Senior Staff Software Engineer – Query Execution
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Job Description
Senior Staff Engineer building Dremio’s query execution engine for its unified lakehouse platform. Optimizing Java/JVM runtime performance, scalability, and reliability for analytical queries.
Responsibilities:
- Design, implement, test, and support query operators, expression evaluation, execution scheduling, runtime planning, and resource management
- Optimize vectorized processing, concurrency, parallelism, memory usage, data exchange, and disk spilling
- Investigate query correctness and performance issues using query profiles, profiling tools, telemetry, benchmarks, logs, and production data
- Improve Java and JVM runtime characteristics, including CPU utilization, allocation behavior, garbage collection, and thread behavior
- Collaborate with Query Planner, Datalake, Product, Support, and field engineering teams on end-to-end query improvements
- Apply AI-assisted development tools to code comprehension, debugging, test generation, documentation, and incident analysis
- Validate AI-generated code and recommendations through review, testing, benchmarking, and engineering judgment
- Participate in design and code reviews, contribute to technical direction, and mentor other engineers
Requirements:
- 5+ years developing production software, preferably in database systems, query execution, distributed systems, or related areas
- Strong Java skills; experience with C++ is a plus
- Strong foundation in data structures, algorithms, concurrency, multithreaded programming, and asynchronous programming
- Understanding of database internals, query processing, distributed execution, and performance optimization
- Experience profiling and optimizing CPU, memory, garbage collection, thread behavior, or other runtime characteristics
- Ability to solve ambiguous technical problems and work effectively across team boundaries
- Ability to evaluate tradeoffs, validate solutions rigorously, and make sound decisions when working with unfamiliar or AI-assisted implementations
- Strong communication skills, a sense of ownership, and a commitment to delivering high-quality software
- Bonus: experience with distributed query engines, database engines, or large-scale data processing systems
- Bonus: experience with vectorized execution, query operators, expression evaluation, code generation, or runtime optimization
- Bonus: experience with JVM profiling, memory management, caching, networking, data exchange, execution scheduling, or disk spilling
- Bonus: experience with Apache Arrow, Apache Iceberg, Parquet, Avro, Spark, Hadoop, or cloud object stores
- Bonus: contributing to open-source projects
Benefits:
- Equal opportunity employer supporting workforce diversity
- Necessary accommodations for individuals with disabilities within the application and interview process
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