Principal Security Engineer, Security
Status
Phoenix, USA
Full time
Remote
Compensation is not specified
Role
Security Engineer
Description
Circle is a company in the fintech sector leading the charge in the development of the digital economy. They are dedicated to facilitating the seamless transfer of value across the globe in a cost-effective and efficient manner. By leveraging technologies such as USDC, a blockchain-based dollar, Circle empowers businesses and individuals to capitalize on the shifting landscape of digital finance.
What you'll be involved in:
At Circle, transparency and stability underpin every aspect of their operations. The organization is expanding into key global markets, driven by a culture of speed and efficiency. The core values of Multistakeholder, Mindfulness, Driven by Excellence, and High Integrity guide employees in a virtual environment where collaboration and innovation flourish.
What you'll be tasked with:
Circle is seeking a dynamic Principal Security Engineer specialized in Product and Blockchain Security to spearhead the implementation of cutting-edge technical strategies. Collaborating closely with various teams including Engineering, Infrastructure, and IT, you will contribute to fortifying the security posture of cloud operations, software development, and device management.
Responsibilities:
- Collaborate with product management and software engineering departments throughout the software development life cycle to ensure robust security implementations
- Conduct thorough security assessments on web3 and web2 applications using a blend of automated tools and manual intervention; oversee the resolution of identified vulnerabilities
- Propose enhancements to the codebase to mitigate security risks
- Automate security testing through continuous integration and continuous deployment pipelines
- Contribute to the formulation of secure coding standards based on real-world insights within Circle's ecosystem
- Research vulnerabilities specific to blockchain technologies and embed this intelligence into security protocols
- Act as a point of escalation for investigating security incidents and alerts
- Handle vulnerability disclosures related to Circle’s products and systems
- Coordinate with external vendors for conducting penetration tests and security-related projects
- Drive ongoing enhancements to the application security program
- Support parallel security initiatives such as threat modeling, vulnerability scanning, and audits
Core Values:
- Multistakeholder: Devotion to customers, shareholders, employees, and local communities
- Mindful: Valuing respect, active listening, and attention to detail
- Driven by Excellence: Fanatical pursuit of excellence, rejecting mediocrity, and fervently pursuing success
- High Integrity: Foster honest and open communication, maintain high ethical standards, and reject dishonesty and manipulation
Requirements:
- 7+ years of experience in cybersecurity roles
- 4+ years in a leadership role within cybersecurity
- Strong passion for ensuring software security
- Proficiency in penetration testing and knowledge of common attack methodologies
- Expertise in designing secure software features and automation of security protocols
- Experience with AWS and GCP cloud environments
- Familiarity with blockchain technologies like Ethereum, Bitcoin, Solana
- Understanding of public and private key cryptography
- Demonstrated ability to fortify software against common cyber threats
- Self-driven problem solver with a collaborative mindset
- Prior experience within financial services or fintech is desirable
- Bachelor's degree in a relevant field; equivalent experience considered
- Certifications such as CISSP, CEH are advantageous
- Experience with programming languages such as Solidity, Rust, Go, Python is beneficial
- Familiarity with JSON and blockchain languages
- Comfort in remote work environments and occasional travel readiness
Additional Information:
- Position offers day-one PERM sponsorship for suitable candidates
- Compensation based on relevant factors, starting from $200,000 - $257,500
- Additionally includes annual bonus, equity, medical benefits, 401(k), flexible vacation policy, paid sick leave, and holidays
- Circle is an equal opportunity employer committed to fostering diversity and nondiscrimination
Collections: Job , Requirements, Responsibilities, Additional Information, Core Values
Skills Required
Circle
Website
www.circle.comCompany size
Not specified
Location
United States
Description
Not specified
Status
George I
Game Studio Hiring: Full-Stack, Mobile & 3D Web Developers
Part time
Remote
About Us
We are an established game studio developing HeroWarrior, a Unity-based web battle game that has been in active development for three years. Our project is supported by GameWorld (Netherlands) and we're currently preparing for version 2.0 with an expanded development team.
Following strategic restructuring in 2022, we're now building a distributed team across Europe and seeking talented developers to join our long-term project.
Open Positions
We are actively recruiting for the following roles:
UI/UX Designer
Specialization in gaming interface design
Experience with Unity UI systems preferred
Full-Stack Developers
Backend and frontend development for web platform
Experience with game-related web services preferred
Mobile Developers
Native mobile app development
Cross-platform experience valued
Unity Developers
Gameplay mechanics implementation
3+ years Unity experience required
3D Web Developers
WebGL and Three.js expertise
Browser-based 3D rendering experience
hat We Offer
Project Commitment: We're seeking long-term partnerships, not short-term contractors. This is an opportunity to grow with an established project backed by industry partners.
Compensation Structure:
Flexible payment options: hourly rates, monthly retainers, or milestone-based compensation
Rates negotiable based on experience and role
Initial evaluation period followed by standard employment terms
Work Environment:
Remote-friendly distributed team
Collaborative development process
Opportunity to work on a commercially-backed game project
Application Requirements
Please submit the following:
Portfolio/Resume - Detailed work history and relevant projects
Rate Expectations - Your preferred compensation structure and rates
Code Samples - GitHub repository, portfolio links, or previous work examples
Availability - Expected start date and commitment level
Evaluation Process Acknowledgment - Confirmation of willingness to complete a brief technical assessment
Ideal Candidates
Demonstrated passion for game development
Strong technical skills in relevant technologies
Experience working on long-term projects
Collaborative mindset and professional communication
Interest in building innovative gaming experiences
Next Steps
We are moving quickly to fill these positions. Qualified candidates will be contacted within one week for initial discussions and technical evaluation.
To apply, please send your complete application materials to vlad@gameworldcompany.com
We are an established game studio developing HeroWarrior, a Unity-based web battle game that has been in active development for three years. Our project is supported by GameWorld (Netherlands) and we're currently preparing for version 2.0 with an expanded development team.
Following strategic restructuring in 2022, we're now building a distributed team across Europe and seeking talented developers to join our long-term project.
Open Positions
We are actively recruiting for the following roles:
UI/UX Designer
Specialization in gaming interface design
Experience with Unity UI systems preferred
Full-Stack Developers
Backend and frontend development for web platform
Experience with game-related web services preferred
Mobile Developers
Native mobile app development
Cross-platform experience valued
Unity Developers
Gameplay mechanics implementation
3+ years Unity experience required
3D Web Developers
WebGL and Three.js expertise
Browser-based 3D rendering experience
hat We Offer
Project Commitment: We're seeking long-term partnerships, not short-term contractors. This is an opportunity to grow with an established project backed by industry partners.
Compensation Structure:
Flexible payment options: hourly rates, monthly retainers, or milestone-based compensation
Rates negotiable based on experience and role
Initial evaluation period followed by standard employment terms
Work Environment:
Remote-friendly distributed team
Collaborative development process
Opportunity to work on a commercially-backed game project
Application Requirements
Please submit the following:
Portfolio/Resume - Detailed work history and relevant projects
Rate Expectations - Your preferred compensation structure and rates
Code Samples - GitHub repository, portfolio links, or previous work examples
Availability - Expected start date and commitment level
Evaluation Process Acknowledgment - Confirmation of willingness to complete a brief technical assessment
Ideal Candidates
Demonstrated passion for game development
Strong technical skills in relevant technologies
Experience working on long-term projects
Collaborative mindset and professional communication
Interest in building innovative gaming experiences
Next Steps
We are moving quickly to fill these positions. Qualified candidates will be contacted within one week for initial discussions and technical evaluation.
To apply, please send your complete application materials to vlad@gameworldcompany.com
Payment in Crypto
VaultChain
Assistant in Financial Technology and Trading Strategies (with Training)
Berlin, Germany
Berlin, Germany
Part time
Remote
Description
We are offering an opportunity to join our team and learn about cross-market trading strategies, focusing on identifying price differences of assets across multiple platforms. This role provides hands-on experience in financial technology, data analysis, and trading support.
As part of this position, you will:
Gain practical knowledge of market analysis and trading workflows
Learn how to recognize and evaluate opportunities across different platforms
Develop your skills in risk management and decision-making
Work with a mentor who will guide you step by step through the learning process
What we provide:
Comprehensive training program designed for beginners
Ongoing mentorship and professional support
Flexible schedule (approx. 1 hour a day required for study and practice)
Remote work setup with the possibility to grow into a larger role over time
This is a part-time, entry-level opportunity suitable for candidates with little or no prior experience. What matters most is your willingness to learn and apply new knowledge in practice.
Compensation: Competitive monthly pay structure with opportunities for progression as skills develop
We are offering an opportunity to join our team and learn about cross-market trading strategies, focusing on identifying price differences of assets across multiple platforms. This role provides hands-on experience in financial technology, data analysis, and trading support.
As part of this position, you will:
Gain practical knowledge of market analysis and trading workflows
Learn how to recognize and evaluate opportunities across different platforms
Develop your skills in risk management and decision-making
Work with a mentor who will guide you step by step through the learning process
What we provide:
Comprehensive training program designed for beginners
Ongoing mentorship and professional support
Flexible schedule (approx. 1 hour a day required for study and practice)
Remote work setup with the possibility to grow into a larger role over time
This is a part-time, entry-level opportunity suitable for candidates with little or no prior experience. What matters most is your willingness to learn and apply new knowledge in practice.
Compensation: Competitive monthly pay structure with opportunities for progression as skills develop
Сrypto.com
Head of Custody Security
Los Angeles, USA
Los Angeles, USA
Full time
Hybrid
Responsibilities
Conducting, designing, and executing security control testing for identity management, key management, and infrastructure (network and cloud) configurations.
Supporting client assurance activities, including addressing Requests for Proposals (RFPs), Requests for Information (RFIs), and Due Diligence Questionnaires (DDQs).
Identifying and analyzing trends in client inquiries, providing feedback to internal teams to enhance documentation and control readiness.
Performing security due diligence and continuous monitoring for Web3/blockchain vendors, evaluating their control maturity, reviewing SOC reports and security documentation, and identifying residual risks.
Facilitating external audit activities by coordinating walkthroughs, collecting evidence, and tracking responses.
Identifying and analyzing gaps in current and new processes, developing and tracking remediation recommendations to completion (e.g., onboarding flow).
Developing and maintaining understanding of applicable financial regulatory security requirements, ensuring alignment of controls.
Researching and sharing information on security best practices, emerging threats, and mitigation strategies with internal teams.
Evaluating and recommending next-generation security tools, automation, and technologies to strengthen overall security posture.
Reviewing blockchain network or protocol upgrades for potential security impacts on the platform.
Requirements
Minimum 8 years of relevant experience in security assurance, audit, compliance, or cloud security engineering.
Demonstrated experience in testing and validating security controls across IAM, key management, and network/cloud environments.
Solid understanding of Identity and Access Management (IAM) principles.
Knowledge of cryptographic key management, HSMs, and KMS systems.
Strong grasp of cloud and network security architecture and configuration.
Proven experience in supporting SOC 1, SOC 2, ISO 27001, PCI DSS, or similar external audits and assessments.
Exposure to major cloud platforms (AWS, GCP, Azure) and infrastructure-as-code.
Experience in preparing client assurance materials, RFP/RFI/DDQ responses, and evidence documentation.
Familiarity with blockchain platforms or digital asset custody systems is a plus.
Capability to work independently and under pressure.
Excellent verbal and written communication skills.
Pragmatic and solution-oriented approach, ability to balance security requirements with operational feasibility and business needs.
Salary: $190,000 - $230,000 a year
We may utilize artificial intelligence (AI) tools for parts of the hiring process, like reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you need more information about how your data is handled, please contact us.
Conducting, designing, and executing security control testing for identity management, key management, and infrastructure (network and cloud) configurations.
Supporting client assurance activities, including addressing Requests for Proposals (RFPs), Requests for Information (RFIs), and Due Diligence Questionnaires (DDQs).
Identifying and analyzing trends in client inquiries, providing feedback to internal teams to enhance documentation and control readiness.
Performing security due diligence and continuous monitoring for Web3/blockchain vendors, evaluating their control maturity, reviewing SOC reports and security documentation, and identifying residual risks.
Facilitating external audit activities by coordinating walkthroughs, collecting evidence, and tracking responses.
Identifying and analyzing gaps in current and new processes, developing and tracking remediation recommendations to completion (e.g., onboarding flow).
Developing and maintaining understanding of applicable financial regulatory security requirements, ensuring alignment of controls.
Researching and sharing information on security best practices, emerging threats, and mitigation strategies with internal teams.
Evaluating and recommending next-generation security tools, automation, and technologies to strengthen overall security posture.
Reviewing blockchain network or protocol upgrades for potential security impacts on the platform.
Requirements
Minimum 8 years of relevant experience in security assurance, audit, compliance, or cloud security engineering.
Demonstrated experience in testing and validating security controls across IAM, key management, and network/cloud environments.
Solid understanding of Identity and Access Management (IAM) principles.
Knowledge of cryptographic key management, HSMs, and KMS systems.
Strong grasp of cloud and network security architecture and configuration.
Proven experience in supporting SOC 1, SOC 2, ISO 27001, PCI DSS, or similar external audits and assessments.
Exposure to major cloud platforms (AWS, GCP, Azure) and infrastructure-as-code.
Experience in preparing client assurance materials, RFP/RFI/DDQ responses, and evidence documentation.
Familiarity with blockchain platforms or digital asset custody systems is a plus.
Capability to work independently and under pressure.
Excellent verbal and written communication skills.
Pragmatic and solution-oriented approach, ability to balance security requirements with operational feasibility and business needs.
Salary: $190,000 - $230,000 a year
We may utilize artificial intelligence (AI) tools for parts of the hiring process, like reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you need more information about how your data is handled, please contact us.
Wintermute
Infrastructure Support Engineer
London, UK
London, UK
Full time
Hybrid
About Wintermute
Wintermute is a prominent crypto-native algorithmic trading firm in the digital asset space. Our services include providing liquidity algorithmically on various cryptocurrency exchanges and trading platforms, offering OTC trading solutions, and supporting blockchain projects and financial institutions entering the crypto realm. Additionally, Wintermute Ventures invests in early-stage DeFi projects.
Established in 2017 by industry experts, Wintermute blends the technological standards of high-frequency trading firms in traditional markets with the innovative and entrepreneurial culture of tech startups. We have a deep-rooted belief in the transformative potential of blockchain technology, viewing digital assets not merely as another asset class but as a source of meaningful innovation. We maintain a long-term outlook on the digital asset market and assertively lead in creating an innovative and compliant market.
About the Role
This position primarily involves technical support functions within our systems administration department, focusing on the desktop environment and providing support for our automated setup. Candidates for this role should exhibit a sense of responsibility and passion for pursuing or advancing their careers in infrastructure. The position offers the opportunity to collaborate with and learn from senior technologists, enhancing automation skills, particularly proficiency in Python. Given the dynamic nature of our business, we seek individuals to help uphold our networks and computing environment.
Wintermute provides avenues for individuals to enhance their automation skills.
Hard Skills Requirements
Demonstrate the drive to identify optimal solutions for problems of varying complexity, spanning tasks from data center management to addressing desktop issues.
Proficient in PC hardware and computer internals troubleshooting, capable of resolving workstation OS (Linux), applications, peripherals, network, and audio-visual problems.
At least 2 years of prior experience in desktop support or a related field.
Able to analyze, troubleshoot, and resolve hardware failures effectively.
Practical knowledge of Linux command-line operations is essential.
Familiarity with Git and working experience in hardware monitoring and performance tuning.
Collaborative approach in a team environment supporting production, back office computing, and end-user assistance activities.
Skilled in maintaining professional interactions with users during face-to-face interactions, desk-side visits, inquiries, and status updates.
Energetic, adaptable, and able to thrive in a high-paced environment.
Exceptional organizational skills and meticulous attention to detail.
Educational background in computer science or IT field preferred.
Clear and concise communication skills.
Basic understanding of Data center connectivity and TCP/IP Networking.
Capable of lifting 40 – 50 pounds; willingness to work weekend and evening shifts as required.
Nice to Have Skills
Working knowledge of Linux servers, networking principles (DNS, DHCP, VLAN), and Python.
Reasons to Join Our Team
Contribute your skills to a globally recognized algorithmic trading firm.
Engage in challenging projects with increased responsibilities compared to traditional financial settings.
Enjoy a vibrant working culture with team activities, celebrations, gaming events, and company-wide team building exercises.
Embrace our inclusive company culture that is informal, non-hierarchical, ambitious, professional with a startup feel, collaborative, and entrepreneurial.
Performance-driven compensation structure providing substantial earning potential, along with standard perks such as pension and private health insurance.
Wintermute is a prominent crypto-native algorithmic trading firm in the digital asset space. Our services include providing liquidity algorithmically on various cryptocurrency exchanges and trading platforms, offering OTC trading solutions, and supporting blockchain projects and financial institutions entering the crypto realm. Additionally, Wintermute Ventures invests in early-stage DeFi projects.
Established in 2017 by industry experts, Wintermute blends the technological standards of high-frequency trading firms in traditional markets with the innovative and entrepreneurial culture of tech startups. We have a deep-rooted belief in the transformative potential of blockchain technology, viewing digital assets not merely as another asset class but as a source of meaningful innovation. We maintain a long-term outlook on the digital asset market and assertively lead in creating an innovative and compliant market.
About the Role
This position primarily involves technical support functions within our systems administration department, focusing on the desktop environment and providing support for our automated setup. Candidates for this role should exhibit a sense of responsibility and passion for pursuing or advancing their careers in infrastructure. The position offers the opportunity to collaborate with and learn from senior technologists, enhancing automation skills, particularly proficiency in Python. Given the dynamic nature of our business, we seek individuals to help uphold our networks and computing environment.
Wintermute provides avenues for individuals to enhance their automation skills.
Hard Skills Requirements
Demonstrate the drive to identify optimal solutions for problems of varying complexity, spanning tasks from data center management to addressing desktop issues.
Proficient in PC hardware and computer internals troubleshooting, capable of resolving workstation OS (Linux), applications, peripherals, network, and audio-visual problems.
At least 2 years of prior experience in desktop support or a related field.
Able to analyze, troubleshoot, and resolve hardware failures effectively.
Practical knowledge of Linux command-line operations is essential.
Familiarity with Git and working experience in hardware monitoring and performance tuning.
Collaborative approach in a team environment supporting production, back office computing, and end-user assistance activities.
Skilled in maintaining professional interactions with users during face-to-face interactions, desk-side visits, inquiries, and status updates.
Energetic, adaptable, and able to thrive in a high-paced environment.
Exceptional organizational skills and meticulous attention to detail.
Educational background in computer science or IT field preferred.
Clear and concise communication skills.
Basic understanding of Data center connectivity and TCP/IP Networking.
Capable of lifting 40 – 50 pounds; willingness to work weekend and evening shifts as required.
Nice to Have Skills
Working knowledge of Linux servers, networking principles (DNS, DHCP, VLAN), and Python.
Reasons to Join Our Team
Contribute your skills to a globally recognized algorithmic trading firm.
Engage in challenging projects with increased responsibilities compared to traditional financial settings.
Enjoy a vibrant working culture with team activities, celebrations, gaming events, and company-wide team building exercises.
Embrace our inclusive company culture that is informal, non-hierarchical, ambitious, professional with a startup feel, collaborative, and entrepreneurial.
Performance-driven compensation structure providing substantial earning potential, along with standard perks such as pension and private health insurance.
Сrypto.com
Head of Custody Security
Amsterdam, Netherlands
Amsterdam, Netherlands
Full time
Hybrid
Responsibilities
Plan, execute, and manage testing of security controls for identity management, key management, and network/cloud infrastructure.
Assist with client assurance tasks such as handling RFPs, RFIs, and DDQs.
Analyze customer inquiries, provide insights to internal teams for enhancing documentation and control readiness.
Conduct security assessments and continual monitoring of web3/blockchain vendors to evaluate control maturity and identify risks.
Coordinate external audit procedures including walkthroughs, evidence gathering, and response oversight.
Identify process gaps, develop remediation plans, and monitor progress to address deficiencies.
Stay informed on financial regulatory security requirements to ensure compliance of controls.
Share security best practices, emerging threats, and mitigation techniques with internal stakeholders.
Assess and recommend advanced security tools, automation, and technologies to improve overall security posture.
Evaluate potential security implications of blockchain network or protocol upgrades on the platform.
Requirements
Minimum of 8 years experience in security assurance, audit, compliance, or cloud security engineering.
Proficiency in testing security controls across IAM, key management, and network/cloud environments.
Strong understanding of Identity and Access Management (IAM) principles.
Familiarity with cryptographic key management, HSMs, and KMS systems.
Good knowledge of cloud and network security architecture and configurations.
Experience supporting external audits like SOC 1, SOC 2, ISO 27001, PCI DSS, or equivalent assessments.
Exposure to major cloud platforms (AWS, GCP, Azure) and infrastructure-as-code.
Ability to create client assurance materials, respond to RFP/RFI/DDQ, and maintain evidence documentation.
Knowledge of blockchain platforms or digital asset custody systems is a plus.
Capable of working independently and handling pressure effectively.
Excellent verbal and written communication skills.
Practical and solution-focused approach, able to balance security needs with operational feasibility and business requirements.
Plan, execute, and manage testing of security controls for identity management, key management, and network/cloud infrastructure.
Assist with client assurance tasks such as handling RFPs, RFIs, and DDQs.
Analyze customer inquiries, provide insights to internal teams for enhancing documentation and control readiness.
Conduct security assessments and continual monitoring of web3/blockchain vendors to evaluate control maturity and identify risks.
Coordinate external audit procedures including walkthroughs, evidence gathering, and response oversight.
Identify process gaps, develop remediation plans, and monitor progress to address deficiencies.
Stay informed on financial regulatory security requirements to ensure compliance of controls.
Share security best practices, emerging threats, and mitigation techniques with internal stakeholders.
Assess and recommend advanced security tools, automation, and technologies to improve overall security posture.
Evaluate potential security implications of blockchain network or protocol upgrades on the platform.
Requirements
Minimum of 8 years experience in security assurance, audit, compliance, or cloud security engineering.
Proficiency in testing security controls across IAM, key management, and network/cloud environments.
Strong understanding of Identity and Access Management (IAM) principles.
Familiarity with cryptographic key management, HSMs, and KMS systems.
Good knowledge of cloud and network security architecture and configurations.
Experience supporting external audits like SOC 1, SOC 2, ISO 27001, PCI DSS, or equivalent assessments.
Exposure to major cloud platforms (AWS, GCP, Azure) and infrastructure-as-code.
Ability to create client assurance materials, respond to RFP/RFI/DDQ, and maintain evidence documentation.
Knowledge of blockchain platforms or digital asset custody systems is a plus.
Capable of working independently and handling pressure effectively.
Excellent verbal and written communication skills.
Practical and solution-focused approach, able to balance security needs with operational feasibility and business requirements.