Senior Backend Software Engineer – Builders

Relevance AI

full-time

Posted on: 1/8/2026

Location Type: Hybrid

Location: Sydney • Australia

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About the role

Design, build, and operate scalable back-end systems that power AI agent and workflow builders.
Own mission-critical services and infrastructure, delivering impactful features from ideation through to production.
Push the boundaries of applied AI by enabling new agent capabilities, workflow orchestration, and system behaviours.
Shape how we build by influencing engineering standards, architecture, and processes as we scale.
Mentor and support engineers across the team, raising the bar for technical quality and ownership.
Set and uphold high standards for code quality, performance, reliability, and security.
Collaborate closely with product, design, and leadership to align technical direction with business outcomes.

4+ years of hands-on software engineering experience, ideally within fast-paced, high-growth tech environments.
Strong experience designing, building, and maintaining production back-end systems.
Thrive in dynamic, high-performance startup settings and comfortable with ambiguity, rapid iteration, and taking initiative.
Demonstrated ability to take full ownership of projects, solve complex problems, and consistently deliver high-quality, impactful results.
Deep interest in artificial intelligence and excitement to build innovative, category-defining products.
Regularly leverage AI tools and technologies in your workflow, and stay up-to-date with the latest advancements to boost productivity and innovation.

Benefits

📈 ESOP – Employee Stock Ownership Plan so you can grow with the company
🤖 AI Productivity Benefit – Get up to $1200 USD/year to spend on AI tools, courses, and learning resources that help you work smarter and grow your skills
👶 Parental Leave – We offer 12 weeks of paid parental leave for all eligible new parents, and an additional 6 weeks for the birthing parent
🎉 Milestone Merch – Celebrate your work anniversaries with customised Relevance AI swag
🍿 Food, Drinks & Community – Stay energised with free breakfasts, healthy snacks, and a fully stocked fridge of drinks. Enjoy team lunches provided every Thursday and Friday, plus Uber Eats dinners and regular catered office meals throughout the week. As the home of the AI workforce, we also host vibrant community events featuring thought leaders, industry partners, and the wider tech community.
🪩 Quarterly Team Events – Build stronger connections through fun, meaningful team bonding experiences every quarter
🏓 Social Clubs – Share your hobbies and interests by joining or starting a club with your teammates. From hiking and chess to board game nights and social committee activities—there’s something for everyone!
🧠 Sonder EAP – Access 24/7 mental health and wellbeing support through Sonder, our Employee Assistance Program

Tip: use these terms in your resume and cover letter to boost ATS matches.

back-end systemssoftware engineeringproduction systemscode qualityperformancereliabilitysecurityAI toolsworkflow orchestrationarchitecture

mentoringcollaborationproblem-solvinginitiativeownershipadaptabilitycommunicationinfluencetechnical qualitydynamic work environment