Infrastructure System Engineer

Paris, France
Full time
Compensation is not specified
Systems Engineer

We aim to democratize and safeguard digital assets worldwide. Join us in this endeavor.

Established in 2014, Ledger serves as the global hub for digital assets and Web3. With headquarters in Paris and Vierzon, and additional offices in the UK, US, Switzerland, and Singapore, Ledger employs over 550 professionals. The team works collectively to create and deliver a range of products and services enabling individuals and enterprises to securely purchase, store, exchange, grow, and oversee crypto assets. The Ledger hardware wallets have reached more than 5 million units sold across 180 countries.

At Ledger, we uphold values that shape our identity: Practicality, Boldness, Commitment, Trust, and Transparency. Discover more about our journey and ethos through our Origins video.

To facilitate our expanding enterprise, Ledger seeks a System Engineer for the Infrastructure Team in France who is passionate about high availability systems, monitoring, and automation, and eager to collaborate in a diverse, international setting.


  • Design, configure, and manage systems infrastructure encompassing core services, internal tools, monitoring solutions, and bare metal servers
  • Research, pilot, integrate and deploy new technologies and infrastructure solutions
  • Support the source code version management, continuous integration tools, and package management solutions
  • Precisely estimate system work packages within the infrastructure domain
  • Serve as an escalation point for systems delivery design or setup
  • Act as a key escalation point for platform remedies
  • Handle system incidents and problems resolution
  • Monitor, optimize, and troubleshoot hardware or software incidents and problems
  • Plan and implement security measures to safeguard data, software, and hardware
  • Configure, monitor, and maintain backup and replication routines, and strategize disaster recovery readiness
  • Maintain up-to-date documentation of Ledger's infrastructure systems

Required Skills:

  • Minimum 10 years of experience in Linux system administration and management within a high availability ecosystem
  • Proficiency in virtualization and containerization environments like K8s, Docker, Proxmox
  • Hands-on experience with configuration management tools such as Ansible, SaltStack, or Terraform
  • Familiarity with system monitoring tools, particularly Prometheus
  • Knowledge of encryption and PKI technologies
  • Self-driven, motivated, and autonomous
  • Effective communication and persuasion skills
  • Honest, realistic, and adept at creative problem solving, critically assessing solutions, and implementing business needs

Preferred Qualifications:

  • Experience in Public Cloud deployments on AWS
  • Understanding of application transport and network infrastructure protocols
  • Knowledge of data center operations or network devices is beneficial

Perks and Benefits:

  • Stock options to share in the company's success
  • Hybrid work policy for flexibility
  • Annual company outings and social events
  • Comprehensive health insurance coverage
  • Personal development, coaching, and fitness opportunities
  • Five weeks of paid leave per year, national holidays, and RTT days
  • Access to high-performance office equipment and gadgets
  • Transportation reimbursement
  • Employee discounts on all products

Ledger is an equal opportunity employer with a commitment to diversity and inclusion.

Skills Required
Company size
Not specified
United States
Ledger is a leader in security and infrastructure solutions for cryptocurrencies and blockchain applications. We are constantly looking for innovative, talented people to join our team.

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Director / Sr. Director of Ad Sales - Gaming
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About Brave
Brave is on a mission to protect the human right to privacy online. We’ve built a free web browser that blocks creepy ads and trackers by default, a private search engine with a truly independent index, a browser-native crypto wallet, and a private ad network (opt-in!) that directly rewards you for your attention. And we’re just getting started. Almost 70 million people have switched to Brave for a faster, more private web. Millions more switch every month.
The internet is a sea of ads, hackers, and echo chambers. Big Tech makes huge profits off our data and tells us what’s true and what’s not. Brave is fighting back. Join us!
Brave is looking for an experienced Ad Sales representative to join our US sales team. This is a role focused on finding and developing new client relationships to place ads within the Brave Ecosystem. This role also focuses on selling to the Gaming Industry and preferably candidates will have a strong understanding of the gaming market space with high level contacts at gaming publishers. 
Sell direct to client within the gaming vertical. (console, pc, and mobile games)
Agency sales where appropriate
Develop and refine Games Vertical GTM including defining prospects, sales collateral, positioning, & case studies.
Attend appropriate conferences including Gamescom & GDC
Own, maintain, and develop a pipeline of potential advertiser leads in priority verticals
Work cross-functionally with product, design, marketing, and account management as we develop and onboard partners
5-7+ years of business and advertising/digital media sales experience
Strong experience working within the Gaming Vertical
Current client direct relationships with key gaming partners
Demonstrated success in selling a variety of advertising products inclusive of search, custom media, and display.
Ability to structure and operate complex business deals
Highly organized in managing all aspects of the pre-sale, sale and working with client service teams regarding campaign maintenance and upsell opportunities
Experienced in executive-level presentations, both internally and externally
Ideal candidate will come from a leading gaming publisher or the owner of the gaming channel within a larger organization.
Working at Brave
Industry-leader in privacy, with a research and engineering team that’s innovating everyday to keep people safer online and beat Big Tech
Highly competitive salaries & benefits, and generous home-office stipends
Fully remote team (no office, no commute). Hybrid opportunity available if needed as well!
Welcoming, humble, ridiculously smart teammates, and a truly flat org structure
Opportunity to get in early at a hyper-growth company, and revolutionize the web
Oh, and did we mention Brendan, our CEO & co-founder, invented JavaScript?
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Senior Software Engineer, Java (FinCrime Prevention)

Austria +1
Austria +1
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Who we are

We are dedicated to simplifying wealth creation. Established in 2014 in Vienna, Austria by Eric Demuth, Paul Klanschek, and Christian Trummer, our mission is to empower individuals to achieve financial freedom by instilling confidence in their investment choices. Our user-friendly platform allows both novice and experienced investors to trade cryptocurrencies, crypto indices, stocks, precious metals, and commodities according to their preferences and budget, 24/7. With a global team operating across various time zones and cultures, we serve over 4 million customers, positioning us as a secure and innovative platform at the forefront of modern investing.

Headquartered in Austria with operations extending throughout Europe, our team is comprised of dynamic individuals who thrive on proactivity and collaboration, driving continuous innovation and growth within our industry. If you are driven to make a significant impact and welcome new challenges, come be a part of our transformative team.

Your responsibilities

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Writing well-structured and thoroughly tested code deployed within an event-driven microservices architecture

Contributing to technical discussions and knowledge-sharing across the team

Enhancing system performance and resilience through optimization strategies

Cultivating strong inter-team relationships and addressing technical challenges collaboratively


Extensive expertise in Java 11+ software development and best practices

Proficiency in both relational and non-relational databases, particularly Postgres and MongoDB

Demonstrated experience in building and maintaining high-performance REST APIs with an emphasis on optimization and scalability

Practical knowledge of message-oriented middleware like Apache Kafka and RabbitMQ within the context of event-driven microservices

Strong familiarity with CI/CD practices and hands-on experience with AWS, Terraform, and Kubernetes


Flexible hybrid work model offering Work From Anywhere days

Competitive compensation package inclusive of participation in our Bitpanda stock option plan

Comprehensive benefits package reflecting our adaptability-focused approach

Exclusive rewards for trading on the Bitpanda platform

Access to company-wide and team events, both virtual and on-site

Branded Bitpanda merchandise to customize your work environment

Above all, seize the opportunity to develop and evolve alongside Bitpanda’s journey towards becoming the premier investment platform in Europe.

At Bitpanda, we believe in creating an equitable and inclusive workplace that values trust and mutual respect. We are committed to fostering diversity by assembling a team with a broad range of backgrounds, perspectives, and skill sets.

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Berlin, Germany
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cLabs is currently in search of a Senior Distributed Systems Engineer to join the Blockchain Team. The team oversees the maintenance of Celo's blockchain node, which operates via a p2p network where validators achieve consensus on new blocks that are then synchronized and validated by all other nodes.

The node, which is a modified version of the go-ethereum software with unique features like the consensus engine, poses challenges in scaling the network, enhancing security, ensuring resilience, and introducing new functionalities exclusive to the Celo ecosystem, such as transaction fee payments with an ERC20 token at the node level.

Collaboration with various engineering teams at cLabs is key, including close work with the Primitives team for accessing smart contracts, aligning incentives for validators and nodes, and partnering with Developer Tools teams to enhance user and contributor experiences.

Key Responsibilities:

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Contribute to the development and optimization of the Celo blockchain client

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Create comprehensive documentation on Celo protocol specifics


Previous experience in blockchain development

Proficiency in Golang, preferably with knowledge of Geth, Optimism, Erigon, or similar Golang-based Ethereum clients

Expertise in designing distributed systems and development

Strong debugging skills and troubleshooting abilities

Excellent written and verbal communication skills

Strong work ethics and sense of responsibility

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cLabs, the organization behind Celo since 2017, prioritizes diversity in its workforce to build innovative and impactful products that address real-world challenges. As an equal opportunity employer, cLabs promotes diversity and inclusion and encourages applications from individuals of all backgrounds. Applicants requiring special accommodations during the interview process or website accessibility may reach out for confidential assistance.

Kindly include your name and preferred contact method in your request for accommodations, and cLabs will respond promptly.

Senior Architect - Middleware

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Hong Kong
Full time
Who We Are

"At OKX, we believe in a future shaped by technology. Established in 2017, OKX stands as a prominent cryptocurrency spot and derivatives exchange globally. By leveraging blockchain technology, we aim to transform the financial landscape by offering diverse and advanced products, solutions, and trading tools. With the trust of over 20 million users across 180 regions worldwide, OKX strives to offer an engaging platform that enables individuals to explore the world of crypto. Beyond our exceptional DeFi exchange, OKX also provides users with OKX Insights, a research division at the forefront of cryptocurrency trends. With a wide range of crypto services and a commitment to innovation, our vision is a financial world underpinned by blockchain technology and decentralized finance.

About the Opportunity

What You’ll Be Doing:

Guide the architecture of infrastructure, encompassing technologies such as Kong, RPC, Mesh, SpringCloud microservices framework.

Evaluate the company's business landscape to create design plans and implement solutions based on infrastructure requirements.

Enhance system stability, performance, and efficiency through optimizations.

What We Look For In You:

Possess a Bachelor's degree or higher in computer science or a related field.

Exhibit strong engineering acumen, with a deep understanding of system and database design.

Proficient in Linux, data structures, and algorithms.

Skillful in Java or Golang programming languages.

Strong communication skills, attention to detail, and a strong belief in the future of the crypto industry.

Perks & Benefits

Competitive total compensation package offered.

Comprehensive insurance coverage for employees and their dependents.

More details will be shared throughout the hiring process."

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London, UK
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Job Summary:

Circle is a revolutionary fintech company advancing the forefront of the emerging digital currency landscape. They operate within the internet of money, offering a global, instant, and cost-effective solution for value transmission. By introducing groundbreaking technology like USDC, a blockchain-derived dollar, Circle empowers enterprises, institutions, and developers to leverage unparalleled opportunities for payments, commerce, and market innovations.

Team Environment:

Circle fosters a culture of transparency and reliability, characterized by swift expansion into influential global markets. As an organization, they prioritize speed and effectiveness, with employees upholding the values of Multistakeholder, Mindfulness, Driven by Excellence, and High Integrity. Collaboration and innovation thrive in Circle’s diverse and adaptable remote work ethos, welcoming fresh ideas and engaging all stakeholders.


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Actively monitor and address emerging security threats.

Identify and rectify infrastructure vulnerabilities in collaboration with business units.

Investigate and resolve security incidents in conjunction with other teams.

Devise detection mechanisms to identify irregular activities and cyberattacks.

Support off-hours insider risk inquiries.

Configure and maintain security monitoring tools such as EDR and intrusion detection solutions.

Enhance Security Incident and Event Management, Case Management, and Automation processes.

Provide security advice to internal entities within the company.

Assist in security initiatives like threat modeling, vulnerability assessments, audits, and tool development.

Participate in on-call rotations for after-hours critical alert response.

Key Qualifications:

Proficient in collaborating across teams during high-pressure situations.

Ability to prioritize multiple tasks effectively in dynamic environments.

Self-driven with strong problem-solving skills and independence.

Familiarity with Slack, Apple MacOS, and GSuite platforms.

Desired Experience:

Bachelor's degree in computer science, engineering, or cybersecurity.

4+ years of experience in detection, security response, or engineering roles.

Knowledgeable about cybersecurity regulations and guidelines.

Proficiency in SIEM, Case Management, and SOAR solutions.

Leading security incidents across various levels.

Understanding of MacOS systems.

Experience in SOC or dedicated incident response teams.

Investigative experience with insider-related incidents.

Programming background in Python, Golang, or similar languages.

Exposure to AWS environments, preferably in financial services or fintech sectors.

Familiarity with Slack, Apple MacOS, and GSuite platforms.

Ideal Candidate Attributes:

Views Security Detection & Response as data and engineering challenges.

Displays positive attitude and openness to sharing ideas.

Handles challenges proactively and sees them as growth opportunities.

Self-motivated, initiative-driven, and fearless in communication.

Circle is an equal opportunity employer, embracing diversity and equality without discrimination based on race, religion, gender, sexual orientation, age, or disability. Additionally, where applicable by law, Circle participates in the E-Verify Program to uphold right to work requirements.