Vitali Carajileasco

Product-oriented Full-Stack Software Engineer with broad experience building and operating production software across mobile, web, backend, databases, and infrastructure. Experienced in Android (Java), iOS (Swift), React Native, Vue.js, Node.js, PostgreSQL, and MySQL, with additional expertise in system architecture, SaaS platforms, APIs, payment integrations, real-time communication, database replication, and server infrastructure.

I combine hands-on engineering with architectural and product thinking, taking complex requirements from concept to reliable, maintainable solutions. Comfortable working across the entire technology stack, learning new technologies quickly, and solving problems where software, infrastructure, and business requirements intersect.

• Designed and developed complete software products spanning mobile applications, web platforms, backend services, databases, and infrastructure, taking projects from initial concept through production deployment and ongoing development.
• Architected and developed a multi-tenant SaaS/CRM platform for fitness clubs, covering membership management, subscriptions, attendance tracking, scheduling, payments, sales, staff management, notifications, and multi-club operations.
• Developed native mobile applications for Android and iOS, as well as cross-platform solutions with React Native, integrating them with backend APIs and business-critical services.
• Designed and implemented backend systems using Node.js, Fastify, PostgreSQL, and Sequelize, including REST APIs, authentication, role-based access control, real-time communication, automated processes, and third-party integrations.
• Built and maintained production infrastructure, including Linux servers, Nginx, PM2, PostgreSQL replication, Patroni, etcd, SSL/TLS, monitoring, backups, security hardening, and deployment workflows.
• Integrated payment providers, banking APIs, hardware devices, access-control systems, QR/NFC technologies, and other third-party services into business platforms.
• Designed scalable architectures supporting dedicated databases and APIs, multi-club environments, mobile applications, and white-label deployments for different customers and business requirements.
• Successfully worked across the full software development lifecycle, combining hands-on development with technical architecture, infrastructure management, troubleshooting, product decisions, and continuous optimization.