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

Backend Software & DevOps Engineer

Toronto, ON, Canada

About

Backend Software Engineer with expertise in distributed systems, microservices design, and secure, HIPAA compliant API architectures. Experienced in cross database migrations, multi-tenant system decoupling, and integrating zero trust identity management.

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, 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, 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
    • 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