Index | Resume

William (Bill) Hamilton

Contact

beiller@gmail.com
647.389.1872
https://www.linkedin.com/in/bill-hamilton-42b53325/
https://beiller.github.io/resume.html
Menlo Park, California

PROFESSIONAL SUMMARY

• Experienced engineering manager with an extensive career in software development moving on to lead highly technical teams and deliver complex software solutions
• Proven ability to drive cross-functional collaboration, optimize processes that reduce costs, and ensure the timely delivery of projects
• Skilled in fostering a culture of innovation, mentoring engineers, and aligning technical initiatives with business objectives
• Track record of improved performance and increased reliability through an observability first methodology
• A passion for all things software and in the loop on each week's new state-of-the-art

ARCHITECTURE & INFRASTRUCTURE

• Serverless architecture with AWS Lambda and Azure Functions
• Event-driven architecture with Apache Kafka, RabbitMQ, and Amazon SQS
• REST-based APIs using Node.js, Python, and Java
• Microservice orchestration with Docker, Kubernetes, and Terraform
• Stack management using CloudFormation and Serveless Framework
• Observability using Sumo, Datadog
• Amazon IaaS (AWS, EC2, Elastic Beanstalk)
• Google Cloud IaaS (GCP, Compute Engine, Cloud Storage)
• Azure PaaS/IaaS (Azure App Service, Azure Storage)

EXPERIENCE

Meta

Engineering Manager, Meta Account Access

July 2025 - Present

• Leading a large-scale legacy auth refactor unifying backend challenge flows across Facebook, Instagram, WhatsApp, Threads. Reduced new app authentication onboarding time from months to 1 week.
• Lead a team of 10 engineers owning authentication and session management for all major Meta apps serving billions of DAUs
• Led cross-org testing initiative targeting +20% critical test coverage, eliminating flaky tests, and introducing push-blocking gates enabling safer and faster AI-assisted code changes at scale
• Drove AI tooling adoption across the team, accelerating development velocity and integration of AI-assisted workflows
• Bench building, promoted an IC5 → IC6 (Staff SWE) a highly selective bar at Meta. Structured mentorship and ownership of high-visibility projects
• Execute high-performance team building through Meta hiring pipeline, hiring and onboarding senior engineers with focus on technical excellence and cultural fit
• Provide performance coaching to struggling engineers, successfully bringing low-performers back on track

Laydelmi

Co-Founder

March 2020 - July 2025

• Conceived, designed, and launched a grassroots video streaming app focused on cooking content and local creator communities
• Built and shipped the MVP from scratch, leading all phases from product ideation to technical implementation
• Assembled and managed a small team of designers and PMs across design and development
• Gained hands-on experience in early-stage product development, team building, and go-to-market strategy

Shopify / Flexport

Optimization Engineering (Dev Manager)

Nov 2022 - Oct 2024

• Managed growing team from 5 to 10 engineers across optimization, but with a main focus on order management maintaining 99.9% uptime on mission-critical shipping APIs processing 10k-100k orders/day
• Led team through Shopify Logistics acquisition by Flexport, ensuring seamless transition and continued delivery
• Successfully led a major cross-org inbounding algorithm update resulting in 20% annual fulfillment cost savings and significant "split shipment" reduction
• Reduced order processing latency by 30% by balancing predictions and modeling accuracy with real-world effects on API latency
• Consolidated team rituals and process creep increasing project delivery speed by 30% and reducing deployment defects
• Designed support rotation decreasing critical ticket volume by 50% using dashboard-based proactive issue resolution
• Large sunsetting initiatives, deleting legacy code reducing technical debt and increased development velocity by 30%

Operations Research (Sr. Software Engineer)

Apr 2022 - Nov 2022

• Developed network simulation software for comparing warehouse placement algorithms and estimating implementation timelines
• Collaborated with data science teams on ML-driven inventory management systems and billing features generating +15% ARR
• Developed carbon emissions 3d interactive presentation modeling and 3d animated presentation org-wide on the ship time, cost, and emissions trade-offs leveraging huge historic data sets and advances simulation

Uplift

Tech Lead

Sept 2019 - Nov 2022

• Responsible for various microservices APIs and serverless backends on the credit / lending team
• Perform management duties such as interviews and performance reviews as well as leadership of small engineering team of 3 and hands on coding 50/50 split
• Responsible for all things related to underwriting backend services, deploying and maintaining machine learning models trained by data science teams used to underwrite loans
• Develop faster validation and backtesting pipelines for model implementation and unified feature generation to speed up deployments of new models
• Unified many critical credit APIs with zero downtime and zero bug launches through the extensive use of test driven development (TDD) for critical APIs

Liquor Control Board of Ontario (LCBO)

Senior Application Developer

March 2017 - Sept 2019

Development team lead at the world's largest alcohol retailer coordinating cloud APIs with beautiful customer focused interfaces, mentoring internal, external, on-shore and off-shore development teams

• Performing code reviews, mentoring developer teams, approval of source code changes based on pull request workflows
• Leading e-commerce backend and frontend development team of 4 using Java/JSP and Javascript
• Leading University of Waterloo co-op teams of 4 using React, Angular, and Ionic with node js backends and TypeScript to build lightweight B2B applications
• Lead engineer for LCBO public APIs to query Inventory, B2C Order Placement and B2B Integrations with autoscaling back-ends requiring sub-second response times
• Launched cutting edge projects like Foodora courier delivery (B2B Integrations)
• Architect and implement cloud based continuous integration pipelines including automated security scans, unit tests, and smoke tests using selenium scripts running in Docker containers
• Continuous Deploy of applications to cloud PaaS providers such as Microsoft Azure, Google Cloud Platform, and Amazon Web Services
• Integration of cloud technologies with legacy infrastructure (Migration to git, Containerization)

Senior Programmer Analyst

March 2011 - March 2017 (6 years 1 month)

• LCBO Mobile App Sole Developer (2016 Android / IOS)
• Java, J2EE development
• SQL Mastery in Oracle PL/SQL, Teradata, DB2, Postgres, MySQL
• Informatica, Sales forecasting, Demand chain and supply chain applications, chemical lab software and equipment support
• Mentoring team members
• Mobile B2B applications for tracking products and inventory management

CityDirect dot info

Senior Application Developer

September 2007 - March 2011 (3 years 7 months)

• Cloud based telephony systems, advanced CRM data engineering to enable marketing teams
• MySQL and Postgres Distributed Data Architecture (replication, clustering)
• Lead Application Developer using PHP and Python
• Networks (advanced routing and load balancing)
• Web crawling, CRM applications, user interface design and optimization, application development and life cycles
• Writing great documentation

EDUCATION

• Certificate in Project Management, University of Toronto, Toronto Ontario Canada
• Honours Bachelor of Computer Science, Laurentian University, Sudbury Ontario Canada

ADDITIONAL PROJECTS

Godot game engine

https://github.com/godotengine/godot (Contributor) Bugfix and dual quaternion implementation

llama.cpp - Facebook Large Language Model in C++ (Mar 2023 - Apr 2023)

https://github.com/ggerganov/llama.cpp (Contributor) Added repeat penalty feature. Repo became official part of Meta Llama 3 download package. https://github.com/ggerganov/llama.cpp/pull/20

Laydelmi app for Android/IOS - Video Streaming Platform for Cooking

Check out the app on Android/IOS app store!

Older Projects

• Containerizing PyTorch machine learning facial reconstruction application https://github.com/beiller/3DDFA
• Ammo.js - A WASM compiled port of Bullet physics library to Javascript contributor https://github.com/beiller/ammo.js
• C++ port of liquibooks to Python, an order matching engine https://github.com/beiller/python-liquibook
• Sparechange dot io alternative monetization platform