Backend (Node.js + Web3 + Java) Developer

Job Description

Company Description MarsDevs is a remote-first, offshore digital product development company, committed to delivering high-quality code and long-lasting technical architectures. We specialize in building MVPs, mobile and web applications, and SaaS products for startups and SMBs. Our services include systematic project analysis, UI/UX design, technical consulting, application deployment, and ongoing support. Based in India, MarsDevs has successfully delivered over 60 solutions across 10 countries and 12 industry verticals in the last four years. ...............................Only Apply If you are available for a contractual role........................................... Backend Developer (Node.js + Web3 + AI) Key Responsibilities Build, maintain, and scale backend services powering our AI Signals platform . Develop Node.js-based APIs and microservices with high performance and security. Integrate Web3 functionality ? wallet creation, crypto transactions, on/off-ramp payment utilities. Collaborate with product and frontend teams to ship reliable and scalable features. Ensure secure deployments and best practices in cloud environments. Quickly adapt to new integrations and ramp up on crypto wallet/payment flows as needed. Requirements 4+ years of backend development , with strong hands-on experience in Node.js (Python or Go is a bonus). Proven experience with crypto wallets (create, deposit, withdraw, transfer, transaction history). Understanding of blockchain utilities, smart contract interaction, and crypto payment services. Strong knowledge of RESTful APIs, microservices architecture, and cloud deployment (AWS/GCP/Azure). Ability to learn fast, troubleshoot deeply, and adapt to Web3-specific requirements. Nice to Have Experience building or integrating HD (Hierarchical Deterministic) wallets. Prior work in Web3, DeFi, or blockchain-based products. Familiarity with AI-driven systems or data-heavy applications. What We Offer Work at the cutting edge of AI + Web3 innovation. End-to-end ownership of backend systems and architecture. A flexible, product-focused, and collaborative work culture. Opportunity to build real-world crypto solutions used at scale.