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 robust 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.

Robust 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 strong 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