Smart contracts, bots and Web3 tooling that ship.

SZ Solutions LLC is the development studio of Shahzain Tariq, a certified blockchain developer building on Ethereum and Solana since 2020. Smart contracts, DeFi integrations, trading bots and the backend that ties them together.

Discuss a project View GitHub

20+completed client projects

100%job success on Upwork

Top RatedUpwork status

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.26;

/// @notice Uniswap V4 hook with a
///         configurable swap fee
contract SwapFeeHook is BaseHook {
    uint24 public swapFee;

    function beforeSwap(
        address,
        PoolKey calldata,
        SwapParams calldata,
        bytes calldata
    ) external override onlyPoolManager
      returns (bytes4, BeforeSwapDelta, uint24)
    {
        return (this.beforeSwap.selector,
                ZERO_DELTA, swapFee | OVERRIDE_FEE_FLAG);
    }
}

What I build

Smart contract development

Custom Solidity contracts with full tests, from payment contracts to multi-token systems.

Uniswap and DeFi integrations

Uniswap V2, V3 and V4 integrations, including V4 hooks with custom swap fee logic.

Tokens and NFTs

ERC-20, ERC-721 and ERC-1155 contracts, generative NFT collections, minting and launch support.

Trading and automation bots

Arbitrage bots, on-chain monitoring and Telegram bots for alerts, trading and community tools.

Solana development

Solana programs, token tooling and bots, alongside Ethereum and other EVM chains.

Full-stack dApps

React and Next.js front ends wired to contracts with ethers.js or web3.js, plus Node.js backends.

Selected work

Trading automation

Prediction market arbitrage bot

An automated bot that tracks short-interval BTC prediction markets on Polymarket and executes arbitrage opportunities.

DeFi

Uniswap V4 hook with swap fee logic

A V4 hook implementing custom swap fees for a client's pools.

"He communicated with me properly and he knows what to do, great dev!"

Solana

Solana Telegram bot

A high-performance Telegram bot for Solana, built for speed and reliability under live trading conditions.

"Delivered a high performance and well structured bot exceeding expectations, great work!"

Smart contracts

ERC-1155 contracts and payment engine

Upgrade of an existing ERC-1155 system and the payment contract that settles purchases on-chain.

NFT

Generative NFT collection

Smart contract, testing and launch support for a generative NFT collection, plus the project website.

About

I've been building blockchain software professionally since 2020, first as a freelance Ethereum developer and then on Upwork, where I've completed more than 20 projects with a 100% job success score and Top Rated status.

My work spans Solidity smart contracts, DeFi integrations, NFT launches, trading bots and the full-stack apps around them, on both Ethereum and Solana. I'm a Certified Blockchain Developer (Ethereum) through the Blockchain Training Alliance.

In 2026 I formed SZ Solutions LLC to take on client work under a registered company. Projects are contracted and invoiced through the company, per project or on a monthly basis, always starting with a clear written scope.

Start a project

Email personal.shahzaintariq@gmail.com with a short description of what you're building and your timeline.

Code: github.com/shahzaintariq