William Thomsen
Grindsted
Summary
Strategic and analytical data annotation specialist with 7+ years of successful freelance experience creating high-quality training datasets and language services. Fluent in Danish and English with specialization in NLP annotation, content localization, and cross-cultural communication. Established and scaled an independent business serving 30+ clients across technology, research, and digital content sectors. Recognized for precise annotation, strong business acumen, and ability to manage complex projects independently with outstanding quality standards.
Overview
11
11
years of professional experience
1
1
Certification
Work History
Independent AI Training Consultant
04.2019 - Current
- Provide expert consultation on training data quality for AI applications
- Develop annotation guidelines and quality standards for client projects
- Create custom taxonomies and classification systems for various industries
- Train client teams in annotation methods and workflow optimization
- Advise on data collection strategies and bias reduction
- Maintain long-term consulting relationships with technology companies
Freelance Localization Expert
05.2017 - Current
- Provide comprehensive localization services for software, websites, and digital products
- Specialize in technical documentation, user interfaces, and marketing materials
- Adapt content for Danish and Scandinavian markets with cultural sensitivity
- Manage end-to-end localization projects including planning, translation, and testing
- Maintain terminology databases and style guides for consistent deliverables
- Developed expertise in technology, finance, and gaming industries
- Handle all aspects of business operations independently including contracts, deliveries, and client relations
Independent Data Annotation Specialist
02.2016 - Current
- Built and scaled a successful freelance annotation business with stable annual revenue
- Create premium training datasets for AI applications, machine learning, and natural language processing
- Specialize in text classification, intent recognition, sentiment analysis, and entity extraction
- Annotate 50,000+ text segments, 30,000+ images, and 700+ hours of audio content annually
- Maintain 99.7% accuracy rate through systematic quality control
- Developed methodical business operations for client acquisition, project management, and quality assurance
- Cultivated long-term relationships with technology companies and research institutions
- Successfully transitioned from platform-based work to direct enterprise contracts
Platform-based Data Specialist
01.2014 - 01.2016
- Provided high-quality annotation services through major crowdsourcing platforms
- Specialized in text classification, content moderation, and data labeling
- Maintained highest quality tier across multiple platforms
- Completed 180+ annotation projects with exceptional client ratings
- Built the foundation of skills and reputation that launched independent career
Education
Master's Degree - Business Language and International Business Communication
University of Southern Denmark
01.2014
Bachelor - Computer Science, Minor in Linguistics
Aarhus University
01.2012
Skills
- Annotation Skills:
- Text classification and categorization
- Named entity recognition
- Sentiment and intent analysis
- Image labeling and segmentation
- Audio transcription and classification
- Cross-lingual data alignment
- Data quality assessment and bias identification
- Freelance Business Management:
- Client acquisition and relationship building
- Project scoping and accurate estimation
- Contract negotiation and terms setting
- Financial management and planning
- Marketing and personal branding
- Time management and productivity systems
- Business scaling strategies
- Technical Skills:
- Scale AI, LabelBox, CVAT, Appen platforms
- SDL Trados, MemoQ, Wordfast
- Project management software
- Quality assessment tools
- Microsoft Office & Google Workspace
- Python scripting for annotation automation
Certification
- Professional Certifications:
- Senior Data Annotation Professional - Scale AI (2022)
- Certified Translation & Localization Specialist - SDL (2019)
- Freelance Business Management - CreativeLive (2018)
- Machine Learning Data Engineering - DataCamp (2020)
- Project Management for Independents - PMI (2017)
Languages
Danish
Bilingual or Proficient (C2)
English (fluent professional proficiency)
Bilingual or Proficient (C2)
Timeline
Independent AI Training Consultant
04.2019 - Current
Freelance Localization Expert
05.2017 - Current
Independent Data Annotation Specialist
02.2016 - Current
Platform-based Data Specialist
01.2014 - 01.2016
Bachelor - Computer Science, Minor in Linguistics
Aarhus University
Master's Degree - Business Language and International Business Communication
University of Southern Denmark
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