Staff Backend Engineer, Stablecoin Platform

AIRWALLEX (SINGAPORE) PTE. LTD.; Singapore; On-site; SGD 120,000 - 180,000; Full time

Job summary

Airwallex is expanding its stablecoin infrastructure in Singapore. We’re seeking a skilled engineer to architect and build secure, scalable systems that handle key management, transaction signing, and blockchain integration within our FX and payments platform.

You will own services across mint, burn, transfer, and reconciliation, develop internal ledgers across multiple chains, and collaborate with product, infra, and compliance teams to deliver auditable, reliable services.

Qualifications

• 5+ years of experience in object-oriented design and production-grade software development.
• Strong experience with at least one strongly typed language (Kotlin, Java, C#, C++, Rust).
• Proven experience building and integrating blockchain infrastructure into financial systems.
• Secure system design with focus on private key handling, signing and encryption.
• Able to adapt to new tools and changing priorities.
• Excellent cross-team communication.

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 for mint, burn, transfer, and reconciliation of stablecoins.
• Build internal ledgering systems tracking balances across chains and tokens.
• Integrate stablecoin infra into Airwallex FX and payment systems.
• Write, review, and ship production code.
• Collaborate with product, infra, and compliance teams for auditable services.

Skills

OOP design

Production-grade software

Typed languages

Kotlin/Java/C/C++/Rust

Blockchain integration

Key management

Security design

Communication

Python basics

Job description

About the team
The Financial Markets team is responsible for Airwallex’s core FX and liquidity infrastructure. We’re now expanding into building the stablecoin infrastructure that will enable both customers and internal systems to buy, hold, send, and settle with tokenised currency globally. This includes support for near-instant global payments, on-chain liquidity, and seamless conversion between fiat and stablecoin balances. We’re building stablecoins into the core of Airwallex’s infrastructure, so they function as seamlessly as any fiat currency across our global platform.

We’re seeking a skilled developer to take a leading role in advancing our initiatives. Someone who can both architect and build robust, reliable systems and tackle the challenges of blockchain integration, digital asset custody, and global payments infrastructure.

What You’ll Do

• 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

Responsibilities

Minimum qualifications:

• A highly experienced engineer (5+ years) with deep expertise in object-oriented design and production-grade software development, including at least one strongly typed language (e.g. Kotlin, Java, C#, C++, Rust); Python experience is useful but not sufficient on its own

• Proven experience building and integrating blockchain infrastructure (wallets, transaction flows, key management, etc.) into larger financial systems

• Experienced in integrating new systems into legacy or distributed environments without introducing instability or regressions.

• Strong grasp of secure system design, particularly around private key handling, signing, encryption, and operational controls

• Able to quickly pick up unfamiliar tools or frameworks when needed and adjust to changing technical priorities.

• Clear communicator who works well across engineering, product, and non-technical teams

Preferred qualifications:

• Experience in FX, payments, or financial infrastructure is useful but not required