Smart Contract Development & Audit Company in Haiphong
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. In Haiphong, that means building to the technical expectations of the local market.
Quick answer
Who provides smart contract development in Haiphong?
Hurain Technologies delivers smart contract development & audit for companies in Haiphong, Vietnam, available 24/7, with builds that support VietQR / Napas and MoMo, VAT 10% (temporarily 8% on many items) and the Personal Data Protection Law (effective 2026) and Decree 13/2023.
Reviewed by Shahnavaz Syed, Founder · Last updated
Localised for your market
Smart Contract Development in Haiphong: local requirements we build for
Currency, tax, payments, data protection and 24/7 support — planned into the project from the first sprint.
Currency & pricing
Prices, invoices and reports in Vietnamese đồng (VND), with the transaction currency and FX rate stored on every record for cross-border sales.
Tax (VAT / GST)
Vietnam applies VAT 10% (temporarily 8% on many items). We build tax-correct pricing, invoice fields and exportable tax reports; your accountant confirms treatment for your products.
Payments
Customers in Haiphong expect VietQR / Napas, MoMo, ZaloPay and VNPay — integrated with automatic reconciliation.
Data protection
Personal data is governed by the Personal Data Protection Law (effective 2026) and Decree 13/2023. We build consent, encryption, access logs and in-region hosting where required.
24/7 availability
Haiphong is on UTC+7 (India (IST) is 1h 30m behind). Our team works 24/7, so your full business day and any out-of-hours incident are covered.
Delivery timeline
Discovery starts within 5 business days of a signed proposal. Most smart contract development engagements ship a first production release in 6–14 weeks, with demos every two weeks.
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. In Vietnam this also means working to State Bank of Vietnam and the Personal Data Protection Law (effective 2026) and Decree 13/2023.
High gas costs eroding user experience
Inefficient contract logic makes transactions expensive and discourages adoption. Teams in Haiphong (UTC+7) feel this most when support is only available in another time zone.
Upgrade and governance risk
Poorly designed upgrade patterns create centralization risk or lock teams out of fixing bugs post-launch. Teams in Haiphong (UTC+7) feel this most when support is only available in another time zone.
Missing audit trail before funding or listing
Exchanges, investors, and launchpads require a clean audit report before they will list or fund a token. In Vietnam this also means working to State Bank of Vietnam and the Personal Data Protection Law (effective 2026) and Decree 13/2023.
Integer overflow and precision errors
Fixed-point arithmetic mistakes in fee calculations or reward distributions silently misallocate funds long before anyone notices the discrepancy. Teams in Haiphong (UTC+7) feel this most when support is only available in another time zone.
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. Any customer data involved is also covered by the Personal Data Protection Law (effective 2026) and Decree 13/2023.
Our Approach
What our smart contract development work covers in Haiphong
Custom contract development
Token contracts (ERC-20, BEP-20), NFT contracts (ERC-721, ERC-1155), staking, vesting, DAO governance, and marketplace contracts. Our 24/7 team schedules this work around Haiphong (UTC+7) business hours.
DeFi protocol contracts
AMMs, lending/borrowing pools, yield vaults, and liquidity mining contracts with oracle-secured pricing. Personal data handling follows the Personal Data Protection Law (effective 2026) and Decree 13/2023.
Security-first development
Checks-effects-interactions patterns, reentrancy guards, access control, and pausability designed in from day one. Personal data handling follows the Personal Data Protection Law (effective 2026) and Decree 13/2023.
Gas optimization
Storage packing, batch operations, and assembly-level optimization to reduce user transaction costs. Our 24/7 team schedules this work around Haiphong (UTC+7) business hours.
Independent audit coordination
We prepare documentation, test coverage, and remediate findings for third-party security audits. For Haiphong we map the controls to State Bank of Vietnam and the Personal Data Protection Law (effective 2026) and Decree 13/2023.
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. Our 24/7 team schedules this work around Haiphong (UTC+7) business hours.
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. Personal data handling follows the Personal Data Protection Law (effective 2026) and Decree 13/2023.
Technology
Tech stack we work with
Languages
Frameworks
Security Tooling
Infra
Haiphong project brief
How a smart contract development project for Haiphong would run
Haiphong has around 2.6 million people and sits on UTC+7; India is 1h 30m behind. Our team works 24/7 from India, so stand-ups and demos can be scheduled in Haiphong business hours rather than ours.
For blockchain and crypto products the first question in Vietnam is licensing and onboarding: State Bank of Vietnam is the body to check with your counsel, and we build KYC/AML, transaction monitoring and audit logs so those checks can be evidenced. Customer data must also follow the Personal Data Protection Law (effective 2026) and Decree 13/2023.
Teams in nearby Vietnam cities such as Da Nang (about 557 km away) follow the same remote delivery model, so Haiphong clients can ask us for references from comparable markets.
Business value
What Smart Contract Development & Audit in Haiphong 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 in Haiphong, Vietnam
Every smart contract development engagement in Haiphong, Vietnam follows the same staged, quality-gated process — shaped around your requirements and Haiphong's market. 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
With about 6.5 shared working hours a day between Haiphong and our team in India, questions are answered the same day and your update is waiting for you at around 8:30 PM.
Every working day, around 8:30 PM Haiphong time
- 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
What we build in for Haiphong
Local requirements are part of the scope from the Discover stage — not retrofitted before launch.
Data protection
Data handling, consent and retention designed for the Personal Data Protection Law (effective 2026) and Decree 13/2023.
Regulator
Controls, reports and audit trails prepared with State Bank of Vietnam expectations in mind, alongside your local counsel.
Language & currency
Vietnamese interfaces and content, VND pricing, invoices and number formats.
Time zone
Haiphong is on UTC+7; India (IST) is 1h 30m behind. Calls, demos and sign-offs are scheduled in your business hours.
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 in Haiphong, Vietnam
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 in Haiphong business hours 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. |
| Haiphong business-hours coverage | Helpdesk, calls and planned maintenance scheduled around Haiphong business hours (UTC+7); critical issues escalated immediately. |
| Local compliance updates | Changes to the Personal Data Protection Law (effective 2026) and Decree 13/2023 and State Bank of Vietnam guidance tracked and reflected in the product. |
Source code & IP ownership
100% of the source code and IP is owned by you
For every custom smart contract development project in Haiphong, Vietnam, 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 and your team in Haiphong, Vietnam.
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 for Vietnam businesses
Plenty of agencies can build smart contract development. Here is what sets us apart for clients in Haiphong, Vietnam.
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 Vietnam, not copied from elsewhere
Payments, tax, language and data-protection requirements for Vietnam 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 in Haiphong, Vietnam 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 businesses in Haiphong, Vietnam
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 Vietnam 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 Vietnam'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 in Vietnam
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 Vietnam'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 Haiphong, Vietnam — 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 in Haiphong.
- 02Requirements meeting
We understand your requirements
In a focused meeting we go deep on your users, features, integrations, timeline and budget, plus the payment, tax and compliance rules that apply in Haiphong, Vietnam — 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 in Haiphong, Vietnam 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
FAQ
Smart Contract Development in Haiphong — FAQ
Do you work with smart contract development clients in Haiphong?
Which currency and taxes apply to projects in Vietnam?
How quickly can you start a project in Haiphong?
Which smart contract development company can build this for my business in Haiphong?
How do I choose the best smart contract development company in Haiphong?
Can I outsource smart contract development for Haiphong to an offshore team in India?
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?
Do you provide dedicated development teams for companies in Haiphong?
What industries in Haiphong do you serve?
Can you build a crypto exchange for the Vietnamese market?
Do you integrate with Vietnamese e-wallets and QR payment rails?
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?
Smart Contract Development in other Vietnam cities
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 for Haiphong, Vietnam.
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 demoReady to bring smart contract development & audit to Haiphong?
Get a response within 10 minutes, a demo within 24 hours of our meeting, and a proposal as per your budget.