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.
Flat Indonesian Food Logo Design Category: Adobe Illustrator, Photoshop, Branding, Graphic Design, Illustration, Logo Design, Vector Design Budget: $10 - $30 USD
13-Jan-2026 05:04 GMT
Mobile Tycoon Game Design Category: Game Art, Game Design, Game Testing, Game UI, IPhone, Mobile App Development, Unity, Unity 3D Budget: $250 - $750 USD
13-Jan-2026 05:03 GMT
Sales Copy & Logo Package -- 2 Category: Branding, Content Writing, Copywriting, Graphic Design, Illustration, Logo Design, Photoshop, Social Media Marketing Budget: $250 - $750 USD
13-Jan-2026 05:03 GMT
AI-Driven Meta Ads Conversion Boost Category: Advertising, AI Design, AI Development, AI Graphic Design, AI Image Editing, AI Generated Art, Digital Marketing, Facebook Marketing, Google Adwords, Internet Marketing Budget: $30 - $250 CAD
13-Jan-2026 05:02 GMT
Architectural Walkthrough Video Editing Category: Adobe Premiere Pro, After Effects, Color Grading, Final Cut Pro, Video Editing, Video Post Editing, Video Production, Video Services Budget: ₹12500 - ₹37500 INR
13-Jan-2026 05:01 GMT
Professional YouTube Description Writer Category: Article Writing, Content Creation, Ghostwriting, SEO Writing, Video Editing, Video Production Budget: ₹600 - ₹1500 INR
Honda Acty Tie Rod CAD Model Category: 3D CAD, 3D Modelling, 3D Printing, 3D Rendering, AutoCAD, CAD / CAM, Reverse Engineering, Solidworks Budget: $30 - $250 USD
13-Jan-2026 04:58 GMT
Edit 4-Hour Video with Subtitles Category: Adobe Premiere Pro, After Effects, Audio Editing, DaVinci Resolve, Final Cut Pro, Subtitles & Captions, Video Editing, Video Post Editing, Video Production, Video Services Budget: ₹1500 - ₹12500 INR
13-Jan-2026 04:56 GMT
WhatsApp Chat Reply Support - 12/01/2026 23:42 EST Category: Chat Operation, Chatbot Integration, Customer Experience, Customer Service, Customer Support, Indonesian Translator, Social Media Management, Time Management Budget: $15 - $25 USD
