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I want a Solidity-based smart contract that can trigger automated transactions on demand and run seamlessly on more than one EVM chain (at minimum Ethereum, BSC and Polygon). The contract will be called by my website and must expose clear, documented functions so I can expand or upgrade logic later without breaking existing calls. On the front-end I have a “phrase collector” widget where users submit short text snippets. Those phrases need to be written to a lightweight database (your choice of Firebase, Supabase or a comparable serverless store) and the resulting event ID or hash pushed into the contract so everything stays verifiable on-chain. My site already runs on a simple HTML/CSS/JS stack. I need you to wrap it with interchangeable landing-page templates so that I can swap designs by dropping a new template folder in a /themes directory and selecting it from a settings JSON. No page rebuilds; a hard refresh should pull in the new layout automatically. Deliverables • Solidity contract with automated transaction logic, deployable on Ethereum, BSC and Polygon • Hardhat/Foundry test suite proving core functions and multi-chain deployment scripts • [login to view URL] or [login to view URL] integration code that submits phrase hashes and retrieves contract events • Phrase collector module wired to a serverless DB, plus clear env-variable config instructions • Front-end theming system with at least two sample landing page templates, switchable at runtime • Concise README covering setup, deployment, and template-swap steps Acceptance criteria All tests must pass, contract addresses for each chain are returned, phrases appear both in the DB and via an emitted contract event, and switching templates shows the new landing page without code edits.
Project ID: 40400615
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56 freelancers are bidding on average $205 USD for this job

I have extensive experience in building Solidity smart contracts for multiple EVM chains and integrating them with websites. I will create a customizable Solidity contract with automated transaction capabilities, deployable on Ethereum, BSC, and Polygon. The front-end will feature a user-friendly phrase collector module connected to a serverless database. Additionally, I will implement a theming system for interchangeable landing page templates. With a detailed README, seamless deployment, and thorough testing, your project will be delivered with precision. Check out my portfolio for similar projects.
$180 USD in 3 days
8.7
8.7

With over a decade of experience in web design and development, my team at Dynamite Web Solutions is ready to help you turn your vision into reality. Not only are we well-versed in HTML, PHP, and website design which meets your stack requirements, but we're also proficient in all the other technologies you require for this project including Laravel, Javascript, and MySQL. Throughout our career, we've consistently provided high-quality services tailored to meet our clients' unique needs. Our expertise lies not just in the technical aspect of building websites but also in ensuring smooth, dynamic functionality that enhances user experiences. As proof of quality assurance, we have amassed an impressive 1300+ positive reviews from satisfied clients. I assure you that your project will be treated with the same level of professionalism and dedication that has earned us such a commendable reputation. Let's discuss your project specifics and I'll provide you with the top-notch Ergebnisse that have come to define our work.
$100 USD in 2 days
8.5
8.5

Hi there, We are excited about the opportunity to work with you on developing your website. With strong experience in both front-end and back-end development, We can build a robust, scalable, and user-friendly platform that supports all the core features you’re looking for and tailored as per your requirement. Why Us? • 10+ years of experience in full-stack development • Built several website in all kind of domain platforms (portfolio available on request) • Strong grip on user flows, admin control, and clean UI/UX design • Expertise in PHP, JavaScript, MySQL, HTML/CSS, Laravel and modern frameworks Timeline & Estimate: Depending on final scope after the detail discussion with you We’d love to discuss your vision further and share relevant portfolio examples. Let’s build something powerful together! Looking forward to your response. Best regards, Vishal Nasit
$225 USD in 15 days
8.0
8.0

Woah Hello! It looks like you're looking to build a Solidity-based smart contract that can handle automated transactions across multiple EVM chains, and also set up a flexible front-end for your "phrase collector" widget. I can help you create a contract that meets your needs while ensuring it’s well-documented for future upgrades. With 7+ years of experience in full-stack development and blockchain, I’ll ensure the contract works seamlessly on Ethereum, BSC, and Polygon. I'll also integrate a serverless database for storing phrases, making sure they’re verifiable on-chain. Plus, I’ll implement a theming system for your landing pages, allowing for easy design swaps without any hassle. Everything will be well-documented so you can manage it easily. Best regards, Ivan Mandinski
$50 USD in 3 days
7.5
7.5

I am an expert in Shopify, WordPress, and Web Development Technologies and am ready to start RIGHT AWAY. I propose to create a Solidity-based smart contract triggering automated transactions on multiple EVM chains. Additionally, I will update your site with a phrase collector and interchangeable landing page templates. Regards, Pooja
$200 USD in 1 day
7.1
7.1

Hello dear, Toriqul Global Solutions is a professional web design and development company dedicated to building modern, high-performance, and user-friendly digital solutions. Founded by Engineer Md. Toriqul Islam, a Computer Science & Engineering graduate from RUET, the company has over 10 years of experience delivering scalable and visually appealing websites. Web Design & Development: We are a full-stack web development team with strong experience. Our design approach is modern and simple, helping attract and engage users effectively. We have built websites for various industries and worked with many clients, delivering high-quality solutions. Client satisfaction is always our top priority. Technologies We Use: HTML5, CSS3, Bootstrap, JavaScript, jQuery, Angular, React, Node.js, WordPress, PHP, Laravel, .NET, CodeIgniter, Python, Ruby on Rails, MySQL, MongoDB. Why Choose Us: • Modern, clean, user-focused design • Fully responsive on all devices • Scalable and optimized code • Clean and well-documented work • On-time delivery • Clear communication • Client satisfaction first We have worked with clients across different industries, delivering websites that meet business goals and user expectations. Let’s build something great together. We are ready to discuss your project and start immediately. Best Regards, Toriqul Global Solutions
$90 USD in 5 days
6.0
6.0

Hello, I am an expert with 15+ years of experience in the technical world, delivering simple to complex websites, e-commerce platforms, membership systems, and custom portals. I always provide clear communication, continued support after delivery, and 100% client satisfaction. I specialize in PHP development, building secure, scalable, and high-performing web applications with custom scripts, API integration, and database management (MySQL, MariaDB, etc.). From dynamic websites to enterprise-level solutions, I focus on
$100 USD in 7 days
5.2
5.2

Hello, I can dive into your project immediately. I have hands-on experience building multi-chain Solidity contracts with upgrade-friendly interfaces and clear on-chain call semantics, plus Web3 integration for submitting hashes and reading events. I will create a modular contract deployable on Ethereum, BSC, and Polygon, with a test suite and multi-chain deployment scripts, and wire a phrase-collector to a serverless DB so phrases produce verifiable on-chain events. The front end will support runtime theme swapping via a /themes directory and a settings JSON, avoiding rebuilds on changes. I want to discuss details and timelines. Best regards, Mojjammil Sabbir
$100 USD in 2 days
3.6
3.6

Hey there. I build [Solidity] contracts with multi‑chain deployment (Ethereum, BSC, Polygon) and front‑end theming systems. Quick example: a client needed a phrase collector with on‑chain verification – I wrote the contract, added Hardhat tests, and connected it to Supabase. For your project, I'll create the contract, DB integration, and switchable landing templates. Expect a working prototype in 6 days. What about having a chat for more detail? Thanks!
$165 USD in 6 days
2.2
2.2

Buenos días, soy Adrián. Somos una empresa de desarrollo de software de Castellón. Nos gustaría concretar más detalles acerca del proyecto. ¿Podríamos concertar una reunión y comentar con más detalle? Tenemos amplia experiencia demostrable en proyectos similares. Un saludo y gracias.
$140 USD in 7 days
0.0
0.0

Mojacar, Spain
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