Senior Software Engineer, Scale

Airwallex5 days ago

Location

UK - London

Type

Full Time

Salary

GBP 80,000 – 120,000

Level

Senior

Role

Senior Software Engineer

Posted

Mar 9, 2026

Full TimeSenior

The role

Summary

Senior Software Engineer role at Airwallex's Scale team, focused on building embedded finance platform infrastructure for enterprise clients. The position involves architecting multi-tenant systems, designing cross-domain product features, and creating solutions for enterprise prospects while working with high-scale financial technology systems.

What you'll do

Embedded Finance Platform Development: Build and maintain multi-tenant infrastructure powering enterprise clients like Rippling, Navan, Qantas, and SHEIN with enterprise-grade SLAs

Cross-Domain Product Features: Own complex features spanning business, regulatory, and technical domains including tax systems, compliance flows, and monetization tools

Solutions Architecture: Design technical integrations for enterprise prospects by translating business requirements into scalable technical solutions

High-Scale System Design: Architect systems handling 100k+ QPS with strict latency requirements and cross-data-center scenarios

Cross-Functional Collaboration: Work closely with Product, Design, Compliance, and Sales teams to deliver integrated solutions

Performance Optimization: Make strategic decisions on performance vs velocity trade-offs based on business impact and technical constraints

What we look for

Technical

Java/Spring Boot Expertise5+ years of hands-on experience building enterprise applications with Java and Spring Boot framework

System Design SkillsAbility to balance flexibility and simplicity in system architecture and component design

High-Scale PerformanceExperience with systems handling 100k+ QPS, large user bases, and strict latency SLAs

Multi-tenant ArchitectureUnderstanding of SaaS platform architecture patterns and multi-tenancy design principles

Education

Bachelor's DegreeBachelor's degree in Computer Science, Software Engineering, or equivalent practical experience

Experience

Software EngineeringMinimum 5 years of professional software development experience in enterprise environments

Cross-Functional CollaborationProven track record working with Product, Design, Compliance, and Sales teams

Production SystemsExperience designing for scale, maintainability, and production excellence

Skills

Required skills

Java Programming5+ years of professional Java development experience

Spring Boot FrameworkDeep understanding of Spring ecosystem and microservices architecture

System ArchitectureAbility to design scalable, maintainable systems with appropriate abstraction levels

Cross-Functional CommunicationClear communication skills across technical and non-technical stakeholders

Production System DesignExperience with scale, maintainability, and production excellence principles

Nice to have

Fintech ExperienceBackground in financial technology, payments, or regulated industry environments

PostgreSQLAdvanced database design and optimization skills

RedisExperience with caching strategies and in-memory data stores

Apache KafkaEvent streaming and real-time data processing capabilities

Cloud PlatformsProficiency with AWS, GCP, or Azure for scalable infrastructure

OAuth2.0Authentication and authorization implementation experience

API DesignRESTful API design and developer documentation skills

Cross-Region DeploymentMulti-region architecture and data residency compliance experience

Compensation & benefits

Salary

GBP 80,000 – 120,000 (annual)

Stock options

Available

Benefits

Equity Participation

Stock options in a US$8 billion valued fintech unicorn with potential for significant growth

Global Career Growth

Opportunities to work across 26 offices worldwide and develop international expertise

Professional Development

Exposure to enterprise sales, regulatory landscapes, and technical leadership opportunities

Cutting-Edge Technology

Work with latest fintech infrastructure serving 200,000+ global businesses

Equal Opportunity Employment

Inclusive workplace valuing diversity across all backgrounds and identities

Disability Accommodation

Support and accommodations for employees with disabilities or special needs

Interview process

1
Application Review — Initial screening of resume, portfolio, and GitHub contributions focusing on Java/Spring Boot experience
2
Technical Phone Screen — 45-60 minute technical discussion covering system design principles, Java fundamentals, and fintech domain knowledge
3
System Design Interview — Architecture discussion focusing on multi-tenant systems, high-scale performance, and cross-domain integrations
4
Coding Assessment — Live coding session or take-home project demonstrating Spring Boot proficiency and clean code practices
5
Cross-Functional Interview — Behavioral interview with Product/Sales stakeholders assessing communication skills and business acumen
6
Final Technical Round — Deep dive with senior engineers on complex scenarios, performance optimization, and production system design
7
Cultural Fit Interview — Discussion of Airwallex values, operating principles, and career growth aspirations