Shajinder Singh Padda

Sr. Developer Analyst

• Architected and implemented highly scalable product modules within a Ruby/Postgres backend monolith.
• Migrated legacy REST API to GraphQL for the support administration portal.
• Optimized low-performing search queries (Postgres, Redis, Opensearch, Sequel ORM) to significantly reduce query memory load and execution time.
• Scaled back-end operations to handle direct, high-volume data integration with partner vendors. (Ruby, Sidekiq, Redis)
• Worked within a team to upgrade our eligibility handling microservices, scaling from handling 5,000 transactions in minutes to a concurrent batch processing system capable of handling 1M+. (NodeJS, TypeScript, Redis, BullMQ)
• Architected a high-volume Event-Driven data synchronization pipeline using Solace and Ruby, enabling real-time authentication consistency across systems.
• Worked directly with our support teams to migrate legacy clients to new optimized flows, writing custom utility scripts and triaging issues in production. (Ruby, Jenkins, Datadog)
• Implemented backend authentication logic for vendor side integration to internal systems (JWT, Ruby)
• Integrated AI tools and custom agent scripts into the development pipeline to assist with routine tasks and improve workflow efficiency.
• Ensured systems architecture and data integration pipelines maintained strict compliance with Canadian PIPEDA/PHIPA privacy regulations regarding electronic health records.
• Performed and participated in peer code reviews (Ruby, React, TypeScript, Postgres)

Sr. Web & Mobile Developer & Architect

• Led migration of a legacy proprietary CMS from Rails 3 to a Rails 5 API backend, implementing a secure REST API and a modern VueJS/HTML5 front end.
• Maintained and scaled mission-critical internal billing software for a Top-3 Canadian telecommunications provider, ensuring high availability and secure transaction handling.
• Developed, maintained and deployed shopping centre directory board mapping apps to various malls across North America. (ElectronJS, C#)
• Engineered a custom Dijkstra-based wayfinding algorithm for directory boards, delivering real-time, highly accurate routing for high-traffic shopping centres across North America.
• Implemented Kubernetes cloud cluster and provisioned servers for scalable app deployment and maintenance.
• Used AWS cloud solutions to maintain backup and deployment scripts for various projects. (EC2, S3 and RDS)
• Maintained and deployed Android and IOS apps. (Java, Android, Objective C)
• Communicated directly with stakeholders and assisted the project management team with SOW agreements.

Sr. Web & Mobile Developer

• Architected proprietary ERP systems and e-commerce solutions integrated with major marketplaces (Amazon, eBay), couriers, and payment gateways.
• Developed custom middleware, REST SDKs, and CMS plugins to bridge public platforms, legacy databases, and EDI/SOAP/JSON APIs.
• Managed system stability by automating CI/CD pipelines, deploying cloud backup solutions, and conducting security patch audits.
• Led mobile game development for iOS/Android, built custom Jira plugins, and consulted stakeholders on project scoping.

Early Career & Consulting

• Developed MVPs for early startups in Rails and built custom e-commerce sites using WordPress and Shopify.
• Designed secure internal networks (VPN/LAN), document management systems, and managed hardware procurement.
• Executed mission-critical data migrations, server setups, and system recovery for small business clients.

Bachelor of Arts in Computer Science

Accelerated Continuing Education program with an emphasis on: OOP Programming and Theory, Advanced Algorithm Design, Computer System Design and Workflows, Networking and Systems Management, Relational Database Design and architecture.

Diploma Computer Programming

Practical training and education in: Object-Oriented Design, Java, C++, C#, PHP, Perl, Oracle DB Administration and Maintenance, Linux and Unix Systems, System Design, Software Workflow and methodologies.