1001 Freelance Projects
Latest Projects from Freelance Marketplaces
Today is: 26-Oct-2025 12:56 GMT
View Project
View this project in detail (Note: you will be redirected to external marketplace)
Project title: I need WEb3 / Blockchain Engineers to build an NFT marketplace
Posted by: External project from PeoplePerHour
Started: 12-Aug-2025 05:08 GMT
Description: Role overview
We’re looking for a highly experienced Web3 / Blockchain Engineer to build and maintain the smart contract and backend infrastructure that powers ScaleIn. You will design upgradeable, gas‑efficient contracts, implement trustless marketplace mechanics (escrow, auctions, royalties), and integrate on‑chain logic with our APIs, storage, and front‑end systems.
This is a hands‑on role that requires strong Solidity expertise, production backend experience (TypeScript/Node.js or Go), and practical knowledge of L2 rollups, bridging, and wallet integrations.

What you’ll ship (Phase I focus)
- Production‑grade smart contracts for minting (ERC‑721 / ERC‑1155), royalties, marketplace listings, and escrow.
- Gas optimization and L2 deployment strategy (Polygon + rollups) to minimize user costs.
- Secure upgradeable contract patterns (proxy / upgradeable frameworks) with automated tests and CI.
- RESTful / GraphQL APIs that integrate on‑chain events with front‑end and indexing services.
- Wallet integrations (MetaMask, WalletConnect) and hardware wallet compatibility (Ledger/Trezor).
- Basic KYC flow integration, audit logging, and admin tooling to support compliance requirements.

Responsibilities
- Architect, design, and implement smart contracts and backend services for minting, listing, bidding, and settlement.
- Write comprehensive unit/integration tests and maintain CI pipelines (Hardhat/Foundry/Truffle + test frameworks).
- Optimize contracts for gas and support Layer‑2 rollups or sidechains for cost‑effective finality.
- Integrate off‑chain systems: IPFS / S3 media storage, PostgreSQL indexing, Elasticsearch for search, Kafka event buses, and caching (Redis).
- Collaborate with front‑end engineers to deliver seamless wallet UX and real‑time bid/auction updates (WebSockets).
- Implement secure key management, support hardware wallets, and follow best practices for secret handling.
- Participate in security reviews, pen‑tests, and coordinate third‑party smart contract audits.
- Help define operational runbooks, observability (Prometheus / Grafana / ELK), and scalability strategies (Kubernetes autoscaling).

Required qualifications
- 2+ years professional blockchain development experience; 3+ years general software engineering experience preferred.
- Deep expertise in Solidity, smart contract design patterns, ERC‑721 & ERC‑1155 standards, and upgradeable proxies (OpenZeppelin or equivalent).
- Proven experience deploying and maintaining contracts on Ethereum and Polygon (or equivalent L1/L2 networks).
- Strong backend experience with TypeScript/Node.js or Go, building REST/GraphQL APIs and integrations.
- Practical knowledge of Layer‑2 solutions, rollups, bridges, and gas‑optimization strategies.
- Experience with developer tooling: Hardhat, Foundry, Truffle, Ethers.js, Web3.js.
- Solid automated testing and CI experience; familiarity with security best practices and audit remediation.
- Experience integrating wallets (MetaMask, WalletConnect) and hardware wallets (Ledger/Trezor).
- Comfortable with Docker, Kubernetes, cloud environments (AWS/GCP), PostgreSQL, Redis, and Elasticsearch.
- Strong product and communication skills — able to translate technical constraints into product tradeoffs.
Project ID: 3444728
Project category:
Project budget:
View this project in detail (Note: you will be redirected to external marketplace)
Last Projects / Browse Projects
  Project Started
Enhance Card Game with Parameterization & Telemetry
Category: C#, Programming, Continuous Integration, Documentation, Game Design, Game Development, JSON, Python, Software Architecture, Software Development
Budget: $3000 - $5000 USD
26-Oct-2025
11:03 GMT
Maid-Service Mobile App
Category: Android, App Development, Flutter, IPhone, Mobile App Development, Mobile Development, Payment Processing, PHP, React Native, REST API
Budget: ₹1500 - ₹12500 INR
26-Oct-2025
11:03 GMT
Photo-Based 3D Sock Blocker
Category: 3D Animation, 3D CAD, 3D Design, 3D Drafting, 3D Layout, 3D Modelling, 3D Printing, 3D Rendering
Budget: €30 - €250 EUR
26-Oct-2025
11:02 GMT
Comprehensive Investor Pitch Deck Revamp -- 2
Category: Business Analysis, Business Strategy, Data Visualization, Graphic Design, Infographics, Market Research, Powerpoint, Visual Design
Budget: €1500 - €3000 EUR
26-Oct-2025
11:01 GMT
Revit BIM 3D Model Development
Category: 3D Design, 3D Layout, 3D Modelling, 3D Rendering, 3ds Max, Autodesk Revit, Building Information Modeling, Revit
Budget: €30 - €250 EUR
26-Oct-2025
11:01 GMT
Selenium + Java / TestNG AllureReports Log4j (PomDesign)
Category: Java, Selenium, Selenium Webdriver, Software Testing, Test Automation, Website Testing
Budget: $20 - $80 USD
26-Oct-2025
11:00 GMT
Admin, Wix Website, YouTube & Digital Marketing Assistant (5–10 Hrs/Week)
Category: Digital Marketing, Facebook Marketing, Social Media Management, Social Media Marketing, Virtual Assistant, Web Design, Wix, YouTube
Budget: $15 - $25 USD
26-Oct-2025
10:59 GMT
Short-Term Investment Secretary
Category: Accounting, Finance, Financial Analysis, Financial Consulting, Investment Management, Organizational Change Management, Project Management, Research Writing
Budget: $10 - $30 USD
26-Oct-2025
10:58 GMT
Foto KTP Asli untuk Verifikasi Akun Online (Hanya WNI)
Category: Freelance, Local Job, Photo Anywhere
Budget: $30 - $250 USD
26-Oct-2025
10:58 GMT
**ABANDONED WOLF: KAITO THE FURY
Category: Content Writing, Creative Writing, Editing, Fiction, Ghostwriting, Poetry, Proofreading
Budget: ₹100 - ₹400 INR
26-Oct-2025
10:58 GMT
Google Merchant Approval for Supplements
Category: Compliance, Data Analysis, Digital Marketing, Google Ads, Google Analytics, Market Research, SEO, Website Audit
Budget: ₹75000 - ₹150000 INR
26-Oct-2025
10:57 GMT
One-Year Sustainability Engagement Plan
Category: Business Analysis, Business Writing, Environmental Consulting, Event Planning, Excel, Project Management, Report Writing, Research Writing, Risk Management, Sustainability
Budget: $30 - $250 USD
26-Oct-2025
10:57 GMT
Looking for Active TikTok Creators to Promote My Channels (TikTok + Patreon) Us people
Category: Facebook Marketing, Internet Marketing, Link Building, Marketing, Pinterest, Social Media Marketing, Social Networking, TikTok, Tiktok Ads, Twitter
Budget: €8 - €30 EUR
26-Oct-2025
10:55 GMT
OB-GYN Infographic Content Creation
Category: Adobe Illustrator, Photoshop, Canva, Content Creation, Graphic Design, Illustration, Infographics, Social Media Marketing, Visual Design
Budget: ₹750 - ₹1250 INR
26-Oct-2025
10:54 GMT
Investor Pitch Deck Upgrade
Category: Branding, Corporate Identity, Google Slides, Graphic Design, Market Analysis, Powerpoint, Prezi, Visual Design
Budget: €250 - €750 EUR
26-Oct-2025
10:54 GMT
Browse All Projects
Projects by Skills ...
Projects for 'android'
Projects for 'ajax'
Projects for 'asp'
Projects for 'aspnet'
Projects for 'cms'
Projects for 'cpp'
Projects for 'csharp'
Projects for 'css'
Projects for 'delphi'
Projects for 'design'
Projects for 'drupal'
Projects for 'excel'
Projects for 'facebook'
Projects for 'flash'
Projects for 'html'
Projects for 'java'
Projects for 'javascript'
Projects for 'joomla'
Projects for 'iphone'
Projects for 'mysql'
Projects for 'photoshop'
Projects for 'php'
Projects for 'python'
Projects for 'ruby'
Projects for 'seo'
Projects for 'sql'
Projects for 'sysadm'
Projects for 'translate'
Projects for 'typing'
Projects for 'twitter'
Projects for 'vbnet'
Projects for 'xml'
Projects for 'wordpress'
Projects for 'writing'
Read RSS feeds ... New!
RSS feed for 'android'
RSS feed for 'ajax'
RSS feed for 'asp'
RSS feed for 'aspnet'
RSS feed for 'cms'
RSS feed for 'cpp'
RSS feed for 'csharp'
RSS feed for 'css'
RSS feed for 'delphi'
RSS feed for 'design'
RSS feed for 'drupal'
RSS feed for 'excel'
RSS feed for 'facebook'
RSS feed for 'flash'
RSS feed for 'html'
RSS feed for 'java'
RSS feed for 'javascript'
RSS feed for 'joomla'
RSS feed for 'iphone'
RSS feed for 'mysql'
RSS feed for 'photoshop'
RSS feed for 'php'
RSS feed for 'python'
RSS feed for 'ruby'
RSS feed for 'seo'
RSS feed for 'sql'
RSS feed for 'sysadm'
RSS feed for 'translate'
RSS feed for 'typing'
RSS feed for 'twitter'
RSS feed for 'vbnet'
RSS feed for 'xml'
RSS feed for 'wordpress'
RSS feed for 'writing'
New!
Проекты на русском
(Projects in Russian)

Long URL:
www.1001freelanceprojects.com
Mobile version:
m.1001fp.com
Copyright © 2005-2024 1001 Freelance Projects