Senior Backend Engineer - AI Team - Paradox

At Paradox, we believe when you get the people thing right, you can build teams that change the world. As part of Workday, we are laser-focused on building world-class products—backed by a decade of leadership in Conversational AI. Our Tel-Aviv R&D center is where deep experience meets next-generation technology. We aren't just experimenting with Large Language Models, we are deploying them at an unmatched global scale. We combine our historical data advantage with advanced LLM capabilities to directly influence the hiring experiences of millions of candidates worldwide. As a Senior Backend Engineer, you will be responsible for architecting and building the production systems that bring LLMs to life at scale.

Responsibilities

Design and implement high-performance backend services and APIs that power Paradox’s core AI products; Bridge the gap between AI research and production-grade software, focusing on latency, reliability, and observability; Promote engineering standards through rigorous code reviews, architectural design, and best practices in distributed systems; Design and implement LLM evaluation frameworks to assess and integrate new AI models into real-world production flows; Deeply understand product challenges to make intelligent and efficient software-building decisions

Requirements

6+ years of hands-on experience in backend software development, focusing on building complex, distributed systems; Proven Expertise in Python and modern backend technologies/API design; Direct experience in developing LLM-based products (Agents, RAG, etc.) within production environments; Strong System Architecture design skills, with experience in cloud-based environments (AWS/GCP) and CI/CD flows; Database Mastery: deep knowledge of both relational and non-relational databases; Engineering Quality: strong understanding of automated testing at all levels of the testing pyramid and Clean Code principles; Technical Leadership: proven ability to lead technical designs, collaborate across teams, and mentor junior engineers; Fluent in English, including both written and verbal communication; Authorization to work in Israel

Nice to have

Experience with specialized AI infrastructure (Vector Databases, LLM Observability tools); Experience with Conversational AI or complex Dialogue Management systems; Familiarity with MLOps practices and monitoring LLM performance in production; Background in Data Science or Data Engineering

Benefits

Flexible hybrid work: three days a week in the office and two days at home