Senior Principal AI Systems Engineer

Job Description

Advantest is seeking a highly experienced Senior Principal AI Systems Engineer to architect and deliver  
advanced production AI capabilities. This role is for a hands-on technical leader with deep expertise in  
agentic AI, open-source model development, model fine-tuning, evaluation systems, and reliable AI  
infrastructure.
The ideal candidate combines advanced AI knowledge with strong software-engineering discipline and  
has experience building systems that reason across multiple steps, use tools, evaluate results, recover from  
failures, and improve from feedback.

**Key Responsibilities**  
*++Agentic AI Systems++*  
· Architect production-grade systems for tool-using and multi-step AI agents.
· Design orchestration, planning, memory, session management, retries, timeouts, observability, and failure  
recovery.
· Establish structured and typed interfaces between models, tools, data services, and applications.
· Build controls that prevent agents from bypassing required validation and approval stages.
· Develop reusable agent frameworks that support multiple products and deployment environments.
*++Model Development and Fine-Tuning++*  
· Fine-tune open-source language models and specialized models for complex technical applications.
· Apply LoRA, QLoRA, full fine-tuning, distillation, preference optimization, and related post-training  
methods.
· Develop efficient strategies for adapting foundation models to new applications and datasets.
· Evaluate tradeoffs among model quality, inference performance, deployment cost, security, and  
maintainability.
· Build optimized models and inference profiles for constrained deployment environments.
*++Evaluation and Quality++*  
· Define measurable standards for model accuracy, reliability, safety, and production readiness.
· Build offline evaluation datasets, automated regression suites, judge systems, and promotion gates.
· Develop methods for measuring confidence, consistency, tool-use accuracy, and action quality.
· Establish processes for model comparison, controlled release, rollback, and continuous improvement.
· Ensure model outputs remain grounded in available evidence and approved data sources.
*++Training Data and Learning Pipelines++*  
· Design reproducible pipelines for training-data generation, cleaning, labeling, versioning, and validation.
· Develop synthetic-data and preference-data strategies where appropriate.
· Implement controls for data leakage, contamination, duplication, provenance, and customer isolation.
· Convert expert feedback and observed outcomes into high-quality training and evaluation datasets.
· Maintain traceability between datasets, experiments, model versions, and production results.
*++AI Platform and MLOps++*  
· Build repeatable training, evaluation, and deployment workflows for multi-GPU infrastructure.
· Establish model lifecycle practices, including model cards, release criteria, monitoring, and rollback.
· Support secure, private, air-gapped, and customer-controlled deployment environments.
· Develop observability for model behavior, tool execution, latency, cost, and failure conditions.
· Partner with platform and CI/CD teams to make AI workflows repeatable, testable, and auditable.
*++Technical Leadership++*  
· Set technical direction for a small, highly skilled AI engineering team.
· Review architectures, models, training methods, and production implementation decisions.
· Mentor engineers and establish durable AI engineering practices.
· Work with domain experts to translate complex technical requirements into reliable AI capabilities.
· Communicate technical risks, tradeoffs, progress, and recommendations to engineering and executive  
stakeholders.