Senior Full-Stack Engineer: AI-Native Architect & Prototyper

Polyworld Australia Pty. Ltd.; Sydney; On-site; AUD 140,000 - 190,000; Full time

Benefits offered by this job

Superannuation

Bondi Junction office

Job summary

Polyworld Australia Pty Ltd is seeking a senior engineer to own the full stack, from backend services and APIs to the web app and the React Native mobile app, plus the cloud infrastructure.

In a small team you will make architectural decisions, coordinate with software contractors, and base work on rigorous research and evaluation.

You will drive production reliability, monitoring, and performance work while shaping how the product is built and deployed at scale.

Qualifications

• At least five years of commercial software engineering experience.
• Strong backend depth including services, APIs, migrations.
• Web and mobile development experience with React Native/Expo preferred.
• AI-native working: design evaluations for non-deterministic outputs.
• Proficiency with CI/CD pipelines and infrastructure-as-code.
• Clear written English; decisions documented before building.

Responsibilities

• Build and operate backend services and APIs and data models beneath them.
• Develop the web app and the React Native/Expo mobile app, including releases to environments.
• Own deployment and infrastructure: CI/CD, infrastructure-as-code, and environments.
• Make the architecture decisions on service boundaries and client-backend interactions.
• Prototype retrieval and grounding approaches and build the evaluations that establish their effectiveness.
• Design and integrate a low-latency voice layer for mindcast in production.
• Keep production healthy through monitoring and performance work.

Skills

Backend engineering

APIs

Data modeling

Web development

React Native

Expo

CI/CD

IaC

Architecture

Research

Production monitoring

Education

Bachelor's degree in Computer Science or Software Engineering

Job description

Polyworld Australia Pty Ltd is seeking a senior engineer to own the full stack, from backend services and APIs to the web app and the React Native mobile app, plus the cloud infrastructure.

In a small team you will make architectural decisions, coordinate with software contractors, and base work on rigorous research and evaluation.

You will drive production reliability, monitoring, and performance work while shaping how the product is built and deployed at scale.