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Sebastian B.
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Sebastian B.

AI Engineer | Specialized in LLM Fine-Tuning, RAG Pipelines

AI Engineering Lead and PhD researcher in AI/ML, certified in Claude by Anthropic. I design and ship production systems built around Claude: agents, RAG pipelines, and automations that actually make it to deployment Over the past 7 years I've helped more than 20 companies put AI into production across the US, Europe, and the Middle East. I've led engineering teams at startups large and small, and I bring a consistent track record as a high performer on the work I take on I post regularly on Medium, X, and YouTube on the latest in AI, ML, and tech, which keeps me on top of how fast the field moves, with an audience of over 10,000 across platforms. I share this work publicly partly because teaching a thing is the best test of whether you understand it What I build: - RAG chatbots and agents over your documents, PDFs, Notion, and knowledge bases - LLM fine-tuning on your domain data - Workflow automations that replace 40–80% of manual operations - Solution architecture, so you commit to the right stack the first time - Recovery work on stalled or underperforming AI projects Send over the project and I'll reply the same day with a plan, a clarifying question, or an honest pass

🇷🇴Iasi, Romania$40/hr100% JSS5.00 (6)Since Oct 2025

Earnings and projects

MRR
$218

Last 6 months ÷ 6

World#110,443 / 412k
🇷🇴Country#480 / 2,286
Revenue, last 30 days
$0

Last 6 months: $1.3k

Total earnings
$9.7k

Billed in all: $10k

World#199,329 / 412k
🇷🇴Country#1,186 / 2,286
Per project
$1.1k

$653 in the last 6 months

World#118,565 / 412k
🇷🇴Country#681 / 2,286
Projects, last 6 months
2
50% fixed50% hourly
World#88,921 / 412k
🇷🇴Country#379 / 2,286
Projects in all
9

Across 10 contracts

60% fixed40% hourly
World#212,270 / 412k
🇷🇴Country#1,332 / 2,286

Earnings, last 30 days

$10.4kNothing earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$10.2k$10.4k$10.6k$10.8kOct 9Oct 24Nov 8

Skill rankings: Top 25% in Python

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