Smart contract development UK

Secure smart contracts for DeFi and digital assets

Carlton Digital Co. builds Solidity systems for lending platforms, decentralised exchanges, DAOs, stablecoins and tokenised assets. Every release is tested, reviewed and documented before it reaches a live network.

Security comes first.

Discuss your project Solidity, Rust and Vyper

5 delivery stages

3 contract languages

24/7 monitoring options

UK based delivery team

VaultController.sol reviewed

// deposits follow a tested accounting path
function deposit(uint256 amount)
    external
    whenNotPaused
    returns (uint256 shares)
{
    shares = previewDeposit(amount);
    _mint(msg.sender, shares);
    asset.safeTransferFrom(
        msg.sender,
        address(this),
        amount
    );
}

Fuzz tested Gas profiled

Use cases

What we build

The contract design follows the product, the assets and the people who will operate it. Each system has a clear scope before code begins.

DeFi protocols

Build lending, borrowing and yield systems with interest calculations, collateral rules and emergency controls that are visible in the code.

Crypto lending contracts

DEX and AMM contracts

Create swap, liquidity and fee logic for decentralised exchanges, with careful attention to slippage, permissions and re-entrancy risk.

DEX contracts

DAO governance

Give token holders a defined route for proposals, voting, quorum checks and execution. Timelocks can create space for review before a change takes effect.

DAO governance contracts

Stablecoins and tokenised assets

Set supply, minting, redemption and role permissions for stablecoin infrastructure, membership tokens and assets represented on-chain.

Token development

How delivery works

Our smart contract development process

The work is split into decisions you can review. That keeps scope, risk and deployment timing visible.

01 / Define

Requirements and architecture

We map user roles, asset flows, failure states and network constraints. The result is a written contract plan.

02 / Build

Modular Solidity, Rust or Vyper development

Small modules keep permissions and accounting easier to inspect. Interfaces are prepared for the wider application.

03 / Test

Unit and integration testing

Tests cover expected behaviour, edge cases and hostile input. Forked network tests check interaction with live protocols.

04 / Refine

Gas optimisation

Storage layout, calldata choices and repeated operations are profiled so users pay for only the work the transaction needs.

05 / Release

Deployment and verification

We deploy with a controlled runbook, verify source code and hand over documentation for ongoing operations.

Security and testing

Built with security in mind

A passing build is only the start. We combine automated checks with senior review and a plan for what happens after launch.

Slither MythX Fuzzing Formal verification

Automated analysis

Static analysis flags common vulnerabilities before manual review.

Fuzz and invariant tests

Unexpected inputs are pushed through accounting and permission rules.

Senior code review

A second engineer checks the implementation against the agreed design.

Post-deployment monitoring

Alerts and response procedures help your team watch live contracts.

Architecture choices

Future-proof contract architecture

Upgrade decisions belong in the first architecture conversation. Some protocols need immutability. Others need a governed path for change.

UUPS and Transparent proxies

Select an upgrade pattern with explicit admin controls and a clear storage plan.

Diamond standard

Split large systems into facets when modular upgrades justify the added governance work.

Timelocks and multisig

Give operators a controlled process for sensitive changes and emergency actions.

Migration planning

Prepare data, balances and user communications before a contract version changes.

Clear documentation and post-launch support

The handover explains what the contracts do, how operators use them and which assumptions future engineers must preserve.

Plan your handover

Developer documentation

Interfaces, events, deployment variables and local testing instructions.

Token-holder guides

Plain explanations for approvals, staking, voting and redemption flows.

Ongoing maintenance

Planned upgrades, dependency checks and support for operational changes.

Support SLA options

Choose response coverage that matches your protocol's launch and operating hours.

Next step

Ready to build your smart contract?

Get a fixed-price quote and timeline for your DeFi protocol, token platform or digital asset system.

Request a consultation