Freelance Data Scientists in United StatesFreelance Data Scientists in United States
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Ari Harrison's avatar
Ari Harrison
proSan Francisco, USA
AI & ML Engineer
$1k+
Earned
7x
Hired
28
Followers
AI & ML Engineer
Cover image for BioBERT Attention Visualization Tool An interactive
BioBERT Attention Visualization Tool An interactive web application for visualizing attention mechanisms in BioBERT on biomedical text. This tool helps researchers and practitioners understand how transformer models process biomedical language by providing intuitive visualizations of attention patterns.
1
115
Cover image for Open-source REST API for molecular
Open-source REST API for molecular dynamics simulations, protein-ligand docking, and conformational analysis. Features SMILES to OpenMD Conversion: Convert SMILES strings to OpenMD format files with real 3D optimization Comprehensive Property Calculation: 32+ molecular descriptors calculated from real 3D coordinates Multiple Force Fields: Support for AMBER, CHARMM, OPLS, and GROMOS force fields Real Calculations Only: No mock data - all properties derived from actual 3D structures
1
131
Cover image for Clinical Trial Success Predictor
Clinical Trial Success Predictor
2
132
Cover image for Tesla Stock Price Dashboard
Tesla Stock Price Dashboard
1
47
Data Scientist(4)
Solomon Bilancieri's avatar
Solomon Bilancieri
Florida, USA
Transforming data into compelling stories with PowerBI
5.0
Rating
3
Followers
Transforming data into compelling stories with PowerBI
Cover image for Optimizing Sales Data with PowerBI
Optimizing Sales Data with PowerBI
1
44
Cover image for VideoGame Tool - What to Train Next Determination Tool using API
VideoGame Tool - What to Train Next Determination Tool using API
1
40
Cover image for Microsoft PowerBI Dashboards/Reports
Microsoft PowerBI Dashboards/Reports
1
40
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Data Scientist(3)
VJ Sojitra's avatar
VJ Sojitra
Columbus, USA
AI Engineer | Agentic Systems & Automation | MLOps
New to Contra
AI Engineer | Agentic Systems & Automation | MLOps
Cover image for I developed an AI-assisted document-intelligence
I developed an AI-assisted document-intelligence workflow for transportation-agency teams working with large collections of reports, standards, studies, scanned documents, and project records. The system combined document extraction, OCR, structured metadata, semantic retrieval, knowledge relationships, and grounded LLM responses. Analysts could ask questions in natural language, review the supporting evidence, inspect source citations, and approve, revise, or reject generated findings. The workflow was designed around human review, access controls, traceability, and safe failure rather than treating an LLM response as an unquestionable answer. Related work reduced decision time by approximately 60% and improved data accuracy by approximately 35%. The displayed architecture and interface are sanitized representations and contain no client documents, production data, proprietary prompts, or confidential system details.
0
117
Cover image for I engineered a large-scale package-network
I engineered a large-scale package-network intelligence pipeline using Azure Databricks and PySpark. The system joined approximately 4.5 billion historical records and transformed them into reusable fingerprint signals covering package movement and network behavior. I developed time-windowed feature logic using native Spark expressions rather than Python UDFs, preserving distributed performance at scale. The pipeline produced an approximately 200-million-row fingerprint dataset and a 22-million-row operational output that classified package activity along a cold-to-hot temperature scale. The resulting signals supported downstream monitoring, prioritization, and operational analysis. The architecture shown here is a sanitized representation; client identifiers, proprietary schemas, infrastructure paths, and business rules have been removed.
1
154
Cover image for Last week I shipped a
Last week I shipped a full learning platform: two audience journeys (students + tutors), subscriptions and digital-product sales, lead capture, blog — built solo, end to end.
1
111
Cover image for I designed and engineered a
I designed and engineered a hierarchical multi-agent orchestration framework for coordinating complex AI-assisted engineering and analytical work. A central orchestrator assigns bounded tasks to specialized builder, analyst, reviewer, and verification agents. Execution follows an explicit dependency graph, while shared evidence, acceptance gates, negative-path testing, and checkpointed state prevent agents from declaring work complete without proof. The framework supports targeted retries, rollback, and recovery from the first incomplete node instead of restarting an entire workflow. It also separates implementation from independent review, reducing the risk of an agent validating its own unsupported conclusions. This independent engineering project demonstrates how agentic systems can be made more controlled, observable, and recoverable. The architecture and control interface are representative views of the framework rather than screenshots containing private execution data.
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51
Data Scientist(2)
Yan Vishnepolsky's avatar
Yan Vishnepolsky
Honolulu, USA
Quant & Qual Bilingual User Experience (UX) Researcher🔬
Quant & Qual Bilingual User Experience (UX) Researcher🔬
Cover image for Email Study for a University, 2021
Email Study for a University, 2021
1
8
Cover image for Card Sort Study
Card Sort Study
1
7
Cover image for UX Research Democratization, 2023
UX Research Democratization, 2023
1
8
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Data Scientist(2)
Nima T's avatar
Nima T
Pasadena, USA
Ph.D. EE | Data Science & ML, Intelligent Energy Systems
Ph.D. EE | Data Science & ML, Intelligent Energy Systems
Cover image for Semi-Supervised Event Identification in Electric Power Systems
Semi-Supervised Event Identification in Electric Power Systems
0
25
Cover image for A Machine Learning Framework for Event Identification
A Machine Learning Framework for Event Identification
0
6
Cover image for Algorithm for Source Localization in Linear Dynamical Systems
Algorithm for Source Localization in Linear Dynamical Systems
0
6
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Data Scientist(2)