Senior Backend Engineer - AI Team - Paradox

Workday; United States; Hybrid; USD 170,000 - 230,000; Full time

Job summary

Workday is seeking a Senior Backend Engineer to architect and build production systems powering large-scale LLM capabilities. You will lead the design of robust infrastructure and API services, bridging AI research and production-grade software with a focus on latency, reliability, and observability.

Ideal candidates have 6+ years in backend development, strong Python expertise, and hands-on experience with LLM-based products in production.

Qualifications

• 6+ years of backend software development experience in distributed systems.
• Proven expertise in Python and modern backend technologies/api design.
• Experience developing LLM-based products (Agents, RAG) in production environments.
• Strong system architecture design skills, with cloud (AWS/GCP) and CI/CD experience.
• Deep knowledge of relational and non-relational databases.
• Solid testing practices across the pyramid and Clean Code principles.
• Experience leading technical designs and mentoring engineers.
• Fluent English communication (written and spoken).
• Authorization to work in Israel.

Responsibilities

• Architect and build production systems that bring LLMs to life at scale.
• Lead design and development of robust infrastructure and high-scale services.
• Ensure AI capabilities are integrated into scalable, resilient backend architectures.
• Design and implement high-performance backend services and APIs.
• Promote best practices through code reviews and architectural decisions.
• Develop LLM evaluation frameworks for production integration.
• Understand product challenges to guide software-building decisions.

Skills

Backend development

Python

LLM-based products

System architecture

Databases

Testing pyramid

Clean Code

Technical leadership

English fluency

Israel work authorization

Job description

Your work days are brighter here.

We’re obsessed with making hard work pay off, for our people, our customers, and the world around us. As a Fortune 500 company and a leading AI platform for managing people, money, and agents, we’re shaping the future of work so teams can reach their potential and focus on what matters most. The minute you join, you’ll feel it. Not just in the products we build, but in how we show up for each other. Our culture is rooted in integrity, empathy, and shared enthusiasm. We’re in this together, tackling big challenges with bold ideas and genuine care. We look for curious minds and courageous collaborators who bring sun-drenched optimism and drive. Whether you’re building smarter solutions, supporting customers, or creating a space where everyone belongs, you’ll do meaningful work with Workmates who’ve got your back. In return, we’ll give you the trust to take risks, the tools to grow, the skills to develop and the support of a company invested in you for the long haul. So, if you want to inspire a brighter work day for everyone, including yourself, you’ve found a match in Workday, and we hope to be a match for you too.

About the Team

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.

About the Role

As a Senior Backend Engineer, you will be responsible for architecting and building the production systems that bring LLMs to life at scale. You will lead the design and development of robust infrastructure and high-scale services, ensuring our AI capabilities are integrated into scalable, resilient, and performant backend architectures.

In this role, you will:

• 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.

About You

Basic Qualifications:

• 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.

Other Qualifications:

• 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.

Our Approach to Flexible Work

With Hybrid Work, we’re combining the best of both worlds: in-person time and remote. Our approach enables our teams to deepen connections, maintain a strong community, and do their best work. We know that flexibility can take shape in many ways, so we require employees to work three days a week in the office and two days at home. This means you’ll have the freedom to create a flexible schedule that caters to your business, team, and personal needs, while being intentional to make the most of time spent together.

At Workday, we are committed to providing an accessible and inclusive hiring experience where all candidates can fully demonstrate their skills. If you require assistance or an accommodation at any point, please email [e-mail].