Senior AI Engineer: Agentic LLM Systems

PwC; Sydney; On-site; AUD 150,000 - 190,000; Full time

Job summary

PwC Australia is seeking an AI Engineer to design, build and evaluate production agent systems that reason, call tools, retrieve knowledge and manage long-horizon tasks for clients across advisory services. The role emphasizes rigorous evaluation, scalable TypeScript code, and collaboration with diverse experts in a cloud environment.

The successful candidate will own end-to-end work from prototyping to production deployment, focusing on reliability, observability and cost-aware design in Azure.

Qualifications

• Strong TypeScript development experience, ideally in a Node.js backend context.
• Hands-on experience building agents with a modern agent framework or SDK.
• Experience building or operating an agent harness or runtime loop in production.

Responsibilities

• Build and extend our agent harness in TypeScript: the runtime loop, tool dispatch, streaming, retries and tool-call repair, state persistence and recovery.
• Design context and memory strategies for long-horizon work: context compaction and summarisation, memory management, prompt caching.
• Architect multi-agent and sub-agent systems: lead/worker patterns, task decomposition, parallel sub-agent execution, hand-off contracts.
• Design and expand agent tool ecosystems with typed schemas and a sandboxed command tool.
• Route across models/providers through LiteLLM gateway, tuning model selection and routing policy.
• Engineer retrieval and RAG pipelines grounded in trusted sources: embeddings, vector search, and surface to agents.
• Produce structured model outputs using typed schemas and robust prompts and instructions.
• Build evaluation harnesses and offline batch evals to measure accuracy, faithfulness and cost.
• Instrument agents with observability and tracing (Langfuse, OpenTelemetry).
• Produce clean, maintainable code deployed at scale in Azure cloud; review PRs and participate in lifecycle events.
• Contribute to team stand-ups and firm-wide AI and engineering forums.

Skills

TypeScript

Node.js

Agent systems

LLM tooling

PostgreSQL

Observability

Tools

Vercel AI SDK

LiteLLM gateway

Azure cloud

pgvector

Job description

PwC Australia is seeking an AI Engineer to design, build and evaluate production agent systems that reason, call tools, retrieve knowledge and manage long-horizon tasks for clients across advisory services. The role emphasizes rigorous evaluation, scalable TypeScript code, and collaboration with diverse experts in a cloud environment.

The successful candidate will own end-to-end work from prototyping to production deployment, focusing on reliability, observability and cost-aware design in Azure.