Add Daryna Shevchuk 2026 fellow page

_fellows/2026/dasha-pn.md

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+---
+layout: fellow
+pagetype: fellow
+shortname: dasha-pn
+permalink: /fellows/dasha-pn.html
+fellow-name: Daryna Shevchuk
+title: Daryna Shevchuk - IRIS-HEP Fellow
+active: True
+dates:
+  start: 2026-06-08
+  end: 2026-08-30
+photo: /assets/images/team/fellows-2026/Daryna-Shevchuk.jpg
+institution: Ukrainian Catholic University
+e-mail: d.shevchuk.pn@ucu.edu.ua
+focus-area: as
+challenge-area:
+project_title: Benchmarking and Optimizing PyHS3
+project_goal: >
+  Develop a comprehensive benchmarking and optimization infrastructure for
+  PyHS3, a pure-Python implementation of the HEP Statistics Serialization
+  Standard (HS3). The project focuses on measuring runtime performance and
+  memory usage across representative High Energy Physics statistical
+  workloads, including probability density function evaluation, likelihood
+  calculation, parameter fitting, and model scaling. Benchmarking results
+  will be compared against established frameworks such as ROOT, pyhf, zfit,
+  and numba-stats to ensure both performance improvements and numerical
+  agreement. Using profiling-driven analysis, the project will identify
+  bottlenecks in graph construction, compilation, and model evaluation, and
+  implement optimizations such as caching and computational graph
+  simplifications. The resulting infrastructure will provide reproducible
+  benchmarks, continuous performance tracking, and documentation to support
+  future PyHS3 development.
+mentors:
+  - Giordon Stark (University of California, Santa Cruz)
+proposal: /assets/pdf/fellows-2026/UKR001-proposal-Daryna-Shevchuk.pdf
+presentations:
+current_status:
+github-username: dasha-pn
+linkedin-profile: https://www.linkedin.com/in/daryna-shevchuk-dsh/
+---