Data Annotator

Sigma Software · Ukrainka, Kyiv Oblast, Ukraine

ExclusiveFull-timePublished Jun 16, 2026

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About the role

  • Perform data annotation and labeling tasks for various data formats (images, video, audio, etc.) using appropriate tools and techniques
  • Apply classification, tagging, bounding boxes, segmentation, or other annotation methods according to project requirements
  • Prepare, clean, and structure raw data for Machine Learning pipelines
  • Ensure accuracy, completeness, and consistency of annotations in line with established guidelines
  • Conduct self-checks and participate in internal quality review processes
  • Identify and escalate inconsistencies or anomalies in datasets
  • Collaborate with Machine Learning Engineers, Data Scientists, and other stakeholders to clarify requirements and improve data quality
  • Maintain basic documentation related to datasets and annotation processes
  • Follow data handling, security, and privacy protocols
  • Track progress, meet deadlines, and proactively report issues
  • Contribute to the improvement of annotation guidelines and processes
  • Solid understanding of data annotation and labeling processes
  • Experience or readiness to work with annotation tools (e.g., CVAT, Label Studio, Supervisely)
  • Good understanding of Machine Learning / Computer Vision pipelines
  • Ability to work with large volumes of structured and unstructured data
  • Strong computer literacy and data handling skills
  • Intermediate or higher level of English, both written and spoken

PERSONAL PROFILE

  • High attention to detail and accuracy
  • Ability to perform repetitive tasks without quality degradation
  • Strong discipline and structured approach to work
  • Responsibility for results and quality of output
  • Ability to follow guidelines and instructions precisely

Skills

  • Python
  • SQL
  • pandas
  • NumPy
  • scikit-learn
  • English

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