Data Engineer

What You'll Build Core Responsibilities Data Architecture & Infrastructure (40%) ● Design and implement a multi-database architecture (MongoDB, Redis, Milvus, Neo4j, BigQuery) ● Build scalable data pipelines for real-time conversation processing and personalization● Architect ETL/ELT workflows for data migration from legacy systems● Implement data partitioning, sharding, and optimization strategies for high-throughput systems ● Create data governance frameworks ensuring quality, security, and compliance Vector & Graph Database Systems (25%)● Design and optimize Milvus vector collections for semantic search (1024-dim embeddings) ● Build graph schemas in Neo4j for customer journey mapping and persona relationships● Implement HNSW indexing strategies and similarity search optimization● Create hybrid search systems combining vector, full-text, and graph queries● Monitor and tune database performance (query latency, throughput, resource utilization) ML Data Infrastructure (20%) ● Build data collection pipelines for LLM fine-tuning (conversation logs, tool executions)● Create feature stores for GNN training (customer interactions, engagement signals)● Implement data versioning and lineage tracking for ML experiments ● Design A/B testing data infrastructure with CUPED variance reduction● Build real-time feature computation pipelines for contextual bandits Analytics & Monitoring (15%) ● Design BigQuery schemas for marketing analytics and performance tracking● Create materialized views and aggregation pipelines for real-time dashboards● Implement data quality monitoring and anomaly detection ● Build observability infrastructure (Prometheus metrics, Grafana dashboards)● Develop cost optimization strategies for cloud data warehousing Technical Stack You'll Work With Databases & Storage ● MongoDB (conversation state, active sessions) ● Redis (caching, rate limiting, real-time data) ● Milvus (vector embeddings, semantic search) ● Neo4j (customer journey graphs, persona networks) ● BigQuery (analytics warehouse, historical data) Data Processing & Orchestration ● Apache Airflow or Prefect (workflow orchestration) ● Pandas, Polars (data transformation) ● Apache Spark (optional - for large-scale processing) ● dbt (data transformation and modeling) ML/AI Data Pipeline ● vLLM (LLM inference serving) ● MLflow (model registry, experiment tracking)● Sentence Transformers (embedding generation) ● PyTorch, TensorFlow (ML model training) Cloud & Infrastructure ● Google Cloud Platform (BigQuery, Cloud Storage, Compute) ● Docker & Kubernetes (containerization, orchestration) ● Terraform (infrastructure as code) ● GitHub Actions or GitLab CI (CI/CD pipelines) Programming & Tools ● Python 3.10+ (primary language) ● SQL (complex queries, query optimization) ● Shell scripting (Bash/Zsh) ● Git (version control) Requirements Must-Have Skills ● 5+ years of data engineering experience with production systems● Expert-level SQL and database design skills ● Strong Python programming (async/await, type hints, testing) ● Experience with at least 3 different database technologies (SQL, NoSQL, Vector, Graph) ● Proven track record building high-scale data pipelines (>1M records/day)● Deep understanding of data modeling (dimensional, normalized, denormalized)● Experience with cloud data warehouses (BigQuery, Redshift, or Snowflake)● Strong knowledge of data quality, validation, and governance ● Excellent debugging and optimization skills Highly Desirable ● Experience with vector databases (Milvus, Pinecone, Weaviate, Qdrant)● Experience with graph databases (Neo4j, ArangoDB, Neptune) ● Knowledge of embedding models and semantic search ● Experience with ML data pipelines (feature stores, model training data)● Understanding of A/B testing and experimental design ● Experience with real-time streaming (Kafka, Pub/Sub, Kinesis) ● Knowledge of LLMs and conversational AI systems ● Experience with data migration projects (especially large-scale) ● Background in marketing technology or customer data platformsNice-to-Have ● Experience with PyTorch Geometric or graph neural networks ● Knowledge of marketing analytics (attribution, segmentation, personalization)● Familiarity with LangChain, LangGraph, or agent frameworks ● Experience with cost optimization in cloud environments ● Contributions to open-source data engineering projects ● Experience with data compliance (GDPR, CCPA) Key Projects You'll Own Phase 1: Foundation ● Migrate 10M+ conversation vectors from Pinecone to Milvus ● Design and implement MongoDB schemas for real-time agent state● Set up Neo4j graph database with customer journey models ● Create BigQuery data warehouse with partitioned tables Phase 2: Optimization ● Build automated data quality monitoring system ● Implement caching strategies (Redis) for 10x latency reduction ● Optimize vector search queries (target: