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Video Annotation Jobs in California (NOW HIRING)

Data Operations Engineer

Mountain View, CA · On-site

$136K - $163K/yr

Preferred : • Experience with multimodal datasets (text, image, video, audio, or 3D). • Familiarity with data annotation, labeling workflows, or dataset preparation for machine learning. • ...

Experience with video understanding (temporal consistency, tracking, video segmentation) * Experience with foundation models for data annotation * Experience with MLOps tooling (Weights & Biases ...

Experience with video understanding (temporal consistency, tracking, video segmentation) * Experience with foundation models for data annotation * Experience with MLOps tooling (Weights & Biases ...

Experience with video understanding (temporal consistency, tracking, video segmentation) * Experience with foundation models for data annotation * Experience with MLOps tooling (Weights & Biases ...

Experience with video understanding (temporal consistency, tracking, video segmentation) * Experience with foundation models for data annotation * Experience with MLOps tooling (Weights & Biases ...

AI Data Strategist

Redwood City, CA · On-site

$148K - $192K/yr

Experience with embodied AI, video, or time-series data. * Familiarity with evaluation pipelines, active learning, or data-centric AI. * Exposure to annotation tooling such as Labelbox, Scale, CVAT ...

Video alone makes up 80% of internet traffic, and across modalities, data has become the enabling ... Source, onboard, and manage a distributed human workforce for data annotation, curation, and ...

... annotation workflows to support continuous model improvement. * Explore model compression, inference acceleration, and serving optimizations to enable efficient real-time video processing at scale.

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Video Annotation information

What is a Video Annotation job?

A Video Annotation job involves labeling objects, activities, or events within videos to help train machine learning models. Annotators use specialized tools to draw bounding boxes, segment frames, or classify scenes to improve AI's ability to recognize visuals. This work is essential for applications like autonomous vehicles, facial recognition, and action recognition in AI systems.

What are the typical daily responsibilities of a Video Annotation specialist?

As a Video Annotation specialist, your daily tasks will generally involve watching video footage, identifying relevant objects or actions, and accurately labeling or tagging frames according to specific project guidelines. You may also review and validate annotations to ensure quality and consistency, collaborate with team members or project managers to clarify labeling instructions, and document any ambiguities or challenges encountered during annotation. Most roles are structured with clear targets or quotas for completed work, and you may work independently or as part of a larger team supporting AI development projects. The position requires strong concentration and the ability to handle repetitive tasks efficiently while maintaining high standards of accuracy.

What are the key skills and qualifications needed to thrive in the Video Annotation position, and why are they important?

To excel in Video Annotation, you need strong attention to detail, visual analysis skills, and familiarity with video processing concepts, often supported by a diploma or coursework in computer science or a related field. Knowledge of annotation tools such as CVAT, Labelbox, or VGG Image Annotator, and, in some cases, experience with basic scripting or data management platforms, is highly valued. Excellent focus, time management, and the ability to follow precise instructions help individuals stand out in this position. These abilities are crucial for ensuring the accuracy and quality of annotated video data, which directly impacts AI and machine learning model performance.

What are the most commonly searched types of Video Annotation jobs in California? The most popular types of Video Annotation jobs in California are:
What are popular job titles related to Video Annotation jobs in California? For Video Annotation jobs in California, the most frequently searched job titles are:
What job categories do people searching Video Annotation jobs in California look for? The top searched job categories for Video Annotation jobs in California are:
What cities in California are hiring for Video Annotation jobs? Cities in California with the most Video Annotation job openings:
Infographic showing various Video Annotation job openings in California as of July 2026, with employment types broken down into 1% As Needed, 49% Full Time, 44% Part Time, 3% Contract, and 3% Nights. Highlights an 56% Physical, 1% Hybrid, and 43% Remote job distribution.

Research Engineer, Multimodal

Character.AI

Redwood City, CA • On-site

Full-time

Posted 19 days ago


Job description

Job Summary:
Character.AI empowers people to connect, learn and tell stories through interactive entertainment. As a Research Engineer on the Multimodal team, you will build and advance video and image generation models that enhance user interactions with AI characters.
Responsibilities:
• Lead fine-tuning and continued training of video generation models, including image-to-video and joint audio-visual generation.
• Design and experiment with novel model architectures for multimodal generation, including multimodal conditioning (voice, structured text, reference images).
• Leverage techniques such as LoRA, RLHF, and full-parameter fine-tuning to improve model quality across diverse visual scenarios.
• Design and build large-scale data pipelines and automated annotation workflows to support continuous model improvement.
• Explore model compression, inference acceleration, and serving optimizations to enable efficient real-time video processing at scale.
Qualifications:
Required:
• Strong passion for pushing the boundaries of visual AI, with a self-driven, hands-on approach to solving complex technical problems
• Proficient in PyTorch with end-to-end experience across data processing, model training, and deployment
• Solid understanding of video and image generation architectures, including diffusion models, DiT, ControlNet, and SOTA video generation models
• Experience with multimodal model training, including working with audio, vision, and language modalities together
• Experience with distributed training tools (FSDP, DeepSpeed, etc.)
• Experience with large-scale data processing, dataset construction, and automated data cleaning
Preferred:
• Experience with joint audio-visual or speech-conditioned generation models
• Experience with AIGC, video effects, character animation, or asset generation products
• Familiarity with ML deployment and orchestration (Kubernetes, Slurm, Docker, cloud platforms)
• Publications in relevant venues (NeurIPS, ICLR, CVPR, ECCV, ICCV, or similar)
Company:
Character.ai provides open-ended conversational applications in which users create characters and converse with them. Founded in 2021, the company is headquartered in Menlo Park, USA, with a team of 51-200 employees. The company is currently Growth Stage.