Smart Contract Development for real funds needs engineering you can audit, not code you hope is correct.
Most smart contract bugs aren't novel. They're access control mistakes, re-entrancy vulnerabilities, and untested edge cases that a proper development process catches before deployment. We write Solidity that auditors can review, users can trust, and engineers can maintain.
Sound familiar?
Your dev team can write Solidity but the contract hasn't been tested against re-entrancy, integer overflow, or access control exploits.
You need a smart contract auditor but your code isn't audit-ready — missing natspec, no test suite, and the logic is hard to follow.
You launched a contract with a bug that cost real funds. Now you need it rebuilt properly.
You have a product idea but no blockchain engineers — and you need production-grade contracts, not a tutorial clone.
What this means
Smart contract development is not writing Solidity. It's designing systems that can't be broken.
A smart contract is immutable once deployed to mainnet. Every edge case, every permission, every inter-contract dependency needs to be correct before deployment — because there's no hotfix on the blockchain.
The majority of DeFi exploits aren't zero-day vulnerabilities. They're logic errors that a proper test suite would have caught, access control mistakes that a code review would have flagged, and re-entrancy bugs that are well-understood and preventable.
Nextelligentia treats smart contract development as safety-critical software engineering. Architecture before code. Tests before deployment. Audit before mainnet. Always.
This page is the blockchain development authority — Solidity on Ethereum and other EVM chains, plus the Web3 application layer those contracts sit under. Tokenized real-world assets are covered on RWA Tokenization Development. Settlement rails are covered on Stablecoin Payment Infrastructure. Lending and liquidity protocols are covered on DeFi Protocol Engineering. Multi-chain work is covered on Cross-Chain Integration. Hardening existing contracts is covered on Smart Contract Security Hardening.
Shipped blockchain work includes Hemergy, a tokenized renewable energy investment platform, and EX Sports, a Web3 gaming and NFT marketplace. Explore the Hemergy case study. Explore the EX Sports case study. Supporting writing: how to choose a blockchain development company and smart contract security guide.
0
post-audit critical vulnerabilities on our contracts
100%
test coverage before any audit or deployment
Mainnet-ready
Solidity from the first commit, not the last
Services
What's included in every smart contract build
Architecture, development, testing, security review, and deployment — one team, no hand-offs.
Solidity Smart Contract Architecture
We design contract systems before writing a single function — inheritance structure, access control patterns, upgrade strategy, gas optimisation approach, and inter-contract dependency mapping.
Included on all projects
ERC Standard Implementation
ERC-20, ERC-721, ERC-1155, ERC-4626, ERC-2981, and custom standards — implemented correctly with full compliance to the specification, not copy-pasted from a tutorial.
Included on all projects
Access Control & Role Management
OpenZeppelin AccessControl, Ownable, multi-sig integrations, and time-lock governance — so the right addresses can do the right things, and nothing else.
Included on all projects
Comprehensive Test Suite
Unit tests, integration tests, fuzz testing, and invariant tests using Foundry and Hardhat. Your auditor gets a codebase with 100% coverage on critical paths, not a bare repo.
Included on all projects
Gas Optimisation
Storage packing, calldata optimisation, loop gas analysis, and EVM opcode-level review — so your contracts are economical to interact with at scale.
Included on all projects
Audit Coordination & Deployment
We produce audit-ready code with full natspec documentation and coordinate with your chosen auditor. After audit, we handle remediation and manage mainnet deployment.
Included on all projects
Our work
Related case studies
How it works
Architecture first. Tests before deploy. Audit before mainnet.
Every phase has a defined deliverable and your sign-off. Smart contracts don't get hotfixed after deployment — getting the process right the first time is not optional.
Requirements & Architecture Design
We map every function, permission, state change, and external dependency before writing code. Architecture decisions made wrong at this stage cause the most expensive bugs.
Solidity Development
Clean, well-commented Solidity following established patterns — not clever code that confuses auditors and creates attack surface.
Testing — Unit, Integration & Fuzz
Comprehensive test suite covering expected behaviour, edge cases, and adversarial scenarios. We don't hand over a contract we wouldn't stake our own funds on.
Internal Security Review
Re-entrancy, access control, arithmetic issues, oracle manipulation, and front-running analysis — reviewed before the external auditor touches it.
Audit, Remediation & Deployment
We coordinate with your auditor, fix findings, re-test, and manage a staged mainnet deployment with monitoring in place from go-live.
Fit check
We work with some blockchain projects.
Not all of them.
We're probably right for you if…
- You need production-grade Solidity — not a tutorial clone, not a fork with minimal changes.
- You're preparing for a smart contract audit and need a codebase an auditor can work with.
- You've had a contract exploited and need a rebuild done correctly this time.
- You have a DeFi, NFT, RWA, or token project that requires custom contract logic.
- You want a fixed scope and price before development starts.
We're probably not the right fit if…
- You want a simple ERC-20 or NFT contract — we're not the right team for commodity contracts.
- You want to skip the audit on a contract that handles real user funds — that's not something we'll recommend.
- You need something deployed in under 3 weeks. Proper smart contract development takes 6–14 weeks.
- You want to keep changing requirements mid-development — contract architecture changes are expensive.
Tech stack
The tooling your smart contracts are built and tested with
Languages
Frameworks
Testing
Networks
Tooling
Common questions
Everything you need to know about smart contract development
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Ready to build smart contracts your auditor signs off on the first time?
Audit-ready Solidity. Full test coverage. Deployed to mainnet only when it's ready.