# Senior Software Engineer \(Web3 Payments\) - Company: [Hyphenconnect]() - Location: Taipei - Team: Engineering - Posted: January 16, 2026 ## Job description We are supporting an APAC-focused technology company building a non-custodial, protocol-level payment infrastructure that enables seamless on-chain settlement for API-based services. The project sits at the intersection of Web3 payments, cryptographic verification, and high-reliability backend systems, with a strong emphasis on security, low latency, and production-grade operations. This is a greenfield build where senior engineers will help define architecture, security models, and operational standards from day one. As a Senior Software Engineer, you will take ownership of core backend services that verify cryptographically signed payment requests and coordinate on-chain settlement across multiple blockchain networks. You will work closely with security, compliance, and product stakeholders, and play a key role in shaping system design, reliability practices, and developer experience. **Responsibilities** * Design and implement high-performance backend APIs for payment verification and settlement * Build cryptographic verification logic (signature validation, replay protection, idempotency) * Integrate with blockchain RPC providers and design confirmation, retry, and failover strategies * Architect secure key-management solutions (KMS/HSM), audit logging, and least-privilege access * Develop chain adapters for EVM and non-EVM networks, starting with stablecoin transfers * Own production readiness: SLOs, monitoring, alerting, and incident response workflows * Write technical documentation, threat models, and operational runbooks * Mentor junior engineers and contribute to engineering standards and best practices **Qualifications** * 5–8+ years of backend engineering experience, ideally in TypeScript/Node and/or Rust * Strong understanding of cryptographic signatures, structured payloads, and API security * Hands-on experience with EVM transaction lifecycle (nonce, gas, finality) and/or Solana * Proven track record building production-grade distributed systems * Experience with CI/CD, containerised deployments, and observability tooling * Excellent written communication skills (design docs, threat models, runbooks) **Strongly Preferred** * Experience with payment or settlement systems (idempotency, retries, reconciliation) * Familiarity with stablecoin transfer patterns (e.g. USDC on EVM chains) * Background in non-custodial architectures or security-sensitive systems * Exposure to protocol-level payment flows, API monetisation, or metered billing ## Apply [Apply on Hyphenconnect]() Canonical job page: