Full Stack Engineer

Cross River • Fort Lee, NJ

8h • Onsite

About The Position

Cross River builds the infrastructure behind the world’s most innovative financial products. Their technology and capital solutions power payments, cards, lending, and digital asset capabilities that move money safely, instantly, and inclusively — trusted by leading fintechs, enterprises, and disruptors across the globe. Their mission is to build the financial infrastructure that expands access and opportunity for all. Guided by a culture of collaboration, curiosity, and purpose, Cross River has been named one of American Banker’s Best Places to Work in Fintech year after year. In this role, you will join a team where innovation and integrity drive everything, helping to shape the future of finance.

Requirements

• 4+ years of professional software development experience, with a proven track record of leading complex full-stack projects.
• Solid knowledge of React, modern JavaScript (ES6+), and state management patterns at scale.
• Python or Node.js, Express.js, and designing scalable Microservices architectures.
• Advanced experience with SQL and NoSQL databases, including performance tuning and schema design for high-load environments.
• Hands-on experience architecting on AWS (DynamoDB, S3, RDS, Lambda, and API Gateway).
• Deep understanding of TDD, CI/CD pipelines, and Agile/Scrum leadership.
• Ability to debug problems across distributed systems and optimize bottlenecks in real-time data flows.
• Great communicator with the ability to influence technical direction and manage stakeholder expectations.
• Professional experience or deep technical projects involving Large Language Models, Prompt Engineering, or RAG (Retrieval-Augmented Generation) workflows.

Nice To Haves

• Knowledge of Infrastructure as Code (Terraform/CDK) is a plus.

Responsibilities

• Lead the design, architecture, and enhancement of our LLM-based platform. You will be responsible for high-level technical decisions regarding the python or Node.js and React ecosystem.
• Work closely with product managers and stakeholders to translate business vision into scalable technical requirements. Lead cross-functional alignment between engineering teams.
• Architect applications for extreme speed and reliability. Own the strategies for scaling to handle high traffic and complex real-time data processing.
• Design and oversee robust authentication and authorization frameworks (Identity Server, OAuth2, OpenID Connect). Ensure the platform meets enterprise-grade security standards for data protection.
• Set the standard for clean, maintainable, and testable code. Lead rigorous code reviews and establish "best practice" guidelines for the entire engineering team.
• Actively mentor junior and mid-level developers. Drive a culture of technical growth, peer learning, and collaborative problem-solving.
• Stay at the bleeding edge of AI/LLM trends. Beyond application, you will evaluate and integrate emerging tools to enhance product intelligence.
• Lead the troubleshooting of complex, systemic issues across the stack. Implement proactive monitoring to ensure high availability.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: No Education Listed
• Number of Employees: 501-1,000 employees