Senior Fullstack Engineer, Scale

Salary: £45,000 - 70,000 per year

Requirements:

• We require 5+ years of software engineering experience in ReactJS and TypeScript.
• We value the ability to choose the right level of abstraction, balancing flexibility and simplicity in system and component design.
• We expect clear communication across technical and non-technical stakeholders.
• We look for pragmatic decision-making on when to optimize for performance versus velocity based on business impact.
• We value experience thriving in cross-functional environments spanning Product, Design, Compliance, and Sales.
• We require the ability to design for scale, maintainability, and production excellence.
• Preferred experience includes fintech, payments, or regulated industries.
• Preferred experience includes high-scale performance tuning, large user bases, and strict latency SLAs.
• Preferred background includes multi-tenant SaaS or platform architecture.
• Preferred proficiency with PostgreSQL, Redis, Kafka, or cloud platforms such as AWS, GCP, or Azure.
• Preferred experience with OAuth2.0, API design, or developer documentation.
• Preferred experience with cross-region deployment or data residency compliance.
• Preferred experience in solutions engineering or customer-facing technical roles.

Responsibilities:

• We build and maintain the multi-tenant infrastructure powering our platform customers.
• We architect systems that aggregate requests from all platform customers while meeting enterprise-grade SLAs for availability, latency, and throughput.
• We handle cross-data-center scenarios.
• We own features that require synthesizing knowledge across business, regulatory, and technical domains.
• We design integrations for enterprise prospects by translating business requirements into technical solutions.
• We make architectural decisions that can influence deal outcomes and support competitive sales.
• We build infrastructure that directly impacts how people use financial services.
• We develop expertise beyond technical skills, including customer business models, regulatory landscapes, and enterprise sales influence.
• We work with engineers, product thinkers, and designers across the globe.

Technologies:

• API
• AWS
• Architect
• Azure
• Cloud
• Embedded
• GCP
• Support
• Kafka
• PostgreSQL
• Redis
• TypeScript
• AI
• DevOps
• Salesforce
• Fullstack

More:

We are Airwallex, the only unified payments and financial platform for global businesses. Founded in Melbourne, we support more than 250,000 businesses worldwide with integrated solutions for business accounts, payments, spend management, treasury, and embedded finance. We have a team of over 2,300 people across 27 offices globally and are backed by leading investors, with a valuation of US$11 billion. This is a full-time Engineering role on our Scale Platform team in London, working in a hybrid mode. The total compensation is listed as 140,000 to 200,000 GBP, and the compensation range is listed as 74,822 to 138,955 plus bonus and RSU.

last updated 36 week of 2026