Zia Ul Rehman User

Leading transition from legacy monolith to cloud-native microservices, architecting multi-account disaster recovery with 1-minute RPO and 6-hour RTO. Designed zero-trust authorization engine using OPA, AWS Verified Permissions, Rego, and Cedar, scaling multi-tenant platform from 500 to 3,000 tenants.

Architected multi-tenant SSO broker supporting OIDC and SAML 2.0 for enterprise search platform. Built SCIM integrations for user lifecycle management and led design of fine-grained RBAC/ABAC permission system in Ruby on Rails.

Built LTI integrations connecting AI assistant application to Canvas LMS backend via LTI 1.3 and LTI Advantage, and trained internal team on integration pattern.

Owned architecture, infrastructure, and scalability across multiple SaaS products, building and leading engineering teams. Led Redux-to-RTK migration and React 15-to-18 upgrade, delivering up to 100x improvement in Core Web Vitals and 3x reduction in production build size.

Owned technical direction for multiple products, driving major stack upgrades across Rails 4 to 7, React 15 to 18, and Postgres 9.4 to 15. Built and formalized 4-8 week technical training programs as Learning & Development lead, and supervised engineering teams.

Moved across three roles on the same product line: started as Ruby on Rails backend engineer, transitioned to Python backend building Apache Airflow pipelines with Django REST and RabbitMQ, then moved into frontend-focused role on core Marketplace codebase. Drove test coverage and code-quality improvements using Jest.

Served on core platform team as full-stack engineer focused on backend, Shopify API integrations, and client onboarding, maintaining and enhancing Rails admin panel. Supported production stability and monitoring, and helped decouple monolith into microservices.

Owned technical direction for multiple products, driving major stack upgrades across Rails 4 to 7, React 15 to 18, and Postgres 9.4 to 15. Built and formalized 4-8 week technical training programs as Learning & Development lead, and supervised engineering teams.

Built Shopify admin plugins from the ground up using Ruby on Rails and React, integrating Shopify Polaris and App Bridge.

Built cross-LMS course-sharing plugins for a non-profit education platform using LTI 1.1 and LTI 1.3, incorporating TSUGI and PHP for shareable learning-tool compatibility.

Owned Shopify plugin development end to end from build through DevOps, and delivered major stack upgrades across the runtime. Converted UI designs into responsive, atomic-design React components, hardening frontend against XSS and CSRF while implementing RBAC and SSO; built cross-platform video calling with WebRTC.

Rescued failing Sidekiq background job environment on Qdr, reducing job runtime from 8 hours to under 20 minutes and stabilizing memory usage from 8GB to under 2.5GB; executed multi-hundred-million-record data migrations and integrated EHR APIs including Epic and Athenahealth.

Rescued failing Sidekiq background job environment on Qdr, reducing job runtime from 8 hours to under 20 minutes and stabilizing memory usage from 8GB to under 2.5GB; executed multi-hundred-million-record data migrations and integrated EHR APIs including Epic and Athenahealth.

Rescued failing Sidekiq background job environment on Qdr, reducing job runtime from 8 hours to under 20 minutes and stabilizing memory usage from 8GB to under 2.5GB; executed multi-hundred-million-record data migrations and integrated EHR APIs including Epic and Athenahealth.

Built a custom Java Swing desktop application, fully in Unicode Urdu, for wholesale shoe store inventory and income management, delivered iteratively on an agile model as client requirements evolved.

Bachelor of Science in Computer Science from Punjab University College of Information Technology, Lahore, completed in 2016.

Intermediate in Computer Science from Punjab College of Information Technology, Lahore, completed in 2012.