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Feiyang0303/README.md

πŸ‘‹ Hi, I'm Feiyang Xu

Typing SVG

πŸš€ About Me

  • Computer Science student at the University of Waterloo focused on full-stack engineering, DevOps, and machine learning systems.

Experience

DevOps Engineering Intern (May 2026 - Present)
Xello Inc. - Toronto, ON

  • Engineered Node.js organization-level GitHub webhook integrations to automate CI/CD pipeline triggers, accelerating staging delivery for an enterprise SaaS platform utilized by over 9 million active students and educators.
  • Communicated directly with cross-functional development and QA teams to troubleshoot complex backend regressions, improving dev-stage environment stability and streamlining the production release lifecycle.

Software Developer Intern (Part-Time) (May 2026 - Present)
Utility Automation Solutions - Remote

  • Engineered robust fault-window detection algorithms in C# utilizing full-cycle DFT phasor magnitudes, adaptive baseline statistics, and aggregate rise logic to effectively analyze highly noisy grid recordings.

Undergraduate Research Assistant (ML Engineering) (Feb 2026 - Present)
University of Waterloo (Supervisor: Prof. Justin Wan) - Waterloo, ON

  • Conducting ML engineering research on diffusion model watermark robustness and model-forensics reliability under real-world perturbation conditions.
  • Built reusable Python/PyTorch experimentation infrastructure and standardized evaluation protocols to improve reproducibility across iterative research cycles.
  • Collaborate with faculty supervision and research collaborators to design experiments, interpret outcomes, and prioritize follow-up investigations.
  • Author technical reports summarizing empirical metrics, identified watermarking vulnerabilities, and proposed mitigation directions for future study.

Projects

Diffusion Watermarking | Python, PyTorch, NumPy, Computer Vision

  • Engineered a scalable evaluation framework to benchmark the cryptographic resilience of generative diffusion watermarks under destructive image compression and adversarial perturbation attacks.
  • Built optimized Fourier-domain computer vision pipelines to isolate latent spatial artifacts, improving Tree-Ring watermark detection rates by over 30%.
  • Implemented modular latent diffusion abstractions with zero-shot DDIM inversion to extract semantic latents without costly model fine-tuning.
  • Synthesized experiment telemetry into structured technical reports documenting evaluation metrics, structural weaknesses, and algorithmic mitigation proposals.

CapySpend | React, TypeScript, Node.js, PostgreSQL, Plaid API, OpenAI

  • Engineered a robust financial data ingestion pipeline integrating the Plaid API with an Express backend, implementing secure webhook listeners to synchronize real-time banking telemetry and handle idempotent transaction updates.
  • Architected an optimized PostgreSQL relational schema enforcing strict ACID compliance across user ledgers, writing complex SQL window functions and time-series aggregations to power sub-second cash-flow dashboards.
  • Designed an agentic LLM co-pilot utilizing OpenAI's structured tool-calling API and strict system prompts to autonomously parse unstructured natural language into deterministic, structured JSON categorization schemas.
  • Built a highly responsive React/TypeScript single-page application (SPA), deploying custom routing guards and secure HttpOnly cookie-based JWT authentication layers to rigorously mitigate XSS vulnerabilities.

AudioNovel | Python, Flask, MongoDB Atlas, Cohere, ElevenLabs

  • Built a scalable Flask REST API documented via OpenAPI specifications, integrating a companion React front-end utilizing secure cryptographically salted bcrypt user authentications.
  • Leveraged Cohere embed-english-v3.0 models to index contextual dense vector embeddings inside MongoDB Atlas, backing an optimized k-NN semantic search API endpoint.
  • Designed a 10-stage asynchronous background queue processing architecture to ingest text uploads and synthesize multi-character narration files via ElevenLabs TTS API integrations.

Awards & Honors

University of Waterloo Mathematics Global Scholarship (Sep 2025)

  • Awarded the Faculty of Mathematics' most prestigious global merit scholarship, granted to a select group of incoming undergraduate students demonstrating exceptional competition outcomes, extracurricular achievements, and academic excellence.

Euclid Mathematics Contest - Honorable Mention (Apr 2024)

  • Ranked top 10 nationwide in Canada among tens of thousands of competitors, demonstrating advanced problem-solving and mathematical proficiency.

πŸ› οΈ Tech Stack & Tools

Languages

Python Java C++ C C# Racket TypeScript JavaScript HTML5 CSS3 SQL

Frameworks & Database

React React Native Next.js Angular Expo Node.js Git MongoDB PostgreSQL

πŸ“Š Top Languages

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