Senior Backend Engineer, Stablecoin Platform

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

Job summary

Airwallex (Singapore) PTE. LTD. is expanding its Financial Markets team to build stablecoin infrastructure and on-chain payments. This role leads architecture and development of secure key management, signing, and cross-chain ledgering across multiple chains and token types.

You'll collaborate with product, infrastructure, and compliance to deliver auditable services and integrate stablecoin workflows with existing FX and payment systems for seamless fiat-stablecoin conversions.

Qualifications

• 5+ years of experience in object-oriented design and production-grade software development.
• Strong experience with at least one strongly typed language (e.g. Kotlin, Java, C#, C++, Rust).
• Proven experience building and integrating blockchain infrastructure into financial systems.
• Experience integrating new systems into legacy or distributed environments with minimal disruption.
• Solid understanding of secure key handling, signing, encryption, and operational controls.
• Able to quickly learn new tools/frameworks and adapt to changing priorities.

Responsibilities

• Be part of a high-impact team building stablecoin infrastructure from the ground up.
• Design and implement secure systems for key management, transaction signing, gas management, and blockchain integration.
• Own services that manage mint, burn, transfer, and reconciliation of stablecoin transactions.
• Build internal ledgers tracking balances across chains and token types.
• Integrate stablecoin infra with Airwallex’s FX and payment systems for seamless fiat-stablecoin conversions.
• Write, review, and ship production code.
• Collaborate with product, infra, and compliance teams to deliver auditable services.

Skills

OOP design

Typed languages

Blockchain integration

Secure system design

Cross-functional communication

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