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Apple

Sr. Machine Learning Engineer, Speech LLM Evaluation

Cambridge, MA$184,700 – $324,800Posted 29 days ago

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Join the team redefining what a deeply personal and integrated assistant can be.

As part of the Siri organization, you will help shape one of the world's most widely used AI assistants, powered by our next-generation of Apple Intelligence, with capabilities like personal context understanding and on-screen awareness, built with privacy from the ground up. Your work will have direct, meaningful impact for users across iOS, iPadOS, macOS, watchOS, and visionOS.

Our Speech Evaluation team sits at the center of Apple's ASR, TTS, and real-time conversational AI efforts, partnering directly with the modeling teams. We're growing the team to take on a role focused specifically on evaluating audio LLMs: designing the datasets that stress-test them and the metrics that decide whether they're ready. You'll help define how Apple measures a new class of models that listen, speak, and reason.

This is a rare opportunity to build at the intersection of cutting-edge AI and human-centered design, shipping technology that is centered around users and their needs.

Description

This role owns the data and metrics foundation for evaluating speech LLMs (e.g., real-time speech understanding and generation models) across accuracy, robustness, and conversational quality. You'll build and curate evaluation datasets that reflect real usage - from personalized named-entity queries to multi-turn fluid conversations - and design the metrics and automated judges that turn model outputs into actionable, trustworthy signal. You'll work closely with modeling, infrastructure, and product partners to make sure every new model is evaluated quickly, consistently, and at the right level of rigor before it reaches customers.

","responsibilities":"Designs and curates audio evaluation datasets that represent real-world usage, including personalized, multilingual, and conversational scenarios.

Defines and implements evaluation metrics for audio LLMs, spanning accuracy, robustness, and conversational/generation quality.

Builds automated evaluation pipelines and LLM-as-judge tooling to scale audio model assessment without sacrificing reliability.

Analyzes model evaluation results to identify accuracy gaps, regressions, and opportunities for hillclimbing, and communicates findings to modeling teams.

Partners with human-evaluation programs to design rating protocols and validate that automated metrics correlate with human judgment.

Collaborates with infrastructure teams to integrate new evaluation sets and metrics into shared tooling.

Contributes evaluation methodology for new audio LLM capabilities as they emerge, adapting existing frameworks to novel model behaviors.

Preferred Qualifications

Experience evaluating audio-native or multimodal (speech-in, speech-out) large language models.

Experience designing or running human evaluation studies (e.g., side-by-side comparisons, MOS ratings) at scale.

Familiarity with personalization and named-entity evaluation challenges in speech systems.

Experience with multilingual or international audio dataset development.

Experience with distributed data processing frameworks (e.g., Spark) for large-scale audio dataset generation.

Publication record or demonstrated contributions in speech, audio ML, or NLP evaluation.

Minimum Qualifications

Bachelor's degree in Computer Science, Electrical Engineering, or a related field, or equivalent practical experience.

Experience building or working with text, speech or audio evaluation pipelines and metrics.

Proficiency in Python and experience building data processing pipelines at scale.

Experience curating or annotating datasets for machine learning evaluation or training.

Working knowledge of statistics as applied to measuring model performance and interpreting evaluation results.

Familiarity with large language model evaluation techniques, including automated (LLM-as-judge) and human evaluation methods.

Strong written and verbal communication skills, with the ability to explain evaluation results to both technical and non-technical audiences.

Pay & Benefits

At Apple, base pay is one part of our total compensation package and is determined within a range. This provides the opportunity to progress as you grow and develop within a role. The base pay range for this role is between $184,700 and $324,800, and your base pay will depend on your skills, qualifications, experience, and location.

Apple employees also have the opportunity to become an Apple shareholder through participation in Apple's discretionary employee stock programs. Apple employees are eligible for discretionary restricted stock unit awards, and can purchase Apple stock at a discount if voluntarily participating in Apple's Employee Stock Purchase Plan. You'll also receive benefits including: Comprehensive medical and dental coverage, retirement benefits, a range of discounted products and free services, and for formal education related to advancing your career at Apple, reimbursement for certain educational expenses - including tuition. Additionally, this role might be eligible for discretionary bonuses or commission payments as well as relocation. Learn more about Apple Benefits

Note: Apple benefit, compensation and employee stock programs are subject to eligibility requirements and other terms of the applicable plan or program.

About Apple

Working at Apple means doing more than you ever thought possible and having more impact than you ever imagined.

Size: 10,000+ employees
Industry: Technology: Manufacturing

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