Senior Backend Engineer - Global Payments & AI Platform

SpaceXSI; Greater London; On-site; GBP 107,000 - 262,000; Full time

Benefits offered by this job

Equity

Healthcare + Dental

Cash plan

Income protection

Life insurance

Perks and discounts

Job summary

SpaceXSI is seeking a talented Software Engineer to join our X Money team, focusing on building a revolutionary global payment network for hundreds of millions of users. You will specialize in backend development, designing robust microservices for scalability, security, and reliability.

You will collaborate with cross-functional teams on payments, fraud detection, and compliance, supporting full-stack efforts and contributing to a high-scale financial products platform in a fast-paced,

Qualifications

• 2+ years of experience working on large-scale consumer applications.
• Experience with distributed systems for high-scale, low-latency environments.
• Experience with Rust, Go, Python, or Java.
• 5+ years of experience working on large scale consumer applications or early-mid stage startup experience as a founding engineer.
• Experience with high-volume streaming systems.

Responsibilities

• Develop backend services, APIs, and data models to support high-volume, multi-user environments.
• Work with iOS, Android & Web client engineers to ship products.
• Design robust infrastructure and microservices for payments, transactions, growth, monetization, and engagement across platforms.
• Build and maintain fullstack features, including user dashboards, personalized experiences, content delivery, interactive tools, assessments, and real-time analytics.
• Lead architecture, scalability, and reliability decisions for high-concurrency, low-latency systems.
• Uphold engineering excellence via testing, monitoring, deployment, and secure data handling.

Tools

Rust

Go

Python

Java

Distributed systems

Job description

SpaceXSI is seeking a talented Software Engineer to join our X Money team, focusing on building a revolutionary global payment network for hundreds of millions of users. You will specialize in backend development, designing robust microservices for scalability, security, and reliability.

You will collaborate with cross-functional teams on payments, fraud detection, and compliance, supporting full-stack efforts and contributing to a high-scale financial products platform in a fast-paced,