Full Stack Developer Needed

We need an experienced Full-Stack architect to review/design a system architecture that involves both Java Spring Boot and Node.js services working together. This is a short scoping/architecture task we need clear guidance on how these two services should communicate, split responsibilities, and stay maintainable long-term. We have a system where: One part of the backend is built in Spring Boot (Java) - [core business logic / banking-grade processing] Another part is built in Node.js - [handles real-time features / lightweight APIs / third-party integrations] What you'll do: Review our current setup (or requirements) and recommend the best architecture pattern for the two services to coexist Advise on communication strategy - REST, gRPC, message queue (Kafka/RabbitMQ), or event-driven approach Recommend where responsibilities should live (e.g., what stays in Spring Boot vs. what belongs in Node.js) Flag any scalability, security, or data-consistency concerns with a dual-stack setup Provide a short written summary or diagram of the recommended architecture Requirements: Strong hands-on experience with both Java/Spring Boot and Node.js in production systems Solid understanding of microservices architecture and inter-service communication patterns Experience with system design for polyglot (multi-language) backends Able to explain trade-offs clearly, not just theory any Cloud exposure (AWS/Azure/GCP) Nice to have: Experience using AI-assisted development tools like GitHub Copilot, Claude Code, Cursor AI, or similar Please share: An example of a project where you've architected or worked across both Java and Node.js services Your general approach to deciding what belongs in which service in a polyglot system Availability to complete this within the scope