Before You Build a Web3 Product: 3 Things to Get Right

Putting something on-chain doesn’t make it a better product. It makes it a different kind of product, with different strengths, different costs and a very different failure mode. Teams that do well in Web3 tend to treat the blockchain the way a good engineer treats any powerful dependency: used deliberately, for the parts where nothing else will do.

If you’re planning to build a Web3 product, whether that’s a DeFi protocol, a marketplace, a game or a tool that touches tokens, these are the three decisions that shape everything that follows.

1. Problem first. Blockchain second.

Start from the user’s problem, not the technology. A blockchain is a specific tool with a specific trade-off: it lets many parties share state and rules without trusting a single operator, and in exchange every write costs money, takes time, is public by default and is hard to undo.

That trade-off is worth it when your product needs at least one of these:

• Decentralised control. No single company, including yours, should be able to change the rules or the balances on its own: settlement between parties who don’t trust each other, custody rules, governance.
• Transparent verification. Anyone should be able to check the state and its history without asking you: token issuance, reserves, provenance, the outcome of a draw.
• Programmable assets. Users should genuinely own something they can hold, transfer or use in other applications without your permission.

If none of these apply, a conventional database is usually faster, cheaper, more private and easier to change. That isn’t a failure of ambition; most of a well-built Web3 product is ordinary software anyway: accounts, search, notifications, analytics, content and admin tools all live off-chain.

Questions to ask before you write a contract

1. Who needs to trust whom, and what happens if the operator (you) disappears or behaves badly?
2. Does anyone need to verify this data independently, without relying on your servers?
3. Should users be able to take their assets elsewhere?
4. Which actions must be on-chain, and which can be computed, stored or cached off-chain?
5. What does each on-chain action cost the user, and is that cost acceptable at your expected volume?

The answers usually lead to a hybrid design: a small, carefully designed on-chain core surrounded by conventional infrastructure. We go deeper into that split in On-chain vs off-chain: what actually belongs on the blockchain.

2. Security is foundational, not a launch task

Smart contracts are unusual software. They often hold real value, their code is public, anyone in the world can call them, and once deployed they are hard to change. Upgradeable proxy patterns exist, but they add their own complexity and trust assumptions. That combination means security can’t be a box ticked the week before launch. It has to shape the design.

In practice, “security from day one” looks like this:

• Threat-model early. Write down what the contracts protect, who the actors are (users, admins, other contracts, oracles), which roles are privileged and what an attacker would try first.
• Keep the on-chain surface small. Less code means fewer paths to get wrong. Prefer well-reviewed libraries over custom implementations of standard patterns.
• Test every path, including the failure paths: unit tests, fuzzing and invariant tests that check the properties your system must never violate.
• Get the code reviewed by engineers who didn’t write it, and run static analysis as part of the workflow.
• Use an independent audit where meaningful value is at stake, and leave time to fix what it finds.
• Plan for incidents. Monitoring, alerting, clearly controlled admin keys and a response plan matter after launch as much as tests do before it.

An audit lowers risk. It doesn’t remove it.

Audits are a valuable second opinion on a fixed snapshot of code, but they’re time-boxed, scoped and done by people. Treat the audit as one layer in a process, not a certificate. Our smart contract security checklist walks through each layer in order.

3. Complex technology. Simple experience.

The most common reason people abandon Web3 products isn’t the idea; it’s the friction. Every unfamiliar prompt is a moment where a user can get confused, scared or lost. Your users shouldn’t need to understand gas, seed phrases or chain IDs to use what you built, any more than they need to understand TCP to send an email.

Clear wallet flows

Decide early how people will get in. Browser wallets and WalletConnect suit crypto-native users; embedded wallets and smart contract accounts can let newcomers start with an email or passkey and add self-custody later. Account abstraction (ERC-4337) also makes patterns like sponsored gas possible, so a first action doesn’t require buying a token. Whatever you choose, never ask users to type a seed phrase into your app.

Honest transaction status

A transaction isn’t a button click; it moves through states. Show them: waiting for signature, submitted, confirming, confirmed or failed. Finality works differently from chain to chain, so be precise about what “done” means on yours. Never show success optimistically for something that can still fail.

Errors people can act on

“Execution reverted” tells a user nothing. “Not enough ETH for the network fee. Add a small amount to continue” tells them exactly what to do. Map common failures (insufficient balance, wrong network, rejected signature, slippage) to plain language and a next step. Where users must sign messages, use structured, human-readable signing (EIP-712) rather than opaque hex.

Early mistakes worth avoiding

A handful of mistakes come up again and again when teams set out to build a Web3 product. None of them are exotic, and all of them are cheaper to avoid than to fix.

Starting with a token

A token is a tool for coordinating ownership and incentives, not a product in itself. Designing tokenomics before you know what users will do with the product tends to produce incentives that attract speculation rather than usage. Work out the core loop first: what does a user come back to do? Then decide whether a token makes that loop better.

Putting everything on-chain “for transparency”

Transparency is valuable where people need to verify something. Applied indiscriminately, it makes every interaction slow and expensive and exposes data that should be private. Be specific about what users need to verify, and anchor or publish exactly that.

Treating the audit as the security plan

When the audit is scheduled for the end of the project, findings arrive when the architecture is fixed and the deadline is close. Fixes get rushed and re-review gets skipped. Security work spread across the build costs less and catches more.

Designing for crypto natives only

If your early users are all experienced with wallets, friction can hide in plain sight. They’ll tolerate network switches, raw hex signatures and cryptic errors that will stop everyone else. Test with newcomers early, even if they aren’t your launch audience.

Choosing a chain by hype

Networks differ in fees, finality, tooling, ecosystem and where your users already hold assets. Pick based on those requirements, and keep the option to expand later by separating chain-specific code from the rest of the product.

Putting it together

These three principles reinforce each other. A smaller on-chain core is easier to secure. A secure, well-scoped core is easier to wrap in a simple interface. And a product that solves a real problem gives users a reason to push through whatever friction remains. Get them right before the first contract is written, and most of the expensive mistakes never happen.

Building something in this space? See how we approach Web3 and blockchain development, browse our case studies, or talk to us about your project.