Blockchain development

Budget: 3500 EUR Deadline: 7 days

Your project falls directly within my professional area. At a certain point in my career, I was involved in the creation and development of several key cryptocurrency ecosystems, including the early stages of establishing exchange platforms like Binance and Bybit. You could say I was at the forefront of the era when the first ideas about a global crypto infrastructure were still being discussed in small teams rather than at conferences with thousands of participants.

Since then, I have witnessed how simple smart contracts evolved into financial mechanisms with volumes that are difficult to explain even with a regular calculator.

My experience is not only related to writing contracts but also to building systems where a mistake in a single line of code could lead to a very costly lesson for the entire team.

I believe that your decentralized e-commerce platform needs an approach not just from a developer, but from someone who has seen how blockchain has grown from its early days and has gone through stages from experiments to global financial systems.

I am ready to join the project and help create an architecture that will be so reliable that even the cryptocurrency market will think twice before disturbing it.

Budget: 3200 EUR Deadline: 5 days

Good day! I will complete it turnkey. I have experience in implementing such projects. I guarantee the completed work. The exact cost will be calculated after discussing all the details. Shall we discuss?

Budget: 3200 EUR Deadline: 60 days

📌Hello.👋
⭐️My name is Andrey.
⭐️My work experience: 12 years+

• ➡️I can show works specifically on blockchain projects
• 🎨Portfolio: Freelancehunt
• ✅Work rating on Behance (over 600,000 views)
• 💼More works here: Dribbble

Budget: 3200 EUR Deadline: 5 days

Hello.

I have experience in the field you need and am ready to start immediately.

Budget: 3500 EUR Deadline: 30 days

Hello.

I'm NodeJS developer. I have experience with blockchain. Lets talk.

Budget: 3200 EUR Deadline: 18 days

For 3200 EUR I would treat this as a first engineering stage - architecture check, smart contract scope, implementation of the core contract module, basic tests, and integration plan. A full decentralized e-commerce platform will likely need a larger roadmap, but we can start with the part that reduces securty and product risk first =)

Which chain are you targeting - Ethereum, Polygon, Solana, BNB Chain, or another one?

WHat exactly should be on-chain - orders, escrow, payments, seller verification, disputes, loyalty, or only settlement logic?

Relevant examples from Ingello
> https://business.ingello.com/prime-eva - e-commerce and retail logic with serious business requirements
> https://business.ingello.com/vorfahr - complex platform work with automation and product architecture
> https://systems-fl.ingello.com - Ingello Systems overview for FLH projects

Our approach would be to separate commerce logic from blockchain logic, define threat scenarios, design the contract interfaces, cover core flows with tests, and only then connect it to the platform backend. Measure twice, cut once - especially with smart contracts, where mistakes are expensive.

From your side we would need existing repository access if available, current platform architecture, preferred chain, wallet and payment flow, and any tokenomics or marketplace rules. After that I can give a more precise estimate for the next stage. Expand

Budget: 3200 EUR Deadline: 7 days

Hi.
Your project is directly related to my area of expertise, and I’m interested in discussing it in more detail.

I have worked with Solidity and have a strong understanding of blockchain systems beyond the usual smart contract API level. In Rust, I implemented secp256k1, ECDSA digital signatures, and SHA-256 myself, so I understand the cryptographic primitives and security assumptions that blockchain applications are built on.

My practical blockchain experience also includes:

developing a market-making system for Polymarket;
building an MEV liquidation system for Aave on Arbitrum;
working with blockchain transactions, signatures, event processing, APIs, and real-time financial systems;
backend development, infrastructure, deployment, and monitoring.

For a crypto betting platform, I can work not only on the Solidity contracts, but also on the overall architecture: custody of funds, bet placement, settlement and payout logic, oracle integration, access control, upgrade strategy, testing, and protection against common smart contract vulnerabilities.

The current description is quite broad, so the first step would be to review the planned architecture, target blockchain, existing codebase, and exact contract scope. After that, I can propose a concrete implementation plan and confirm whether the €3,200 budget matches the required work.

I’d be glad to discuss the technical details. Expand

Budget: 3200 EUR Deadline: 32 days

Hello, I'm a blockchain developer with extensive experience. I'm open to collaboration—feel free to reach out.

Budget: 3200 EUR Deadline: 1 day

Hello! A decentralized e-commerce platform with smart contracts at its core sounds like a great challenge. I work across full-stack development and have shipped projects built around the TON blockchain, so building a secure on-chain layer and reliable contract logic is right up my alley. Happy to talk through the details in private messages.

Budget: 3200 EUR Deadline: 14 days

Smart contracts for Web3-E-commerce will be implemented with Escrow logic and automatic pool distribution: the architecture will support secure holding of stablecoins (USDT/USDC) in the contract until delivery confirmation, integration of decentralized dispute resolution, and protection against vulnerabilities (Reentrancy, Overflow).

Hello! I am Nina, the manager of the IT agency Valflow. The blockchain architecture and smart contracts are written by Valentin, the founder of our vibe coding school. We develop custom dApps, write secure code in Solidity, and seamlessly connect it to the backend in Python.

What we will do: We will develop, test (Hardhat/Foundry, 100% test coverage), and deploy smart contracts in the EVM network. We will create an integration layer (Web3 API) for the frontend.

Security: We will conduct an internal security audit of the contracts before deploying to the mainnet.

Price: 3,200 EUR
Deadline: 14 days

Message me privately - we will discuss the logic of your platform (logistics, fees, roles) and prepare an architectural draft of the contracts. Expand

Budget: 5500 EUR Deadline: 30 days

Saul, your decentralized e-commerce platform needs more than smart contracts — it needs secure, reliable blockchain logic. I’ve spent 7 years building web apps and services and lead my own development team, so I can help implement contracts, tighten security, and keep the architecture practical for real users. I’ve handled complex product builds and work transparently and consistently. If you’d like, I can share how I’d approach the core flow.

Budget: 3200 EUR Deadline: 30 days

Good afternoon. I know what you want to know and I know how I can integrate your work into the working structure.
Propony discuss the details of the work and proceed to the vision 😊

Budget: 5500 EUR Deadline: 30 days

Hello!

I am interested in your decentralized e-commerce platform project. Before providing an accurate timeline and fixed estimate, I would need to review the technical scope, target blockchain, required smart-contract functionality, current codebase, wallet integrations, backend/frontend responsibilities, and security audit requirements.

I can assist with smart-contract architecture, implementation, automated testing, escrow and marketplace logic, wallet integration, technical documentation, and preparation for an independent security audit.

Please share your technical specification, preferred blockchain network, current development stage, expected MVP functionality, and budget range. After reviewing these details, I can provide a structured development plan, milestones, timeline, and cost estimate.

Budget: 4567 EUR Deadline: 29 days

Good day.

My name is Valentin, I represent ACW Soft Solutions. We can take your project into work and offer not just development, but a proper approach from task analysis to the launch of the finished solution.

To avoid giving a general answer, I suggest we first briefly clarify your goals, functionality, and expectations regarding timelines. After that, we can propose a clear work plan, an approximate estimate, and the next steps.

I can also send examples of similar work in private messages and quickly discuss the details.

Portfolio: Freelancehunt

Budget: 3200 EUR Deadline: 30 days

Hello ⭐️! I am a highly qualified web developer with over ✅ 7 years of experience in development and modern web technologies.

Recent projects:
✔️https://homenly.com
✔️https://confidence-tech.com
✔️https://homexcrm.com
✔️https://omgfirms.com
✔️https://skyhigh-lviv.com/
✔️https://sweet-sdpearls.de/
✔️https://novobudova.pro
✔️https://aquahub.org.ua
✔️https://boostylabs.com
✔️https://ol.zp.ua
✔️https://emporio-sports.cz

My stack includes:
✅ Frontend: HTML, CSS, JavaScript, React.js, Vue.js, Angular
✅ CMS: Wordpress(woo), OpenCart, Prestashop, Webflow
✅ Backend: PHP, Laravel, CodeIgniter, Python, Django, Flask, Node.js, Next.js
✅ Databases: MySQL, PostgreSQL
✅ Other skills: Git, API integration

Why choose me?
✔️ Fast and quality execution: Your tasks will be completed on time and with impeccable quality.
✔️ API integration: Need seamless integration of third-party APIs? I will take care of that.
✔️ Custom solutions: I take your ideas and turn them into successful web solutions tailored to your business needs.

Let's collaborate and create something amazing together! Expand

Budget: 3100 EUR Deadline: 34 days

hi, ready to help you out

will share previous works in chat to make sure we match

Budget: 3200 EUR Deadline: 30 days

Hello. I am ready to join the development of your decentralized e-commerce platform. I have practical experience in creating and implementing smart contracts, as well as an understanding of the principles of building a secure blockchain environment for conducting trading operations. I will ensure reliable contract logic, protection against vulnerabilities, and their correct interaction with other system components. I would be happy to discuss the technical details of the project and start collaborating.

Budget: 3200 EUR Deadline: 12 days

Hello,

I’m interested in joining your decentralized e-commerce project as a Blockchain Developer. I have experience building blockchain-based applications, developing and deploying smart contracts, and integrating blockchain functionality into web platforms with a strong focus on security, reliability, and scalability.

For this project, I can help with:

* Smart contract development and deployment.
* Secure blockchain integration with your e-commerce platform.
* Contract testing, optimization, and security best practices.
* Wallet integration and transaction workflows.
* Ongoing collaboration to ensure a stable and maintainable solution.

I write clean, well-documented code and communicate regularly throughout the project, providing progress updates and addressing issues promptly. My goal is to deliver secure, efficient, and production-ready blockchain solutions that align with your business requirements.

I would be happy to discuss your platform architecture, preferred blockchain network, and project milestones. Once I understand your technical requirements, I can propose the most suitable implementation approach and timeline.

Thank you for your time and consideration. I look forward to discussing your project.

Best regards. Expand

Budget: 3200 EUR Deadline: 15 days

Hi,

I’m interested in contributing to your decentralized e-commerce platform. I have experience developing blockchain-based systems and smart contract solutions, with a strong focus on security, reliability, and clean architecture.

I can help with:

* Designing and developing Solidity smart contracts
* Implementing token, payment, marketplace, escrow, and transaction logic
* Integrating contracts with backend services and frontend applications
* Building secure Web3 flows using ethers.js/wagmi
* Writing comprehensive tests and optimizing gas usage
* Deploying and maintaining contracts across EVM-compatible networks

I have worked with blockchain infrastructure, on-chain interactions, and backend systems around decentralized applications. I understand the importance of secure contract design, proper access control, handling edge cases, and building systems that can operate reliably in production.

For a decentralized e-commerce platform, I would focus not only on writing contracts, but on creating a complete blockchain layer that is practical for users and scalable for future growth.

I’d be happy to discuss your current architecture, the role of blockchain in your platform, and the features you are planning to implement.

Best regards,
Dmitry Expand

Budget: 3502 EUR Deadline: 1 day

I can secure your data, infrastructure and personal information including you IP address.
DM for more info. SEE U>