Senior Software Security Engineer (f/m)
Status
Paris, France
Full time
Office
Compensation is not specified
Role
Security Engineer
Description
We are a forward-thinking team of innovators, dedicated to revolutionizing digital ownership in a dynamic world. Our mission goes beyond commercial interests as we strive to unlock authentic freedom through our cutting-edge products.
At Ledger, founded in 2014, we are the global frontrunners in digital assets and Web3 technologies. With our headquarters in Paris and Vierzon, and additional offices across various countries, our team of over 700 professionals is committed to enabling secure transactions and management of crypto assets for individuals and businesses worldwide.
If you join us as a security engineer focused on consumer services, you will play a crucial role in ensuring the robustness and integrity of our products and ecosystem. Your daily tasks will involve identifying vulnerabilities, developing offensive security strategies, and conducting security assessments to uphold our industry leadership.
Responsibilities:
- Collaborate closely with development teams to detect and remedy vulnerabilities in backend services and APIs.
- Engage in ongoing research to stay informed about advanced offensive security methods.
- Create tools and exploits for our products and provide solutions for identified issues.
- Conduct security assessments and threat evaluations for Ledger's services ecosystem including DeFi services.
- Encourage secure coding practices within the engineering teams and present findings at global conferences.
Requirements:
- Prior experience in security, especially in blockchain security, is advantageous.
- Proficiency in applied cryptography with a basic understanding of financial services.
- Self-motivated with a keen interest in evolving security landscapes.
Technical Skillset:
- Advanced experience in web/backend penetration testing.
- Proficiency in secure programming using Python, Rust, and basic knowledge of Scala.
- Familiarity with Kubernetes and cloud infrastructure.
- Knowledge of exploitation techniques and relevant preventive measures.
- Ability to automate security analysis and design secure architectures.
Perks:
- Equity opportunities through stock options to benefit from the company's growth.
- Hybrid work policy for flexible work arrangements.
- Social events, annual company outings, snacks, and drinks for a vibrant work environment.
- Comprehensive health insurance coverage including medical, dental, and vision care.
- Personal development and fitness support.
- Generous vacation time with additional leave including national holidays.
- Access to high-performance office equipment and gadgets.
- Transportation reimbursement and employee discounts on all products.
We guarantee equal opportunities for all candidates throughout the recruitment process, irrespective of gender, ethnicity, religion, sexual orientation, social status, disability, or age.
Skills Required
Ledger
Website
www.ledger.comCompany size
Not specified
Location
United States
Description
Not specified
Status
gigi dalesio
Ассистент по проектам веб-разработки и веб-дизайна
Full time
Remote
Менеджер проектов – Веб и Крипто (Удалённо)
Мы ищем опытного менеджера проектов для управления проектами по веб-разработке и дизайну в сфере криптовалют.
Вы будете отвечать за полную реализацию проектов — от начала до сдачи, управляя собственной командой или координируя работу фрилансеров.
Обязанности:
Управление полным жизненным циклом проекта (планирование → сдача)
Координация разработчиков, дизайнеров и фрилансеров
Определение сроков, этапов и результатов
Обеспечение качества и своевременной сдачи проектов
Прямое взаимодействие с заказчиками
Требования:
Подтверждённый опыт управления веб-проектами
Умение работать самостоятельно или руководить командой
Опыт работы с фрилансерами
Сильные организационные и коммуникативные навыки
Базовое понимание криптовалют / Web3
Оплата:
От $3000 в месяц
Выплаты в криптовалюте (по желанию)
Долгосрочное сотрудничество
Мы предлагаем:
Полностью удалённую работу
Постоянный поток проектов
Возможность роста в сфере криптовалют
Важно:
Мы ищем человека, способного качественно и в срок реализовывать проекты «под ключ».
Мы ищем опытного менеджера проектов для управления проектами по веб-разработке и дизайну в сфере криптовалют.
Вы будете отвечать за полную реализацию проектов — от начала до сдачи, управляя собственной командой или координируя работу фрилансеров.
Обязанности:
Управление полным жизненным циклом проекта (планирование → сдача)
Координация разработчиков, дизайнеров и фрилансеров
Определение сроков, этапов и результатов
Обеспечение качества и своевременной сдачи проектов
Прямое взаимодействие с заказчиками
Требования:
Подтверждённый опыт управления веб-проектами
Умение работать самостоятельно или руководить командой
Опыт работы с фрилансерами
Сильные организационные и коммуникативные навыки
Базовое понимание криптовалют / Web3
Оплата:
От $3000 в месяц
Выплаты в криптовалюте (по желанию)
Долгосрочное сотрудничество
Мы предлагаем:
Полностью удалённую работу
Постоянный поток проектов
Возможность роста в сфере криптовалют
Важно:
Мы ищем человека, способного качественно и в срок реализовывать проекты «под ключ».
Payment in Crypto
gigi dalesio
Assistant for web development and web design projects
Full time
Remote
Project Manager – Web & Crypto (Remote)
We are looking for an experienced Project Manager to manage web development and design
projects in the crypto space.
You will be responsible for delivering projects end-to-end, either by managing your own team or
coordinating freelance professionals.
Responsibilities:
- Manage full project lifecycle (planning → delivery)
- Coordinate developers, designers, and freelancers
- Define timelines, milestones, and deliverables
- Ensure quality and on-time delivery
- Communicate directly with stakeholders
Requirements:
- Proven experience in web project management
- Ability to work independently or lead a team
- Experience working with freelancers
- Strong organizational and communication skills
- Basic understanding of crypto / Web3
Compensation:
- Starting from $3000/month
- Paid in crypto (optional)
- Long-term collaboration opportunity
What we offer:
- Fully remote position
- Continuous flow of projects
- Opportunity to grow within the crypto space
Important:
We are looking for someone who can deliver complete turnkey projects with high quality and within
deadlines.
We are looking for an experienced Project Manager to manage web development and design
projects in the crypto space.
You will be responsible for delivering projects end-to-end, either by managing your own team or
coordinating freelance professionals.
Responsibilities:
- Manage full project lifecycle (planning → delivery)
- Coordinate developers, designers, and freelancers
- Define timelines, milestones, and deliverables
- Ensure quality and on-time delivery
- Communicate directly with stakeholders
Requirements:
- Proven experience in web project management
- Ability to work independently or lead a team
- Experience working with freelancers
- Strong organizational and communication skills
- Basic understanding of crypto / Web3
Compensation:
- Starting from $3000/month
- Paid in crypto (optional)
- Long-term collaboration opportunity
What we offer:
- Fully remote position
- Continuous flow of projects
- Opportunity to grow within the crypto space
Important:
We are looking for someone who can deliver complete turnkey projects with high quality and within
deadlines.
Payment in Crypto
Harshvardhan Bisht
Startup
Chamoli Gopeshwar, India
Chamoli Gopeshwar, India
Part time
Office
Thank you for giving me the job. If I get a job in the future, I will get a chance to gain experience of working in the world. Thank you.
Payment in Crypto
Ment Tech
Senior Software Engineer (Blockchain)
Mumbai, India +3
Mumbai, India +3
Full time
Remote
About MentTech
MentTech is a forward-thinking technology company dedicated to transforming how mentoring and learning are delivered in the digital age. By combining advanced tools, intelligent systems, and a human-first approach, MentTech helps individuals, teams, and organizations harness the power of mentorship to unlock potential, build skills, and achieve lasting growth.
The Role
We are seeking a Smart Contract Developer responsible for ensuring that game listings within MentTech work properly and ensuring compliance with all game store policies.
Key Responsibilities:
• Architect, implement, and deploy secure smart contracts for an on-chain Play-to-Earn GameFi ecosystem
• Lead contract design decisions with a focus on robustness, auditability, gas efficiency, and resilience to attack vectors
• Mentor/junior developers: perform code reviews, establish standards, best practices in security & testing
• Collaborate cross-functionally with game designers, backend, QA, and security teams to align smart contract features with product roadmap
Qualifications:
• 2+ years hands‐on experience developing & deploying smart contracts (Solidity / EVM or equivalent) in production environments
• Track record of writing secure contracts, familiarity with common vulnerabilities (reentrancy, integer over/underflow, front-running, flash loans, etc.)
• Experience with audits, formal verification, fuzz testing, or other advanced contract assurance methods
• Strong test suite / CI workflow skills; comfortable using tools like Hardhat, Foundry, Truffle etc.
• Solid understanding of GameFi mechanics and how on-chain economics work
Bonus Points:
• Experience on multiple EVM chains or Layer-2 / sidechains
• Knowledge of cross-chain bridges, oracles, NFTs, tokenomics design
• Contributions to open-source security tooling or prior audit reports or published code you’re proud of
Why join MentTech?
At MentTech, we cultivate a culture of flexibility, autonomy, and the freedom to make a real impact on the broader Web3 ecosystem. Experience the advantages of a fully remote working environment where your expertise and contributions are rewarded with competitive compensation tailored to your role and project influence.
Ment Tech Labs
• Employee Equity & Incentives: Unlock future growth with equity and other potential incentives.
• Entrepreneurial Culture: Join a collaborative environment where we innovate together as partners.
• Cutting-edge Innovation: Work at the forefront of gaming and blockchain.
• Key Strategic Projects: Be part of transformative initiatives that are redefining the gaming landscape.
• Remote Flexibility: Enjoy a truly flexible, fully remote work setup that supports your lifestyle.
• Talented Team: Collaborate with a team of passionate, driven, and skilled professionals.
• Community Impact: Contribute to the growth and success of the Web3 and gaming communities.
• Flexible Payment Options: Receive payments in crypto or fiat, tailored to your preference.
• Growth Opportunities: Access valuable learning experiences and development paths.
MentTech Labs, Inc. is an equal opportunities workplace that doesn’t discriminate based on race, ethnicity, gender, ancestry, national origin, religion, sex, sexual orientation, gender identity, age disability, veteran status, genetic information, marital status, or any other legally protected status.
MentTech is a forward-thinking technology company dedicated to transforming how mentoring and learning are delivered in the digital age. By combining advanced tools, intelligent systems, and a human-first approach, MentTech helps individuals, teams, and organizations harness the power of mentorship to unlock potential, build skills, and achieve lasting growth.
The Role
We are seeking a Smart Contract Developer responsible for ensuring that game listings within MentTech work properly and ensuring compliance with all game store policies.
Key Responsibilities:
• Architect, implement, and deploy secure smart contracts for an on-chain Play-to-Earn GameFi ecosystem
• Lead contract design decisions with a focus on robustness, auditability, gas efficiency, and resilience to attack vectors
• Mentor/junior developers: perform code reviews, establish standards, best practices in security & testing
• Collaborate cross-functionally with game designers, backend, QA, and security teams to align smart contract features with product roadmap
Qualifications:
• 2+ years hands‐on experience developing & deploying smart contracts (Solidity / EVM or equivalent) in production environments
• Track record of writing secure contracts, familiarity with common vulnerabilities (reentrancy, integer over/underflow, front-running, flash loans, etc.)
• Experience with audits, formal verification, fuzz testing, or other advanced contract assurance methods
• Strong test suite / CI workflow skills; comfortable using tools like Hardhat, Foundry, Truffle etc.
• Solid understanding of GameFi mechanics and how on-chain economics work
Bonus Points:
• Experience on multiple EVM chains or Layer-2 / sidechains
• Knowledge of cross-chain bridges, oracles, NFTs, tokenomics design
• Contributions to open-source security tooling or prior audit reports or published code you’re proud of
Why join MentTech?
At MentTech, we cultivate a culture of flexibility, autonomy, and the freedom to make a real impact on the broader Web3 ecosystem. Experience the advantages of a fully remote working environment where your expertise and contributions are rewarded with competitive compensation tailored to your role and project influence.
Ment Tech Labs
• Employee Equity & Incentives: Unlock future growth with equity and other potential incentives.
• Entrepreneurial Culture: Join a collaborative environment where we innovate together as partners.
• Cutting-edge Innovation: Work at the forefront of gaming and blockchain.
• Key Strategic Projects: Be part of transformative initiatives that are redefining the gaming landscape.
• Remote Flexibility: Enjoy a truly flexible, fully remote work setup that supports your lifestyle.
• Talented Team: Collaborate with a team of passionate, driven, and skilled professionals.
• Community Impact: Contribute to the growth and success of the Web3 and gaming communities.
• Flexible Payment Options: Receive payments in crypto or fiat, tailored to your preference.
• Growth Opportunities: Access valuable learning experiences and development paths.
MentTech Labs, Inc. is an equal opportunities workplace that doesn’t discriminate based on race, ethnicity, gender, ancestry, national origin, religion, sex, sexual orientation, gender identity, age disability, veteran status, genetic information, marital status, or any other legally protected status.
Payment in Crypto
Michael Har
Junior / Middle Metaverse Developer (Unity / Web3 / VR)
Manzhouli, China
Manzhouli, China
Full time
Remote
We are looking for a Metaverse Developer to help build interactive virtual environments and immersive digital experiences. The role involves developing 3D worlds, integrating Web3 technologies, and working with modern tools for real-time applications.
You will work with Unity, WebGL, and blockchain technologies to create engaging metaverse features and optimize them for performance across different devices. The developer will collaborate with designers and backend engineers to deliver scalable and stable products.
Requirements include experience with Unity and C#, understanding of 3D development, Web3 or blockchain basics, and familiarity with Git and API integration. Experience with VR/AR, NFTs, or multiplayer systems is a plus.
We offer remote work, flexible hours, crypto payments, and the opportunity to build innovative metaverse products.
You will work with Unity, WebGL, and blockchain technologies to create engaging metaverse features and optimize them for performance across different devices. The developer will collaborate with designers and backend engineers to deliver scalable and stable products.
Requirements include experience with Unity and C#, understanding of 3D development, Web3 or blockchain basics, and familiarity with Git and API integration. Experience with VR/AR, NFTs, or multiplayer systems is a plus.
We offer remote work, flexible hours, crypto payments, and the opportunity to build innovative metaverse products.
Payment in Crypto