Senior PySpark Developer

The Applications Development Senior Programmer Analyst is an intermediate level position responsible for participation in the establishment and implementation of new or revised application systems and programs in coordination with the Technology team. The overall objective of this role is to contribute to applications systems analysis and programming activities.

Responsibilities: Conduct tasks related to feasibility studies, time and cost estimates, IT planning, risk technology, applications development, model development, and establish and implement new or revised applications systems and programs to meet specific business needs or user areas Monitor and control all phases of development process and analysis, design, construction, testing, and implementation as well as provide user and operational support on applications to business users Utilize in-depth specialty knowledge of applications development to analyze complex problems/issues, provide evaluation of business process, system process, and industry standards, and make evaluative judgement Recommend and develop security measures in post implementation analysis of business usage to ensure successful system design and functionality Consult with users/clients and other technology groups on issues, recommend advanced programming solutions, and install and assist customer exposure systems Ensure essential procedures are followed and help define operating standards and processes Serve as advisor or coach to new or lower level analysts Has the ability to operate with a limited level of direct supervision. Can exercise independence of judgement and autonomy. Acts as SME to senior stakeholders and /or other team members. Appropriately assess risk when business decisions are made, demonstrating particular consideration for the firm's reputation and safeguarding Citigroup, its clients and assets, by driving compliance with applicable laws, rules and regulations, adhering to Policy, applying sound ethical judgment regarding personal behavior, conduct and business practices, and escalating, managing and reporting control issues with transparency.

Qualifications: 5-8 years of relevant experience Experience in systems analysis and programming of software applications Experience in managing and implementing successful projects Working knowledge of consulting/project management techniques/methods Ability to work under pressure and manage deadlines or unexpected changes in expectations or requirements

Education: Bachelor’s degree/University degree or equivalent experience

This job description provides a high-level review of the types of work performed. Other job-related duties may be assigned as required.

In-depth understanding of HDFS architecture, data storage, and fault tolerance mechanisms. Experience with HDFS commands and administration.  Solid understanding of YARN resource management and job scheduling.  Fundamental understanding of MapReduce programming paradigm, even if primary development is in Spark/Flink. Knowledge of Zookeeper for distributed coordination services.  Strong proficiency in  Spark Core, Spark SQL, Spark Streaming, and Spark GraphX (beneficial) . Expert-level programming skills in  Python and Pyspark , specifically for developing Spark applications.   Experience with Spark performance optimization techniques (e.g., caching, partitioning, shuffle optimizations, memory management).  Experience with PySpark for data processing. Familiarity with data manipulation libraries (Pandas, NumPy). Scripting for automation and data orchestration.  Complex query writing, subqueries, window functions, and performance tuning. HBase (for real-time access to large datasets within Hadoop). Cassandra, MongoDB, or similar. Familiarity with RDBMS concepts and SQL for data integration.  Understanding of dimensional modeling, fact and dimension tables, star/snowflake schemas. 

Job Family Group: Technology

Job Family: Applications Development

Time Type: Full time

Most Relevant Skills Please see the requirements listed above.

Other Relevant Skills For complementary skills, please see above and/or contact the recruiter.

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