Senior Software Engineer - Blockchain Integration
Status
Paris, France
Full time
Hybrid
Compensation is not specified
Role
Software Engineer
Description
We are on a mission to democratize access to digital assets and ensure their security for all. Join us in our endeavor.
Ledger, established in 2014, is a global digital assets and Web3 platform. Our Ledger Nanos secure over 20% of the world's crypto assets. With offices in multiple countries, including Paris, Vierzon, UK, US, Switzerland, and Singapore, we have a dedicated team of 500+ professionals creating products and services that empower individuals and businesses to securely engage with and manage crypto assets. Our Ledger hardware wallets have seen over 6 million units sold across 200 countries.
At Ledger, we live by our unique values, including Pragmatism, Audacity, Commitment, Trust, and Transparency. Our employees contribute significantly to shaping our work culture.
In this position, you will have the chance to expand your skills and knowledge within Ledger's mission of enhancing the security of the digital world, while also improving its accessibility, safety, and user-friendliness.
Join our challenging Blockchain Integration Team at Ledger. This team has been instrumental in achieving the best blockchain integration coverage in the industry through Ledger Live, but we aspire to go even further.
As a Senior Engineer on the Coin Integration Team at Ledger, you will be pivotal in integrating diverse blockchains into the Ledger ecosystem to ensure seamless compatibility and functionality with our devices. This role requires advanced technical proficiency and a thorough understanding of blockchain technologies.
Responsibilities
- Integrate Diverse Blockchains: Contribute to the integration of various blockchain technologies seamlessly into Ledger's ecosystem to guarantee flawless operation with our hardware and software solutions.
- Develop Integration Solutions: Devise and execute strategies for blockchain integration that harmonize with organizational objectives and user requirements.
- Collaborate Cross-Functionally: Work closely with product management, software development, and quality assurance teams to deliver robust blockchain solutions.
- Technical Problem Solving: Tackle intricate blockchain integration challenges using innovative solutions and industry best practices.
- Mentorship and Knowledge Sharing: Offer guidance and share expertise with team members to foster their growth and continuous learning.
- Implement Best Practices: Apply agile best practices tailored to blockchain integration processes to promote adaptability and responsiveness to change.
- Active Participation: Engage in regular agile ceremonies like sprint planning, stand-ups, and retrospectives to heighten team effectiveness and morale.
- Continuous Improvement: Encourage a culture of feedback and innovation by experimenting with new integration techniques to enhance processes.
Requirements
- Extensive Coding Experience: Proficiency in JavaScript, TypeScript, Node.js, and React.
- Blockchain Protocol Knowledge: Strong experience working with various blockchain protocols and standards.
- Agile Methodologies: Understanding of agile project teams and methodologies.
- Analytical Skills: Excellent problem-solving skills with a strategic mindset concerning blockchain integrations and product outcomes.
- Team Collaboration: Exceptional communication and interpersonal skills for effective contribution to a collaborative and innovative team environment.
Bonus Experience
- Blockchain Projects Experience: Demonstrated success in blockchain or cryptocurrency-related projects.
- Hardware Wallet Familiarity: Understanding of hardware wallet technology or security-focused applications.
- Multi-Blockchain Understanding: In-depth knowledge of multiple blockchain architectures, including EVM, Cosmos, and Polkadot.
Benefits
- Equity: Stock options to participate in the company's success.
- Flexibility: Hybrid work policy.
- Social: Annual company outing, frequent social events, snacks, and drinks.
- Medical: Comprehensive health insurance coverage including medical, dental, and vision care.
- Well-being: Personal development, coaching, and fitness programs with dedicated partners.
- Vacation: Five weeks of paid leave annually, in addition to national holidays and rest & relaxation days.
- High tech: Access to high-performance office equipment and gadgets, including Apple products.
- Transport: Partial reimbursement for preferred means of transportation.
- Discounts: Employee discount on company products.
We are an equal opportunity employer committed to diversity and inclusion.
Skills Required
Ledger
Website
www.ledger.comCompany size
Not specified
Location
United States
Description
Not specified
Status
SADR B
Looking for a Growth-Driven Sales Partner (Co-founder mindset) for Oferli Startup📉
Remote, USA
Remote, USA
Part time
Remote
About Us: Oferli is an upcoming tech startup launching in August 2026. We are building a high-impact product with a solid technical foundation, and we are looking for a sharp, results-driven Sales Partner to join our core team.
The Approach & Reality of our Startup:
We are operating lean from the ground up. We believe in proof of work, direct outreach, and real-world traction rather than hiding behind heavy corporate setup before talking to clients. If you understand how early-stage startups scale from zero through hustle, strategy, and direct execution, this role is for you.
What We Are Looking For:
Proven experience in sales, business development, or client acquisition.
A true "startup mindset"—flexible, proactive, and resilient.
Comfortable with an early-stage environment where execution and direct pitching matter most.
Strong English communication skills for international collaboration.
If you are ready to build something remarkable from day one and grow alongside a dedicated team, send us a message with your background and why you are a fit!
The Approach & Reality of our Startup:
We are operating lean from the ground up. We believe in proof of work, direct outreach, and real-world traction rather than hiding behind heavy corporate setup before talking to clients. If you understand how early-stage startups scale from zero through hustle, strategy, and direct execution, this role is for you.
What We Are Looking For:
Proven experience in sales, business development, or client acquisition.
A true "startup mindset"—flexible, proactive, and resilient.
Comfortable with an early-stage environment where execution and direct pitching matter most.
Strong English communication skills for international collaboration.
If you are ready to build something remarkable from day one and grow alongside a dedicated team, send us a message with your background and why you are a fit!
Payment in Crypto
Artem Fedotov
Senior Smart Contract Engineer
Miami, United States
Miami, United States
Full time
Remote
The Role
We are hiring a Senior Blockchain Developer to design and build smart contract systems across multiple client and internal projects.
You will work on a variety of blockchain applications - from DeFi protocols to tokenized systems and Web3 platforms - ensuring high standards in security, scalability, and architecture.
This is a senior-level, hands-on role with exposure to multiple products and industries.
What You’ll Do
Design, develop, and deploy smart contracts using Solidity
Implement token standards (ERC-20, ERC-721, ERC-1155) and custom logic
Build and maintain contract architectures across multiple projects
Ensure security, audit readiness, and upgradeability
Optimize gas usage and performance
Collaborate with backend and frontend teams for integrations
Participate in code reviews and technical decision-making
Contribute to documentation and internal best practices
What We’re Looking For
4+ years of experience in blockchain / smart contract development
Strong expertise in Solidity and EVM-based ecosystems
Experience with Ethereum and L2s (Polygon, Arbitrum, Optimism)
Solid understanding of smart contract security and vulnerabilities
Experience with Hardhat, Foundry, or similar frameworks
Strong software engineering fundamentals (testing, Git, CI/CD)
Ability to work across multiple projects and adapt quickly
Nice to Have
Experience with DeFi protocols, staking, or token economies
Experience working with auditors or security reviews
Familiarity with upgradeable contracts (proxy patterns)
Backend experience (Node.js / TypeScript)
Experience in client-facing or consulting environments
Tech Stack
Solidity · Ethereum · Polygon · Arbitrum
Hardhat / Foundry · Node.js · TypeScript
React · ethers.js · IPFS
Why Join
Work across a diverse portfolio of blockchain projects
Exposure to both client work and internal ventures
Opportunity to influence architecture and technical direction
Collaborative, globally distributed team
Fast-paced environment with continuous learning
What Success Looks Like
Secure, production-ready smart contracts delivered across projects
Successful audits with minimal critical issues
Scalable and reusable contract architectures
Strong collaboration with cross-functional teams
Consistent delivery across multiple initiatives
Hiring Process
Application review
Technical Assessment
Technical interview (Solidity & architecture)
Final discussion
We are hiring a Senior Blockchain Developer to design and build smart contract systems across multiple client and internal projects.
You will work on a variety of blockchain applications - from DeFi protocols to tokenized systems and Web3 platforms - ensuring high standards in security, scalability, and architecture.
This is a senior-level, hands-on role with exposure to multiple products and industries.
What You’ll Do
Design, develop, and deploy smart contracts using Solidity
Implement token standards (ERC-20, ERC-721, ERC-1155) and custom logic
Build and maintain contract architectures across multiple projects
Ensure security, audit readiness, and upgradeability
Optimize gas usage and performance
Collaborate with backend and frontend teams for integrations
Participate in code reviews and technical decision-making
Contribute to documentation and internal best practices
What We’re Looking For
4+ years of experience in blockchain / smart contract development
Strong expertise in Solidity and EVM-based ecosystems
Experience with Ethereum and L2s (Polygon, Arbitrum, Optimism)
Solid understanding of smart contract security and vulnerabilities
Experience with Hardhat, Foundry, or similar frameworks
Strong software engineering fundamentals (testing, Git, CI/CD)
Ability to work across multiple projects and adapt quickly
Nice to Have
Experience with DeFi protocols, staking, or token economies
Experience working with auditors or security reviews
Familiarity with upgradeable contracts (proxy patterns)
Backend experience (Node.js / TypeScript)
Experience in client-facing or consulting environments
Tech Stack
Solidity · Ethereum · Polygon · Arbitrum
Hardhat / Foundry · Node.js · TypeScript
React · ethers.js · IPFS
Why Join
Work across a diverse portfolio of blockchain projects
Exposure to both client work and internal ventures
Opportunity to influence architecture and technical direction
Collaborative, globally distributed team
Fast-paced environment with continuous learning
What Success Looks Like
Secure, production-ready smart contracts delivered across projects
Successful audits with minimal critical issues
Scalable and reusable contract architectures
Strong collaboration with cross-functional teams
Consistent delivery across multiple initiatives
Hiring Process
Application review
Technical Assessment
Technical interview (Solidity & architecture)
Final discussion
Payment in Crypto
SADR B
Web3 Sales & Business Development Partner📉
Remote, USA
Remote, USA
Full time
Remote
Oferli Partnership Announcement
Building the Future of Web3: Join Oferli as a Long-Term Core Partner
Oferli is officially expanding its core leadership. Having successfully established our foundational technical team, we are now opening strategic partnership opportunities for high-level Sales and Business Development Partners specialized in technology and Web3.
We are not looking for short-term contractors; we are searching for dedicated builders ready to scale and elevate this vision to a high international level from the ground up. Our tech team is already set, and now we are expanding to build out the sales and partnership side to bring in major projects.
For security, privacy, and professional efficiency, we have already prepared our dedicated workspace on Notion, along with a secure email-based group discussion space.
What We Are Looking For:
Proven expertise and network within the Technology and Web3 industries.
A long-term entrepreneurial mindset, fully committed to building a powerful ecosystem with us from day one.
Strong capabilities in driving strategic growth, securing high-value projects, and expanding our vision internationally.
If you are a serious professional ready to build this vision with us from the ground up, let’s connect!
Building the Future of Web3: Join Oferli as a Long-Term Core Partner
Oferli is officially expanding its core leadership. Having successfully established our foundational technical team, we are now opening strategic partnership opportunities for high-level Sales and Business Development Partners specialized in technology and Web3.
We are not looking for short-term contractors; we are searching for dedicated builders ready to scale and elevate this vision to a high international level from the ground up. Our tech team is already set, and now we are expanding to build out the sales and partnership side to bring in major projects.
For security, privacy, and professional efficiency, we have already prepared our dedicated workspace on Notion, along with a secure email-based group discussion space.
What We Are Looking For:
Proven expertise and network within the Technology and Web3 industries.
A long-term entrepreneurial mindset, fully committed to building a powerful ecosystem with us from day one.
Strong capabilities in driving strategic growth, securing high-value projects, and expanding our vision internationally.
If you are a serious professional ready to build this vision with us from the ground up, let’s connect!
Payment in Crypto
Yūta Watanabe
Data Analyst
Full time
Remote
ResponsibilitiesCollect, clean, analyze, and visualize both on-chain and off-chain data.Monitor and analyze key blockchain ecosystem metrics, including but not limited to:Active WalletsTransaction VolumeTotal Value Locked (TVL)User RetentionToken Distribution and CirculationLiquidity ChangesIdentify user behavior patterns through data analysis and provide insights to support product growth, operational strategies, and business decisions.Build and maintain dashboards and deliver regular analytical reports.Analyze trends across DeFi, NFT, GameFi, Layer 2, RWA, and other emerging Web3 sectors.Track competitor protocols and industry developments, producing market research and on-chain intelligence reports.Collaborate with Product, Marketing, Operations, and Engineering teams to drive data-driven decision making.Develop data models, KPI frameworks, and optimize analytics processes.RequirementsBasic QualificationsBachelor's degree or higher in Statistics, Mathematics, Computer Science, Financial Engineering, Economics, or a related field.2+ years of experience in data analytics.Experience in Web3, blockchain, cryptocurrency, or fintech industries is highly preferred.Strong interest in blockchain technology and familiarity with major blockchain ecosystems.Technical SkillsData AnalyticsStrong proficiency in SQL, including complex queries and advanced analytical techniques.Proficiency in Python and common data analysis libraries:PandasNumPyMatplotlibPlotlyFamiliarity with ETL processes and data warehouse architecture.Experience with:A/B TestingFunnel AnalysisUser Lifecycle AnalysisRetention AnalysisWeb3 Data AnalyticsStrong understanding of blockchain fundamentals:WalletsTransactionsSmart ContractsGas FeesEvent LogsToken Standards (ERC-20, ERC-721, ERC-1155)Additional requirements:Familiarity with EVM-based ecosystems:EthereumBNB ChainArbitrumBaseKnowledge of Solana and other non-EVM ecosystems is a plus.Ability to analyze on-chain fund flows, user behavior, and protocol-level data.Analytics ToolsHands-on experience with one or more of the following:Dune AnalyticsFlipside CryptoNansenGlassnodeToken TerminalArkhamBigQueryThe Graph (GraphQL)Data VisualizationExperience with:TableauPower BILooker StudioMetabaseAbility to transform complex datasets into actionable business insights and clear visualizations.Preferred QualificationsExperience analyzing DeFi, DEX, Lending, Staking, or Restaking protocols.Strong understanding of Tokenomics and token economy design.Experience with On-Chain Forensics and fund tracking.Familiarity with:MEV (Maximal Extractable Value)Liquidity mechanismsCross-chain bridgesExperience with machine learning, predictive analytics, or statistical modeling.Proven experience building and maintaining Dune Dashboards.Published blockchain research reports or on-chain analysis.Strong written and reading skills in English, with the ability to work directly with technical documentation.What We're Looking ForStrong analytical mindset and attention to detail.Excellent logical reasoning and problem-solving skills.Passion for crypto markets and blockchain technology.Strong communication and presentation abilities.Self-motivated, proactive, and capable of working independently.Ability to learn quickly and adapt in the fast-paced Web3 environment.Keywords for Candidate SearchWeb3 Data Analyst, Blockchain Data Analyst, Crypto Data Analyst, On-Chain Analyst, SQL, Python, Dune Analytics, Flipside, Nansen, Glassnode, BigQuery, EVM, Ethereum, DeFi, Tokenomics, On-Chain Analytics, Blockchain Analytics, Data Visualization, Tableau, Power BI, Web3 Research, Crypto Research.
Payment in Crypto
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