Web3 Payment Integration Engineer

Awaj Dubai, a firm active in construction and property development, is looking for a Web3 Payment Integration Engineer to embed a stable‑coin checkout into its online portal. The aim is to replace costly traditional banking charges and give clients worldwide a frictionless way to pay for building and real‑estate services. The contractor will be tasked with creating a crypto‑payment flow centred on USDT and USDC, completing the build within a strict thirty‑day window. Core duties include generating invoices, routing transactions correctly, and tying the checkout to internal accounting through webhook calls. A thorough security audit is required, with attention to eliminating vulnerable endpoints and managing special cases such as shortfalls, excess payments, or transactions that become stuck. Applicants must be an independent professional with a minimum of three years delivering production‑grade Web3 payment solutions. Proficiency in either Web3.js or Ethers.js is essential, together with solid experience using REST APIs and WebSocket connections. In‑depth knowledge of ERC‑20, TRC‑20 and Polygon network specifications, gas‑fee dynamics and confirmation mechanisms is also mandatory. The position is fully remote and operates under a direct B2B agreement, removing corporate layers. Compensation consists of a fixed $25,000 fee for the initial launch, followed by $7,000 per month for two months of post‑deployment support. Candidates should be ready to meet the one‑month deadline and provide examples of comparable projects, highlighting the technology stack they prefer for this type of integration.