Lead Data Engineer with AI experience

Key Responsibilities:

Data Pipeline Engineering : Build, test, and maintain production pipelines (batch & real-time) on Snowflake, PySpark, Delta Lake, and Kafka.
Implement data quality checks, schema validation, and alerting at every pipeline stage.
Migrate legacy ETL/DWH to cloud-native AWS/Azure architectures with measurable latency and cost improvements. 
Maintain CI/CD pipelines: automated testing, deployment, rollback, and IaC (Terraform, GitHub Actions). 
 
RAG, Vector & Retrieval Infrastructure: Build end-to-end retrieval infrastructure: document ingestion, embedding pipelines, vector store management (Pinecone, FAISS, ChromaDB, OpenSearch), and hybrid retrieval layers.
Implement chunking, metadata filtering, and re ranking — tuning for precision, recall, and latency. 
Maintain data freshness and index consistency; instrument with context relevance and faithfulness metrics.
 
Semantic Layer & Knowledge Infrastructure: Implement and maintain business entity mappings, ontologies, and knowledge graphs (Neo4j) per Architect design.
Build and version the feature store and semantic data contracts serving both ML models and LLM applications.
Manage metadata, data lineage, and audit trail instrumentation across the platform.
 
ML/LLMOps Pipeline Support: Build ML data infrastructure: training curation, feature engineering, MLflow experiment tracking, dataset versioning.
Support LLM fine-tuning workflows — corpus curation, quality filtering, dataset formatting.
Implement automated evaluation pipelines: factual accuracy, hallucination detection, regression tracking.
Maintain production monitoring dashboards for pipeline health, model metrics, and alerting.
 
Agentic Data Infrastructure: Build and maintain data APIs, tool schemas, and memory/state stores that autonomous agents depend on.
Implement agent observability: capture inputs, retrieved context, tool calls, reasoning traces, and outputs.
Maintain text-to-SQL layers, semantic query interfaces, and context APIs for conversational AI consumers.
 
Governance, Security & Data Quality: Implement RBAC, attribute-based access, PII detection/masking, data classification, and audit logging.
Enforce data contracts and schema governance with automated breaking-change detection and versioned migrations.
Build data quality monitoring (completeness, freshness, consistency) with automated alerting and root-cause tooling.
Support compliance readiness: audit trails, data provenance, and regulatory documentation. 

Qualifications:

• 7+ years data engineering using Cloud services
• 2+ years production AI/ML or LLM-era data infrastructure. Proven experience building production pipelines at scale — batch and streaming, Snowflake,AWS/Azure. 
• Deep expertise: Python, PySpark, Snowflake, Delta Lake, Kafka, Spark Structured Streaming. 
• Hands-on with vector stores, embedding pipelines, and retrieval infrastructure in production RAG environments.
• Working knowledge of MLOps: MLflow, CI/CD for AI, automated evaluation, and production monitoring.
• Strong grounding in data governance, quality frameworks, and compliance-
  aligned engineering.

Technical Skills:

• Primary skills: Python, SQL, PySpark, Kafka, Snowflake/DataBricks, Delta Lake, AWS (S3, Glue, Kinesis, EKS, Redshift), Docker, Kubernetes, GitHub Actions.
• Secondary Skills : LangChain, LlamaIndex, LLM APIs (OpenAI, Bedrock, Claude, HuggingFace), Pinecone, FAISS, ChromaDB, OpenSearch, MLflow, FastAPI, Neo4j,  LangGraph, prompt engineering, RLHF dataset prep, LLM fine-tuning workflows

What It's Like to Work at 3Pillar:

At 3Pillar, we create an environment where people can do their best work while maintaining a healthy work-life balance.

Flexibility & Well-being – Our remote-first approach gives you the flexibility to work where you perform best, while prioritizing your well-being and personal commitments.
Global Community – Collaborate with talented colleagues across the globe in a culture built on connection, support, and shared success.
Your Voice Matters – We foster open communication and multiple feedback channels, ensuring every employee has the opportunity to be heard and make an impact.
Growth & Development – Gain exposure to diverse clients, industries, and challenges that accelerate learning and career growth.

Our culture is guided by four core values: Collaboration, Outperform, Respect, and Evolve—the principles that shape how we work, grow, and succeed together.