Senior Full Stack Engineer
NinjaTech AI
Senior Full Stack Engineer
NinjaTech AI
Autonomous AI personal assistant for professionals
Sydney · Full-time · On-site/hybrid
Self-serve consumers and enterprise seats run through the same billing and activation paths. This role owns the money and the funnel.
Build and own monetisation: plans, paywalls, subscriptions, credit and usage metering, auto top-up, access control and revenue share.
Own onboarding and activation end to end — signup, first task, first genuine result — and the experiments that improve them.
Build the analytics and experimentation foundations: events, funnels, attribution and A/B tests, so decisions come from data rather than opinion.
Work directly with payment providers and their failure modes: declines, webhooks, disputes and platform-specific quirks.
3–5+ years full-stack with shipped experience in payments, subscriptions or growth surfaces.
TypeScript/React and Python, plus SQL fluency — you can answer your own funnel question.
Comfort owning a metric, not only a backlog.
Autonomous AI personal assistant for professionals
NinjaTech AI builds an autonomous AI personal assistant named Ninja that acts as an all-in-one helper for busy professionals. Ninja can perform research, writing, file analysis, coding, image generation, and scheduling by negotiating tasks with tools or people, accessed via chat, voice, or video chat with a customizable avatar; it runs on a SaaS platform and uses its own language models and a proprietary decision engine to complete tasks end-to-end. It differentiates itself by handling real-world tasks autonomously rather than just giving guidance, integrating planning, execution, and communication within one system, and drawing on a leadership team with backgrounds at Google, Meta, and AWS. Its goal is to democratize access to executive assistant capabilities, saving time for a wide range of professionals and allowing them to focus on their core responsibilities.
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