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Annotation Jobs in California (NOW HIRING)

Rivian

Sr. Software Analyst, Data, Autonomy

Palo Alto, CA · On-site

$101K - $127K/yr

You will partner closely with Annotation Operations, Perception, and Engineering teams to ensure data readiness for model training and evaluation. The ideal candidate is data‑driven ...

YO AI Labs

Radiologist Remote

Palo Alto, CA · Remote

$15 - $80/hr

Radiologist - Hand Anatomy Annotation Role Type: Contractor Location: Remote Role Summary We are seeking Radiologists with strong anatomical knowledge and visual reasoning skills to support an AI ...

YO AI Labs

Radiologist Remote

San Jose, CA · Remote

$15 - $80/hr

Radiologist - Hand Anatomy Annotation Role Type: Contractor Location: Remote Role Summary We are seeking Radiologists with strong anatomical knowledge and visual reasoning skills to support an AI ...

YO AI Labs

Radiologist Remote

Los Angeles, CA · Remote

$15 - $80/hr

Radiologist - Hand Anatomy Annotation Role Type: Contractor Location: Remote Role Summary We are seeking Radiologists with strong anatomical knowledge and visual reasoning skills to support an AI ...

YO AI Labs

Radiologist Remote

San Francisco, CA · Remote

$15 - $80/hr

Radiologist - Hand Anatomy Annotation Role Type: Contractor Location: Remote Role Summary We are seeking Radiologists with strong anatomical knowledge and visual reasoning skills to support an AI ...

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Showing results 21-40

All JobsAnnotation JobsAnnotation Jobs in California

Annotation information

What is an annotation?

An annotation job involves labeling or tagging data, such as text, images, audio, or video, to help train artificial intelligence and machine learning models. Annotators manually or semi-automatically add metadata, such as identifying objects in images, transcribing speech, or categorizing text. This process improves AI accuracy by providing high-quality training data. Annotation work is crucial for industries like autonomous driving, healthcare, and natural language processing.

What are the typical projects or tasks an annotation specialist works on?

Annotation specialists typically work on projects involving the labeling and categorizing of data—such as images, videos, audio, or text—to train machine learning models. Weekly tasks may include reviewing raw data, applying specific tagging guidelines, performing quality checks on completed annotations, and collaborating with team members or machine learning engineers to ensure accuracy and consistency. Frequent feedback sessions and ongoing updates to annotation instructions are common as project requirements evolve. This role often requires close teamwork and clear communication within a collaborative environment, especially for large-scale or rapidly changing projects.

What are the key skills and qualifications needed to thrive in the annotation position?

Excelling in an Annotation role generally requires keen attention to detail, strong analytical abilities, and a high level of accuracy, often backed by a relevant educational background. Familiarity with annotation tools, data labeling software, and sometimes basic programming or data management platforms is valuable. Effective time management, consistency, and clear communication are soft skills that differentiate top performers. These competencies are crucial to ensuring data quality and supporting the development of machine learning and AI systems.

What are annotation jobs?

Annotation jobs involve labeling or tagging data, such as images, text, or audio, to help train machine learning models. These roles often require attention to detail and familiarity with annotation tools or software, and they are commonly performed remotely or in a digital environment.

What skills are needed for annotation?

Annotation jobs require strong attention to detail, good reading comprehension, and the ability to follow specific guidelines. Familiarity with data labeling tools and basic computer skills are also important. Accuracy and consistency are essential for producing high-quality annotated data.

What are the most commonly searched types of Annotation jobs in California?

The most popular types of Annotation jobs in California are:

What are popular job titles related to Annotation jobs in California?

For Annotation jobs in California, the most frequently searched job titles are:

What job categories do people searching Annotation jobs in California look for?

The top searched job categories for Annotation jobs in California are:

What cities in California are hiring for Annotation jobs?

Cities in California with the most Annotation job openings:

Annotation jobs near you
Infographic showing various Annotation job openings in California as of September 2026, with employment types broken down into 1% As Needed, 46% Full Time, 49% Part Time, and 4% Contract. Highlights an 49% Physical, 1% Hybrid, and 50% Remote job distribution.

Multilingual Data Annotation Specialist

Marina Del Rey, CA • On-site

Zefr, Inc
Software Development • 51 - 200 employees
Learn more about Zefr, Incexternal

Full-time

Medical, Dental, Vision, Life, Retirement, PTO

Posted 12 days ago

Key responsibilities

  • Annotate videos, images, and metadata across platforms such as YouTube, TikTok, Meta, and Snap.

  • Conduct daily annotation and quality evaluation to ensure high-quality human annotation for AI systems.

  • Interpret, apply, and help refine labeling frameworks and documentation, and identify emerging trends or issues.

Job description

What we do:
Zefr is the leading global technology company enabling responsible marketing in walled garden social environments. Zefr's solutions empower brands to manage their content adjacency on scaled platforms such as YouTube, Meta, TikTok, and Snap, in accordance with industry standard frameworks. Through its patented AI technology, Zefr offers brands and agencies more accurate and transparent solutions for social walled gardens. The company is headquartered in Los Angeles, California, with additional locations across the globe.
What you'll do:
We are hiring a Multilingual Data Annotation Specialist to support the training and performance of Zefr's advanced AI systems. In this role, you will annotate videos, images, and metadata across platforms such as YouTube, TikTok, Meta, and Snap.
High quality human annotation is foundational to how our machine learning systems interpret, classify, and evaluate content at scale. Your work will directly shape the accuracy and integrity of our AI solutions.
We are looking for someone curious about machine learning and computer vision, energized by nuanced decision making, and committed to delivering precise, thoughtful work. The ideal candidate is self-directed, analytical, proactive, and comfortable navigating ambiguity. Candidates should value clarity, ask smart questions, and continuously seek opportunities to improve processes.
Here's what you'll get to do:
  • Use internal tools to label social media content according to Zefr's contextual category guidelines.
  • Conduct daily annotation and quality evaluation across video, image, and metadata formats.
  • Apply cognitive and cultural nuance when making judgment calls on complex or sensitive content.
  • Interpret, apply, and help refine labeling frameworks and documentation.
  • Identify emerging trends or edge cases and surface potential issues to stakeholders.
  • Conduct root cause analyses to identify opportunities for improving content quality.
  • Provide insights on content patterns and contribute to enhancements of the labeling interface.
  • Generate weekly reports with findings and quality recommendations.
  • Perform quality assurance across multiple project pipelines.
  • Maintain up-to-date knowledge of Zefr policies and proactively suggest optimization opportunities.
  • Gain foundational exposure to machine learning concepts and develop an understanding of how high quality annotation data powers AI systems.

Here's what we're looking for:
Language Requirements:
  • Fluency in English and Hindi is required.
  • Fluency in Spanish, Mandarin, Turkish, Tagalog, or others are a plus.

Qualifications and Experience:
  • Professional experience in annotation, content moderation, labeling, quality assurance, or policy enforcement.
  • Strong cultural fluency and ability to interpret contextual nuance across varied content types.
  • Familiarity with major social media platforms including TikTok, YouTube, Facebook, Instagram, and Snapchat.
  • Exceptional attention to detail with the ability to perform repetitive tasks with consistency and accuracy.
  • Strong written communication skills, particularly in explaining ambiguity, inconsistencies, or definitional drift.
  • Ability to apply style guides and enforce consistency across diverse content formats.
  • Experience using AI tools such as Claude, Gemini, ChatGPT, or similar technologies.
  • Proficiency in Google Workspace applications.
  • Familiarity with SQL is a plus.

Working Style and Mindset:
  • Reliable, self motivated, and capable of delivering high quality work independently.
  • Strong analytical thinking and structured problem solving skills.
  • Comfortable working in a fast-paced environment with shifting priorities.
  • Work with sensitive content, including political topics, religious perspectives, violence, and adult material.
  • Effective collaborator who can also operate autonomously.
  • Willing to work a hybrid schedule with 2 to 3 days per week in our Marina del Rey office.
  • Ability to appropriately handle confidential and proprietary information with sound judgment.

Benefits (for US based employees):
  • Flexible PTO
  • Medical, dental, and vision insurance with FSA options
  • Company-paid life insurance
  • Paid parental leave
  • 401(k) with company match
  • Professional development opportunities
  • 13 paid holidays off
  • Flexible hybrid work schedules
  • "Summer Fridays" (shorter work days on select Fridays during the summertime)
  • In-office lunches and lots of free food
  • Optional in-person and virtual events (we like to celebrate!)

Compensation (for US based employees):
The anticipated salary for this position is 70,500. Individual pay is determined by factors such as job-related skills, experience, and relevant education or training. If your compensation expectations fall outside of this range, it may still be worth having a conversation.
Zefr is an equal opportunity employer that embraces diversity and inclusion in the workplace. We are committed to building a team that represents a variety of backgrounds, skills, and perspectives because we know this only makes us better. We strongly encourage women, persons of color, LGBTQIA+ individuals, persons with disabilities, members of ethnic minorities, foreign-born residents, and veterans to apply even if you do not meet 100% of the qualifications.

Apply