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gihanrcg/README.md

Hi, I'm Gihan Siriwardhana 👋

Lead Full-Stack Product Engineer focused on Fintech, Payments, Wallets, and Stablecoins

PortfolioLinkedInX / TwitterStack OverflowFacebook


About Me

I build products at the intersection of fintech, payments, wallet infrastructure, and Web3.

Over the past 8+ years, I’ve worked across web, mobile, backend, and cloud systems to ship reliable products in high-growth environments. My recent work has focused on:

  • stablecoin-based financial products
  • non-custodial wallet infrastructure
  • virtual cards and virtual accounts
  • payment integrations and checkout systems
  • developer-facing fintech platforms
  • scalable full-stack product architecture

I enjoy turning complex infrastructure into products that feel simple, trustworthy, and easy to use.


What I’m Working On

  • Building and scaling fintech and wallet-based products
  • Exploring deeper work in stablecoins, cards, and financial infrastructure
  • Growing as a senior technical leader across product and engineering
  • Continuing to sharpen my skills in modern TypeScript, React, React Native, Node.js, and cloud systems

Experience Snapshot

Maash

Worked on a stablecoin-based neo-banking platform built around a non-custodial wallet across mobile and web.

  • Led the frontend buildout from 0
  • Owned Android, iOS, and business platform development
  • Shipped Visa and Mastercard virtual cards
  • Delivered USD, EUR, and AED virtual account experiences
  • Built payment checkout widgets and partner integration flows

Onramper

Core member of a small engineering team that built and scaled a crypto on-ramp aggregation platform.

  • Helped integrate 30+ on-ramp providers
  • Built backend systems for routing and partner integrations
  • Worked on high-availability product infrastructure
  • Supported major wallet and exchange integrations
  • Helped scale the company through acquisition by MoonPay

Earlier Work

  • Built scalable enterprise commerce systems at Sysco
  • Worked on developer tooling and platform engineering at IFS R&D
  • Led and contributed across frontend, backend, cloud, APIs, product delivery, and developer experience

Tech I Work With

Frontend

React React Native Next.js TypeScript JavaScript Tailwind CSS

Backend

Node.js NestJS GraphQL REST API Java Spring

Cloud, Data, and Infra

AWS AWS Lambda PostgreSQL MongoDB DynamoDB Docker Kubernetes

Fintech and Web3

Solana Ethereum WalletConnect Rust


Highlights

  • Built and launched fintech products across wallet, card, and virtual banking experiences
  • Helped scale Onramper through a key growth stage leading to acquisition by MoonPay
  • Contributed to a platform supporting 1,000+ cryptocurrencies, 130 fiat currencies, and 120+ payment methods
  • Reduced transaction fees and improved success rates through integration and routing improvements
  • Built a VS Code extension with 15,000+ downloads
  • First and only Microsoft Learn Student Ambassador Gold Level in Sri Lanka

GitHub Stats


Let’s Connect

I’m always happy to connect around:

  • fintech and payment infrastructure
  • wallet products and stablecoins
  • full-stack product engineering
  • developer tools
  • startup product building

Portfolio LinkedIn X

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