Fullstack Data Scientist - freelancer

Carbon Data Solutions; United States; Remote; USD 150,000 - 210,000; Full time

Job summary

Carbon Data Solutions seeks an experienced AI engineer to lead GenAI discovery and end-to-end design. You will translate business problems into architectures, build data ingestion and retrieval layers, and orchestrate with LangChain/LlamaIndex.

You will implement RAG pipelines and safe, governance-minded solutions for enterprise use. The role requires strong Python production-grade skills, experience with LLMs and agents, and collaboration across data, product, and full-stack teams.

Qualifications

• 6+ years of experience in Data Science/AI engineering.
• 4+ years of production-ready Python AI code development.
• 2+ years of production-ready LLM-related code development (RAG preferred).
• Strong analytical and problem-solving skills for AI solutions.
• Deep knowledge of Generative AI, LLMs, agents, and RAG mechanisms.
• Experience with GenAI frameworks (LangChain, LlamaIndex, LangGraph).
• Proficiency in Python packaging, testing, and ML service deployment.
• Familiarity with cloud AI services (Azure/GCP/AWS) and CI/CD.

Responsibilities

• Lead discovery and design for GenAI use cases translating business problems into architectures.
• Build end-to-end GenAI applications including data ingestion, retrieval, orchestration, API/backend, and UI where needed.
• Design and implement RAG pipelines with vector DBs, hybrid search, rerankers, and evaluation for robustness.
• Perform model selection, prompting strategies, and fine-tuning (LoRA/QLoRA/SFT).
• Implement safety, governance, and audit controls with human-in-the-loop review when required.
• Collaborate with data engineers, product owners, and full-stack developers on scalable architectures.
• Mentor data scientists/engineers and contribute to internal libraries and templates.
• Stay current with GenAI landscape and validate PoCs.

Skills

GenAI frameworks

Python production code

LLMs

RAG pipelines

LangChain/LlamaIndex

MCP servers/clients

CI/CD

Docker/Kubernetes

Cloud platforms

English communication

Tools

LangChain

LlamaIndex

LangGraph

Job description

Tasks:

• Lead discovery and solution design for GenAI use cases, translating business problems into concrete architectures (LLM decision, RAGs, fine-tuning, agents, guardrails).

• Build end-to-end GenAI applications: data ingestion, retrieval layer, orchestration (e.g. LangChain/LlamaIndex/LangGraph), API/backend, and simple UI where needed.

• Design and implement RAG pipelines with vector databases, hybrid search, rerankers, query transformation, and evaluation frameworks for relevance and robustness.

• Perform model selection, prompting strategies, and fine-tuning (LoRA/QLoRA/SFT) for text, code, and multimodal models, including evaluation and A/B testing.

• Implement safety, compliance, and governance controls (input/output filters, PII handling, audit logs, human-in-the-loop review where required).

• Collaborate with data engineers, product owners, and full-stack developers on scalable architectures, SLAs, and integration with existing enterprise systems.

• Gather technical requirements and estimate planned work.

• Mentor other data scientists/engineers in GenAI patterns, code quality, and best practices; contribute to internal libraries, templates, and reusable components.

• Stay current with GenAI landscape (new open and hosted models, agentic frameworks, evaluation techniques) and perform targeted PoCs to validate them.

What We're Looking For:

• 6+ years of experience in Data Science/AI engineering.

• At least 4+ years of experience in production-ready Python AI-related code development.

• At least 2+ years of experience in production-ready LLM-related code development, preferably based on the Retrieval-Augmented Generation (RAG) concept.

• Strong analytical and problem-solving skills with the ability to optimize AI solutions for diverse applications.

• Strong knowledge and experience in Generative AI, including LLMs, chatbots, AI agents, and RAG mechanisms.

• Deep understanding of LLM evaluators, validators, and guardrails.

• Hands-on experience with one or more GenAI frameworks: LangChain, LlamaIndex, LangGraph, or similar orchestration stacks.

• Hands-on experience designing or operating MCP servers/clients for LLM agents

• Strong Python skills, including production-grade code, packaging, and testing for data/ML services

• Solid understanding of ML/AI concepts: types of algorithms, machine learning frameworks, model efficiency metrics, model lifecycle, AI architectures.

• Proven ability to collaborate effectively across technical and non-technical teams.

• Familiarity with cloud environments such as Azure (preferred), GCP, or AWS, including AI-related managed services.

• Familiarity with CI/CD, testing, and containerized deployments.

• Excellent communication skills in English, with the ability to convey complex technical concepts to various audiences.

What Will Set You Apart:

• Experience in designing and programming ML algorithms and data processing pipelines using Python.

• Good understanding of CI/CD and DevOps concepts, with experience working with selected tools (preferably GitHub Actions, GitLab, or Azure DevOps).

• Experience in productizing ML solutions using technologies like Spark/Databricks or Docker/Kubernetes.

• Experience with agentic AI development frameworks (e.g., BMAD, multi-agent orchestration, spec-driven AI workflows).