Which networks and technologies do you develop on?

I mainly work on Ethereum and EVM-compatible networks (Polygon, Arbitrum, Optimism, Base, etc.). I develop smart contracts in Solidity and dApps with ethers.js, wagmi and viem.

Do you develop smart contracts from scratch?

Yes. I design and develop custom contracts in Solidity, or start from proven standards (OpenZeppelin) when it makes sense. I include tests with Hardhat or Foundry before any deployment.

Do you audit contract security?

I review security following best practices and secure patterns, and run thorough tests. For high-stakes projects, I also recommend and coordinate a specialized external audit.

Can you optimize the gas of my contracts?

Yes. I optimize gas consumption in the design and implementation of contracts to reduce deployment and per-transaction costs, without compromising security.

Do you integrate the smart contract with the frontend?

Yes. I connect contracts with the dApp: wallet connection, signing and sending transactions, on-chain state handling and a polished UX so the user understands what's happening at each step.

Do you create tokens, NFTs or DeFi integrations?

Yes. I develop tokens (ERC-20), NFT collections (ERC-721 / ERC-1155) with minting, and build integrations with existing DeFi protocols based on the project's needs.

How long does a Web3 project take?

It depends on the scope. A simple contract with its dApp can be ready in a few weeks; a protocol with several contracts and integrations takes longer. After reviewing your case I give you a realistic estimate.

Do you offer support and maintenance after deployment?

Yes. The code is delivered documented and verified on the block explorer, and we can agree on a support, monitoring and improvement plan so the project evolves securely.

I take your Web3 idea to mainnet with contracts that survive review

Web3 and blockchain development

7+ years building products in crypto: Solidity smart contracts, dApps with good UX and secure architectures on EVM.

I want to build my dApp

Solid, secure and production-ready Web3

In crypto the code is the product, and a bug cannot be patched quietly on Monday. That is why I work with tests before every deployment, known patterns instead of clever inventions, and contracts someone else can audit later. What I build ends up verified on the explorer and documented in your name.

Smart contracts and tokens

Solidity contracts on Ethereum and EVM networks
ERC-20, ERC-721 and ERC-1155 standards
Token creation and tokenomics design
Tests and coverage with Hardhat or Foundry

dApps and Web3 frontend

Wallet connection with ethers, wagmi and viem
UX for signing and tracking on-chain transactions
On-chain data indexing and reading
NFT collections with their minting process

Security and going live

Contract review and secure patterns
Gas optimization in design and implementation
Testnet and mainnet deployment, with verification
Integrations with existing DeFi protocols

Why build your Web3 project with me?

Security first, because in crypto mistakes are public and permanent

No crypto hype, no promising the moon with a token. I approach every project with a focus on security, gas cost and maintainability, with tests and reviews before any mainnet deployment. The result is reliable dApps and a foundation your project can grow on.

Contracts that pass the audit
Secure patterns, proven standards and thorough testing before mainnet. The projects I have worked on passed their audits with no critical findings.
Gas optimized from the design stage
Every transaction a user signs costs money. I optimize consumption in design and implementation, without trading away security to save a few wei.
Code someone can audit tomorrow
Readable, documented contracts, verified on the block explorer. If another team takes over, they understand what is there without archaeology.
The dApp, not just the contract
I connect contracts to the frontend and take care of the transaction UX, which is exactly where most users drop off.
Real experience in the space
I have built for DeFi protocols, launchpads, NFT collections and crypto education platforms. I know the mistakes that keep repeating.
The project is yours
Repository, contracts and deployments under your company name. No odd dependencies and no keys left in my drawer.

What I build in Web3

These are the projects I get asked for most. If your case looks like one of them, I have built it before.

DeFi protocol

Staking, lending or farming contracts, with the math reviewed and a dashboard so users understand what they are signing.

NFT collection with minting

ERC-721 or ERC-1155, allowlist, phased reveal and a minting site that holds up on launch day.

Token and tokenomics

ERC-20 design, allocation, vesting and locks, plus a verified deployment and documentation for the first holders.

Wallet in an existing product

Adding wallet connection, signing and on-chain payments to a web app that already works, without rebuilding it.

On-chain data dashboard

Reading and indexing what happens on chain and showing it in a dashboard that loads fast, instead of hitting the node on every visit.

Review of inherited contracts

Auditing and documenting contracts another team wrote, with a risk report and a prioritized fix plan.

Tell me about your Web3 project

How I go from your idea to a contract deployed on mainnet

I work out what the chain has to do

And what it does not. Half of what people put in a contract lives better off chain, where gas is free and mistakes can be fixed.

I design the contract and the model

States, permissions, roles and edge cases written down before any Solidity, because a deployed contract cannot be edited.

I build it with tests and review

Coverage with Hardhat or Foundry, tests for the paths nobody expects and a security review before touching a real network.

I deploy and stay around

Testnet first, then mainnet, with the code verified on the explorer and the first transactions monitored.

Got a Web3 idea and no clue where the contract should start?

Tell me about it

Crypto projects I have worked with

Testimonials

What the Web3 projects I have worked with say

Real protocols, collections and dApps. Here are some of the people who trusted me with their Web3.

★★★★★

"We needed to launch fast and with a top-tier site. Miguelo built the landing and then the full DeFi, blazing fast and pixel perfect, even with a redesign in between."

Xavi Recio

CEO · Avem Finance

★★★★★

"We needed fast internal tools with Web3, and Miguelo built them in a couple of weeks. He left us a component base we keep building on faster."

Josep Bove

CTO · AAVE Chan

★★★★★

"What kept me up at night was surviving the traffic spike Iniesta would bring. The platform didn't go down for a second, and minting and payments ran without a single incident."

Arnau Ramió

COO · Unic Legacy

Tell me about your Web3 project

Common questions

Frequently asked questions about Web3 and blockchain development

What I get asked almost every time before starting a crypto project.

Which networks and technologies do you develop on?
I mainly work on Ethereum and EVM-compatible networks (Polygon, Arbitrum, Optimism, Base, etc.). I develop smart contracts in Solidity and dApps with ethers.js, wagmi and viem.
Do you develop smart contracts from scratch?
Yes. I design and develop custom contracts in Solidity, or start from proven standards (OpenZeppelin) when it makes sense. I include tests with Hardhat or Foundry before any deployment.
Do you audit contract security?
I review security following best practices and secure patterns, and run thorough tests. For high-stakes projects, I also recommend and coordinate a specialized external audit.
Can you optimize the gas of my contracts?
Yes. I optimize gas consumption in the design and implementation of contracts to reduce deployment and per-transaction costs, without compromising security.
Do you integrate the smart contract with the frontend?
Yes. I connect contracts with the dApp: wallet connection, signing and sending transactions, on-chain state handling and a polished UX so the user understands what's happening at each step.
Do you create tokens, NFTs or DeFi integrations?
Yes. I develop tokens (ERC-20), NFT collections (ERC-721 / ERC-1155) with minting, and build integrations with existing DeFi protocols based on the project's needs.
How long does a Web3 project take?
It depends on the scope. A simple contract with its dApp can be ready in a few weeks; a protocol with several contracts and integrations takes longer. After reviewing your case I give you a realistic estimate.
Do you offer support and maintenance after deployment?
Yes. The code is delivered documented and verified on the block explorer, and we can agree on a support, monitoring and improvement plan so the project evolves securely.