Justworks

HR Tech

SeniorSoftwareEngineer,AI

$140–181k Remote - International Remote Friendly
Market Sentiment
HIGH DEMAND

Neural analysis suggests this role is
optimal for Senior candidates.

The Brief

“Senior Software Engineer, AI at Justworks. Skills: AI agents, Backend architecture, LLM, System integration. Design core components of agent platform. Build capabilities layer for agents”

What You'll Achieve.

Build, deploy, and maintain large-scale, complex applications; Ship high-quality, production-ready systems; Scale complexity through knowledge and reasoning

Industry & Context.

HR Tech
Problems you'll solve

Remove roadblocks; Make pragmatic technical decisions in ambiguous and emerging territory; Identify automation opportunities; Proactively identifying solutions

What They're Looking For.

Must Have

5+ years of backend engineering experience building and operating production systems, Hands-on experience with LLMs and AI agents (orchestration, RAG, tool/function calling, or similar), API design and system integration skills, Product-minded: questions requirements and contributes to product decisions, not just execution, Proven ownership of complex projects in ambiguous, early-stage environments

What You'll Do.

Design core components of agent platform

Build capabilities layer for agents

Architect knowledge and memory infrastructure

Design trust and safety framework

Contribute to agent evaluation and testing

Partner with Operations to understand workflows

Translate process knowledge into agent capabilities

Mentor other engineers

How You'll Work.

Team & Collaboration

Work with others to remove roadblocks; Join a small, highly autonomous cross-functional team; Partner directly with Operations

Full Job Description

Who We Are At Justworks, you’ll enjoy a welcoming and casual environment, great benefits, wellness program offerings, company retreats, and the ability to interact with and learn from leaders in the startup community. We work hard and care about our most prized asset - our people. We’re helping businesses get off the ground by enabling them to focus on running their business. We solve HR issues. We’re data-driven and never stop iterating. If you’d like to work in a supportive, entrepreneurial environment, are interested in building something meaningful and having fun while doing it, we’d love to hear from you. We're united by shared goals and shared motivations at Justworks. These are best summed up in our company values, which are reflected in our product and in our team. Our Values If this sounds like you, you’ll fit right in. Who You Are You are self-driven and like to work with others to remove roadblocks. You are curious and love to explore and learn new technologies. You have demonstrated the ability to build, deploy, and maintain large-scale, complex applications. You care more about solutions and impacting the customer experience than using a particular tool or framework. About the role: You will join a small, highly autonomous cross-functional team to build AI agents that fundamentally transform how operations work at scale. Instead of writing bespoke software for every workflow, we are developing an agent platform that can read operational knowledge, reason about it in context, and execute tasks end-to-end. This approach allows us to scale complexity through knowledge and reasoning, rather than simply through code. This is an opportunity to join a foundational team, which currently consists of fewer than five engineers. The work spans critical areas including LLM-powered agent design, robust backend service architecture, tool and integration development, and sophisticated knowledge infrastructure. We are seeking a Senior Software Engineer with a strong pas

Free ATS check

Applying for this Senior Software Engineer, AI role?

Most applicants get filtered before a human reads their resume. See if yours makes the cut.

How to Apply on Greenhouse

  • Create a Greenhouse profile before applying — it saves time across multiple applications.
  • Upload your resume as a PDF; the parser handles it better than Word.
  • Answer all knockout questions carefully — wrong answers auto-reject before a human sees you.
  • Enable email notifications to track application status in real time.

ANONYMOUS · UNFILTERED

What do employees actually say about Justworks?

Real rants from real employees. Read before you apply.

Read Company Rants →