Big Data Developer

Responsibilities:

• Design, develop, and maintain large-scale data processing pipelines using Big Data technologies (e.g., Hadoop, Spark, Python, Scala).
• Implement data ingestion, storage, transformation, and analysis of solutions that are scalable, efficient, and reliable.
• Stay current with industry trends and emerging Big Data technologies to continuously improve the data architecture
• Collaborate with cross-functional teams to understand business requirements and translate them into technical solutions.
• Optimize and enhance existing data pipelines for performance, scalability, and reliability.
• Develop automated testing frameworks and implement continuous testing for data quality assurance.
• Conduct unit, integration, and system testing to ensure the robustness and accuracy of data pipelines.
• Work with data scientists and analysts to support data-driven decision-making across the organization.
• Ability to write and maintain automated unit, integration, and end-to-end tests
• Monitor and troubleshoot data pipelines in production environments to identify and resolve issues.

Education/Experience Requirements:

• Bachelor's degree in Computer Science, Information Systems or related discipline with at least five (5) years of related experience, or equivalent training and/or work experience; Master's degree and past Financial Services industry experience preferred.
• Demonstrated technical expertise in Object Oriented and database technologies/concepts which resulted in deployment of enterprise quality solutions.
• Past experience with developing enterprise quality solutions in an iterative or Agile environment.
• Extensive knowledge of industry leading software engineering approaches including Test Automation, Build Automation and Configuration Management frameworks.
• Strong written and verbal technical communication skills.
• Demonstrated ability to develop effective working relationships that improved the quality of work products.
• Should be well organized, thorough, and able to handle competing priorities.
• Ability to maintain focus and develop proficiency in new skills rapidly.
• Ability to work in a fast paced environment.
• Experience with object oriented programming languages such as Java, Scala or Python.

Essential Technical Skills:

• AI Tool Proficiency: Hands-on experience with AI development tools (GitHub Copilot, Q Developer, ChatGPT, Claude, etc.)
• Technical Background: Strong software development background with ability to contribute to technical discussions
• Agile Methodology: Extensive experience with Scrum, Kanban, and continuous improvement practices

Big Data technologies

• Experience with Big data technologies such as Hadoop, Spark, Hive & Trino
• Evaluate understanding of common issues like:

o Data skew and strategies to mitigate it.

o Working with massive data volumes in PetaBytes.

o Troublehsooting job failures due to resource limitations, bad data, scalability challenged.

• Look for real-world debugging and mitigation stories.

AI Skills

• Prompt Engineering: Proficiency in crafting effective prompts for AI coding assistants and analysis tools
• AI Workflow Design: Experience redesigning development processes to leverage AI capabilities
• Data Analysis: Ability to interpret AI-generated insights and translate them into actionable team improvements
• Change Management: Experience leading teams through AI adoption and workflow transformation

SQL Skills (Window Functions, Joins, Complex Queries)

• Assess comfort with SQL window functions, multi-table joins, aggregations.
• Provide examples or ask them to write/optimize SQL queries on the spot.
• Probe how they handle edge cases like NULLs, duplicates, ordering, etc.

Apache Spark (Development, Internals & Tuning)

• Test their understanding of Spark s core architecture executors, tasks, stages, DAG.
• Focus on Spark performance tuning techniques: partitioning, caching, broadcast joins, etc.
• Ask scenario-based questions on troubleshooting slow running/stuck jobs or resource issues in Spark.
• Explore their experience optimizing Spark jobs for large-scale datasets.

Cloud Technologies

• Check exposure to AWS services like S3, EMR, Glue, Lambda, Athena, etc.
• Ask how they ve used S3 with Spark (e.g., dealing with file formats, consistency issues).
• EKS, Serverless knowledge, etc

Programming - Python or Scala

• Assess ability to write clean, modular, and performant code.
• Look for experience in functional programming concepts (e.g., immutability, higher-order functions).
• Ask about real-world use cases where they wrote scalable data processing code.
• Evaluate understanding of collections, concurrency, and memory management.

Good to have:

• Experience with managing production data pipelines/ETL systems
• Experience with CI/CD
• Experience writing test cases
• AWS certifications