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Leon H.

Leon H.

AI & Machine Learning | RAG | Natural Language Processing

I specialize in developing innovative AI and machine learning solutions with a focus on deep learning and natural language processing. My experience includes utilizing Python, PyTorch, and Huggingface to create models that tackle complex problems and enhance data-driven decision-making. With a Master of Science in Computer Science and a Bachelor’s in Information Technology, I have a strong technical foundation complemented by excellent problem-solving and collaboration skills. I thrive in dynamic environments where I can contribute to cutting-edge projects. If you need a forward-thinking engineer ready to turn ideas into impactful solutions, I’m here to help. Let’s connect and discuss how I can support your goals. I have experience building RAG systems, a lot of experience in training transformer models for retrieval but also for text classification. Plus, I have Web Dev experience with FastAPI and React, and AWS.

🇩🇪Berlin, Germany$25/hr90% JSSSince May 2026

Earnings and projects

MRR
$2.3k

Last 6 months ÷ 5.1 months active (since Jun 2026)

World#19,134 / 412k
🇩🇪Country#143 / 3,842
Revenue, last 30 days
$3.2k

Last 6 months: $12k

World#11,496 / 412k
🇩🇪Country#83 / 3,842
Total earnings
$12k

Billed in all: $12k

World#183,353 / 412k
🇩🇪Country#1,438 / 3,842
Per project
$5.9k

$12k in the last 6 months

World#29,497 / 412k
🇩🇪Country#168 / 3,842
Projects, last 6 months
1
100% fixed0% hourly
World#128,092 / 412k
🇩🇪Country#1,059 / 3,842
Projects in all
2
100% fixed0% hourly
World#328,886 / 412k
🇩🇪Country#3,182 / 3,842

Earnings, last 30 days

$12.3k+$3.2k earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$8k$10k$12k$14kOct 8Oct 23Nov 7

Skill rankings: #1 in 1 skill of 15

Rarest: top 1% in NLTK, of 84. Ranked by MRR among everyone on Upwork with the skill.

  1. 1NLTK84 freelancers · 🇩🇪 #1Top 1%
  2. #17Hugging Face300 freelancers · 🇩🇪 #1Top 6%
  3. #19NumPy587 freelancers · 🇩🇪 #2Top 3%
  4. #26Python Scikit-Learn555 freelancers · 🇩🇪 #2Top 5%
  5. #55pandas1,317 freelancers · 🇩🇪 #2Top 4%
  6. #94PyTorch1,585 freelancers · 🇩🇪 #1Top 6%
  7. #347Git5,766 freelancers · 🇩🇪 #5Top 6%
  8. #397FastAPI4,337 freelancers · 🇩🇪 #6Top 9%