Job Description

Sydney · Full-time · In office/hybrid

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SuperNinja is an AI workforce that plans, writes code, runs research and ships real work for customers. You would own the surface where people meet that agent — the thread, the workspace, the moment a task becomes a deliverable. It is the highest-visibility slice of the product and it changes weekly.

What you'll do n

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Own end-to-end slices of the agent experience — UI, API and the backend services behind them, not just the frontend of someone else's endpoint.

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Ship agent-facing features into production continuously and stay on them: reliability, latency, incidents, observability.

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Turn ambiguous product bets into working software in days, then decide from usage data whether to double down or delete it.

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Work directly with our AI and science engineers on how tools,



context and streaming behave in the product.

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What we're looking for n

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5+ years building and operating full-stack products in production.

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Strong TypeScript/React (we run Next.js) and genuine backend depth in Python (FastAPI) — you can design a schema and debug a slow query, not only call an API.

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Product instinct: you argue about the shape of the feature, not only the ticket.

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Comfort with high change rates and incomplete specs. Agentic products do not hold still.

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Stack: Next.js/React/TypeScript, Python/FastAPI, Postgres/Supabase, AWS (CDK, CloudFront, ECS, Lambda, Cognito), containerised agent sandboxes.

📌 Senior Full Stack Engineer - Agent Experience (Sydney)
🏢 NinjaTech AI
📍 Sydney