79 Emplois pour Cissp - Paris

The right career for allCreated in 2006, leboncoin.fr is an exchange platform that simplifies access to consumption, favors local relations and makes digital a tool at the service of all. leboncoin is positioned as a digital, economic, societal, innovative player, always with the same objective: to facilitate all day-to-day exchanges for all of our users. We give a second life to thousands of goods. Behind this apparent simplicity, there is a fast-growing company with 1,400 employees, where it is good to work, a company that cultivates a responsible and collective HR approach. We are also the 1st site for sales between individuals in France and the 5th most consulted site in France.# **What you’ll do & Who you are***Job description:**As part of our Operational Security team, you will play a key role in strengthening our defensive posture.You will work in an environment where security is seen as an enabler, not a hindrance. The team works across all systems, networks and internal infrastructures - from the public cloud to user workstations, whatever the OS.# **Your responsibilities*** Qualifying and managing security incidents in coordination with the IT, Product, Infra and Dev teams (both for internal security and for the Leboncoin platform)* Threat detection and implementation of threat hunting strategies* Participation in the design of automatic incident response tools (SOAR-like)* Carrying outforensic analyses (memory, disks, network traces) to understand operating modes and strengthen protection measures* Helping to develop and feed our in-house Cyber Threat Intelligence platform* Helping to define security incident response plans* Active monitoring of new vulnerabilities, TTPs, IOCs and changes in the threat landscape* Possibility of participating in offensive security campaigns (tests, audits, red teaming), if desired* Availability for regular on-call duty (nights and weekends) depending on the needs of the department.# # **What you bring**# **Experience & know-how :*** 2+ years' experience in IT security (defensive and/or offensive)* Proficiency in at least one scripting language, ideally Python* Solid knowledge of AWS cloud infrastructure* Mastery of the main security tools: EDR, NDR, SIEM, Antivirus, logging/monitoring tools* Ability to carry out forensic analysis (using standard frameworks as a minimum)* Experience of security crisis management / incident response* Fluent English: international environment (Adevinta group)# Soft skills :* Team spirit, benevolence and humility* Ability to build relationships with leboncoin's (technical) teams* Impeccable integrity and confidentiality* Strong analytical skills, autonomy and a sense of priorities* An interest in technology, innovation, troubleshooting and continuous improvement# # **Benefits:*** Pleasant working conditions (offices, possibility of teleworking.)* Attractive remuneration (fixed, variable and* profit-sharing)* Opportunities for rapid, tailor-made professional developmen* The meal voucher card* Efficient and competitive health and provident insurance cover* In addition to these, we offer other benefits.Adevinta is an equal opportunity employer and we value diversity. We do not discriminate on the basis of race, religion, colour, national origin, gender, sexual orientation, age, marital status or disability status. If you feel like you don’t meet all of the requirements for this role but are interested, please consider applying anyway. Research suggests that women and individuals from underrepresented groups may self-select out of opportunities if they don’t meet 100% of the job requirements. We strongly encourage people from historically excluded groups to apply and look forward to speaking with you.# Discover your purpose at AdevintaBe part of an organisation that is making a positive difference in the world. Together, we’re supporting the circular economy and creating a more sustainable future by helping millions of people find perfect matches on our trusted marketplaces.
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Overview

Join to apply for the Security Engineer role at Ageras .

About Ageras

At Ageras, we are redefining how entrepreneurs—freelancers, self-employed professionals, and SMEs—manage their banking and administrative tasks. Through seamless tools and innovative accounting and banking solutions, we help them focus on what matters most: growing their businesses.

Our vision is to become the best friend of every small entrepreneur across Europe. Over the years, Ageras has grown through the merging of top European FinTechs like Shine, Kontist, Tellow, and more. Today, we’re a team of nearly 500 people, including 150 engineers, working from Paris, Amsterdam, Copenhagen, and Berlin.

Security at Ageras

As a FinTech, we have a strong security vision to protect our clients, our own infrastructure, and our employees. We are looking for Security Engineers to help improve our security standards. You’ll work mainly on technical topics (software, cloud and endpoint security) but may also work on organizational topics (risk assessments, compliance, project management) if necessary.

Team and collaboration

The Security team is cross-functional, partnering with Engineering (Platform, Data and Feature squads) to improve product security, as well as Internal IT, Operations, Customer Experience, Compliance, Legal, People & Office Management, Finance, and Growth teams.

Your Role as a Security Engineer

• Shaping and enforcing security strategy for 300K+ users and 450+ employees, keeping Ageras at the forefront of cybersecurity.
• Strengthening product security by reviewing architecture, infrastructure, and code with Engineering and delivering guidance to ensure compliance with security standards and applicable regulations.
• Hunting vulnerabilities through penetration testing, bug bounty programs, and continuous security monitoring and auditing.
• Detecting and mitigating threats by implementing and improving security tools (SIEM, SOAR, EDR, SAST, DAST, SSPM, CNAPP, etc.).
• Investigating incidents and conducting forensics analysis to stay ahead of emerging risks.
• Automating security checks to ensure compliance with industry standards (CIS, NIST CSF).
• Driving security awareness by training employees and supporting internal IT security initiatives.

About you

• 3+ years of experience in IT security, ideally in a regulated environment (fintech, banking, insurance, etc.).
• Knowledge of security best practices (architecture, systems, networks, applications, cloud services) and familiarity with security standards (OWASP, NIST CSF, SOC2, PCI DSS).
• Development experience, ideally in JavaScript/TypeScript and Python.
• Experience in a scale-up or tech-driven (cloud-native) company.
• Ability to propose innovative, secure solutions without compromising reliability and performance.
• Strong willingness to learn, share knowledge, and collaborate.
• Attention to detail and a security-first mindset.
• Comfortable working in English.

Equal Opportunity Employer. We follow the principle of equal treatment to consider all job applicants and do not discriminate based on gender, sexual orientation, color, racial or ethnic origin, religion, disability, etc., as per applicable law.

Recruitment process

A 30-minute introductory call with a Talent Acquisition Specialist to get to know you and share more about Ageras' culture and mission.

A 45-minute conversation with Claudio Salazar, Senior Security Engineer, to discuss your technical experience, career aspirations, and vision for this role.

A 45-minute technical interview to highlight your skills and give you a hands-on feel for the role.

A 60-minute soft skills interview based on a personality assessment to see how we can best support your growth at Ageras.

Location and opportunities

Get notified about new Security Engineer jobs in Paris, Île-de-France, France.

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Overview

Join to apply for the Security Engineer role at Leboncoin.fr .

Leboncoin, created in 2006, is an exchange platform that simplifies access to consumption, fosters local relations and makes digital a tool at the service of all. Leboncoin is a digital, economic, societal, innovative player with the objective to facilitate day-to-day exchanges for all users. It is a fast-growing company with about 1,400 employees, a responsible and collective HR approach, and is the first site for person-to-person sales in France and the fifth most visited site in France.

Job Description

What you’ll do and who you are

As part of our Operational Security team, you will play a key role in strengthening our defensive posture. You will work in an environment where security is seen as an enabler, not a hindrance. The team works across all systems, networks and internal infrastructures—from the public cloud to user workstations, whatever the OS.

Responsibilities

• Qualifying and managing security incidents in coordination with the IT, Product, Infra and Dev teams (both for internal security and for the Leboncoin platform)
• Threat detection and implementation of threat hunting strategies
• Participation in the design of automatic incident response tools (SOAR-like)
• Carrying out forensic analyses (memory, disks, network traces) to understand operating modes and strengthen protection measures
• Helping to develop and feed our in-house Cyber Threat Intelligence platform
• Helping to define security incident response plans
• Active monitoring of new vulnerabilities, TTPs, IOCs and changes in the threat landscape
• Possibility of participating in offensive security campaigns (tests, audits, red teaming), if desired
• Availability for regular on-call duty (nights and weekends) depending on the needs of the department

What You Bring

• 2+ years' experience in IT security (defensive and/or offensive)
• Proficiency in at least one scripting language, ideally Python
• Solid knowledge of AWS cloud infrastructure
• Mastery of the main security tools: EDR, NDR, SIEM, Antivirus, logging/monitoring tools
• Ability to carry out forensic analysis (using standard frameworks as a minimum)
• Experience of security crisis management / incident response
• Fluent English: international environment (Adevinta group)

Soft Skills

• Team spirit, benevolence and humility
• Ability to build relationships with Leboncoin's (technical) teams
• Impeccable integrity and confidentiality
• Strong analytical skills, autonomy and a sense of priorities
• An interest in technology, innovation, troubleshooting and continuous improvement

Benefits

• Pleasant working conditions (offices, possibility of teleworking.)
• Attractive remuneration (fixed, variable, and profit-sharing)
• Opportunities for rapid, tailor-made professional development
• The meal voucher card
• Efficient and competitive health and provident insurance cover
• In addition to these, we offer other benefits.

Want to find out more? Apply and ask our recruiters!

Adevinta is an equal opportunity employer and we value diversity. We do not discriminate on the basis of race, religion, colour, national origin, gender, sexual orientation, age, marital status or disability status.

If you feel like you don’t meet all of the requirements for this role but are interested, please consider applying anyway. Research suggests that women and individuals from underrepresented groups may self-select out of opportunities if they don’t meet 100% of the job requirements. We strongly encourage people from historically excluded groups to apply and look forward to speaking with you.

Details

• Seniority level: Mid-Senior level
• Employment type: Full-time
• Job function: Information Technology
• Industries: Software Development

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Overview

Join to apply for the Security Engineer role at C12 .

C12 develops quantum computers to solve highly complex computing tasks, currently out of reach of even the most powerful supercomputers. Building a quantum computer still needs innovators ready to tackle exciting challenges. C12's founders are convinced that only a new material for the qubit will bring a technological breakthrough. C12 uniquely uses carbon nanotubes as the fundamental building blocks of its quantum processor. This high-purity material minimises errors, radically improves performance and reduces hardware overhead for fault-tolerant computing. Combined with well-established semiconductor techniques, carbon nanotubes will help scale quantum computing, just as silicon revolutionised classical computing. Our unique & innovative quantum computing technology enables us to address use cases, solving intractable problems our industrial customers are facing.

Founded in 2020, C12 is a fast-growing start-up, that recently raised EUR 18 million in 2024 to further its research in its own lab in the heart of Paris (Panthéon).

Your role at C12 Quantum Electronics

As a Security (and Systems) Engineer, you will play a key role in protecting information systems while managing the internal IT infrastructure.

Your responsibilities will include:

• Assisting the Head of Software Development in evaluating and reporting on information system security (ISS) objectives
• Participating in compliance audits and responding to security questionnaires from clients and partners
• Performing risk analyses and overseeing penetration tests in coordination with the Head of Software Development
• Organising phishing awareness campaigns and conducting security training sessions
• Managing vulnerabilities and contributing to business continuity and disaster recovery plans (BCP/DRP)
• Participating in security crisis management and cybersecurity committee activities
• Updating and maintaining the information systems security repository
• Ensuring the proper functioning and security of internal infrastructure (networks, VPNs, remote access)
• Proposing and implementing solutions to optimise internal IT management
• Overseeing updates for internal systems and applications to ensure security and performance.

What we expect from you

• You have a degree in IT, Information Security, or a related field
• You have a minimum of 3 years of experience in information system security and IT management
• You are knowledgeable on ISO 27001/27002 standards and risk management practices
• You have experience managing internal IT infrastructure (IT equipment, networks)
• Security certifications (CISSP, CISM) or IT management certifications (ITIL, Microsoft, etc.) are a plus
• You have excellent problem-solving, communication and service-oriented skills
• You are fluent in English and French

Why join us

• You want to have a key role in a growing startup with challenges at the frontier of the technology.
• You want to contribute to achieving landmark results in quantum computing, making a difference in the emerging quantum technologies.
• You want to work within a 50-people team with various backgrounds in nanofabrication, quantum electronics, and carbon nanotube science to create a revolutionary quantum computing processor.
• You want to thrive in an exceptional scientific environment with several industrial and academic partners.
• You share our values (excellence, scientific integrity, diversity, curiosity, and care) and want to help us define our product-focused culture and ambition to accelerate.

At C12, a qubit, the fundamental functional unit of a quantum computer, is built from an isotopically ultra-pure 12C nanotube suspended above a silicon chip containing control electrodes and a quantum communication bus. Our spin qubits hold great promise in terms of individual control and manipulation as well as for the circuit architecture. A suspended isotopically-pure 12C nanotube holds great promise in terms of stability, as it reduces all sources of decoherence (charge noise, nuclear spin noise and phonon relaxation).

C12 encourages all who feel qualified to apply. Recruitment decisions are based solely on qualifications, skills, knowledge and experience. Applications from women are particularly welcomed.

Seniority level

• Associate

Employment type

• Full-time

Job function

• Information Technology

Industries

• Information Services

Referrals increase your chances of interviewing at C12 by 2x

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Overview

Senior Cyber Security Engineer

A cutting-edge quantum computing start-up in Paris is looking for a Security Engineer to safeguard its internal systems and help scale its secure IT environment. Backed by recent multi-million euro investment, this venture is pioneering a novel approach to quantum processing by combining advanced materials science with semiconductor technology — with the goal of solving problems far beyond the reach of today's supercomputers.

You’ll work cross-functionally to:

• Lead and evolve internal information security practices
• Support compliance efforts and client security questionnaires
• Oversee risk assessments, vulnerability management & penetration testing
• Run internal IT infrastructure — ensuring secure, reliable systems (VPN, networks, endpoints)
• Deliver phishing simulations, training, and BCP/DRP support
• Shape long-term security posture in tandem with R&D and software teams

What You Bring

• 3+ years in IT security or internal systems management
• Knowledge of ISO 27001/27002 and risk frameworks
• Experience managing internal networks, endpoints, and infrastructure
• (Bonus) CISSP, CISM, or IT management certifications (ITIL, etc.)
• Fluent in English and French
• Be part of a 50-person team solving frontier challenges in quantum hardware
• Contribute to breakthrough results in a secure, research-led environment
• Work in a collaborative, excellence-driven culture based in the Latin Quarter
• Thrive at the intersection of quantum science , semiconductors , and cybersecurity

Curious?

Apply in confidence to explore a role where security meets the future of computing.

Location

• Paris, France (Latin Quarter)

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Overview

At Ageras, we are redefining how entrepreneurs—freelancers, self-employed professionals, and SMEs—manage their banking and administrative tasks. Through seamless tools and innovative accounting & banking solutions, we help them focus on what matters most: growing their businesses. Our security vision is to protect both our clients and our own infrastructure and employees. We are looking for Security Engineers to help us improve our security standards. You’ll work mainly on technical topics (software, cloud and endpoint security) but you should also be able to handle organisational aspects (risk assessments, compliance, project management). The Security team is cross-functional, partnering with Engineering (Platform, Data and Feature squads), Internal IT, Operations, Customer Experience, Compliance, Legal, People & Office Management, and Finance & Growth. Today, we are a team of nearly 500 people, including 150 engineers, working from Paris, Amsterdam, Copenhagen, and Berlin. Over the years, Ageras has grown through the merging of top European FinTechs like Shine, Kontist, Tellow, and more.

Responsibilities

• Shaping and enforcing security strategy for 300K+ users and 450+ employees, keeping Ageras at the forefront of cybersecurity.
• Strengthening product security by reviewing architecture, infrastructure, and code with Engineering and delivering guidance to ensure compliance to security standards and applicable regulations.
• Hunting vulnerabilities through penetration testing, bug bounty programs, and continuous security monitoring and auditing.
• Detecting and mitigating threats by implementing and improving security tools (SIEM, SOAR, EDR, SAST, DAST, SSPM, CNAPP, etc.).
• Investigating incidents and conducting forensics analysis to stay ahead of emerging risks.
• Automating security checks to ensure compliance with industry standards (CIS, NIST CSF).
• Driving security awareness by training employees and supporting internal IT security initiatives.

Qualifications

• Have 3+ years of experience in IT security, ideally in a regulated environment (fintech, banking, insurance…).
• Know security best practices (architecture, systems, networks, applications, Cloud services) and a few security standards (among OWASP, NIST CSF, SOC2, PCI DSS).
• Are comfortable with development, ideally in JavaScript/TypeScript and Python.
• Have experience in a scale-up or tech-driven (Cloud-native) company.
• Propose innovative, secure solutions without compromising reliability and performance.
• Love learning, sharing knowledge, and collaborating.
• Have strong attention to detail and a security-first mindset.
• You’re comfortable working in English.

Equal Opportunity Employer

We follow the principle of equal treatment to consider all job applicants and do not discriminate based on their gender, sexual orientation, color, racial or ethnic origin, religion, disability, etc. as per applicable law.

Our recruitment process

• A 30’ introductory call with Talent Acquisition Specialist to get to know you better and share more about Ageras' culture and mission.
• A 45’ conversation with Claudio Salazar, Senior Security Engineer where you will dive into your technical experience, career aspirations, and vision for this role.
• A 45' technical interview to highlight your skills and give you a hands-on feel for the role.
• A 60' soft skills interview based on the personality assessment to see how we can best support your growth at Ageras.

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A better internet, where privacy is the default, is possible. Building this better internet might seem daunting or even unthinkable, but at Proton, this is what we do every day.

Proton was founded in 2014 by a group of scientists who met at the European Organization for Nuclear Research (CERN). Our first product, Proton Mail , is now the world’s largest encrypted email service. Subsequent Proton products, such as Proton VPN , Proton Calendar , Proton Drive and Proton Pass give our users full control over how and with whom their data is shared.

Today, Proton makes privacy universally accessible. Journalists from outlets likeThe GuardianandThe New York Times, some of the world’s largest organizations, and people in more than 180 countries have signed up for over 100 million accounts. Our diverse and dynamic team is made up of more than 400 members representing over 40 different nationalities. While we are based in Geneva, Switzerland, we have offices in Zurich, Prague, London, Vilnius, Skopje, Taipei, Paris, Barcelona and many more employees working remotely around the world.

Join one of Europe’s fastest-growing companies to help us solve challenging problems and build new products that will reach hundreds of millions of people. We want to create more than just one of the world’s most impactful tech companies; we want to create a new internet that serves the interests of all people. We need you, your voice, your ideas, and your ambition to make it happen.

The Team

The Security team is tasked with protecting Proton’s against various cyber-security threats. We ensure the confidentiality, availability and integrity of thousands of assets, necessary to the fulfillment of Proton’s privacy mission. Since 2018, the team has been providing services to other business units, including security monitoring, risk management, internal advisory, product security auditing, vulnerability management and identity & access management. Our mandate includes the protection of people, devices, applications, infrastructure, data and software within the company. We work with on-prem and open source tools.

What you will do :

• Collaborate with teams at Proton to develop and improve our security posture
• Provide technical support and guidance to the company on security-related topics
• Design, deploy and maintain Linux-based systems used by the security team (e.g. IAM, SIEM, .)
• Responsible for the operation of some critical IAM services (e.g. Midpoint, Keycloak, FreeIPA) that must run reliably 24 / 7
• Be proactive for identifying areas of improvement and implementing effective solutions
• Debug and resolve infrastructure issues efficiently, applying your problem-solving skills to maintain system stability and performance
• Automate routine tasks using configuration management tools and scripting languages (e.g. Puppet, Ansible, Terraform, Python, Bash)
• Monitor system performance, ensure system availability, and reliability
• Ensure any systems are equipped with proper logging, monitoring, alerting, and documentation
• Provide technical engineering support and guidance to the security team in all of its projects
• Assist the security team with monitoring network and systems activities for security breaches and respond to incidents
• Assist the security team in the development and enforcement of security policies and procedures.

What we are looking for :

• Motivated and detail-oriented professional with a passion for cybersecurity
• Proven security experience and understanding
• Proficient with Linux-based systems and services administration (e.g. Postgres, Redis, Elastic)
• Experience with infrastructure automation (e.g. Puppet, Ansible, Terraform)
• Proficient in scripting languages (e.g. Bash, Python)
• Knowledge in IAM tools, processes and workflows
• Ability to work independently and manage multiple projects simultaneously
• Excellent English communication and teamwork skills.

Bonus points for :

• Extensive IAM knowledge and experience
• Extensive experience with IAM tools (e.g. Midpoint, Keycloak)
• Experience in monitoring security systems, networks, and applications for potential threats and vulnerabilities

Even if you don’t meet all the requirements listed above, but feel you could still be a great fit, please still apply.

Why should you join Proton?

• Be part of a movement - Proton is not just a product or service but a community-driven movement united by a shared vision of online freedom. Our services are open source, audited, and supported by community contributions. We give back to our community by maintaining core encryption libraries and by supporting other organizations furthering the same goals as us.Proton is free, open source, neutral, independent, and community first, while remaining financially sustainable.
• Work with smart and dedicated people - Our team is diverse, collaborative, and tight-knit with people coming from all walks of life, including many of the world’s top academic institutions and organizations, such as MIT, Harvard, Stanford, Caltech, Cambridge, and ETH.
• Join a strong brand - Our encrypted email service - ProtonMail - has grown to be a staple of online security and privacy. Proton has been featured in multiple popular television and film productions, such as Mr. Robot, Knives Out, Sounds of Metal, and more.
• Grow with us - We’re one of Europe’s fastest-growing startups, doubling in size every year. Our growth gives you limitless career and educational opportunities as well as the opportunity to work side-by-side with many world-leading experts in their fields.
• Have your voice heard - We value your opinion and encourage you to speak up and share your ideas and thoughts. At Proton, no problem is someone else’s problem. We collectively strive to do the right thing and be the undisputed best in the world at everything we do.
• Benefits – these vary by location and type of contract but expect support on your vacation, parental leave, refreshment if working from the office, learning and development opportunities, equity for shared success, flexible working hours and remote work, company events and team building activities.

Proton does not accept unsolicited resumes from any sources other than directly from a candidate. Proton will not pay a fee for any placement resulting from the receipt of an unsolicited offer, even in a situation when the relevant candidate is employed by Proton.

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