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NinjaTech AI in Sydney is hiring a Full Stack Software Engineer to build and deploy AI-powered agentic platforms. This on-site/hybrid role focuses on React, Next.js, Python, and collaboration with VP of Engineering and CTO to ship scalable web applications.
You’ll work across frontend, backend, and infra, optimize performance, write tests, and participate in code reviews in a fast-paced team. The office offers free daily meals and a collaborative culture.
Join NinjaTech AI as a Software Development Engineer: you will learn and use the latest tech to innovate, build and scale long-running AI agents, intelligent Apps and automations (B2B and B2C), powered by SuperNinja — our advanced agentic AI platform with full OS capabilities.
About the Company: NinjaTech AI is a generative AI startup with headquarters in Silicon Valley and a subsidiary in Sydney. NinjaTech AI is backed by Alexa Fund and Samsung Ventures and we are on track to raise Series A funding in 2026. You will contribute to building an agentic AI platform featuring autonomous long-running AI agents, each on dedicated computers with browser, code editor, terminal, and tool integrations. Our AI Agents handle tasks like browsing, coding, workflow automation, data analysis, reporting, building AI-native apps, competitive intelligence, and content production.
About the Role: The Software Engineer is a full‑time position, based at our Sydney office (5 days on‑site; fantastic office space, free daily meals). Our team works in a fast‑paced and collaborative environment. We get a lot done when we ideate together and iterate quickly.
The Software Engineer will design, develop, integrate and deploy various AI technologies within NinjaTech’s Agentic AI product. You will report to the VP of Engineering (ex‑AWS, onsite in Sydney) and will collaborate daily with the Chief Science and Technology Officer/Co‑founder (ex‑AWS, Sydney) and Founder/CEO (ex‑Google, HQ), as well as our strong team of Software Engineers and Applied Scientists, PM, UX, and QA.
What you will do:
Required Experience:
Nice to Have:
NinjaTech AI offers excellent benefits:
Location: Sydney, AU, Hybrid (3 days in office required)
About Us: At Relevance AI, we’re building the home of the AI workforce. Our mission is simple: empower every team to delegate meaningful work to AI agents that think, act, and collaborate like experts. With Relevance AI, anyone can create and manage intelligent agents that handle workflows, decisions, and collaboration — all within one unified platform. Our technology already powers industry leaders such as Canva, Databricks, Confluent, Autodesk, Lightspeed, Rakuten, Aveva, Qualified, and Activision Blizzard, helping them scale excellence across operations, marketing, and sales. We’re backed by Bessemer Venture Partners, Insight Partners, Peak XV, and King River Capital, and raised our Series B in April 2025 to accelerate growth and push the boundaries of agentic automation. Headquartered in San Francisco and Sydney, we operate on a hybrid model and thrive on curiosity, collaboration, and execution — we move fast, think big, and win together. In 2025, we were proud to be named LinkedIn’s #1 Startup in Australia. If you want to define how the world works with AI, join us.
The Role: The greatest engineers today aren't just writing code faster—they're spending more time solving problems and building products that couldn't have existed a year ago. Our team works at the frontier of AI‑native development where curiosity, product thinking, rapid experimentation and judgement are embedded in our ways of working. As a Staff Engineer, you’ll be one of our core product builders and cross‑team technical leader. You’ll set the technical direction behind our most advanced AI capabilities: agents that can act with increasing autonomy on real work. You'll raise the bar for AI engineering and reliability across teams, and take on the hardest, highest‑leverage problems in the company, being deployed onto whatever is most critical at the time. This is the most senior IC seat in the company and a chance to define what AI‑native engineering means here — and beyond.
You'll have access to the latest frontier models, rethink traditional software patterns and work closely with customer‑facing teams to quickly turn ideas into shipped products.
We are willing to sponsor engineers relocating from overseas to Australia.
We believe that AI is fundamentally changing software and what it means to be an engineer. That means our team works differently: AI engineering (coding agents, loops, eval) is a core part of every engineer's workflow. Engineers own product areas and customer problems end‑to‑end, not just implementation. We prototype quickly, validate with customers, and iterate relentlessly. We ship continuously, often multiple times a day. We care about product impact as much as technical quality.
Benefits include:
Location: Sydney, AU, Hybrid (3 days in office required)
We are proud to be an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, national origin, age, sex, marital status, ancestry, neurotype, physical or mental disability, veteran status, gender identity, sexual orientation or any other category protected by law.