About

I'm a simulation and XR engineer who builds real-time 3D systems where data, physics, and perception meet. At the University of Waterloo's CVISS Lab I develop XR systems that stream live ROS data into 3D environments for scientific and spatial visualization, with strict correctness and performance validation.

My background spans Unity and Unreal (C#), real-time sensor and heatmap visualization, hand- and gesture-tracking, computer vision, and ML pipelines — plus the full-stack and cloud work needed to ship these systems end to end. I'm focused on robotics simulation: digital twins, sim-to-real workflows, and the tooling that lets engineers see and trust what a robot perceives.

What I Work On

Robotics & ROS

Streaming real-time ROS data into 3D scenes, validating mapping consistency, and building visualization tooling for spatial data.

Simulation & Digital Twins

Physics-driven, multiplayer-synced 3D environments in Unity/Unreal with profiling and correctness validation at scale.

Perception & ML

Computer vision, sensor fusion, heatmaps, and ML pipelines (hand pose, EEG, image processing) feeding interactive systems.

Projects

Video demos on each card. (Replace the demo links with your YouTube URLs — search the HTML for YOUTUBE_URL.)

Watch demo

ROS-Integrated XR Visualization

Unity-based XR system streaming real-time ROS data into 3D scenes for scientific and spatial visualization. Validated mapping consistency via integration testing; profiled CPU/GPU/memory on large scenes. (CVISS Lab, U. Waterloo)

ROS Unity XR Real-Time Data
Watch demo

Real-Time Sensor Twin (2000-Sensor Body Map)

ML + image-processing pipeline driving a real-time heatmap visualization of the human body across 2,000 sensors in Unity, integrated with a .NET backend over sockets. Validated correctness and edge cases. (XSENSOR, Medical Tech)

Unity ML Shaders .NET
Watch demo

Quest 3 Multiplayer VR Simulation

Multiplayer VR simulation on Quest 3 using Photon PUN and Meta SDK. Built interaction systems, physics-based object logic, gesture-driven 3D UI, and developer tooling. Debugged multiplayer desync/authority through systematic root-cause analysis. (BMad)

Unity Photon PUN Physics Multiplayer
Watch demo

EEG-Based Decision Prediction in VR

MSc research: an ML pipeline predicting human decisions in VR from EEG signals, plus VR memory-optimization techniques for Quest 2. Hand- and gesture-recognition built and validated in Unity.

EEG ML Unity Research
Watch demo

3D Inspection & Reporting System

Unity Android app for 3D report generation with a Google Cloud backend and an OpenCV+ML barcode scanner. Inspection tooling deployed for SAQ and IKEA warehouses; improved report-generation efficiency ~4×. (Optim Structure)

Unity OpenCV Android Cloud
Watch demo

GenAI Platform (Sibnik AI)

End-to-end AI platform — web, iOS, admin dashboards, chatbot, RAG. Scalable Cloudflare Workers backend for asset ingestion and multi-tenant APIs; embeddings and semantic search; shipped to the App Store with CI/CD.

RAG Cloudflare iOS APIs

Professional Experience

Nov 2025 - Present

Research Assistant — XR / Scientific Visualization

University of Waterloo, CVISS Lab — Waterloo, Canada

Developing Unity-based XR systems for scientific and spatial data visualization with strict correctness and performance validation. Integrating real-time ROS data streams into 3D environments and verifying mapping consistency via integration testing. Profiling CPU/GPU/memory on large-scale scenes and validating fixes.

ROS Unity XR Profiling
Nov 2023 - Present

Unity VR Developer

BMad Technology Inc. — Montreal, Canada

Developed and owned quality of a Quest 3 multiplayer VR simulation using Photon PUN, Meta SDK, Firebase, and MongoDB. Built interaction systems, developer tooling, and SDK-migration utilities. Debugged multiplayer desync, authority, and timing through systematic root-cause analysis. Maintained CI/CD (GitHub Actions) and optimized runtime performance with the Unity Profiler.

Unity Photon PUN Meta SDK CI/CD
2024 - Present

Full-Stack Developer — AI Platform

Sibnik AI — Montreal, Canada

Designed and delivered an AI-powered platform (web, iOS, admin dashboards, chatbot, RAG). Built a scalable Cloudflare Workers backend for asset ingestion, AI processing, and multi-tenant APIs. Implemented embeddings and semantic search; deployed to the App Store with test/production environments and automation for catalog management and analytics.

RAG Cloudflare iOS APIs
Feb 2023 - Sep 2023

3D Software Developer (Medical Tech)

XSENSOR Technology Corp. — Calgary, Canada

Built real-time ML-driven heatmap and sensor visualizations in Unity with correctness validation. Developed large-scale 3D visualization tools (2,000 sensors) and tested stability and edge cases. Integrated Unity systems with .NET applications and ran cross-boundary integration testing. Worked with inverse kinematics, HLSL shaders, and sockets.

Unity ML Shaders .NET
Jan 2025 - Mar 2025

AR Full-Stack Developer

Blizza Brands Inc. — Toronto, Canada

Developed AR experiences and validated tracking, animation, and cross-device behavior. Built a role-based asset-management platform (Next.js + Strapi) with regression-tested API/UI flows. Delivered 3D WebGL product showcases and managed TestFlight releases with defect reproduction and verification.

AR Three.js Next.js WebGL
Jul 2022 - Mar 2023

Unity Developer — Full Stack

Optim Structure Inc. — Montreal, Canada

Built Unity Android inspection and reporting apps with verified cloud-sync accuracy. Implemented ML-based barcode scanning and improved reliability via field testing. Built dashboards and WebGL tools with regression-tested API workflows; improved report-generation efficiency ~4×.

Unity OpenCV Vue.js Cloud
2021 - 2023

Research VR Developer (MSc)

Bishop's University — Sherbrooke, Canada

MSc research on VR memory optimization (Quest 2) and EEG-based ML pipelines for human decision prediction in VR. Implemented and validated hand- and gesture-recognition in Unity.

VR Research EEG ML Unity
Before 2021

Software & Research Developer

Multiple Organizations — Tehran, Iran

Backend, fintech, and real-time systems (Node.js, Python, Redis, MongoDB, RabbitMQ, WebSockets). Aerospace and image-processing research (CFD, OpenCV, ML, cross-correlation) with validated numerical outputs. Built Android, Electron, and Unity applications for visualization and lab tooling.

Python CFD OpenCV Real-Time

Skills & Technologies

Robotics & Simulation

ROS Real-Time Data Streams Digital Twins Physics Simulation Inverse Kinematics Sensor Visualization

3D / XR Engines

Unity (C#) Unreal Engine Meta Quest SDK Photon PUN HLSL Shaders WebGL / Three.js

AI & Computer Vision

PyTorch OpenCV Hand Pose / Gesture EEG ML RAG / Embeddings Image Processing

Engineering & Cloud

C# / Python / C++ CI/CD (GitHub Actions) Profiling & Optimization .NET Cloudflare / GCP Node.js

Publications

Brain Volume Predicts Skewed Locomotor Output and Lower Temporal Regularity

O. Demers, A. Yavari, S. Ghaffari, R. Nouri, M. Majidi, M. Bayatzadeh, S. Rezayani, R. Butler

Submitted, 2025

Motion Gesture Detection for AR/VR using ML

S. Rezayani, R. Butler

In Review, 2024

Education

2021 - 2023

MSc, Computer Science

Bishop's University — Sherbrooke, Canada

Thesis: Sculpting in VR with human hands and memory optimization in Unity (Quest 2).

Research: EEG-based human decision prediction in VR using ML pipelines.

2013 - 2021

BSc & MSc, Aerospace Engineering

AmirKabir University of Technology (Tehran Polytechnic) — Tehran, Iran

Focus: Image processing, CFD, computer vision, finite element methods, numerical methods.

Awards & Recognition

Epic Games Unreal Fellowship

Selected participant (North America), 2024

Epic Games

GameLab Technovation Jam

3rd Place, 2024

Technovation

AUT GameCraft

5th Place, 2024

AUT

Get in Touch

Open to robotics simulation, XR, and 3D engineering roles. The fastest way to reach me:

salarworking@gmail.com LinkedIn