OverviewAs a Senior Back-end Engineer, you’ll lead the development of secure, high-throughput payment solutions that bridge blockchain and fiat ecosystems for our cutting-edge Skin Gambling and Casino Platform. Your expertise will directly enable seamless cross-chain operations and drive the future of digital financial services in a collaborative, globally distributed environment.Required Qualifications5+ years of professional back-end development experience with Node.js and TypeScript in production environments. Proven expertise in integrating crypto payment gateways and fiat processors.Hands-on experience with integration of RPC Node Providers (e.g., Infura, Alchemy) for cross-chain operations (ERC-20/BEP-20/TRC-20 tokens).Proficiency in PostgreSQL, including schema design, optimization, and ORM tools (Drizzle or equivalent).Strong knowledge of distributed systems using Redis, message brokers (NATS/Kafka), and real-time protocols (WebSockets).Experience deploying microservices via Kubernetes, Docker, and CI/CD pipelines (GitLab/GitHub Actions).Familiarity with monorepo management tools (e.g., Turborepo, Nx).Fluency in Ukrainian or Russian and proficiency in English for technical collaboration in a remote/global team setting.Ability to work within the CET/EET time zone.Your AdvantagePrior integration experience with ZEN.com’s payment ecosystem.Experience with Skin/NFT Gambling or Online Casinos.Exposure to front-end technologies like React, Next.js, and state management (MobX/Redux).Previous experience working in a start-up environment with rapid iteration cycles.Key ResponsibilitiesDesign, develop, and maintain scalable back-end services for crypto and fiat payment processing using Node.js, TypeScript, and PostgreSQL.Integrate and optimize payment gateways for cryptocurrencies (ERC-20/BEP-20/TRC-20) and traditional fiat systems, ensuring secure and low-latency transactions.Implement cross-chain payment solutions by interfacing with RPC Node Providers for deposits, withdrawals, and balance synchronization.Architect event-driven systems leveraging NATS, Redis, and WebSockets for real-time transaction monitoring and notifications.Optimize database performance and integrity using Drizzle ORM, including complex querying and indexing strategies.Collaborate with front-end teams to define APIs and ensure seamless integration with React/Next.js applications (full-stack exposure).Establish CI/CD pipelines via GitLab and Turborepo, deploying containerized services (Docker) on Kubernetes clusters.Conduct code reviews, troubleshoot production issues, and implement observability tools for system health monitoring.Drive security best practices for payment handling, including encryption, audit trails, and compliance checks. #J-18808-Ljbffr