Senior Backend Architect, Stablecoin Infrastructure

Airwallex; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

Airwallex is seeking a senior engineer to lead the development of our stablecoin infrastructure and blockchain integration within a global payments platform. You will architect and build secure systems for key management, transaction signing, and cross-chain settlement, shaping the next generation of tokenised currency for our FX and payments stack.

You will collaborate with product, infra, and compliance teams to deliver auditable, production-grade services while ensuring safe handling of

Qualifications

• 5+ years as engineer with OO design and production-grade software.
• Experience building and integrating blockchain infrastructure into financial systems.
• Experience integrating new systems into legacy or distributed environments without instability.
• Strong knowledge of private key handling, signing, encryption, and operational controls.
• Clear communicator across engineering, product, and non-technical teams.

Responsibilities

• Be part of a high-impact engineering team building stablecoin infrastructure from the ground up.
• Design and implement secure systems for key management, transaction signing, gas fee management, and blockchain integration
• Own services that manage the full lifecycle of stablecoin transactions mint, burn, transfer, reconciliation
• Build internal ledgering systems that track balances across multiple chains and token types
• Integrate stablecoin infrastructure into Airwallex’s existing FX and payment systems, enabling seamless conversion between any supported currency and stablecoins
• Write, review, and ship production code
• Collaborate with product, infrastructure, and compliance teams to deliver reliable and auditable services

Skills

5+ years engineering experience

Object-oriented design

Strongly typed languages (Kotlin/Java/

Blockchain infrastructure experience

Secure system design

Cross-team collaboration

Tools

Kotlin

Java

C#

C++

Rust

Job description

Airwallex is seeking a senior engineer to lead the development of our stablecoin infrastructure and blockchain integration within a global payments platform. You will architect and build secure systems for key management, transaction signing, and cross-chain settlement, shaping the next generation of tokenised currency for our FX and payments stack.

You will collaborate with product, infra, and compliance teams to deliver auditable, production-grade services while ensuring safe handling of