Staff Cloud Security Engineer
Status
Paris, France
Full time
Hybrid
Compensation is not specified
Role
Security Engineer
Description
Founded in 2014, a global platform focusing on digital assets and Web3 aims to enhance accessibility and security for all individuals worldwide. Over 15% of the globe's crypto assets are safeguarded by the innovative Ledger Nanos. The company operates from various locations including Paris, Vierzon, the UK, US, Switzerland, and Singapore, with a dedicated team of over 600 professionals striving to offer products and services that empower individuals and companies to securely engage with crypto assets. Ledger's hardware wallet line has already successfully sold over 5 million units across 180 countries.
At the company, core values such as Pragmatism, Audacity, Commitment, Trust, and Transparency define the unique culture. The hired individual will collaborate with the Cyber Security team and be responsible for driving the cybersecurity transformation. This involves implementing secure development practices, ensuring application security through automated scanning, and close collaboration with Infrastructure, Engineering, and Product Security teams.
The ideal candidate should be well-versed in cybersecurity, possess a passion for cloud technology security, demonstrate autonomy in work, and exhibit enthusiasm for suggesting enhancements to fortify Ledger's application, infrastructure, and service security. Excitement for the Web3 space and expertise in hardware wallets are advantageous qualities desired in applicants.
Responsibilities:
- Collaborate with Infrastructure, Engineering, and Product Security teams to integrate secure practices into delivery plans, detect and mitigate security vulnerabilities early on.
- Work closely with the Product Security team to provide automation and tooling for product security integration within the CI/CD pipeline.
- Champion proactive security measures like penetration testing, vulnerability assessments, and Infrastructure Security (IaC) code reviews to ensure Ledger's platforms and applications are secure.
- Contribute to designing and implementing robust security architectures, emphasizing risk assessment from inception.
- Serve as the primary point of contact for security incidents, ensuring timely responses, effective mitigation, and thorough post-incident analyses.
- Drive the adoption of DevSecOps culture, best practices, and methodologies throughout the organization for continual security advancement.
Requirements:
- At least 5 years of experience in DevSecOps, automation, security assessment, and cloud-native environments.
- Minimum of 8 years of experience in information security.
- Proficiency in Unix/Linux systems, Git, Python, Terraform, Kubernetes, AWS cloud technologies, CI/CD tools, and configuration management.
- Hands-on experience with security tool deployment, monitoring, and incident response.
- Strong cross-functional collaboration skills to work effectively with diverse teams and stakeholders.
- Excellent verbal and written communication abilities.
- Demonstrated ability to work autonomously, handle ambiguity, and thrive in high-pressure situations.
Benefits:
- Equity options to enable employees to share in the company's success.
- Hybrid work policy for flexibility.
- Annual company events and social gatherings for team bonding.
- Comprehensive health insurance covering medical, dental, and vision care.
- Personal development opportunities, coaching, and fitness partnerships.
- Five weeks of paid leave annually, plus national holidays and RTT days.
- Access to top-quality office equipment and gadgets, including Apple products.
- Transportation reimbursement and employee discounts on company products.
The company is an equal opportunity employer dedicated to fostering diversity and inclusivity across all aspects, 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
SADR B
Founding Technical Partners for Oferli – Elite Web & Mobile Development Team🌐
Remote, USA
Remote, USA
Part time
Remote
I am Sadr, CEO of Oferli. We are building a high-performance, elite technical team, and I am looking for 5 to 10 dedicated founding technical partners to join me in this mission.
The Vision:
Oferli is a 100% decentralized ecosystem. While we are rooted in Web3, our expertise spans across professional web and mobile application development. We are not just another agency; we are crafting the next generation of digital solutions. Our goal is to set a new standard for excellence, transparency, and decentralization.
What I am looking for:
I am building a professional, senior-level "Elite Team." I am looking for partners who are truly passionate about the vision—not just short-term gains. By combining our individual expertise and portfolios, we will establish Oferli’s collective professional reputation.
Requirements:
Proven Expertise: You must be a senior-level professional. Please provide your portfolio showcasing your best work in web and mobile development.
Commitment: This is a founding partnership. We are looking for those who believe in the mission and are ready to tackle complex challenges together.
Professionalism: We operate with high standards. Communication and efficiency are key.
How We Work:
Collaboration: We use professional, secure channels for all communications. Qualified candidates will be contacted via email to be invited to our private workspace on Notion to align on our roadmap and launch our upcoming projects.
Decentralized Operations: We leverage Web3 tools for collaboration and compensation, maintaining a fully decentralized environment.
Growth: We are launching with a core team of at least 5 founding partners, scaling to 10, to deliver high-impact results for our clients.
Application Process:
If you are a senior professional ready to build a world-class, decentralized ecosystem, apply here on LaborX. Qualified candidates will be contacted via email for further professional vetting and onboarding.
Let’s build the future, together.
Sadr B
CEO, Oferli
The Vision:
Oferli is a 100% decentralized ecosystem. While we are rooted in Web3, our expertise spans across professional web and mobile application development. We are not just another agency; we are crafting the next generation of digital solutions. Our goal is to set a new standard for excellence, transparency, and decentralization.
What I am looking for:
I am building a professional, senior-level "Elite Team." I am looking for partners who are truly passionate about the vision—not just short-term gains. By combining our individual expertise and portfolios, we will establish Oferli’s collective professional reputation.
Requirements:
Proven Expertise: You must be a senior-level professional. Please provide your portfolio showcasing your best work in web and mobile development.
Commitment: This is a founding partnership. We are looking for those who believe in the mission and are ready to tackle complex challenges together.
Professionalism: We operate with high standards. Communication and efficiency are key.
How We Work:
Collaboration: We use professional, secure channels for all communications. Qualified candidates will be contacted via email to be invited to our private workspace on Notion to align on our roadmap and launch our upcoming projects.
Decentralized Operations: We leverage Web3 tools for collaboration and compensation, maintaining a fully decentralized environment.
Growth: We are launching with a core team of at least 5 founding partners, scaling to 10, to deliver high-impact results for our clients.
Application Process:
If you are a senior professional ready to build a world-class, decentralized ecosystem, apply here on LaborX. Qualified candidates will be contacted via email for further professional vetting and onboarding.
Let’s build the future, together.
Sadr B
CEO, Oferli
Payment in Crypto
Marcus Lindberg
Senior Blockchain Engineer - Low-Latency Execution Infrastructure (HyperEVM / Hyperliquid)
Full time
Remote
we’re looking for a senior blockchain engineer to build low-latency execution infrastructure around hyperevm and hyperliquid-related trading systems.
this is not a frontend or dapp role. the focus is on real-time execution systems, chain-native infrastructure, and market-aware backend engineering where latency, ordering, and state correctness directly impact execution outcomes.
you will work on systems that operate under noisy, adversarial, and highly dynamic conditions, including delayed or missing websocket events, rpc inconsistencies, transaction lifecycle complexity, state desynchronization, retries, and recovery logic.
core responsibilities include building and maintaining realtime blockchain data pipelines, websocket and rpc streaming systems, execution orchestration layers, liquidity-aware routing logic, transaction lifecycle management, and integration with orderbook and market data systems.
we are specifically looking for engineers who think in systems rather than features. meaning understanding how data flows through pipelines, how state evolves over time, how failures propagate, and how to design systems that recover automatically without manual intervention.
areas of work include:
- realtime blockchain data ingestion
- mempool-aware execution flows
- transaction lifecycle handling
- execution sequencing and routing
- websocket and rpc infrastructure
- state synchronization systems
- liquidity and orderbook integration
- performance and latency optimization
you should be comfortable working with distributed systems, asynchronous event processing, and latency-sensitive backend architectures.
strong experience in one or more of the following areas is highly relevant:
- exchange infrastructure
- trading systems
- execution engines
- blockchain indexers
- realtime event systems
- arbitrage systems
- rpc/node infrastructure
- defi backend systems
- low-latency backend engineering
preferred technical stack:
- typescript / node.js
- go
- rust
- python
- postgres
- clickhouse
- redis
- kafka or similar messaging systems
- docker
- linux environments
- evm rpc internals
- websocket infrastructure
ecosystem familiarity:
- ethereum, arbitrum, base, optimism, bsc
- hyperliquid / hyperevm
- foundry
- ethers.js / viem
- geth / erigon / nethermind
- dex and amm mechanics
- liquidity math, slippage, gas strategy, routing logic
this role is not suitable for:
- frontend-only developers
- nft or basic dapp experience only
- tutorial-level web3 developers
- candidates without production systems experience
we value engineers who have built real systems where correctness, latency, and reliability matter under load. we care less about buzzwords and more about concrete systems you have personally built and operated.
ideal candidates can clearly explain:
- system architecture decisions
- bottlenecks and tradeoffs
- failure modes and recovery strategies
- latency considerations in real systems
- production debugging experience
working style:
- remote
- async-first
- low bureaucracy
- high ownership
- engineering-driven team
- direct technical communication
we strongly prefer practical engineering depth over polished presentation. if you have built or worked on systems involving realtime data, trading infrastructure, blockchain execution, or latency-sensitive backend systems, please include details of those systems when applying.
Payment in Crypto
Сrypto.com
Trading Support Analyst
Hong Kong
Hong Kong
Full time
Hybrid
Trading team: The team focuses on creating and managing quantitative trading strategies, covering prediction markets, equity markets, and crypto markets. We are in search of a skilled individual for the role of Trading Operations & Support Analyst. This position involves providing critical support for live systematic trading activities, ensuring the smooth functioning of daily operations, and enhancing the dependability and efficiency of our trading systems and procedures.
Responsibilities:
Monitor various aspects of live trading systems such as strategies, orders, positions, P&L, and risk.
Serve as the initial point of contact for trading, execution, exchange connectivity, and production challenges.
Investigate and effectively resolve order-related, position-based, P&L discrepancies, and trading-system exceptions.
Collaborate closely with traders, quantitative developers, exchanges, brokers, and other relevant parties to address live trading issues.
Assist in strategy deployments, system updates, testing, and changes in production environments.
Keep track of exchange and market events, outages, connectivity problems, and other operational risks.
Utilize trading and operational metrics for analysis, aiming to detect issues and enhance processes.
Develop tools and automation solutions to enhance monitoring, reconciliation, reporting, and trading operations.
Establish and enforce operational procedures and controls for production trading.
Contribute to providing local trading coverage, including participation in rotating weekend coverage.
Requirements:
Possess 3+ years of experience in electronic trading, trade support, trading operations, production support, or a similar field.
Comprehensive understanding of electronic trading, order lifecycle, positions, P&L, and risk management.
Ability to effectively troubleshoot issues in a fast-paced production environment.
Proficiency in Python or similar scripting languages; familiarity with SQL is desirable.
Experience handling extensive trading or market datasets.
Strong analytical, communication, and problem-solving capabilities.
Hold a Bachelor's degree in Computer Science, Engineering, Mathematics, Finance, or another quantitative discipline, or possess equivalent relevant experience.
Preferred:
Prior experience supporting systematic, algorithmic, or market-making trading.
Familiarity with prediction markets, equities, crypto, futures, options, or other derivatives.
Exposure to exchange APIs, FIX, order-book data, or real-time trading systems.
Our recruitment team may utilize artificial intelligence tools to evaluate applications more efficiently. This software aids in assessing qualifications but does not supersede human judgment regarding hiring decisions. For additional information on data processing, please reach out to us directly.
Responsibilities:
Monitor various aspects of live trading systems such as strategies, orders, positions, P&L, and risk.
Serve as the initial point of contact for trading, execution, exchange connectivity, and production challenges.
Investigate and effectively resolve order-related, position-based, P&L discrepancies, and trading-system exceptions.
Collaborate closely with traders, quantitative developers, exchanges, brokers, and other relevant parties to address live trading issues.
Assist in strategy deployments, system updates, testing, and changes in production environments.
Keep track of exchange and market events, outages, connectivity problems, and other operational risks.
Utilize trading and operational metrics for analysis, aiming to detect issues and enhance processes.
Develop tools and automation solutions to enhance monitoring, reconciliation, reporting, and trading operations.
Establish and enforce operational procedures and controls for production trading.
Contribute to providing local trading coverage, including participation in rotating weekend coverage.
Requirements:
Possess 3+ years of experience in electronic trading, trade support, trading operations, production support, or a similar field.
Comprehensive understanding of electronic trading, order lifecycle, positions, P&L, and risk management.
Ability to effectively troubleshoot issues in a fast-paced production environment.
Proficiency in Python or similar scripting languages; familiarity with SQL is desirable.
Experience handling extensive trading or market datasets.
Strong analytical, communication, and problem-solving capabilities.
Hold a Bachelor's degree in Computer Science, Engineering, Mathematics, Finance, or another quantitative discipline, or possess equivalent relevant experience.
Preferred:
Prior experience supporting systematic, algorithmic, or market-making trading.
Familiarity with prediction markets, equities, crypto, futures, options, or other derivatives.
Exposure to exchange APIs, FIX, order-book data, or real-time trading systems.
Our recruitment team may utilize artificial intelligence tools to evaluate applications more efficiently. This software aids in assessing qualifications but does not supersede human judgment regarding hiring decisions. For additional information on data processing, please reach out to us directly.
Wintermute
Infrastructure Engineer
Singapore +1
Singapore +1
Full time
Hybrid
About Wintermute
Wintermute is a technology unicorn and a major player in algorithmic trading, specializing in digital assets. The company offers liquidity on various cryptocurrency exchanges and trading platforms, as well as OTC trading solutions. Additionally, Wintermute supports blockchain projects and financial institutions entering the crypto space. The Wintermute Ventures arm invests in early-stage DeFi projects.
Founded in 2017, Wintermute blends the technology standards of high-frequency trading firms with the innovative and entrepreneurial culture of tech startups. The company believes in the potential of blockchain, takes a long-term view on the digital asset market, and aims to lead in building an innovative and compliant market.
About the Role
This position is a key technical role within the Infrastructure Engineering team at Wintermute. The role involves maintaining, optimizing, and scaling a mixed environment spanning physical and virtual computing landscapes. The main responsibilities include overseeing and enhancing server and network infrastructure, offering high-level technical support for systems, and driving automation setups.
We are seeking a proactive infrastructure professional who can take charge of our computing environment. In this role, you will collaborate with senior engineers to scale systems, develop automation solutions (especially in Python), and adapt to the evolving needs of the business. Success in this role involves maintaining, troubleshooting, and enhancing networks, routing protocols, and computing systems.
Wintermute provides ample opportunities for individuals to enhance their skills in automation and network infrastructure engineering.
Hard Skills Requirements:
Problem-Solving & Agility: Ability to find optimal solutions for various problems, ranging from data center connectivity management to hardware troubleshooting.
Network & Data Centre Foundations: Solid grasp of data center connectivity, structured cabling, and core TCP/IP networking concepts.
Cisco Networking: Hands-on experience with configuring, managing, and troubleshooting Cisco switches.
OS & Hardware Expertise: Proficient in server hardware, network appliances, server OS (specifically Linux), and troubleshooting network infrastructure issues.
Experience: Minimum of 5 years in systems administration, network infrastructure engineering, or related roles.
Network Troubleshooting: Experience diagnosing network performance issues using tools like Wireshark and traceroute.
Hardware Lifecycle: Ability to analyze and resolve complex hardware failures and performance bottlenecks.
Version Control: Familiarity with Git workflow.
Team Collaboration: Ability to work effectively as part of a team supporting production systems.
Performance Management: Experience with hardware/network monitoring tools and performance tuning.
Professional Communication: Strong communication skills in technical interactions.
Organization: Strong organizational skills and attention to detail.
Flexibility & Support: Availability for weekend and evening shifts and out-of-business-hours support when needed.
Nice-to-Have Skills:
Security & Firewalls: Experience with enterprise firewalls and ACLs.
Routing Protocols: Basic familiarity with routing protocols like BGP and OSPF.
Server Administration: Knowledge of enterprise Linux server environments and automated deployment tools.
Automation: Experience scripting in Python for network administration tasks.
Why Join Our Team:
Work at a top algorithmic trading firm.
Engaging projects with accelerated responsibilities.
Vibrant working culture with various team activities.
Offices in central London & Singapore with amenities.
Great company culture with a startup vibe.
Competitive compensation with perks like pension and health insurance.
AI tools may be used in parts of the hiring process to support recruitment efforts, but final decisions are made by humans. Contact us for more information on how data is processed.
Wintermute is a technology unicorn and a major player in algorithmic trading, specializing in digital assets. The company offers liquidity on various cryptocurrency exchanges and trading platforms, as well as OTC trading solutions. Additionally, Wintermute supports blockchain projects and financial institutions entering the crypto space. The Wintermute Ventures arm invests in early-stage DeFi projects.
Founded in 2017, Wintermute blends the technology standards of high-frequency trading firms with the innovative and entrepreneurial culture of tech startups. The company believes in the potential of blockchain, takes a long-term view on the digital asset market, and aims to lead in building an innovative and compliant market.
About the Role
This position is a key technical role within the Infrastructure Engineering team at Wintermute. The role involves maintaining, optimizing, and scaling a mixed environment spanning physical and virtual computing landscapes. The main responsibilities include overseeing and enhancing server and network infrastructure, offering high-level technical support for systems, and driving automation setups.
We are seeking a proactive infrastructure professional who can take charge of our computing environment. In this role, you will collaborate with senior engineers to scale systems, develop automation solutions (especially in Python), and adapt to the evolving needs of the business. Success in this role involves maintaining, troubleshooting, and enhancing networks, routing protocols, and computing systems.
Wintermute provides ample opportunities for individuals to enhance their skills in automation and network infrastructure engineering.
Hard Skills Requirements:
Problem-Solving & Agility: Ability to find optimal solutions for various problems, ranging from data center connectivity management to hardware troubleshooting.
Network & Data Centre Foundations: Solid grasp of data center connectivity, structured cabling, and core TCP/IP networking concepts.
Cisco Networking: Hands-on experience with configuring, managing, and troubleshooting Cisco switches.
OS & Hardware Expertise: Proficient in server hardware, network appliances, server OS (specifically Linux), and troubleshooting network infrastructure issues.
Experience: Minimum of 5 years in systems administration, network infrastructure engineering, or related roles.
Network Troubleshooting: Experience diagnosing network performance issues using tools like Wireshark and traceroute.
Hardware Lifecycle: Ability to analyze and resolve complex hardware failures and performance bottlenecks.
Version Control: Familiarity with Git workflow.
Team Collaboration: Ability to work effectively as part of a team supporting production systems.
Performance Management: Experience with hardware/network monitoring tools and performance tuning.
Professional Communication: Strong communication skills in technical interactions.
Organization: Strong organizational skills and attention to detail.
Flexibility & Support: Availability for weekend and evening shifts and out-of-business-hours support when needed.
Nice-to-Have Skills:
Security & Firewalls: Experience with enterprise firewalls and ACLs.
Routing Protocols: Basic familiarity with routing protocols like BGP and OSPF.
Server Administration: Knowledge of enterprise Linux server environments and automated deployment tools.
Automation: Experience scripting in Python for network administration tasks.
Why Join Our Team:
Work at a top algorithmic trading firm.
Engaging projects with accelerated responsibilities.
Vibrant working culture with various team activities.
Offices in central London & Singapore with amenities.
Great company culture with a startup vibe.
Competitive compensation with perks like pension and health insurance.
AI tools may be used in parts of the hiring process to support recruitment efforts, but final decisions are made by humans. Contact us for more information on how data is processed.
Ubiminds
Solutions Developer (578)
Brazil
Brazil
Full time
Remote
About the opportunity:
Build, set up, and implement AI assistants, agents, and intelligent workflows for practical use in enterprise applications aligned with US Central-time.
About our client:
Our client focuses on industrial process control and automation technology, aiding manufacturers in enhancing performance with a strong emphasis on relationships and top-tier talent.
Responsibilities:
Transform architectural blueprints into functional solutions, encompassing AI assistants, agents, intelligent workflows, automations, and low-code applications.
Configure various elements in Copilot Studio, Power Automate, Power Apps, and Agentforce such as prompts, instructions, connectors, permissions, and more.
Integrate solutions with major platforms like Microsoft 365, Salesforce, and ERP systems.
Develop prototypes and proofs of concept for assessment alongside architects and client teams.
Perform testing against predefined criteria to ensure accuracy, reliability, security, performance, among others.
Prepare solutions for production including deployment, documentation, monitoring, and support transition.
Enhance and resolve live solutions based on user feedback and data analysis.
Create technical documents, guides, and reusable components.
Engage in planning and client sessions periodically, reporting progress monthly.
Requirements (must-haves):
3 to 6 years of experience in delivering business applications or automation solutions.
Proficiency in Power Platform components, especially Power Automate and Power Apps.
Experience in building and deploying agents, copilots, or intelligent workflows.
Familiarity with generative AI behavior and integration fundamentals.
Knowledge of source control, ALM, and deployment pipelines.
Strong English proficiency for client interactions and documentation.
Bonus points (nice-to-haves):
Relevance certification such as PL-400, PL-200, etc.
Scripting skills in various languages like Python, JavaScript, PowerShell, or C#.
Exposure to Salesforce or industrial automation environments.
Enterprise ERP integration experience is a plus.
Perks & benefits:
Equipment provided for work.
Full back-office support for legal, accounting, HR, and delivery functions.
Mentorship for career and cultural adaptation.
Free English lessons offered.
Referral bonus scheme available.
Remote work with office access.
Hiring Process:
Initial interview with Tech Recruiter with possible AI assessment.
Followed by client-specific interview stages.
Offer presentation.
Onboarding supervised by Ubiminds support team.
Artificial intelligence may be utilized in parts of the recruitment process to aid in application reviews and assessments. Final recruitment decisions are made by humans. For further details on data processing, please reach out to us.
Build, set up, and implement AI assistants, agents, and intelligent workflows for practical use in enterprise applications aligned with US Central-time.
About our client:
Our client focuses on industrial process control and automation technology, aiding manufacturers in enhancing performance with a strong emphasis on relationships and top-tier talent.
Responsibilities:
Transform architectural blueprints into functional solutions, encompassing AI assistants, agents, intelligent workflows, automations, and low-code applications.
Configure various elements in Copilot Studio, Power Automate, Power Apps, and Agentforce such as prompts, instructions, connectors, permissions, and more.
Integrate solutions with major platforms like Microsoft 365, Salesforce, and ERP systems.
Develop prototypes and proofs of concept for assessment alongside architects and client teams.
Perform testing against predefined criteria to ensure accuracy, reliability, security, performance, among others.
Prepare solutions for production including deployment, documentation, monitoring, and support transition.
Enhance and resolve live solutions based on user feedback and data analysis.
Create technical documents, guides, and reusable components.
Engage in planning and client sessions periodically, reporting progress monthly.
Requirements (must-haves):
3 to 6 years of experience in delivering business applications or automation solutions.
Proficiency in Power Platform components, especially Power Automate and Power Apps.
Experience in building and deploying agents, copilots, or intelligent workflows.
Familiarity with generative AI behavior and integration fundamentals.
Knowledge of source control, ALM, and deployment pipelines.
Strong English proficiency for client interactions and documentation.
Bonus points (nice-to-haves):
Relevance certification such as PL-400, PL-200, etc.
Scripting skills in various languages like Python, JavaScript, PowerShell, or C#.
Exposure to Salesforce or industrial automation environments.
Enterprise ERP integration experience is a plus.
Perks & benefits:
Equipment provided for work.
Full back-office support for legal, accounting, HR, and delivery functions.
Mentorship for career and cultural adaptation.
Free English lessons offered.
Referral bonus scheme available.
Remote work with office access.
Hiring Process:
Initial interview with Tech Recruiter with possible AI assessment.
Followed by client-specific interview stages.
Offer presentation.
Onboarding supervised by Ubiminds support team.
Artificial intelligence may be utilized in parts of the recruitment process to aid in application reviews and assessments. Final recruitment decisions are made by humans. For further details on data processing, please reach out to us.