Full Stack Engineer

Cross River builds financial infrastructure and technology solutions that power payments, cards, lending, and digital asset capabilities. The company is seeking a Senior Full Stack Engineer to design and build an LLM-based Agentic platform, including Python and Node.js services, MCP servers, and React interfaces. The role also involves collaborating across product, compliance, and engineering teams to deliver secure, scalable, regulatory-compliant financial technology.

• Design, build, and continuously improve our LLM-based Agentic platform. Own end-to-end architecture decisions from model orchestration and prompt design to retrieval pipelines, tool-calling patterns, and evaluation frameworks
• Architect and build high-performance services in Python and/or Node.js. Design systems for extreme speed, reliability, and real-time data processing under high traffic conditions
• Design and maintain MCP servers that give AI agents structured, secure access to internal banking systems, external APIs, databases, and developer tools making Agentic platform composable and extensible by design
• Build intuitive React interfaces that expose AI capabilities like chat interfaces, agentic dashboards, real-time streaming UIs, and internal tooling. Own state management patterns and component architecture at scale
• Partner with product managers, business stakeholders, compliance, and engineering teams to translate vision into scalable technical requirements and roadmaps
• Design and ensure the platform meets enterprise-grade security and financial regulatory standards
• Actively upskill fellow engineers on full-stack best practices, LLM integration patterns, and production of AI systems. Help define coding standards and contribute to a culture of engineering excellence
• Evaluate emerging models, frameworks, and tooling. Prototype and integrate the most impactful advances into our platform and internal developer productivity tooling