scoping for third‑party security integrations.

NICE TO HAVE

• Familiarity with trading systems or financial operations (market‑making, execution, settlement) or close collaboration background with trading/quant teams.
• Exposure to blockchain on‑chain concepts (wallets, addresses, transactions) but no requirement to audit contracts.
• Familiarity with SOC operations, and post‑incident forensic analysis.
• Familiarity with SOC2, ISO 27001, or financial audit requirements
• Any relevant industry certification

COMPENSATION & PERKS

• Unlimited vacation policy; work hard and take time when you need it.
• Unlimited books policy; order the technical resources you need or simply pick something up from our company library.
• Full-time salary based on experience and meaningful equity in an industry‑leading company.
• Role based in our Paris office, with a mandatory in-office presence four days per week
• Work from Anywhere Policy: You can work remotely from anywhere in the world for up to 20 days per year.

Blockchain is committed to diversity and inclusion in the workplace and is proud to be an equal opportunity employer. We prohibit discrimination and harassment of any kind based on race, religion, color, national origin, gender, gender expression, sex, sexual orientation, age, marital status, veteran status, disability status or any other characteristic protected by law. This policy applies to all employment practices within our organization, including hiring, recruiting, promotion, termination, layoff, recall, leave of absence, and apprenticeship. Blockchain makes hiring decisions solely based on qualifications, merit, and business needs at the time.

"You may contact our Data Protection Officer by email at [e-mail]. Your personal data will be processed for the purposes of managing Controller’s recruitment related activities, which include setting up and conducting interviews and tests for applicants, evaluating and assessing the results thereto, and as is otherwise needed in the recruitment and hiring processes. Such processing is legally permissible under Art. 6(1)(f) of Regulation (EU) 2016/679 (General Data Protection Regulation) as necessary for the purposes of the legitimate interests pursued by the Controller, which are the solicitation, evaluation, and selection of applicants for employment."

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