Walter Seyfarth

I’m an AI Data Trainer with experience supporting both enterprise-level and startup products. I specialize in manual and exploratory testing, video annotation, and training large AI models. I’ve worked remotely with cross-functional teams across the US and Europe, consistently delivering accurate, high-quality results on tight deadlines.

At Invisible Technologies, I contributed to improving machine learning models through video captioning, annotation, and validation tasks. I bring strong attention to detail, excellent communication skills, and a passion for clean data and effective user experiences.

I’m available for remote freelance projects in:

• Quality Analysis
• Data Annotation & Validation (Video, Text, Image)
• AI Training Tasks (Reinforcement Learning, Prompt Evaluation, etc.)
• Bug Reporting, Usability Testing, and Documentation
• Junior Recruiting positions
• Management