Senior Java Developer (Icon Solutions IPF/Payments) - 6-Month Contract - London Contracting role based in Reading (Hybrid, 2-3 days in office) for a 6-month engagement within the utilities sector. You will validate the quality, integrity, and accuracy of large-scale data processing solutions across cloud-based data platforms, working across ETL testing, data pipeline validation, and Spark-based environments in an Agile delivery team. Key Responsibilities: Design, develop, and execute test cases for data pipelines and ETL processes Validate data quality, integrity, transformation, and migration across systems and environments Develop and execute SQL and PySpark scripts to support data validation activities Perform testing of Spark and Databricks-based data solutions Identify, document, and track defects through to resolution, collaborating with data engineers, developers, and business stakeholders Participate in Agile ceremonies including sprint planning, reviews, and retrospectives Contribute to test automation initiatives and continuous improvement of testing processes What You Will Ideally Bring: Hands-on PySpark and Spark SQL experience - essential Strong SQL skills for data validation and analysis - essential Experience working on cloud platforms - Azure preferred; AWS or GCP also considered Experience with Databricks or other Spark-based platforms - essential Strong understanding of data validation, ETL testing, and data quality methodologies 3-5 years of overall QA/T