Senior Full Stack Engineer - Agent Experience

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.

Sydney

- Full-time
- On-site/hybrid

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

- 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.

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

- Turn ambiguous product bets into working software in days,



then decide from usage data whether to double down or delete it.

- Work directly with our AI and science engineers on how tools, context and streaming behave in the product.

What we're looking for

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

- Robust 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.

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

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

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

Be careful - Don’t provide your bank or credit card details when applying for jobs. Don't transfer any money or complete suspicious online surveys. If you see something suspicious, report this job ad .

#J-18808-Ljbffr

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