Senior Back-End Engineer, Node.js

Cross River

Senior Back-End Engineer developing financial technology solutions utilizing AI-driven platforms at Cross River. Collaborating across stacks and engineering teams for innovative product experiences.

Posted 6/21/2026full-timeJerusalem • 🇮🇱 IsraelSeniorWebsite

Tech Stack

Tools & technologies

AWSDistributed SystemsDynamoDBJavaScriptNode.jsPythonReactReduxTerraform

About the role

Key responsibilities & impact

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

Requirements

What you’ll need

Available working some US hours
Proficient in Hebrew and English both written and verbal, sufficient for achieving consensus and success in a remote and largely asynchronous work environment
Must Hands-on production experience with Large Language Models, prompt engineering, RAG workflows, agent frameworks, and LLM evaluation strategies
Experience building and consuming MCP servers
5+ years of professional software development with a proven record on complex full-stack systems
Experience with modern JavaScript (ES6+), React, state management (Redux, Zustand, or similar) at scale
Hands-on experience architecting on AWS (DynamoDB, S3, RDS, Lambda, and API Gateway)
Knowledge of Infrastructure as Code (Terraform) is a plus
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.

Benefits

Comp & perks

Flexible hybrid model: 3 days a week in the office – A must
₪1,000 net monthly wellness benefit – from therapy to Pilates to your kid’s art class
Full Keren Hishtalmut, private health & dental insurance
Donation matching, volunteering days, team outings, and mentorship programs
A mission-driven culture that values ownership, trust, and meaningful impact

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

PythonNode.jsReactLarge Language Modelsprompt engineeringRAG workflowsLLM evaluation strategiesstate managementAWSInfrastructure as Code

Soft Skills

communicationinfluencestakeholder managementteam collaborationmentorshipproblem-solvingleadershiptechnical directionconsensus buildingremote work