Senior Software Development Engineer , Stores Foundational AI Rufus

We are building foundational LLMs for Amazon Stores that fuse world knowledge with deep e-commerce understanding to power next-generation shopping experiences. These systems continuously learn from real-world customer interactions to become more helpful personalized and context-aware over time.

We are looking for builders who are passionate about large-scale systems AI innovation and customer impact. You will work at the intersection of distributed systems machine learning infrastructure and science to bring frontier researchespecially in post-training and reinforcement learninginto production at Amazon scale.

Key job responsibilities
* Architect and build scalable ML infrastructure powering LLM training and post-training workflows including supervised fine-tuning reinforcement learning and continuous learning from live traffic
* Transform real-world customer interactions into high-quality training signals enabling continuous model improvement and better customer experiences
* Build and optimize post-training and RL systems including reward modeling policy optimization data collection loops.
* Drive experimentation and iteration velocity by building tooling and frameworks that enable rapid hypothesis testing signal validation and model quality improvements
* Partner closely with applied scientists to translate frontier techniques (e.g. RLHF agentic workflows multi-turn optimization) into reliable production-grade systems
* Own systems end-to-end including design implementation deployment observability and operational excellence
* Raise the engineering bar through technical leadership design reviews and mentorship influencing best practices across the organization

- 5 years of non-internship professional software development experience
- 5 years of programming with at least one software programming language experience
- 5 years of leading design or architecture (design patterns reliability and scaling) of new and existing systems experience
- Experience as a mentor tech lead or leading an engineering team
- Experience with vLLM SGLang TensorRT or similar platforms in production environments
- Experience with CUDA kernels or ML/low-level kernels

- 5 years of full software development life cycle including coding standards code reviews source control management build processes testing and operations experience
- Bachelors degree in computer science or equivalent
- Experience with Machine Learning and Large Language Model fundamentals including architecture training/inference lifecycles and optimization of model execution

Amazon is an equal opportunity employer and does not discriminate on the basis of protected veteran status disability or other legally protected status.

Los Angeles County applicants: Job duties for this position include: work safely and cooperatively with other employees supervisors and staff; adhere to standards of excellence despite stressful conditions; communicate effectively and respectfully with employees supervisors and staff to ensure exceptional customer service; and follow all federal state and local laws and Company policies. Criminal history may have a direct adverse and negative relationship with some of the material job duties of this position. These include the duties and responsibilities listed above as well as the abilities to adhere to company policies exercise sound judgment effectively manage stress and work safely and respectfully with others exhibit trustworthiness and professionalism and safeguard business operations and the Companys reputation. Pursuant to the Los Angeles County Fair Chance Ordinance we will consider for employment qualified applicants with arrest and conviction records.

Our inclusive culture empowers Amazonians to deliver the best results for our customers. If you have a disability and need a workplace accommodation or adjustment during the application and hiring process including support for the interview or onboarding process please visit for more information. If the country/region youre applying in isnt listed please contact your Recruiting Partner.

The base salary range for this position is listed below. Your Amazon package will include sign-on payments and restricted stock units (RSUs). Final compensation will be determined based on factors including experience qualifications and location. Amazon also offers comprehensive benefits including health insurance (medical dental vision prescription Basic Life & AD&D insurance and option for Supplemental life plans EAP Mental Health Support Medical Advice Line Flexible Spending Accounts Adoption and Surrogacy Reimbursement coverage) 401(k) matching paid time off and parental leave. Learn more about our benefits at CA Palo Alto - 193300.00 - 261500.00 USD annually
USA WA Seattle - 168100.00 - 227400.00 USD annually