Nineleaps - Senior Data Engineer

About the Role : We're looking for a Senior Data Engineer with strong data architecture and system design skills to design, build, and own end-to-end production pipelines powering analytics and decision-making across the org. The role centers on deep Python + SQL expertise, robust transaction-level fact tables, and rigorous data quality and auditability, ideally within a finance, risk, or compliance data domain. What You'll Do : - Own data architecture and system design decisions for pipelines and data models - grain, partitioning, schema evolution, and scalability tradeoffs. - Take end-to-end ownership of pipelines in production : design, build, deploy, monitor, and operate. - Design and build transaction tables (append-only, immutable event/transaction-grain fact tables) alongside standard fact/dimension models using medallion (bronze/silver/gold) architecture. - Build and support pipelines for finance, risk, or compliance use cases where accuracy, auditability, and data lineage are critical. - Implement data quality and auditability controls : validation checks, reconciliation logic, anomaly detection, and audit trails for every pipeline you own. - Write complex, cross-dialect SQL (MySQL + PostgreSQL) : window functions, multi-layered CTEs, CASE-driven logic, COALESCE/NULLIF, type casting, and date/timestamp handling. - Build idempotent reload patterns (DELETE+INSERT), UNION ALL/set operations, and templated (Jinja-style) SQL including handling for late-arriving/corrected transaction records without double-counting. - Orchestrate Airflow-style DAGs (Pipeline/BaseTask, ExternalTaskSensor for cross-pipeline deps) with secure credential handling via uSecret. - Build Python ETL tooling : pandas (CSV <-> DB), SQLAlchemy + raw drivers (MySQLdb, psycopg2), type hints/dataclasses, class-based pipeline design. - Integrate with Google Drive/Sheets APIs; build YAML-driven pipeline configs; handle Piper staging/user_staging quirks. - Own CI/CD for pipelines via standard Git workflows. - Use internal stack day-to-day : OneETL for pipeline authoring, Piper/uWorc for scheduling, Databook for lineage, uSecret for credentials, DSW notebooks for CSV/table work, SourceGraph for code search, Query Builder for ad hoc SQL. - Document data models and pipeline logic for maintainability, keeping compliance/audit needs in mind. What We're Looking For : - 6+ years in data engineering. - Strong data architecture and system design skills to make sound tradeoffs on modeling, partitioning, and scalability. - Demonstrated end-to-end production ownership of data pipelines from design through deployment, monitoring, and operational support. - Expert-level Python + SQL as the primary toolset. - Robust data quality and auditability practices - validation, reconciliation, anomaly detection, audit trails. - Experience working with finance, risk, or compliance data. - Proven experience designing and building transaction/fact tables. - Strong Python (pandas, SQLAlchemy, type hints/dataclasses, class-based pipelines). - Airflow-like orchestration experience. - Solid data modeling fundamentals (fact/dim, normalization, medallion architecture). - YAML-based config experience; standard CI/CD and Git workflows.