Senior Data Engineer

Position: Senior Data Engineer

Location: SAN JOSE, CA***Onsite***

Duration: 1 Year

Responsibilities

• Lead the end-to-end migration (transformation and load) of high-volume, high-complexity data into a new PostgreSQL-based infrastructure
• Design, build, and maintain robust ETL/ELT pipelines capable of processing millions of records reliably and efficiently
• Map and reconcile complex legacy data structures across multiple business entities into a unified target schema
• Define and implement data validation frameworks to ensure integrity, completeness, and accuracy throughout the migration
• Optimize pipeline performance, including query tuning, indexing strategy, and batch/incremental load design in PostgreSQL
• Identify, troubleshoot, and resolve data quality issues, schema mismatches, and pipeline failures
• Document data mappings, transformation logic, and migration runbooks for engineering and business stakeholders
• Partner with business and technical stakeholders to align migration scope, timelines, and data requirements
• Establish monitoring, logging, and alerting to track pipeline health and data quality post-migration
• Mentor junior data engineers and contribute to engineering best practices and standards

Required Qualifications

• 5+ years of experience in data engineering, with demonstrated ownership of large-scale data migration projects
• Strong to expert-level proficiency in Python for building and automating data pipelines
• Deep hands-on experience with PostgreSQL/Oracle , including schema design, query optimization, and performance tuning
• Proven experience designing and managing ETL/ELT pipelines at scale (millions of records)
• Experience mapping and transforming complex, legacy data structures across disparate systems or business entities
• Strong understanding of data validation, reconciliation, and quality assurance techniques
• Solid grasp of data modeling principles (normalization, indexing, partitioning)
  Experience with version control (Git) and CI/CD practices for data pipelines

Preferred Qualifications

• Experience with orchestration tools (e.g., Airflow, Dagster, Prefect)
• Familiarity with cloud data platforms (AWS, GCP, or Azure)
• Experience with other relational or NoSQL databases and cross-database migrations
• Background working in regulated or high-stakes data environments (finance, healthcare, etc.)
• Experience with containerization (Docker) and infrastructure-as-code
• Exposure to data quality/testing frameworks (e.g., Great Expectations, dbt tests)

What Success Looks Like

• A fully migrated, validated dataset in PostgreSQL with zero critical data loss or corruption
• ETL/ELT pipelines that are documented, repeatable, and optimized for ongoing operation
• A clear audit trail of data lineage and validation results across all business entities involved