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isaadabbasi/README.md
Saad Abbasi — Senior Software Engineer, specializing in financial infrastructure, payments and trading systems

LinkedIn  Repositories  Karachi, Pakistan

01. About

I’m a senior software engineer with 10+ years of experience building across full-stack products, backend systems, cloud infrastructure, and Web3.

That breadth now supports a more deliberate direction: I’m specializing in financial infrastructure, payments, trading systems, and how money moves—combining hands-on payment exposure with the engineering judgment developed across a decade of product work.

My Web3 work has included token-gated social products, smart contracts, blockchain indexers, NFT platforms, a swap, a perpetual DEX, and Shōyu—Sushi’s creator-focused NFT marketplace.

10+ years  →  software engineering across product, data and infrastructure
~5 years   →  Web3 products, smart contracts, indexers and trading systems
now        →  deeper work in payments, ledgers and reliable money movement

02. Current direction

💳 Financial systems

Transaction lifecycles, payment state machines, idempotency, ledgers, reconciliation, database correctness, retries and failure handling.

⚡ Trading & Web3

On-chain/off-chain data flows, smart contracts, indexers, NFT infrastructure, swaps, perpetual markets and decentralized applications.

☁️ Systems & cloud

Backend architecture, PostgreSQL, event-driven workflows, containers, CI/CD, infrastructure as code, AWS and GCP.

🧭 Learning in public

Turning research and practical learning into code, technical writing, open-source examples and engineering sessions.

03. Selected public work

Foundry-based implementations covering an algorithmic stablecoin, a verifiable raffle and staking experiments.

Solidity Foundry DeFi

An experimental token-gated learning model with refundable deposits and NFT completion certificates.

Solidity NFTs Token Gating

Browser-side log queues using Web Workers, batching, retries, payload validation and dead-letter handling.

JavaScript Web Workers Queues

A compact testing ground for comparing Node.js API frameworks and JavaScript runtimes.

Node.js Bun Performance

A small TypeScript backend experiment using Bun, Hono, Drizzle ORM and PostgreSQL.

TypeScript Hono PostgreSQL

A command-line text-search utility created while exploring systems programming with Rust.

Rust CLI Systems

These repositories include educational and experimental work. My larger product contributions have primarily lived in private or employer-owned codebases.

04. Engineering toolkit

TypeScript, React, Next.js, Angular, Node.js, NestJS, PostgreSQL, Redis, GraphQL, Solidity, Rust, AWS, GCP, Docker and GitHub Actions

Layer Working set
Product & frontend TypeScript, React, Next.js, Angular, state management, design systems, data-heavy interfaces
Backend & data Node.js, NestJS, Fastify, GraphQL, PostgreSQL, Redis, TypeORM, event-driven systems
Web3 Solidity, Foundry, Hardhat, indexers, smart contracts, on-chain/off-chain integrations
Cloud & delivery AWS, GCP, Docker, serverless systems, Pulumi, NGINX, GitHub Actions

05. Writing: financial systems for engineers

I’m writing a practical book for software engineers who want to understand payments and financial infrastructure from first principles.

The work connects accounting foundations, payment flows, database correctness, distributed-systems patterns, and real-world failure modes. It is part of my own specialization journey: rigorous, practical, and shared in public—not presented as a claim of complete mastery.

payment intent → authorization → state transition → ledger → settlement → reconciliation

06. Beyond the code

I’m also exploring practical AI-assisted engineering, research, architecture, and learning—using AI to improve leverage while keeping human judgment, verification, and responsibility at the center.

I plan to share more through technical writing, open-source work, sessions, and public appearances.


Building across the stack. Going deeper where software meets money.

Let’s connect on LinkedIn →

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  1. ts-node-apollo ts-node-apollo Public

    Boilerplate to get started with Typescript, ApolloGraphql, Nodejs and Postgres.

    TypeScript

  2. go-crud go-crud Public

    Getting hands dirty with Golang by making a simple CRUD application using gorilla/mux router.

    Go

  3. loqu loqu Public

    Loqu makes it simple to generate and send frontend logs using webworkers.

    JavaScript 11 2

  4. fund-me fund-me Public

    A basic public fund-me smart-contract written in solidity using foundry tools.

    Solidity

  5. rust-grep rust-grep Public

    grep like basic cli-app built on rustlang

    Rust

  6. smart-contracts-solidity smart-contracts-solidity Public

    Smart Contracts written in solidity using foundry, contains Lottery, StableCoin, StakingReward, etc.

    Solidity