Mario M.
Senior Data Quality Specialist | Search Evaluation & AI Training
⭐ Top Rated Specialist | 12,900+ Verified Hours | 100% Job Success I specialize in high-scale data management and precision-driven QA. With almost 13,000 hours of experience—including work on enterprise-level projects for global tech companies—I provide the reliability and technical accuracy that large-scale operations require. 💡 What I Do Best: • Data Integrity & Cleansing: I transform chaotic datasets into structured, audit-ready information. I have a zero-tolerance policy for inconsistencies. • AI Training & Annotation: High-precision data labeling and image annotation for computer vision. I deliver the high-quality "ground truth" data necessary for AI models. • Strategic Web Research: Detailed collection and verification of information. I focus on finding actionable insights, not just raw data. • Complex Data Organization: Advanced management of Excel, Google Sheets, and internal databases to streamline your workflow. 🛠 Why Collaborate With Me? • Proven Scale: 12,400+ hours is a guarantee of a battle-tested workflow. • Team Synergy: I have worked independently, as well as effectively within large international teams. This experience allows me to adapt quickly and provide value to clients in diverse projects. • Reliability: Whether it’s a short-term task or a longer project, I’m committed to delivering high-quality results on time, so you can focus on what matters most. 🌍 Ready to secure your data integrity. Available for immediate start on both short-term and long-term projects.
Earnings and projects
Last 6 months ÷ 6
Last 6 months: $10
Billed in all: $67,919$68k
$10 in the last 6 months
Across 2 contracts
Across 23 contracts
Earnings, last 30 days
Skill rankings: Top 42% in English to Croatian Translation
Ranked by MRR among everyone on Upwork with the skill.
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- #45English to Croatian Translation107 freelancers · 🇭🇷 #18Top 42%🇭🇷#18 of 51
- #288Lead Generation Analysis587 freelancers · 🇭🇷 #1Top 49%🇭🇷#1 of 1
- #396Spreadsheet Skills777 freelancers · 🇭🇷 #2Top 51%🇭🇷#2 of 3
- #416Image Annotation592 freelancers · 🇭🇷 #1Top 70%🇭🇷#1 of 1
- #1,289Data Management2,504 freelancers · 🇭🇷 #4Top 51%🇭🇷#4 of 6
- #2,140Data Cleaning3,952 freelancers · 🇭🇷 #2Top 54%🇭🇷#2 of 3
- #2,488Content Strategy4,813 freelancers · 🇭🇷 #4Top 52%🇭🇷#4 of 10