Senior Applied Scientist

NinjaTech AISydneyRemoteFull-time3 Sept 2026

NinjaTech AI is seeking a Senior Applied Scientist to advance autonomous AI agents through applied research in reinforcement learning, LLM training, and multimodal AI. The role involves hands-on work in production-scale ML systems, collaborating with leadership and engineering teams, and owning model development from research to deployment.

What you'll do

Research, prototype, train, evaluate, and deploy advanced ML and LLM systems, with a focus on reinforcement learning and agentic AI.
Develop and apply state-of-the-art RL techniques, including RLHF, to improve model reasoning, reliability, accuracy, and task performance.
Design large-scale training and evaluation datasets, including synthetic data generation, statistical modeling, and data-mining techniques.
Train, fine-tune, distill, quantize, and optimize large language models for production environments.
Build high-performance multi-GPU training and inference pipelines using modern acceleration and mixed-precision techniques.
Develop rigorous evaluation frameworks and experimentation systems to measure model quality, behavior, and performance.
Design and run experiments, including A/B tests, to validate model and product improvements.
Build robust, scalable production ML systems and write high-quality code primarily in Python and Rust.
Optimize algorithms and systems for latency, throughput, memory efficiency, and cost.
Advance NinjaTech’s natural-language and speech capabilities, including NLU/NLG, ASR, TTS, and STT.
Translate novel academic research into practical capabilities that can be shipped to users.
Continuously evaluate emerging research, models, and techniques and determine where they can meaningfully improve Ninja’s AI systems.

What you need

Must-have

Machine LearningDeep LearningReinforcement LearningRLHFPPOTransformerPythonRust

Soft skills

AnalyticalProblem SolvingCollaborationCommunication

AIMachine LearningReinforcement LearningLLMAutonomous AgentsResearchPythonRustPyTorchRemote

/What you'll do

/What you need

Must-have

Soft skills

What you'll do

What you need