Skip to content
BackNov 8
Caio Vinícius O.

Caio Vinícius O.

AI-trainer, marketing professional, and writer

Hey! I'm a 31-year-old economist based in Curitiba, Brazil. Over the last four years, I’ve worked as an AI trainer and data annotation specialist for projects involving instruction tuning, prompt design, and content evaluation. I’ve collaborated with leading companies in the segment, contributing directly to the development of large language models. My focus is on accuracy, consistency, and clarity across a wide range of tasks, including multilingual work in English and Brazilian Portuguese. While writing started as a personal interest, it became part of my professional routine. I’ve produced hundreds of articles across various domains, often aligned with SEO standards. I also have solid experience in proofreading, editing, and translating between English and Portuguese. Occasionally, I write short stories as a hobby. My core competencies include high-volume content production, data analysis, and strategic communication. I’m skilled at adapting tone and structure to fit different audiences, using research-based approaches to ensure clarity and impact. In marketing-related work, I’ve written landing pages, blog posts, and social media content with measurable SEO performance. On the technical side, I’m experienced in handling structured data, creating prompt-based evaluations, and supporting annotation pipelines with precision and efficiency. My English is C2-Level (certified), and I work with high standards of reliability and self-management. My rate starts at $25/hour, with complete transparency and professionalism guaranteed. Thanks for reading. Looking forward to hearing from you.

🇧🇷Curitiba, Brazil$25/hr100% JSS5.00 (15)Since Jan 2021

Earnings and projects

MRR
$102

Last 6 months ÷ 6

World#134,364 / 412k
🇧🇷Country#1,596 / 4,647
Revenue, last 30 days
$0

Last 6 months: $610

Total earnings
$54k

Billed in all: $58k

World#70,910 / 412k
🇧🇷Country#726 / 4,647
Per project
$3k

$610 in the last 6 months

World#55,236 / 412k
🇧🇷Country#674 / 4,647
Projects, last 6 months
1
100% fixed0% hourly
World#128,096 / 412k
🇧🇷Country#1,427 / 4,647
Projects in all
18

Across 21 contracts

81% fixed19% hourly
World#143,610 / 412k
🇧🇷Country#1,125 / 4,647

Earnings, last 30 days

$57.8kNothing earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$56k$57k$58k$59kOct 9Oct 24Nov 8

Skill rankings: Top 22% in Article Writing

Ranked by MRR among everyone on Upwork with the skill.

  1. #134Brazilian Portuguese Dialect462 freelancers · 🇧🇷 #108Top 29%
  2. #326Portuguese987 freelancers · 🇧🇷 #155Top 33%
  3. #1,253Blog Content5,596 freelancers · 🇧🇷 #17Top 22%
  4. #1,254Technical Writing4,718 freelancers · 🇧🇷 #5Top 27%
  5. #2,726Article Writing12,520 freelancers · 🇧🇷 #28Top 22%
  6. #2,958SEO Writing11,348 freelancers · 🇧🇷 #42Top 26%
  7. #2,960Blog Writing13,251 freelancers · 🇧🇷 #33Top 22%
  8. #3,064Editing & Proofreading11,045 freelancers · 🇧🇷 #45Top 28%