Smeet Shah

Experience

Three co-ops across developer APIs, commerce, and on-chain settlement. I also build and maintain software with nonprofit teams.

Résumé

  1. May 2026 — August 2026

    Toronto, ON

    Mantle

    Software Engineering Intern

    Mantle builds software for finance teams. I led the delivery of its first customer-facing, read-only API suite.

    • Owned the API key platform end-to-end, from data modelling and issuance to validation and management across every customer-facing endpoint.
    • Designed role-based access control across the API surface and introduced layered rate limiting with AWS WAF.
    • Built multi-system export support by changing how external IDs are stored across entities, securities, investments, and holdings; delivered eight portfolio-management and CRM integrations.

    Outcome8 production portfolio-management and CRM integrations

    Watch my multi-system export demoA public walkthrough on Mantle’s LinkedIn of the feature I helped build.
    • Go
    • TypeScript
    • REST APIs
    • API keys
    • RBAC
    • AWS WAF

    Details of Mantle’s internal systems, clients, and architecture are confidential and intentionally left out.

  2. September 2025 — December 2025

    Toronto, ON

    Shopify

    Software Engineering Intern

    Shopify Admin is the dashboard millions of merchants use to run their stores. On the Admin Foundations team I helped keep it fast and modern.

    • Migrated legacy components to modern React and Polaris UI patterns, and refactored backend endpoints in Ruby on Rails.
    • Led development of improved discount-allocation logic across checkout and refund flows, reducing discount-related errors by 7% and increasing checkout conversion by 23%.
    • Contributed to accessibility and internationalization work so the Admin holds up across locales and assistive technologies.

    Outcome23% increase in checkout conversion from discount-allocation work

    • React
    • Polaris
    • Ruby on Rails
    • TypeScript
    • GraphQL
    • a11y / i18n

  3. January 2025 — December 2025

    Toronto, ON

    WageX

    Software Engineering Intern

    WageX is a sports-prediction platform that settles real-money events on-chain. I built the Web3 systems that make that settlement trustworthy.

    • Led development of responsive, interactive React components in TypeScript and Tailwind across the platform’s interfaces.
    • Built scalable backend APIs with Next.js and integrated Solidity smart contracts on Sepolia to manage USDC-based escrows — connecting frontend, backend, and chain.
    • Designed and deployed a custom off-chain oracle with an automated event-settlement pipeline that processed 1,000+ real sports events.

    Outcome40% lower gas costs via signed-message settlement

    • React
    • TypeScript
    • Next.js
    • Solidity
    • Ethers.js
    • Hardhat

Community work

Useful software also means keeping things working for the people who rely on them.

UW Blueprint

Developer

Backend features for the Oakville & Milton Humane Society: database seeding, authentication, and tools that help volunteers coordinate pet care.

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Blueprint Software Foundation

Member

Maintaining nonprofit projects after handoff and helping turn one-off builds into free, reusable tools for other organizations.

More about the work

Jain Society of Toronto

Web developer & maintainer

Ongoing website maintenance, clearer program and event information, donation-flow improvements, and digital tools for the community.

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For the projects behind the work, browse my projects.