Mo Susie Yu, B.A.Sc., B.Sc.

Senior Backend Software Engineer & Cloud Architect

Distributed Systems | Cloud Infrastructure | Security & Compliance

Toronto, ON, Canada

About

Senior Backend Software Engineer and GCP Certified Cloud Architect specializing in distributed systems, microservices design, and scalable, zero-trust infrastructure for high compliance environments. Proven track record of refactoring complex backend schemas, executing multi-tenant data migrations, optimizing cross database performance, and automating enterprise identity management. Bridges the gap between resilient backend application design and scalable, cloud native DevOps practices. Holds dual degrees in Computer Science (B.A.Sc.) and Life Sciences (B.Sc.) from McMaster University, with specialization in Psychology, Neuroscience and Behaviour.

Work Experience

  • Hypercare
  • Jul 2021 - Aug 2025
  • Backend Software Engineer
  • Full Time
  • Secure healthcare communication & coordination tool, MedTech.
    • ⋆ Architected secure, HIPAA-compliant backend microservices and established the foundational GraphQL structure following industry best practices, supporting 50k+ monthly active users and reducing physician response times.
    • ⋆ Migrated production multi-org data to a Single Tenant Account architecture with minimal downtime; refactored backend schemas and built custom scripts for data migration from MySQL to MongoDB.
    • ⋆ Integrated enterprise directory services (Active Directory, WorkOS, Auth0) to automate user lifecycle syncing and eliminate manual user provisioning overhead.
    • ⋆ Authored detailed public facing API documentation to streamline external integrations while exposing compliance safe data layers for hospital dashboards and analytics platforms.
    • ⋆ Established standardized testing practices and implemented Datadog and CloudWatch logging configurations to improve system observability.
    • ⋆ Guided interns to deliver a self managed paging feature, successfully minimizing recurring support ticket volume.
    • ⋆ Aided on-site deployments across Canadian and US hospital systems.
    • Technologies:
    • Node.js
    • GraphQL
    • MySQL
    • MongoDB
    • Docker
    • Kubernetes
    • Datadog
    • AWS (Lambda, EC2, ECS, S3, SNS, SQS, API Gateway, CloudWatch, IAM)
    • Github Actions
    • Twilio
    • Postman
    • WorkOS
  • RLDatix
  • Oct 2017 - Jun 2021
  • Backend Web Developer
  • Full Time
  • Healthcare governance, risk & compliance, MedTech.
    • ⋆ Engineered core backend web services and API modules for RLD HUB, an online engagement network for global healthcare compliance administrators.
    • ⋆ Modernized a legacy client engagement application to improve SQL query performance, secure data extraction endpoints, and implement robust web application security frameworks to mitigate vulnerabilities.
    • ⋆ Built an automated customer loyalty program integration, increasing active client participation in feedback loops and reference pipelines.
    • ⋆ Refactored and decoupled the platform's customer training and knowledge engine, lowering server load and reducing inbound customer support tickets.
    • Technologies:
    • C#
    • ASP.NET
    • Python
    • Django
    • PostgreSQL
    • Heroku Connect
    • JavaScript
    • HL7 FHIR
  • McMaster University
  • Sep 2016 - May 2017
  • Full Stack Engineer
  • Part Time
  • University administration web platform development.
    • ⋆ Developed a web based floor map and room allocation tracker for university administrators to manage on campus student housing in real time.
    • ⋆ Built live querying modules to give university staff real time visibility into student residence availability, reducing manual administrative work.
    • Technologies:
    • HTML
    • JavaScript
    • PHP
    • Symfony
    • CSS
  • Siemens Canada Limited
  • May 2014 - Sep 2014
  • Logistics Project Assistant, Healthcare - Imaging & IT
  • Co-op
  • Logistics and project support for the Canadian healthcare imaging and IT team.
    • ⋆ Designed and maintained data tracking models to reconcile budgeting metrics and streamline order processing workflows for medical imaging equipment.
    • ⋆ Analyzed and mapped internal project delivery workflows, standardizing documentation structures within SAP to improve cross functional resource accessibility.
    • Technologies:
    • SAP
    • Microsoft Excel
    • Data Analytics

Skills

    Software Architecture & Design
    • Microservices
    • Distributed Systems
    • Event Driven Architecture
    • Multi Tenant Isolation
    • Data Modeling
    • Database Migrations (SQL to NoSQL)
    • GraphQL
    • REST APIs
    • HL7 FHIR
    • Test Driven Development (TDD)
    Cloud & DevOps Infrastructure
    • AWS (Lambda, EC2, ECS, S3, SNS, SQS, API Gateway, CloudWatch, IAM)
    • Google Cloud Platform (GKE, Compute Engine, Cloud Run, Cloud Storage)
    • Cloudflare (DNS, Workers, Load Balancing)
    • Terraform
    • Docker
    • Kubernetes
    • CI/CD Pipelines (GitHub Actions)
    • Cloud Cost Optimization
    • Observability & Monitoring (Datadog, CloudWatch)
    Backend & Database Technologies
    • TypeScript / JavaScript
    • Python
    • C# (ASP.NET)
    • Node.js
    • Django
    • PostgreSQL
    • MongoDB
    • MySQL
    • RabbitMQ
    • Redis
    • Linux
    • Postman
    Security & Enterprise Integration
    • Zero Trust Access Control
    • HIPAA Compliant Infrastructure & Data Management
    • Credential Lifecycle Management
    • Secure API Design & Development
    • Enterprise Identity Management (Okta, Active Directory, OAuth, Auth0, WorkOS)

Education

  • McMaster University
  • Class of 2017
  • Bachelor of Applied Science (B.A.Sc.)
  • Honours Computer Science
    • Focus on Distributed Systems & Human-Computer Interaction.
    • Selected Research & Design:
    • • Capstone (ClinicFlow): Developed a patient and staff flow simulation model in partnership with Joseph Brant Hospital using Python and relational data pipelines.
    • • Research Thesis (MacQuest): AR spatial navigation system based on empirical UX research and user psychology studies.
  • McMaster University
  • Class of 2015
  • Bachelor of Science (B.Sc.)
  • Honours Life Sciences
    • Minor in Psychology, Neuroscience & Behaviour

Projects

  • SickKids Milk and Cookies Truck Tracker App ↗
  • Live digital location tracker built for a SickKids Hospital fundraising campaign.
    • ⋆ Built the backend architecture and real time GPS tracking engine to facilitate active live donor engagement and real time location streaming.
    • Technologies:
    • Java
    • Spring Framework
  • ClinicFlow
  • Engineering capstone project with Joseph Brant Hospital. System design and deployment of a patient flow simulation model.
    • ⋆ Designed and deployed a discrete event simulation engine that ingested historical hospital metrics to predict staff and patient flow rates.
    • ⋆ Engineered data ingestion pipelines in Python and PostgreSQL to parse operational datasets into real time visual metrics for hospital staff.
    • Technologies:
    • Python
    • PostgreSQL
    • JavaScript
    • Git
  • MacQuest ↗
  • Research study centered on AR interaction and user psychology to design an AR based campus navigation application to help university students navigate campus.
    • ⋆ Created UX deliverables, including user flows, wireframes, and page hierarchy, informed by research, testing, and analytics.
    • ⋆ Developed an intuitive and visually engaging interface for seamless navigation.
    • Technologies:
    • Java
    • Adobe Photoshop
    • Git
    • Technical Documentation
  • Letters Connect! ↗
  • Designed, illustrated, and developed a cross platform word puzzle game with three game modes and 80+ levels.
    • ⋆ Integrated ads and in app purchases on iOS and Android, generating revenue.
    • ⋆ Conducted A/B testing to optimize monetization strategies.
    • ⋆ Used analytics to improve user engagement and retention.
    • Technologies:
    • C#
    • Unity
    • MongoDB
    • Game Development
    • Game Design
    • Search Engine Optimization (SEO)
    • Adobe Photoshop
    • Git

Certifications

Volunteering