Smart Contract Security matters when you're holding TVL on contracts that haven't been properly reviewed. That's not a risk. It's a countdown.
$3.8 billion was lost to smart contract exploits in 2023. 80% of DeFi exploits are architecturally preventable. We harden smart contract codebases — finding vulnerabilities, fixing them at the root cause, and bringing your contracts to a standard your auditor and your community can trust.
Sound familiar?
You're holding significant TVL on contracts that were deployed without a full audit — and you know it's a matter of time.
Your audit came back with critical findings but you don't have the in-house Solidity expertise to fix them correctly without introducing new bugs.
You want an audit but your codebase isn't audit-ready — no test suite, poor documentation, and architecture an auditor will struggle to reason about.
You launched fast and cut corners on security. Your protocol grew. Now you need to fix the foundation without taking it offline.
What this means
A smart contract audit without hardening is a report. A report without remediation is a liability document.
Most teams get an audit, receive findings, and then implement fixes with engineers who didn't write the original contract and don't fully understand the protocol's invariants. The fix closes the finding but opens new surface. The auditor re-reviews but misses the regression. This is how post-audit exploits happen.
Security hardening is the work between "we have code" and "we have a clean audit report" — finding vulnerabilities, understanding why they exist, fixing them correctly, and testing that the fix doesn't break invariants elsewhere.
Nextelligentia treats smart contract security hardening as engineering work, not a checkbox. Every finding is remediated at the root cause. Every fix is re-tested. Every audit coordination is hands-on.
This page is for hardening and audit-readiness of existing contracts. New Solidity and Ethereum development is covered on Smart Contract Development. New protocol design is covered on DeFi Protocol Engineering.
$3.8B+
lost to smart contract exploits in 2023 alone
80%
of DeFi exploits were architecturally preventable
Audit-ready
code delivered with full remediation support
Services
What's included in every security hardening engagement
Smart Contract Security Review
Manual line-by-line review of your Solidity codebase against the full DeFi attack taxonomy — re-entrancy, access control, arithmetic, oracle manipulation, flash loan vectors, MEV, and logic errors specific to your protocol's mechanism.
Included on all projects
Automated Vulnerability Scanning
Slither, Mythril, and Echidna static and dynamic analysis — run against your codebase and tuned to eliminate false positives so your team gets a clean signal, not a noisy report.
Included on all projects
Audit Readiness Preparation
If your codebase isn't ready for an external audit — missing natspec, no test suite, unclear architecture — we bring it to audit-ready standard before you engage an auditor. This reduces audit cost and time significantly.
Included on all projects
Vulnerability Remediation
We don't just find issues — we fix them. Every finding is remediated with a fix that addresses the root cause, not just the symptom, and re-tested to confirm the vulnerability is closed without introducing new surface.
Included on all projects
Security Test Suite Development
Invariant tests, fuzz tests, and adversarial scenario tests written specifically to catch the vulnerability classes relevant to your protocol — so future code changes are tested against your known risk surface.
Included on all projects
Audit Coordination & Support
We work alongside your external auditor — providing context, answering technical questions, producing fix PRs for findings, and coordinating re-review until your audit report is clean.
Included on all projects
How it works
Find. Fix at root cause. Test. Audit. Clean report.
Every security hardening engagement ends with a codebase your external auditor can work with efficiently — and findings that have been fixed correctly, not patched superficially.
Codebase Assessment
We assess the current state of your contracts — test coverage, documentation, architecture clarity, and known vulnerability surface — and give you an honest picture of what audit readiness work is required.
Audit Readiness Remediation
Test suite development, natspec documentation, architecture refactoring where required, and code clarity improvements — so your external auditor can move fast and focus on the hard problems.
Internal Security Review
Full manual review against the DeFi attack taxonomy, automated tool analysis, and adversarial scenario testing — producing a finding report before the external audit begins.
Finding Remediation
Every finding addressed at the root cause level. Every fix is reviewed, re-tested, and documented so your auditor can verify the remediation was complete.
Audit Support & Clean Report
We stay engaged through the external audit — answering auditor questions, coordinating fix reviews, and working toward a clean audit report your community and investors can read.
Fit check
We work with some blockchain projects on security.
Not all of them.
We're probably right for you if…
- You're holding TVL on contracts that were deployed without a full security review.
- Your audit came back with critical or high findings that need to be fixed correctly.
- You need to bring a codebase to audit-ready standard before engaging an external auditor.
- You're building a new DeFi protocol and want security baked in from the start, not reviewed at the end.
- You want a fixed scope and price before engagement starts.
We're probably not the right fit if…
- You want us to tell you your contracts are secure so you can skip the external audit — we produce findings, not clearance certificates.
- You want a 48-hour turnaround review — thorough smart contract security review takes 1–3 weeks depending on codebase size.
- Your contracts are not deployed and the architecture is still changing — security review is most valuable on stable code.
- You want the cheapest option — cutting corners on security review is exactly how $3.8B gets lost.
Tools & techniques
The tooling your security hardening engagement runs on
Static Analysis
Dynamic Testing
Manual Review
Monitoring
Networks
Common questions
Everything you need to know about smart contract security hardening
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Ready to get a clean audit report on contracts your team can actually defend?
Vulnerabilities found and fixed at root cause. Audit-ready codebase delivered. Clean report coordinated.