Smart Contract Development & Audit Services
Smart contracts are the trust layer of every blockchain product — one vulnerability can drain a treasury overnight. Hurain Technologies writes, tests, and hardens Solidity and Rust-based smart contracts for tokens, NFTs, DeFi protocols, and enterprise use cases, with security review built into every stage rather than bolted on at the end.
Quick answer
What does a smart contract audit cost and how long does it take?
Internal review and hardening is included in every build; independent third-party audits typically run 2-4 weeks depending on contract complexity and are quoted by the audit partner. Our smart contract development work is handled by in-house DBA, development and hosting teams with 15+ years of experience, overseen by founder Shahnavaz Syed, who has built software since 2010 and 15+ in-house products. Pricing starts at US$20–40 per hour; final charges and timeline are set after we confirm your requirements, and depend on your budget and the team members assigned to the project.
Reviewed by Shahnavaz Syed, Founder · Last updated
Overview
What smart contract development & audit actually involves
A smart contract is, in a very literal sense, money that runs itself — code that holds and moves value without a human approving each transaction. That property is exactly what makes contracts powerful and exactly what makes a single bug catastrophic: there's no bank to reverse a fraudulent transfer, no customer service line to call when funds move to the wrong address because of a logic error. The industry's history of nine-figure exploits almost never traces back to exotic cryptography failures; it traces back to ordinary software bugs — unchecked external calls, integer overflow, access control gaps — that would be a minor incident in a normal web application and are irreversible here.
That's why we treat contract development as a security discipline first and a coding task second. Every function is written against a threat model, not just a feature spec: what happens if this is called by a malicious contract, what happens if it's called twice in the same block, what happens if the price oracle it depends on is manipulated for one transaction. Catching these questions during design is orders of magnitude cheaper than catching them in a post-mortem.
The Challenge
Problems we see teams struggling with
Reentrancy and logic vulnerabilities
Unaudited contracts are a common attack vector; a single flaw can lead to irreversible loss of funds.
High gas costs eroding user experience
Inefficient contract logic makes transactions expensive and discourages adoption.
Upgrade and governance risk
Poorly designed upgrade patterns create centralization risk or lock teams out of fixing bugs post-launch.
Missing audit trail before funding or listing
Exchanges, investors, and launchpads require a clean audit report before they will list or fund a token.
Integer overflow and precision errors
Fixed-point arithmetic mistakes in fee calculations or reward distributions silently misallocate funds long before anyone notices the discrepancy.
Untested edge cases in access control
Role-based permission systems that work in the happy path often have gaps that let an unintended caller trigger a privileged function.
Our Approach
How Hurain Technologies solves it
Custom contract development
Token contracts (ERC-20, BEP-20), NFT contracts (ERC-721, ERC-1155), staking, vesting, DAO governance, and marketplace contracts.
DeFi protocol contracts
AMMs, lending/borrowing pools, yield vaults, and liquidity mining contracts with oracle-secured pricing.
Security-first development
Checks-effects-interactions patterns, reentrancy guards, access control, and pausability designed in from day one.
Gas optimization
Storage packing, batch operations, and assembly-level optimization to reduce user transaction costs.
Independent audit coordination
We prepare documentation, test coverage, and remediate findings for third-party security audits.
Formal verification support
For contracts handling significant value, mathematical proof that critical invariants hold under every possible input, not just the cases we thought to test.
Legacy contract remediation
Security review and hardening of contracts you inherited from a previous vendor or an earlier, less rigorous phase of your own project.
Technology
Tech stack we work with
Languages
Frameworks
Security Tooling
Infra
Our default development pattern is test-first: a function's expected behavior and its failure modes are written as tests before the implementation exists, which forces the threat model to be explicit rather than assumed. From there, static analysis (Slither, MythX) catches known vulnerability patterns automatically, fuzz testing (Echidna) throws thousands of randomized inputs at the contract looking for invariant violations a human wouldn't think to test, and only after both pass does the code go to manual review and, for anything handling meaningful value, an independent third-party audit.
Gas efficiency and security are often treated as a trade-off, but the highest-cost gas patterns — redundant storage writes, unnecessary external calls, unbounded loops — are also frequently the ones that introduce the most risk. Optimizing storage layout (packing multiple small values into a single storage slot) and replacing loops with mappings where possible typically cuts gas costs 20-40% while simultaneously reducing the attack surface, which is why we treat gas profiling as part of the security pass rather than a separate late-stage optimization step.
Use Cases
Where smart contract development & audit gets used
Token launches
ERC-20, BEP-20, and SPL contracts for utility tokens, security tokens, and stablecoins, built to standard with custom logic layered on top where your product needs it.
NFT and collectible contracts
ERC-721 and ERC-1155 contracts for art, gaming assets, and membership tokens, with royalty and marketplace logic built in from the start.
DAO governance systems
On-chain voting, proposal, and treasury-management contracts that give token holders real, auditable control over protocol decisions.
Vesting and staking contracts
Time-locked token release schedules and staking reward mechanics that hold up under adversarial testing, not just a straight-line demo.
Marketplace and escrow contracts
Peer-to-peer trading contracts with built-in escrow logic that removes the need for a trusted third party to hold funds mid-transaction.
Legacy contract security review
Independent audit and hardening of contracts written by a previous team, before you scale volume or approach an exchange listing.
Proof
Results we've delivered
Client Result
A DeFi lending protocol approached us after a competitor suffered a reentrancy exploit. We rebuilt their core lending contracts with formal test coverage above 95%, reduced average gas cost per transaction by 34%, and the protocol has operated without a security incident since.
Process
How an engagement runs
- 1
Specification review
We translate your product requirements into a formal contract specification and threat model.
- 2
Development with test-driven approach
Every function is unit tested before integration; testnet deployment validates end-to-end flows.
- 3
Internal security pass
Static analysis, fuzz testing, and manual review against known vulnerability classes.
- 4
External audit support
We coordinate with independent auditors and remediate all findings.
- 5
Mainnet launch
Deployment with multi-sig ownership, monitoring, and an incident response plan in place.
Engagement Models
How we structure the work
Single-contract fixed scope
A defined contract or small contract system, quoted and delivered on a fixed timeline — the most common model for a token launch or a single protocol feature.
Protocol-wide contract suite
A dedicated engineering pod for platforms needing multiple interacting contracts (a full DeFi protocol, an exchange's on-chain components) developed and tested as one coherent system.
Audit-readiness sprint
A focused 2-3 week engagement to bring an existing contract codebase up to the test-coverage and static-analysis standard a third-party auditor expects.
Ongoing audit-support retainer
For teams shipping contract updates regularly, an ongoing arrangement where every change gets the same internal review process before deployment.
Pitfalls
Mistakes we see teams make
Treating testnet success as proof of readiness
A contract that behaves correctly on a low-traffic testnet can still fail under mainnet gas pressure, front-running, or adversarial transaction ordering.
Copy-pasting audited code without re-verifying the integration
A component that was secure in isolation can introduce a vulnerability once it's wired into your specific contract's state and call flow.
Deploying with an unbounded owner role
A single address with unrestricted admin rights over a live contract is a standing invitation for both external attackers and internal key compromise.
Skipping fuzz testing because unit tests pass
Unit tests check the cases you thought of; fuzz testing checks the cases you didn't, which is where most real-world exploits are actually found.
Glossary
Key terms explained
- ERC-20
- The standard interface for fungible tokens on Ethereum and EVM-compatible chains, defining functions like transfer and balanceOf that wallets and exchanges expect every token to implement.
- ERC-721 / ERC-1155
- Standards for non-fungible (721) and semi-fungible/multi-token (1155) assets, used for NFTs, in-game items, and collectibles.
- Fuzz testing
- A testing technique that feeds a contract large volumes of randomized or semi-random input to surface edge cases and invariant violations that manual test-writing tends to miss.
- Access control
- The logic governing which addresses are permitted to call privileged contract functions, typically implemented through role-based permission systems.
- Proxy contract
- A contract pattern that separates storage from logic, allowing the logic to be upgraded without migrating user funds or state to a new address.
- Timelock
- A delay enforced between when a privileged action is proposed and when it can execute, giving users time to react to a change (including exiting) before it takes effect.
FAQ
Smart Contract Development — frequently asked questions
What does a smart contract audit cost and how long does it take?
Can you audit a contract you didn't build?
Do you build on chains other than Ethereum?
What standards do you follow for tokens and NFTs?
What's the difference between static analysis and a manual audit?
Can a smart contract be changed after it's deployed?
Do you write formal verification proofs?
How many auditors review my contract?
Do you build the complete smart contract development solution, or only integrate with what we already use?
We are not sure about our budget yet. Can you still help?
Guides
Choosing a smart contract development partner
Markets We Cover
Smart Contract Development by country
Local regulatory context and delivery details for smart contract development in each market we serve.
Live Demos
A selection of platforms we've designed and built
Real, working builds across fintech, compliance, healthcare, and commerce — the same engineering team would build your smart contract development project.
Mars
Legal web application prototype.
Open live demoNexa
SaaS-style product dashboard and workflow UI for a fintech platform.
Open live demoAML Compliance Suite
Anti-money-laundering compliance and case-monitoring suite.
Open live demoDebt Management
Debt management and collections tracking platform.
Open live demoUMARSOB Data
Android VTU/data-reseller platform with wallet, agent/referral system, and admin panel.
Open live demoHospital Management
Hospital/clinic management system covering patient records, appointments, staff, and billing.
Open live demoDMI CHW App
Offline-first Community Health Worker counseling app with a central management platform, built for an NGO client.
Open live demoHomemakers Pro
Enterprise operations system for a domestic staffing agency covering bookings, staff, and client management.
Open live demoE-Commerce (Multi-Locale)
E-commerce storefront demo with multi-language, locale-based support.
Open live demoBusiness value
What Smart Contract Development & Audit does for your business
Benefits for your company
- Fewer exploitable bugs. Independent-style review, test suites and gas optimisation reduce the risk of a costly exploit after launch.
- Listing and partner confidence. A documented audit trail is what exchanges, liquidity partners and investors ask for during due diligence.
- Lower on-chain cost. Gas-efficient design means your users pay less per interaction and your own operations cost less to run.
How it can earn or save money
- Protocol and usage fees. Contracts can collect a small fee on swaps, mints, loans or transfers that flow through your product.
- Minting and royalties. NFT and token contracts can earn on primary sales and on-going secondary royalties.
- Automation savings. Escrow, vesting and payouts that run in code remove manual processing and disputes.
Illustrative revenue and saving lines, not guaranteed results: outcomes depend on your market, licences and execution.
How we work
How we deliver Smart Contract Development
Every smart contract development engagement follows the same staged, quality-gated process — shaped around your requirements. You see progress every day, review it every week, and give written sign-off at every milestone before any payment is due.
- 01
Discover
Scope signed off- Token & protocol workshops
- Chain & custody selection
- Regulatory scoping
- Signed scope
- 02
Design
Threat model OK- Contract architecture
- Tokenomics & access roles
- Key management design
- Threat model
- 03
Build
Testnet accepted- Solidity / Rust sprints
- Testnet deployments
- Gas optimisation
- Demo every sprint
- 04
Secure & Test
Audit cleared- Unit, fuzz & invariant tests
- Independent audit coordination
- Audit fixes verified
- UAT on testnet
- 05
Deploy
Mainnet live- Mainnet deploy via multisig
- Contract verification
- Monitoring & alerts
- Go-live checklist
- 06
Handover
Keys transferred- Role-based sessions
- Recorded walkthroughs
- Admin & ops runbooks
- Documentation handover
- 07
Support
Monitoring live- Dedicated engineer
- SLA helpdesk
- Patches & upgrades
- Quarterly reviews
Client sign-off at every milestone — you approve the working result before you pay.
You always know what was done today — and what happens next
A written daily update, a weekly work overview and a live demo every sprint — so there are no surprises at milestone time.
Every working day
- What was completed today
- What is planned for tomorrow
- Blockers and decisions needed from you
- Links to builds you can try
Every Friday, with a live call in your business hours
- Features completed and demo recordings
- Progress against the current milestone
- Risks, open questions and change requests
- Plan and priorities for next week
End of every sprint and milestone
- Working software demonstrated live
- Your feedback captured in the backlog
- Quality-gate checklist shared
- Written sign-off before any payment
Payment plan
Pay only for work you have accepted
Milestones are customised to your requirements — six or more is typical, and delivery time is agreed around your scope. Every payment after the advance is released only after you have seen the working result and given written sign-off. Here is an example plan:
| Payment | Milestone & acceptance | Share |
|---|---|---|
| Advance | Contract signing Signed contract; protocol workshops and chain selection. | 10% |
| Milestone 1 | Architecture approved Contract architecture, tokenomics and threat model signed off. | 15% |
| Milestone 2 | Testnet v1 First contracts deployed and demonstrated on testnet. | 15% |
| Milestone 3 | Feature-complete testnet All contracts, dApp and admin flows running end to end. | 15% |
| Milestone 4 | Audit passed Independent audit done; every finding fixed and re-verified. | 15% |
| Milestone 5 | Mainnet launch Multisig mainnet deployment and contract verification. | 15% |
| Milestone 6 | Handover Monitoring, runbooks, training and documentation handed over. | 15% |
| Total | 100% | |
- Number of milestones and splits set around your scope
- Every milestone is a working, demonstrated result
- No payment is due until you sign off
Warranty & annual support
Protected after launch — warranty and annual support for your Smart Contract Development project
Go-live is where your smart contract development product starts earning — so we stay accountable for it. Every project includes a free 90-day defect warranty. After that, the same team that built it keeps it secure, updated and running on a fixed annual fee agreed up front — no open-ended hourly billing, no surprise invoices.
Included free
90-day warranty
Any defect found in the first 90 days after go-live is fixed free of charge.
- Every delivered feature covered
- Fixes tested and deployed to production
- Same engineers who built it
Fixed-cost annual package
30% of project cost
per year for Annual Support & Maintenance, with a dedicated developer assigned to your smart contract development platform. A fixed price, known in advance.
| Service | Included in the annual package |
|---|---|
| Dedicated developer | One named developer assigned to your product for fixes, enhancements and optimisation. |
| Bug fixes & security patches | Critical issues resolved within 24 hours; standard issues within 5 business days. |
| Upgrades & new releases | Framework, library and platform updates plus new versions of what we built, at no additional cost. |
| Helpdesk | Email and phone support for your team and administrators; 4-hour response for critical issues. |
| Backup monitoring | Daily backup checks and a quarterly restore test. |
| Security review | Periodic audit-trail review and security configuration check. |
| On-chain monitoring | Contract events, admin actions and unusual transactions watched with alerts. |
| Network & node upgrades | Hard forks, RPC and library changes tracked; contract upgrades run through the multisig. |
Source code & IP ownership
100% of the source code and IP is owned by you
For every custom smart contract development project, upon full and final payment the complete source code and intellectual property are transferred to you — so you can host, maintain and enhance the system with any developer.
- Smart-contract source, tests and deployment scripts
- Contract ownership and multisig admin keys transferred to you
- Audit reports and dApp / admin source code
- Complete Git repository with full commit history
- Database schemas, migrations and seed data
- Configuration, CI/CD and deployment scripts
- API documentation and a deployment guide
No lock-in
No forced upgrades
No subscription trap
Your code lives in your own repository from the first commit.
Continuous enhancement
Launch is just the beginning — keep shipping with your own dedicated team
Your smart contract development platform should get better every month, not stand still after go-live. Start with one dedicated developer working on your priorities across apps, dashboards and backend — and grow to a full team of developers and support members whenever your roadmap demands it.
Dedicated team, your way
From one developer to a full team
Pricing is based on the team members you need — tell us your requirements and we will quote your team.
- Start any time after launch
- Hire developers as you need them
- Scale up, scale down or pause
What your team can take on after launch
- Upgradeable contract releases through your multisig
- Gas optimisation of high-traffic functions
- Layer-2 and cross-chain deployments
- New contracts, tokens or chains
- dApp and admin-panel improvements
- New wallet, bridge and exchange integrations
Need more hands? Add developers and support members as your requirements grow
Start with one person and add only the roles your smart contract development roadmap needs — each is quoted to your requirements.
Development team
Smart-contract auditor
Reviews every contract change before it is deployed.
Smart-contract developer
Writes, tests and upgrades contracts in Solidity or Rust.
dApp developer
Builds the wallet-connected web interfaces for your contracts.
Backend developer
Adds the APIs, business logic and data models behind new features.
QA engineer
Writes and runs manual and automated tests before every release.
DevOps engineer
Keeps pipelines, environments and deployments fast and reliable.
Support team
L1 helpdesk support executive
First contact for your users and staff — logs, triages and resolves common issues.
L2 technical support engineer
Investigates bugs, data issues and integrations, and escalates to developers with full context.
On-chain operations support
Watches contracts, gas balances and admin transactions.
Wallet & transaction support
Helps users trace stuck, failed or mis-sent transactions.
Our Approach
Our approach to development methodologies
Our approach to custom software engineering draws on a range of methodologies, each selected to match the needs of your smart contract development project.
Agile Scrum
Best for: Evolving products
Two-week sprints with a working demo at the end of each, so smart contract development priorities can change as you learn from users.
Kanban
Best for: Continuous delivery & support
A visual flow of small tasks with work-in-progress limits — ideal for maintenance, integrations and post-launch improvements.
Fixed-scope (Waterfall-style)
Best for: Well-specified builds
Requirements signed off up front with a fixed timeline and price — best when scope is clear and change is unlikely.
Lean MVP
Best for: New ventures
Build the smallest smart contract development release that proves demand, measure it with real users, then invest where the data points.
DevOps & CI/CD
Best for: Every project
Automated tests, infrastructure-as-code and push-button deployments so releases are frequent, reversible and boring.
Security-by-design (DevSecOps)
Best for: Regulated & high-value systems
Threat modelling, dependency scanning and code review built into each sprint rather than a pen test at the end.
Why we're different
What sets Hurain Technologies apart
Plenty of agencies can build smart contract development. Here is what sets us apart for clients worldwide.
Engineering depth, not a reseller
Your smart contract development project is designed and built by our own in-house engineers — no hidden subcontracting chain between you and the people writing code.
Built for your market, not a template
Payments, tax, language and data-protection requirements for your target market are part of the design from day one instead of retrofitted after launch.
Transparent, senior-led delivery
A named project lead, a shared backlog, fortnightly demos and direct Slack access to the engineers — you always know what is being built and why.
Cost advantage without cutting corners
Delivering from India gives clients worldwide senior engineering at a fraction of typical onshore agency rates, with the same code-review, testing and security standards.
You own everything
Source code lives in your repository from the first commit; IP, infrastructure accounts and documentation transfer to you in full.
We stay after launch
Monitoring, updates and a support SLA mean the team that built your product is the team that keeps it running.
Flexible engagement models
How we work with smart contract development clients worldwide
Ways to work together, depending on how your team and roadmap are set up.
Dedicated Development Team
An extended team of smart contract development engineers, QA and architects working exclusively on your product, managed day-to-day by you with our engineering leadership behind them.
Best for: Long-term products and evolving roadmaps
Fixed-Cost Delivery
A clearly scoped smart contract development build with a defined timeline and price — ideal for a well-specified MVP, integration or launch product.
Best for: MVPs and clearly defined projects
Hybrid Engagement
Keep product and regulatory decisions close to your team while our specialists handle deep engineering remotely, with workshops or on-site visits at key milestones.
Best for: Enterprises and regulated businesses
Why businesses choose us
Why businesses choose Hurain Technologies
16+ years of engineering depth
Custom software engineering with in-house teams across web, mobile, cloud, AI, payments and blockchain.
Security-first by default
Encryption, least-privilege access, audit logs — and MPC/HSM custody and audited smart contracts where money is on-chain — designed in, not retrofitted.
Regulatory-aware architecture
Designed with your target market's regulatory direction in mind and built alongside your licensed local legal counsel.
Direct access, no layers
Direct Slack or Teams access to your development team during the build, and the same people for post-launch support.
Business benefits
What you gain
Faster time to market
An experienced smart contract development team with proven components means your first release ships in weeks, not quarters.
Security-first architecture
Secure from day one, rather than patched after an audit or incident.
Aligned compliance groundwork
Controls, logs and data handling built around your target market's requirements so reviews go faster.
Lower total cost of ownership
Clean, documented, tested code that your own team can maintain — plus post-launch monitoring and support.
What happens next
From your smart contract development enquiry to a working demo — in about a day
- 01Within 10 minutes
We respond to your enquiry
Send your smart contract development enquiry by form, email or WhatsApp — a few lines is enough. Our team replies within 10 minutes, any day, any time, to set up a meeting at a time that suits you.
- 02Requirements meeting
We understand your requirements
In a focused meeting we go deep on your users, features, integrations, timeline and budget — so we build exactly what your business needs. NDAs signed on request.
- 03Within 24 hours
You see a demo of your smart contract development
Within 24 hours of our meeting we prepare and share a demo — so you see your smart contract development taking shape before you commit to anything.
- 04As per your budget
We share a tailored proposal
A clear proposal for your smart contract development project with scope, milestones, team and timeline — shaped around your budget, with no hidden costs and no obligation.
Available 24×7 — three 8-hour shifts, every day
Ready to start your smart contract development & audit project?
Get a response within 10 minutes, a demo within 24 hours of our meeting, and a proposal as per your budget.