Senior Backend Engineer (AI)

TL;DR

Senior Backend Engineer (AI): Designing and operating scalable back-end systems for an AI agent and workforce builder platform with an accent on API design, distributed systems, and workflow orchestration. Focus on building production-ready AI capabilities, enhancing system reliability, and mentoring engineering teams.

Location: Hybrid (Sydney, Australia) — 3 days in office required

Company

Building the home of the AI workforce, empowering teams to delegate meaningful work to intelligent AI agents that collaborate like experts.

What you will do

• Design, build, and operate scalable back-end systems powering AI agent and workflow builders.
• Own mission-critical services and infrastructure from ideation through to production.
• Push applied AI boundaries by enabling new agent capabilities and workflow orchestration.
• Influence engineering standards, architecture, and scaling processes.
• Mentor and support engineers to raise the bar for technical quality and ownership.
• Collaborate with product, design, and leadership to align technical direction with business outcomes.

Requirements

• 4+ years of software engineering experience, ideally in fast-paced, high-growth tech environments.
• Strong experience designing, building, and maintaining production back-end systems.
• Expertise in designing and operating APIs (REST or GraphQL) and distributed systems.
• Ability to take full ownership of projects and solve complex problems in a startup setting.
• Deep interest in AI and active use of AI tools in the professional workflow.
• Must be based in Sydney, Australia to comply with hybrid office requirements.

Nice to have

• Experience building ecosystems and native integrations.
• Contributions to open-source projects.
• Hands-on experience with LLMs, agent workflows, or AI infrastructure.

Culture & Benefits

• Employee Stock Ownership Plan (ESOP).
• AI Productivity Benefit: up to $1200 USD/year for AI tools, courses, and learning.
• 12 weeks of paid parental leave for all eligible parents, plus an additional 6 weeks for the birthing parent.
• Comprehensive office perks: free breakfasts, healthy snacks, and catered meals.
• Quarterly team bonding events and various social clubs.
• 24/7 mental health and wellbeing support through Sonder EAP.