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Annotation Engineer Jobs in California (NOW HIRING)

Bedrock Robotics

Agentic Data Understanding

San Francisco, CA · On-site

$134K - $162K/yr

Identify and evaluate new annotation technologies. What We're Looking For: * 8+ years of experience in ML engineering, data engineering, or applied AI - with meaningful time spent building production ...

General Motors

Staff ML Systems Engineer

Sunnyvale, CA · On-site

The Data Labeling Engineering team designs, builds, and operates hybrid human/machine data labeling ... Familiarity with data labeling/annotation platforms or tools used by large labeling workforces (e.g ...

Socket.dev

Operations Engineer (Human Data)

Palo Alto, CA · On-site

$144 - $270/hr

Design and improve annotation workflows, labeling interfaces, and related tools with a focus on data quality and integrity. * Act as a liaison between engineering, technical staff, and tutoring ...

xdof, Inc.

Senior Perception Engineer

San Mateo, CA · On-site

$150 - $210/hr

Build full-body pose estimation systems for motion capture and teleoperation action annotation ... Collaborate with ML engineers and data infrastructure teams to ensure perception output formats ...

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Annotation Engineer information

What does an annotation engineer do?

An annotation engineer is responsible for labeling and annotating data, such as images, text, or videos, to train machine learning models. They use specialized tools and follow guidelines to ensure data quality and accuracy, often working closely with data scientists and AI developers. This role requires attention to detail and knowledge of data annotation processes and tools.

What cities in California are hiring for Annotation Engineer jobs?

Cities in California with the most Annotation Engineer job openings:

Annotation Engineer jobs near you

Data Engine & Annotation Systems Engineer

Simbe Robotics

San Francisco, CA • On-site

$120K - $155K/yr

Full-time

Posted 21 days ago

Job description

Simbe is building the AI powered operating system for physical retail. Our autonomous robots and multimodal computer vision platform turn complex, constantly changing stores into accurate, actionable intelligence for leading retailers around the world. Simbe combines robotics, computer vision, machine learning, data infrastructure, and customer focused product design to help retailers improve shelf availability, price and promo execution, inventory accuracy, and store team productivity.

Simbe is looking for a Data Engine & Annotation Systems Engineer to own the systems, workflows, and tooling that power high quality training data for our computer vision models. This role goes beyond annotation coordination. You will help build the data engine behind Simbe's AI platform: model assisted labeling, data quality checks, annotation guidelines, error mining, dataset versioning, active learning, and evaluation workflows that improve model performance and accelerate customer value.

Why This Role Is High Impact
  • You will help create the feedback loop that makes Simbe's AI systems better every week.
  • You will improve the quality, speed, and reliability of data used to train and evaluate production models.
  • You will work across human annotation, automation, model outputs, QA, and customer impact.
Responsibilities
  • Own annotation systems and workflows. Oversee and improve image and video annotation workflows, including task setup, guideline creation, quality control, edge case handling, and throughput monitoring.
  • Build data engine tooling. Develop Python, web, and automation tools that make it easier to request annotations, review results, clean data, export datasets, and evaluate model performance.
  • Improve data quality. Design checks that identify inconsistent labels, oversized or undersized boxes, missing annotations, duplicate data, class imbalance, and other issues that can degrade model performance.
  • Integrate model assisted workflows. Evaluate and integrate auto annotation, pre labeling, active learning, hard case mining, and model in the loop review systems to improve annotation efficiency.
  • Support dataset versioning and evaluation. Partner with CV engineers to maintain reliable datasets, evaluation splits, benchmark views, and release readiness workflows.
  • Coordinate across teams. Work with annotation teams, Computer Vision, Product, Customer Success, and Data teams to make sure annotation systems support current customer priorities and future product needs.
  • Measure and improve performance. Track annotation quality, turnaround time, capacity, cost, rework rates, and model impact to improve the operating system for data creation.
Required Qualifications
  • 3+ years of experience in software engineering, data tooling, ML data operations, annotation systems, data QA, or related technical work.
  • Strong Python skills, including experience building scripts, data workflows, APIs, or internal tools.
  • Comfort with Bash, Linux, Git, and production debugging workflows.
  • Experience with web frontend or full stack development for internal tools.
  • Strong communication skills and ability to create clear annotation guidelines, documentation, and process improvements.
  • High attention to detail and a strong understanding of how data quality affects model quality.
  • Ability to coordinate across technical and operational teams while still writing code and improving systems.
Bonus Qualifications
  • Experience with CVAT, FiftyOne, Labelbox, Scale, Roboflow, Supervisely, or similar annotation and dataset tools.
  • Experience with image, video, robotics, retail, autonomous vehicle, industrial inspection, or sensor data annotation.
  • Experience with active learning, auto labeling, synthetic data, evaluation dashboards, or dataset versioning.
  • Experience with object detection, segmentation, OCR, barcode localization, or other computer vision workflows.
  • Experience managing external annotation vendors or distributed annotation teams.
$120,000 - $155,000 a year

The base salary offered is based on market location and may vary depending on individualized factors for job candidates, including job related knowledge, skills, experience, and other objective business considerations. Subject to those same considerations, the total compensation package for this position may also include equity compensation, in addition to a full range of medical, financial, and other benefits. Details of participation in these benefit plans will be provided if an employee receives an offer of employment.

Simbe Values: R. E. T. A. I. L.

  • Result Driven - We are customer centric and results driven. We strive to create immense value for our team, partners, customers, and investors.

  • Empathetic - We are sensitive and mindful. We support each other in challenging times, both professionally and personally.

  • Transparent - We value open communication internally, and with our partners and customers. We are receptive to feedback.

  • Agile - We are eager to learn and adapt quickly to changes and customer needs.

  • Innovative - We are bold and innovative, with an intense focus on product design, user experience, and customer value.

  • Leaders - We strive for excellence. We are accountable, the best at what we do, and leaders in our field.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.
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