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ARAR·Buenos AiresRemotemid
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Quick Summary

Overview

Role Overview We are seeking a Freelance Data Scientist with availability to handle multiple projects, who can lead complex data initiatives, design robust models,

Technical Tools
Other

This role requires deep expertise in statistics, machine learning, and data modeling, along with the ability to mentor others, define best practices, and work closely with engineering, product, and leadership teams. Exposure to modern AI and LLM-based systems is a strong plus.

Responsibilities

~1 min read
  • →Lead end-to-end data science projects from problem definition to production deployment
  • →Design, build, and optimize advanced statistical and machine learning models
  • →Analyze large-scale, structured and unstructured datasets to generate actionable insights
  • →Define data science best practices, modeling standards, and evaluation frameworks
  • →Design and analyze experiments (A/B tests, causal analysis, hypothesis testing)
  • →Partner with product, engineering, and business stakeholders to influence strategy and roadmap
  • →Review and improve existing models for accuracy, scalability, and robustness
  • →Mentor junior data scientists and review analytical work
  • →Clearly communicate complex findings to senior stakeholders and leadership
  • →Ensure data quality, reproducibility, and documentation across projects

Requirements

~1 min read
  • Expert-level proficiency in Python (Pandas, NumPy, Scikit-learn)
  • Strong foundation in statistics, probability, and linear algebra
  • Extensive experience with machine learning techniques (regression, classification, clustering, time-series, anomaly detection)
  • Strong hands-on experience with SQL and relational databases
  • Experience working with large datasets and complex data pipelines
  • Deep understanding of model evaluation, bias/variance trade-offs, and performance monitoring
  • Proven experience taking models from development to production

Nice to Have

~1 min read
  • Hands-on experience with Large Language Models (LLMs) such as GPT, Claude, LLaMA, or similar
  • Experience integrating LLM APIs into production systems
  • Strong understanding of prompt engineering and output evaluation
  • Experience with embeddings, semantic search, and vector similarity techniques
  • Knowledge of Retrieval-Augmented Generation (RAG) architectures
  • Experience working with vector databases (Pinecone, FAISS, Weaviate, Milvus, etc.)
  • Awareness of AI risks such as hallucinations, bias, security, privacy, and cost optimization
  • Strong ownership and decision-making ability
  • Proven ability to mentor and guide team members
  • Excellent communication skills with both technical and non-technical audiences
  • Business-first mindset with the ability to balance speed, accuracy, and impact
  • Comfortable working in ambiguous, fast-moving environments
  • Bachelor’s or Master’s degree in Computer Science, Data Science, Statistics, Mathematics, Engineering, or related field
  • Equivalent real-world experience is highly valued

Location & Eligibility

Where is the job
Buenos Aires, AR
Remote within one country
Listed under
Ar

About this job

Posted
206 days ago

Listing Details

Posted
March 23, 2026
First seen
March 27, 2026
Last seen
October 15, 2026

Posting Health

Days active
201
Repost count
0
Trust Level
30%
Scored at
October 15, 2026

Signal breakdown

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