I'm a software engineer with 3+ years of experience building scalable web applications, identity systems, developer platforms, and commerce infrastructure.

I work across the stack with React, TypeScript, Java, Spring Boot, Rust, Go, Node.js, and cloud-native tooling. My recent work has focused on custom Keycloak authentication flows, WebAuthn/passkeys, Shopify Functions using Rust/WASM, high-performance React interfaces, and event-driven backend systems.

I enjoy building systems that are not only functional, but also reliable, maintainable, and production-ready.

• Building discount engines and checkout automation systems for Shopify merchants
• Exploring Rust/WASM for high-performance commerce and platform logic
• Building ReAuth, a self-hosted identity provider with OAuth/OIDC, PKCE, WebAuthn, RBAC, and multi-realm support
• Learning deeper systems engineering, authentication protocols, and platform architecture

• Identity and Access Management
• OAuth 2.0 / OIDC / PKCE
• WebAuthn and Passkeys
• Keycloak SPI Development
• Rust and WebAssembly
• Scalable Backend Systems
• React Performance Optimization
• Developer Tools and Platform Engineering

• Built an event-driven discount reconciliation system to manage discount code lifecycle events across internal systems and Shopify.
• Designed automated checkout discount-code creation for Shopify funnels, reducing manual merchant setup.
• Re-architected discount computation logic from a reserve-based workflow to an impact-driven optimization algorithm.
• Built a Rust/WASM-based volume discount and free gift allocation engine for Shopify Functions, covering 80+ edge cases and reducing discount miscalculation incidents.

• Built custom Keycloak SPI modules and authenticators for advanced authentication flows.
• Implemented WebAuthn/passkey authentication with custom registration, challenge generation, and login endpoints.
• Automated Keycloak build and deployment workflows with CI/CD pipelines.
• Delivered custom Keycloak themes using FreeMarker templates, React-driven UI components, and Figma-aligned designs.
• Engineered a virtualized React table capable of rendering over 1 million cells for large dataset analysis.

• Built a 3D product configurator using React Three Fiber.
• Developed an e-commerce platform and admin dashboards using the MERN stack.
• Integrated Shiprocket and PhonePe APIs for logistics and payments.
• Designed dynamic product attribute management using tree and stack-based data structures.

A self-hosted identity provider built with Rust, TypeScript, Tokio, React, and Tailwind CSS.

Features include:

• OAuth 2.0 / OIDC with PKCE
• Multi-realm tenant isolation
• Visual authentication flow builder
• RBAC with custom permissions
• WebAuthn/passkey support
• React SDK
• SQLite-based embedded deployment
• Single binary distribution

• Email: lucifer.gupta2001@gmail.com
• LinkedIn: linkedin.com/in/nama-sagar-gupta-53626718b
• GitHub: github.com/sagargupta2001