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Java jobs in United States

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  • Senior Blockchain Developer
    Senior Blockchain Developer
    3 days ago
    $240000–$280000 yearly
    Full-time
    Manhattan, New York

    Senior Blockchain Developer Remote | Full-Time | $240,000–$280,000 USD Build the Future of Web3 Are you passionate about blockchain technology and excited by the opportunity to build products that can transform industries? We're looking for a Senior Blockchain Developer to join our growing team and help create next-generation solutions across Web3, digital assets, tokenized real estate, decentralized finance (DeFi), and smart contract infrastructure. This is more than just another engineering role. You'll have the opportunity to shape technical strategy, influence product direction, and work on innovative projects that push the boundaries of blockchain technology. If you're a builder, problem solver, and blockchain enthusiast who thrives in a fast-paced environment, we'd love to hear from you. Responsibilities • Design, develop, test, and deploy secure smart contracts on Ethereum and EVM-compatible blockchains., • Build and maintain scalable decentralized applications (dApps) and Web3 platforms., • Develop backend services, APIs, and blockchain integrations using Node.js and TypeScript., • Collaborate with product managers, designers, and engineers to deliver high-quality features and products., • Architect blockchain solutions that prioritize scalability, security, and performance., • Conduct code reviews and provide technical mentorship to junior and mid-level developers., • Integrate wallets, token standards, payment systems, and third-party blockchain services., • Monitor, troubleshoot, and optimize production blockchain applications., • Implement security best practices and participate in smart contract audits and risk assessments., • Improve development workflows, CI/CD pipelines, testing frameworks, and deployment processes., • Research emerging blockchain technologies and evaluate new tools, protocols, and frameworks., • Contribute to technical documentation, architecture planning, and engineering standards., • Participate in technical discussions and help drive long-term product and technology strategy., • Work closely with cross-functional teams to ensure successful product launches and ongoing improvements. Required Qualifications • 5+ years of professional software engineering experience., • 3+ years of hands-on blockchain development experience., • Strong expertise in Solidity and Ethereum smart contract development., • Experience building production-grade applications using React, TypeScript, and Node.js., • Strong understanding of blockchain architecture, decentralized systems, and Web3 technologies., • Experience with ethers.js, viem, wagmi, or similar Web3 libraries., • Knowledge of token standards including ERC-20, ERC-721, and ERC-1155., • Experience with REST APIs, GraphQL, databases, and cloud infrastructure., • Strong understanding of software design patterns and scalable architecture., • Excellent problem-solving, communication, and collaboration skills. Nice-to-Have Qualifications • Experience building DeFi, NFT, RWA, or tokenization platforms., • Familiarity with Layer 2 scaling solutions and cross-chain technologies., • Experience conducting or supporting smart contract security audits., • Knowledge of AWS, Docker, Kubernetes, and infrastructure automation., • Experience working in startups or high-growth technology companies., • Open-source contributions within the blockchain ecosystem.

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  • Custodian/Maintenance Worker
    Custodian/Maintenance Worker
    1 month ago
    Full-time
    Greenpoint, Brooklyn

    Join our dynamic team as a Custodian/Maintenance Worker and play a vital role in maintaining a clean, safe, and welcoming environment. This energetic position offers the opportunity to contribute to the overall upkeep of our facilities through hands-on cleaning, custodial tasks, and basic maintenance duties. If you thrive in a fast-paced setting and take pride in creating a positive space for others, this role is perfect for you! We are committed to providing paid positions that support your growth and well-being. Duties Perform thorough cleaning of all areas, including floors, restrooms, offices, and common spaces using commercial cleaning equipment and floor care. Conduct janitorial tasks like trash removal, dusting, window washing, and restocking supplies to ensure a spotless environment. Carry out custodial responsibilities . Assist with facilities maintenance activities such as minor repairs, painting (residential or commercial), and troubleshooting basic equipment issues. Support industrial cleaning projects when required, ensuring safety protocols are followed during extensive cleaning operations. Maintain cleanliness of outdoor areas, including parking lots and walkways, by sweeping and debris removal. Follow safety guidelines and proper procedures during all cleaning and maintenance activities to promote a secure workplace. Snow removal and more . Experience Prior janitorial or custodial experience in commercial or residential settings is highly preferred. Familiarity with floor care. Experience with general facilities maintenance tasks including minor repairs and painting is advantageous. Knowledge of industrial cleaning procedures and equipment operation is a plus. Strong attention to detail with the ability to work independently or as part of a team. Ability to follow safety protocols diligently while handling cleaning chemicals and maintenance tools. Excellent organizational skills to manage multiple tasks efficiently in a busy environment. Embark on a rewarding career where your skills help create clean, safe spaces that everyone can enjoy! Pay: From $20.00 per hour

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  • FRONT DESK CONCIERGE (PLEASE NO CALLING THE BUSINESS NUMBER)
    FRONT DESK CONCIERGE (PLEASE NO CALLING THE BUSINESS NUMBER)
    2 months ago
    Full-time
    Greenpoint, Brooklyn

    Du Method is a boutique luxury skincare spa in Greenpoint, Brooklyn focused on elevated treatments, exceptional client care, and a highly curated experience. As we expand into our new flagship space, we are looking for a Spa Coordinator who is polished, reliable, organized, and excited to grow with a fast-growing luxury brand. This is not just a front desk position — we are looking for someone who genuinely loves hospitality, beauty/wellness, and creating a warm, elevated environment for every client who walks through our doors. What We’re Looking For Strong multitasking and organizational skills Bubbly, warm, and professional personality Positive energy and excellent communication skills Highly presentable with a polished appearance Reliable and punctual — reliability is extremely important to us Someone proactive who pays attention to details and takes initiative Strong culture fit with a team-oriented mindset Comfortable with technology, scheduling systems, and client communication Social media and email marketing experience is a must Responsibilities Greeting and checking clients in and out Answering phone calls, texts, and emails professionally Keeping the front desk and spa environment clean, tidy, and elevated at all times Assisting with appointment scheduling and optimizing the daily schedule Helping with social media content and engagement Assisting with email marketing and client communication Supporting overall spa operations and maintaining a seamless client experience Position Details Part-time with opportunity for growth into a larger role Competitive compensation Higher pay available for the right individual with strong experience and professionalism Opportunity to grow with a luxury spa brand during an exciting expansion phase If you are polished, dependable, proactive, and love making people feel taken care of, we would love to hear from you. Pay: $21.00 - $25.00 per hour Benefits: Employee discount Work Location: In person

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