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Alex Lehner

Computer Engineer focuing on Software Development

I’m a Master’s student in Computer Engineering specializing in software engineering, machine learning, and data analytics.

I enjoy build scalable systems and optimizing algorithms to improve performance, automate workflows, and translate complex requirements to drive real-world impact.

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Experience

Engineered a Python/OpenCV color-tracking algorithm, increasing accuracy from 30% to 80% through hue calibration, contour grading, saturation-based filtering, and advanced image processing techniques
Built a full testing pipeline with training and validation datasets, transforming a black-box algorithm into a transparent, tunable system for rapid debugging and performance optimization
Developed and enhanced gameplay features in C# and Unity, including dynamic high-score detection to improve player engagement

Delivered $6M in annual savings for an automotive client by building VBA- and Power BI-based workload prediction tools
Led initiatives to streamline data access across 20+ global teams, generating $1.2M in annual efficiency gains
Resolved production bottlenecks to unlock a 21% capacity increase at a high-volume poultry plant
Applied data analysis and rapid prototyping of Python scheduling tools, client-facing React apps, and Power BI dashboards to drive $20M+ in savings through optimized labor, materials, and scheduling

Designed a pruning algorithm in C++ that reduced runtime from 15 hours to 12 minutes (98% performance improvement)
Built diagnostic software to trace CP-SAT constraint solver failures, eliminating 100% of the backlog
Optimized a Dijkstra-based algorithm for target selection, improving result quality by 10%
Took ownership of a critical stage in the software stack, resolving all bugs using C++ and Python to ensure long-term system stability

Developed the MVP of a full-stack marketplace using React, Node, Gatsby, and Sharetribe
Improved landing-page performance by 35% through Lighthouse-guided optimizations
Integrated Stripe and Chargebee APIs to enable initial product launch

Implemented NoSQL data pipelines using MongoDB, Facebook Leads, and Pipedrive
Designed responsive HTML/CSS email templates, increasing response rates by 15%

Built React and SQL-backed web applications for six small businesses, supporting their transition to online retail during COVID-19

Education

University of Toronto

Relevant Coursework

Introduction to Cloud Computing
Performant Software Systems with Rust
Foundations of Data Analytics and Machine Learning
Applied Deep Learning
Introduction to Data Science and Analytics

Relevant Coursework

Software Design and Communication
Introduction to Control Systems
Fundamentals of Artificial Intelligence
Computer Security
Algorithms and Data Structures
Computer Organization
Operating Systems
Computer Networks I
Introduction to Machine Learning

Projects

Featured Projects

Timetable Generator

GitHub →

A web-based scheduling application that generates conflict-free academic timetables based on user-defined courses and prioritized constraints. I designed and implemented the core scheduling algorithm, including constraint handling and pruning strategies to efficiently produce and rank valid timetables, and contributed to the frontend for multi-semester visualization and PDF exports. The project was awarded top 3 for ECE capstones.

C++PythonReactSQLFlask

GIS Mapping Application

GitHub →

A C++-based GPS mapping application built with GTK, designed specifically for senior users and awarded 1st place for innovative design. I implemented advanced graph-based routing algorithms, including a travelling-salesman-variant solver using meta-heuristic and simulated annealing–based iterative improvement, achieving 5th place out of 50+ teams for algorithmic performance.

C++GTK

Multi-Room and User Chat Room

Live Demo →GitHub →

A terminal-based, multi-user chat application built in Rust featuring asynchronous concurrency, real-time messaging via WebSockets, persistent chat history, and a polished CLI user experience with contextual help and command parsing.

RustTokioWebSocketsHTTPPostgreSQL

Student Volunteer Hours Manager

Live Demo →GitHub →

A cloud-native platform designed to replace paper-based volunteer hour tracking in Ontario high schools. The system supports role-based access for students, guidance counsellors, and administrators, automates approval workflows, and provides real-time visibility into student progress. Received a 100% for this project.

ReactNode.jsPostgreSQLDockerHTTPSSendGridDigitalOcean