WFH Full-Stack Developer (LLM/AI)

Job Overview Our client is an advertising technology platform that helps advertisers see and manage their media buying across channels in one place with real-time dashboards, cross-channel reporting, and an AI assistant that works alongside marketing teams. Building that assistant is a core part of their roadmap, and this role sits at the centre of it: you will build product features on top of large language models just as much as you build traditional web features. You will join a small, senior team and own your work end-to-end, from the user interface through the backend services to production. Schedule Monday - Friday, 9:00 AM - 6:00 PM Sydney Time, with 1 hour unpaid break (40 work hours per week) Responsibilities: Build product features on top of LLMs: give the AI assistant access to tools and data it can act on, shape its prompts and behaviours, and make its answers reliable for real advertisers Measure and improve AI quality systematically — build and run evaluations, analyse real conversations, and turn failures into test cases Build user-facing features across dashboard and reporting products: interactive charts and tables, drag-and-drop layout editing, and multi-user real-time collaboration Design and ship well-structured backend APIs in TypeScript Integrate with third-party advertising platform APIs and keep their data flowing reliably through scheduled sync jobs Work across relational and document databases as the feature demands Write automated tests that genuinely gate merges, review PRs, and take turns investigating production issues Requirements: 3–5 years of professional full-stack experience with TypeScript in production Hands-on experience building applications on top of large language models — integrating LLM APIs, designing tools or agents, prompt engineering, and evaluating output quality (not just calling a completion endpoint once) Solid front-end depth in a modern SPA framework (Angular preferred; strong React/Vue engineers who can ramp quickly are welcome) Solid back-end depth in Node.js, with an eye for clean API design Hands-on experience with both SQL and NoSQL databases, and the judgement to know which fits Working cloud knowledge on AWS (containers, serverless, storage) or a comparable cloud Comfortable in a CI/CD culture with genuine unit-testing habits, not test-after-if-time Clear written English for docs, PRs, and async communication Qualifications: Ad-tech or marketing-analytics domain experience (campaigns, placements, metrics like CPM and ROAS) Experience designing evaluation or benchmark harnesses for LLM features Browser automation experience (e.g. Playwright) Independent Contractor Perks Permanent work from home Immediate hiring Health Insurance Coverage for eligible locations Note Please click the "Apply" button to complete your application, including the assessment questions, technical check, and voice recording. Your hourly pay rate will be established based on your performance in the application process; submissions with all requirements fulfilled will receive priority review. One application, multiple possibilities: When you apply, our team reviews your background against all current openings, not just this one! If a different role fits your skills, we'll get in touch! We also encourage you to keep exploring our job board and apply directly to any position that excites you.