Blockchain Engineer for On/Off-ramp Crypto Rails

@irsolutions

With over a decade of experience in blockchain engineering and high-scale systems, I understand your goal of creating a seamless B2B payments rail for African businesses to transition between crypto and local fiat. My background in scaling projects for over 1 million users and developing high-security FinTech solutions directly applies to the complexity of implementing a multi-chain wallet layer covering BTC, ETH, SOL, and stable-coins like USDT/USDC. A strategic insight for ensuring scalability and security in this project is to leverage MPC architecture with enhanced security features like two-factor authentication and biometric verification. I have successfully built and scaled Telegram Mini Apps serving over 1 million users, demonstrating my ability to handle high complexity. I encourage you to take action and reach out to discuss the roadmap for this project further. Let's collaborate on kicking off this 6-month full-time engagement to bring your vision to life efficiently and securely.

@vladang

The hard part here isn’t just signing BTC, ETH, SOL, and stablecoin transactions — it’s keeping settlement predictable when liquidity, mobile-money rails, and on-chain confirmation times all behave differently under load. The wallet layer has to feel unified even when the infrastructure underneath isn’t. I’d structure this as isolated chain services with a shared MPC signing layer, then expose balances, transfers, and webhook events through a single API surface. For the fiat bridge, I’d add route-failover logic between liquidity and payout providers so SLA targets stay stable during congestion or bank downtime. High-value transaction flows can trigger adaptive biometric checks without slowing normal transfers. I’ve built backend-heavy financial systems in Python/PHP and SaaS API platforms in Vue/Nuxt/Express where reliability and transaction consistency were critical. I can start immediately and focus on getting staging infrastructure production-safe first. Q1: Which MPC provider or custody model are you planning to use? Q2: Are African payout rails already selected, or part of this engagement? Q3: Will wallet addresses be custodial, non-custodial, or hybrid per business account?

@AsimJaved706

My name is Asim, an AI & Automation Specialist with a long-standing reputation for delivering exceptional results. While I may not have direct experience in Blockchain, the skills I bring to the table -- JavaScript and Software Architecture -- can be leveraged significantly in this project. Having successfully automated processes for numerous clients, I'm more than capable of creating the wallet infrastructure and fine-tuning it for this project's unique needs. In addition to my diverse technical skillset, my core strengths include diligent problem-solving and passion for cutting-edge technology. These traits perfectly align with your mandate of building a secure cross-chain transaction system and the seamless crypto ↔ fiat on/off-ramp engine. You need a partner who can truly understand the significance of quick and accurate financial transactions in Africa, and that's precisely what you'd get by collaborating with me. My experience in launching high-performance web platforms, integrating payment gateways, and my AI-first mindset will guarantee your project stability at every level while addressing compliance regulations specific to the African market. So if you're ready to save time, cut costs and take your B2B payments rail to new heights, let’s talk about kicking this off for a 6-month full-time engagement starting immediately.