Full Stack Software Engineer - Agentic Ai

Ninjatech Ai; Sydney; On-site; AUD 90,000 - 140,000; Full time

Benefits offered by this job

Health subsidy

Superannuation

Paid time off

Meals and snacks

Stock options

Job summary

NinjaTech AI, a Sydney-based AI startup, is hiring a Software Development Engineer to design, develop, and deploy AI-powered features within the Agentic AI platform. You’ll work with senior leaders on innovative projects, collaborating across teams to deliver scalable, reliable web applications.

The role is full-time, based at our Sydney office, with a strong emphasis on hands-on coding, code reviews, and rapid iteration in a startup environment. Excellent benefits and meals provided.

Qualifications

• 1+ year of software development experience building scalable web apps.
• Bachelor’s degree in Computer Science or a related field is preferred.

Responsibilities

• Build features end-to-end for the web app (super.myninja.ai).
• Enhance performance and optimize for fast user experiences.
• Create and maintain API documentation and platform docs.
• Write clean, well-documented code in React, Next.js, and Python; ensure quality with tests and CI/CD.
• Participate in code reviews and provide constructive feedback.
• Troubleshoot and fix platform issues and prevent recurrence.
• Collaborate with Product to define requirements and priorities.
• Integrate with backend via RESTful APIs and WebSockets.
• Unit-test code for robustness and edge cases.
• Continuously evaluate new technologies to boost development efficiency.

Skills

Full-stack

Cloud AWS

Problem solving

Ownership

Team player

Education

Bachelor’s degree in CS or related field

Tools

React

Next.js

Python

Node.js

Job description

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:

As a key member of our engineering team, the Software Developer will be responsible for translating our vision and customer needs into functional and appealing interactive applications, ensuring a great user experience.

• Build features (end-to-end) for our web app (super.myninja.ai)

• Bring expertise in performance and optimization to improve our applications for smooth and fast user experience.

• Develop and maintain documentation for the platform, including API documentation.

• Write clean, efficient, and well-documented code in React, Next.js, Python and ensure code quality through automated testing and continuous integration and deployment.

• Participate in code reviews and provide constructive feedback to other members of the team.

• Troubleshoot and debug issues that arise in the platform, and implement solutions to prevent recurrence.

• Collaborate with product management to define and prioritize product requirements, ensuring technical feasibility and alignment with company goals and user requests.

• Leverage RESTful APIs and web sockets for fast communication with our backend systems.

• Unit-test code for robustness, including edge cases, usability, and general reliability.

• Continuously discover, evaluate, and implement new technologies to maximize development efficiency.

Required Experience:

• 1+ year(s) of experience in software development, with a focus on building scalable and reliable web applications.

• Generalist mindset: you’re comfortable working across frontend, backend, and infra. You see every layer as an exciting opportunity to make an impact.

• Professional experience in at least one of: Python, React, Node.js, or Next.js and curiosity to learn the rest

• Familiarity with cloud platforms (AWS strongly preferred) and databases (Supabase, PostgreSQL, DynamoDB, Firebase, etc.)

• Systematic thinker: you design before you code and you care about how things are built, not just that they work

• Ownership mentality: you take problems from start to finish without needing to be told what’s next

• Strong problem-solving skills and ability to work in a team environment.

• Bachelor’s degree in Computer Science or relevant field preferred.

Nice to Have:

• Startup experience: you’ve shipped in fast-moving, ambiguous environments

• End-to-end projects you’ve built yourself (side projects, open source, hackathons)

• Experience with TypeScript, WebSockets, CI/CD pipelines, or service-oriented architectures

• Interest in AI/ML and how large language models work

Benefits:

NinjaTech AI offers excellent benefits:

• Annual Health insurance subsidy

• Superannuation

• Paid Time Off (Vacation, Sick & Holidays)

• Paid meals and snacks

• Stock Option Plan