Senior Full-Stack Engineer, AI-Powered Fintech Platform

Crossriverbank; Fort Lee (NJ); On-site; USD 160,000 - 200,000; Full time

Job summary

Cross River Bank is seeking a Senior Full Stack Engineer who thrives at the intersection of intelligent systems and polished product experiences. You’ll work across the entire stack from designing React interfaces that surface AI capabilities to engineers and end users, to building the Python and Node.js services that power our LLM-based Agentic platform.

A key part of this role is hands‑on experience with designing, building, and integrating MCP servers that connect our AI agents to internal

Qualifications

• Hands-on LLM, prompt engineering, RAG workflows and agent frameworks.
• Experience building and consuming MCP servers.
• 5+ years in professional software development on full‑stack systems.
• JavaScript (ES6+), React, and modern state management at scale.
• AWS (DynamoDB, S3, RDS, Lambda, API Gateway); Terraform is a plus.
• Strong TDD, CI/CD and Agile/Scrum leadership.
• Debug distributed systems and optimize real-time data flows.
• Excellent communication to influence direction and manage stakeholders.

Responsibilities

• Design, build, and improve our LLM-based Agentic platform end-to-end.
• Architect high‑performance services in Python and/or Node.js with real-time data handling.
• Maintain MCP servers for secure access to internal tools and APIs.
• Create React interfaces exposing AI capabilities and dashboards.
• Collaborate with product, compliance, and engineering to translate vision into requirements.
• Ensure platform security and regulatory compliance across the stack.
• Mentor engineers on full-stack best practices and AI system production.
• Evaluate new models and tooling; prototype impactful enhancements.

Skills

LLM capabilities

prompt engineering

RAG workflows

agent frameworks

LLM evaluation strategies

MCP servers

full-stack experience

JavaScript/React

Job description

Cross River Bank is seeking a Senior Full Stack Engineer who thrives at the intersection of intelligent systems and polished product experiences. You’ll work across the entire stack from designing React interfaces that surface AI capabilities to engineers and end users, to building the Python and Node.js services that power our LLM-based Agentic platform.

A key part of this role is hands‑on experience with designing, building, and integrating MCP servers that connect our AI agents to internal