Full Stack Software Engineer - Agentic AI Startup

Ninjatech.ai

Sydney, NSW, Australia permanent

Posted: January 29, 2026

Required Skills

Job Description

Join NinjaTech AI as a Software Development Engineer: you will learn and use the latest tech to innovate, build and scale intelligent Apps and automations (B2B and B2C), powered by SuperNinja - our advanced agentic AI platform with full OS capabilities. For this role we will prioritize candidates who have strong experience in Frontend development (in React, Next.js).

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.

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 Founder/CEO (ex-Google, HQ) and Chief Science and Technology Officer/Co-founder (ex-AWS, Sydney), 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:

• 3+ years of experience in software development, with a focus on building scalable and reliable web applications.

• Expert-level experience in React.

• Proficiency in Next.js and Python.

• Experience with AWS Cloud.

• Strong expertise in various API protocols, including RESTful API and WebSockets.

• Familiarity with database technologies such as Firebase, Supabase, DynamoDB, NoSQL, PostgreSQL, or MySQL.

• Hands-on experience in building services for service-oriented architecture (SoA) on top of AWS services, leveraging various components (e.g., SQS, Lambda, SNS, ECS, etc.).

• In-depth understanding of the entire web development process (design, development and deployment).

• Familiarity with RESTful APIs and integration of backend services.

• Knowledge of version control systems (e.g., Git) and experience working with collaborative development tools.

• Ability to perform well in a fast-paced environment where deadlines are tight and priorities can change rapidly.

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

• Experience working in an Agile development environment.

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

Benefits:

NinjaTech AI offers excellent benefits:

• Annual Health insurance subsidy

• Superannuation

• Paid Time Off (Vacation, Sick & Holidays)

• Paid meals and snacks

• Stock Option Plan

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