Alexander Ocsa

Staff Software Engineer

• Designed physical execution abstractions with spill paths across GPU HBM → RAM → Disk, enabling stable execution of memory-intensive queries.
• Shaped a distributed count-distinct algorithm that delivered ~5× speedup vs. prior approach at cluster scale.
• Championed best practices for code-splitting strategies introducing leak-spotting structures tuned to join types; improved reliability and tail latencies.
• Enhanced the Apache Arrow codebase by contributing to both C++ and Python, while developing clear, comprehensive documentation to streamline onboarding and support future contributors.
• Proposed and implemented core architectural improvements to the Theseus engine, contributing to scalability and performance enhancements.

Senior C++ Software Engineer

• Shipped advanced numerical and deep-learning features in PyTorch, focusing on high-performance kernels and correctness at scale.
• Implemented new functionality and optimizations in C++/CUDA/Python, improving throughput and reliability across core components used by a large global user base.
• Built GPU-accelerated sparse-tensor kernels and infrastructure enabling efficient processing of large sparse datasets and removing critical bottlenecks.
• Optimized low-level ATen operators and execution paths, eliminating inefficient memory/compute patterns and improving overall performance characteristics.
• Collaborated in public issues/PRs with maintainers and users to land changes with strong tests and documentation.

Senior Software Engineer

• Designed the original execution model combining three async executors—compute (libcuDF), comms (UCX/TCP), and memory/spill (host/disk)—to improve backpressure handling, utilization, and resilience under memory pressure.
• Built a UCX-based multipart GPU messaging layer, increasing network throughput and reducing CPU overhead for distributed queries.
• Led the physical plan + cache layers of a pull-based execution engine, enabling efficient processing of memory-intensive queries and higher sustained throughput.
• Detected pre-GA defects ~30% by overhauling unit/integration tests and CI signal, reducing first-release stability and user experience.
• Profiled end-to-end system trade-offs (I/O, messaging, kernel concurrency) and tuned policies/parameters to unlock better multi-node scalability.

Software Engineer & Bootcamp Teacher

• Led a teaching and instructional role as a Bootcamp teacher, guiding and developing talent through comprehensive e-learning platforms and hands-on training.
• Focused on building skills growth and career readiness in aspiring software developers.
• Led the development of talento.laboratoria.la, a networking platform that connected over 300 companies with bootcamp graduates, contributing to 1,000+ successful employment matches. Played a key role in both front-end and back-end development to ensure a seamless user experience and effective platform functionality.

Software Engineer

• Contributed to the development of cutting-edge mobile and game technologies, focusing on Holographic Mixed Reality Apps for the Microsoft HoloLens.
• Successfully launched these applications on both the iOS and Android platforms, enhancing user experiences through immersive and innovative technology solutions.

Universidad Nacional de San Agustin

Public congratulations for PhD thesis (Summa cum laude)

Sao Paulo University

Honors: Maximum Distinction

Universidad Nacional de San Agustin

Ranked 1st position in Engineering (class 2004-2009)