Security Engineer

Yousign

Paris

Sur place

EUR 53 000 - 79 000

Plein temps

14 jours+

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Avantages offerts par ce poste

Stock options BSPCE

Meal vouchers Swile

Life & disability insurance

Wellbeing: Axomove & Moka.care

Transit reimbursement 50%

Leeto employee discounts

RTT days and special leave

Volunteering day + development budget

Résumé du poste

Youtrust is expanding from eSignature to a full Digital Trust platform. We seek a Security Engineer to partner with Product, own risk-based guidance, and lead security reviews end-to-end. You will handle BugBounty, manage vulnerabilities, and contribute to eIDAS, NIS2 and ISO 27001 compliance.

The role blends product security with governance across the company. You will operate automation, mentor teams, and help balance security with business velocity, all while advancing a European, sovereign

Qualifications

Deep, hands-on expertise in web application and API security.
Ability to run threat modeling sessions and translate risks into requirements.
Experience managing vulnerabilities across product perimeters and BugBounty programs.
Familiarity with eIDAS, NIS2, ISO 27001 and security certifications.
Proactive in using AI to automate security tasks and reporting.
Comfort working across domains including compliance and fraud prevention.

Responsabilités

Lead end-to-end security review cycles for all product features.
Own and operate BugBounty program: triage, remediation, rewards.
Identify, prioritise, and track remediation of vulnerabilities.
Contribute to security of the Trusted Zone and fraud prevention efforts.
Support regulatory compliance efforts and audits.
Extend security expertise beyond Product to company-wide initiatives.
Participate in weekly on-call rotation and build automation.
Coach teams on secure-by-design practices and security awareness.

Connaissances

Web security

API security

Threat modeling

BugBounty programs

AI in security workflows

Regulatory compliance

Outils

n8n

AI tooling

Description du poste

About Youtrust

Youtrust is a European Digital Trust provider, fully compliant with eIDAS and the highest European standards. Our three modules – electronic signatures, identity and document verification, and e‑seals – can be used independently or combined within sector‑specific workflows, ensuring simple, secure and legally compliant processes for SMEs and mid‑sized companies.
Hosted and processed entirely in Europe, we guarantee sovereignty, transparency and reliability. As a certified B‑Corp, we combine innovation with responsibility – building trust at the heart of every digital exchange.
We are entering a key moment as we expand from eSignature to the full Digital Trust chain.

Your Role

As a Security Engineer at Youtrust, you are the embedded security partner for the entire company, with Product as your primary internal client. You lead Youtrust's security review cycle end-to-end on prioritized initiatives: from understanding the context of a new feature or project, to issuing your requirements and guidance, supporting implementation, and unblocking through risk management when needed.

You own and operate the pentest and BugBounty programs and ensure consistent, pragmatic security coverage across all team initiatives, from Engineering and Product to cross-functional projects company-wide.

You also step into the topics that make Youtrust a Digital Trust provider: the security of our Trusted Zone, our fraud detection and prevention efforts, and our regulatory compliance (eIDAS, NIS2, ISO 27001). You won't own every one of these, but you contribute wherever the team needs you — your specialization defines where you spend most of your time, not a silo you stay inside.

Your Responsibilities

Lead the end-to-end security review cycle for all product features: context intake, Decision Records, implementation support, and risk-based unblocking.
Own and operate Youtrust's BugBounty program: triage reports, drive remediation, and manage reward decisions.
Identify, prioritise, and track remediation of vulnerabilities across Youtrust's product and infrastructure perimeter.
Contribute to the security of the Trusted Zone, and to fraud detection and prevention, alongside the Security & Compliance team.
Support regulatory compliance (eIDAS, NIS2, ISO 27001): help translate requirements into technical controls, and contribute to audits and remediation when needed.
Extend security expertise beyond Product to all company initiatives: assess risks, issue guidance, and maintain a consistent security posture company-wide.
Take part in the team's weekly on-call ("doctor") rotation, and build automation (n8n, AI tooling, alerting) to reduce manual toil.
Raise the security bar across Engineering and beyond: share knowledge, coach teams on secure‑by‑design practices, and build security awareness.

Your Profile

You have deep, hands‑on expertise in web application and API security, you know attack and defense mechanisms inside out and can spot a vulnerability in a PR or architecture diagram.
You are able to independently run threat modeling sessions, produce clear Decision Records, and translate security risks into actionable requirements for engineering teams.
You have experience managing vulnerabilities across a product perimeter: triaging, prioritising, tracking remediation, and knowing when to accept risk versus elevate.
You have participated in or run BugBounty programs. You understand triage workflows, reward logic, and how to communicate decisions clearly to researchers.
You use AI actively to automate parts of your security work, CVE monitoring, BugBounty triage, report generation, and you think critically about how to integrate AI into existing workflows rather than simply adding tools.
You are comfortable working across domains. Your core is product security, but you are happy to contribute to compliance topics (eIDAS, NIS2, ISO 27001), to fraud detection and prevention, and to the security of a Trusted Zone. Prior exposure to a regulated or Digital Trust environment is a strong plus.
You are genuinely self‑sufficient: you pick up a brief, define the scope, and deliver without hand‑holding. You are comfortable in ambiguous, fast‑moving environments.
You are pragmatic by nature. You do not block for the sake of blocking. You find the right balance between security rigour and business velocity, and you know when to block versus when to accept risk.
You communicate clearly and simply. You can explain a complex vulnerability to a non‑security engineer in two minutes, and you coach without being preachy.
You are genuinely curious: you follow threat intel, participate in CTFs, and keep your technical edge sharp because you care about the craft.
French at a native or near‑native level (C2) is required. English at a professional working level (B2) is required for security research, technical documentation, and communication with international BugBounty researchers.

Recruitment Process

R1 — TAM Interview with Guillhem Cambiganu (30 min)
R2 — Hiring Manager Interview with Tony Belot (45–60 min)
R3 — Technical Interview: slide deck presentation + peer discussion with Tony Belot and a member of the Security & Compliance team (1H)
R4 — Director Interview with Kevin Dubourg (30 min)

Benefits

Salary: 53 000 – 79 000 EUR
Stock options - BSPCE
Meal vouchers (Swile): 10.50 EUR/day, 50% covered by Youtrust
Youtrust
Life & disability insurance: 100% employer‑covered
Wellbeing: Axomove (4 physio sessions) and Moka.care (6 therapy/coaching sessions)
Transportation: 50% reimbursement for public transport for hybrid workers
Leeto: Access to numerous employee discounts
Time off: 10 RTT days/year, plus menstrual leave, parenthood benefits, seniority days
1 volunteering day/year, learning & development budget, and more