Senior Fullstack Engineer (Fintech)

TL;DR

Senior Fullstack Engineer (Fintech): Building and maintaining multi-tenant infrastructure for a global payments platform with an accent on system architecture, scalability, and enterprise-grade performance. Focus on designing complex cross-domain product features, optimizing high-load services, and collaborating across technical and business teams to drive financial solutions.

Location: Must be based in London (Hybrid Mode)

Compensation: £74,822 – £138,955 + bonus + RSU

Company

Airwallex is a unified global payments and financial platform empowering businesses with integrated solutions for accounts, payments, and treasury management.

What you will do

• Architect and build multi-tenant infrastructure powering enterprise-grade financial services.
• Design and own cross-domain product features including tax systems and compliance-driven flows.
• Translate complex business requirements into technical solutions for enterprise prospects.
• Ensure system availability, latency, and throughput meet strict enterprise-grade SLAs.
• Collaborate with product, design, compliance, and sales teams to deliver end-to-end features.
• Utilize AI tools to accelerate development and solve complex technical challenges.

Requirements

• 5+ years of software engineering experience in ReactJS and TypeScript.
• Strong background in system and component design with a focus on abstraction and simplicity.
• Ability to make pragmatic decisions balancing performance and development velocity.
• Experience designing for scale, maintainability, and production excellence.
• Excellent communication skills for both technical and non-technical stakeholders.
• Must be based in London and able to work in a hybrid environment.

Nice to have

• Experience in fintech, payments, or regulated industries.
• Background in high-scale performance tuning (100k+ QPS).
• Proficiency with PostgreSQL, Redis, Kafka, or cloud platforms (AWS/GCP/Azure).
• Experience with OAuth2.0, API design, or cross-region deployment.

Culture & Benefits

• Work on high-visibility products used by global companies like Rippling and SHEIN.
• Opportunity to develop expertise in business models, regulatory landscapes, and enterprise sales.
• Collaborative environment with a focus on founder-like energy and ownership.
• Supportive team culture with a focus on accelerated learning and career growth.