Position: Senior PySpark ETL Engineer

Role Summary
The Senior PySpark ETL Engineer is responsible for designing, building, optimizing, and operating scalable data pipelines using Apache Spark (PySpark). This role focuses on high volume batch (and optionally streaming) data processing, ensuring performance, reliability, data quality, and cost eciency across enterprise data platforms.

The position requires strong python, hands on Spark expertise, deep SQL and data modeling knowledge, and the ability to own pipelines end to end in production.

Mandatory Requirements

10 - 12 years of overall IT experience, with strong focus on data engineering and ETL.

3+ years of hands on experience with PySpark / Apache Spark in production environments.

Strong experience designing and implementing ETL / ELT pipelines at scale.
Excellent knowledge of SQL and relational data concepts.

Experience handling large datasets in distributed environments.

Strong ownership mindset, problem solving skills, and ability to independently handle production pipelines.

Core Technical Skills

PySpark & Spark Engineering

Deep expertise in PySpark:
DataFrames, Spark SQL, window functions, joins, aggregations
Spark execution model (DAGs, stages, tasks)

Strong hands on experience with:
Partitioning strategies
Shuffle optimization
Broadcast vs sort merge joins
Caching / persisting
Handling data skew and memory spills

Proven ability to debug and optimize slow Spark jobs.

ETL & Data Engineering:

Strong knowledge of ETL/ELT design patterns:
Incremental loads
Watermarking
Idempotent pipeline design
Reprocessing and backfill strategies

Experience implementing:
SCD Type 1 / Type 2
Deduplication and late arriving data handling
Ability to design reusable transformation frameworks and common utilities.




Experience building source to target reconciliation and data quality checks.

Data Storage & SQL
Excellent SQL skills including:
Complex joins
Subqueries and CTEs
Window functions
Query optimization

Experience working with:
RDBMS sources (Postgres, MySQL)
Data lake storage using Parquet / ORC

Experience with partitioned datasets and compaction strategies.

Cloud & Big Data Platforms
Hands on experience with at least one Spark platform:
AWS EMR
Spark on Kubernetes
Experience working with cloud storage:
S3
Familiarity with orchestration tools:

Airflow, Databricks Workflows, ADF, or equivalent.

Responsibilities

Pipeline Development & Ownership
Design, implement, and maintain high performance PySpark ETL pipelines.
Own pipelines end to end, including development, deployment, monitoring, and production support.
Ensure pipelines are scalable, fault tolerant, and re runnable.
Implement incremental processing and ecient data movement strategies.

Performance & Reliability
Identify and fix Spark performance bottlenecks.
Optimize resource usage and reduce execution time and cost.

Handle production issues related to:
Job failures
Data corruption
SLA breaches
Perform root cause analysis and implement permanent fixes.

Data Quality & Governance
Implement robust data quality validations, checks, and reconciliation
mechanisms.
Ensure correctness, completeness, and freshness of datasets.

Follow enterprise standards for:
Data retention
Auditability
Schema evolution

Engineering Excellence
Write clean, maintainable, and testable PySpark code.
Conduct code reviews and guide junior engineers.
Follow best practices for:
Version control (Git)
CI/CD
Logging and monitoring
Maintain clear documentation and operational runbooks.

📌 Senior PySpark ETL Lead Engineer (Chennai)
🏢 Relevantz Technology Services
📍 Chennai