Senior Backend Engineer – Payments, AI & High-Scale Systems

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

Benefits offered by this job

Equity

Healthcare

Dental coverage

Cash plan

Income protection

Life insurance

Discounts and perks

Job summary

SpaceXSI is seeking a Sr. Software Engineer for the X Money team to build a global payments platform serving hundreds of millions of users. You will design scalable backend services and contribute across payments, fraud, and compliance initiatives in a fast-paced, startup-like environment.

You will collaborate with iOS, Android and web engineers, lead architecture decisions, and ensure reliability and security across high-concurrency systems while delivering high-impact financial products.

Qualifications

• 5+ years of experience working on large-scale consumer applications or as a founding engineer in startups.
• Experience with high-volume streaming systems is preferred.
• Distributed systems experience for high-scale, low-latency environments.
• Proficiency in Rust, Go, Python or Java.

Responsibilities

• Develop backend services, APIs, and data models for high-volume multi-user environments.
• Collaborate 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 dashboards, content delivery, interactive tools, 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.

Skills

Large-scale apps

Founding engineer

AI solutions

Rust

Go

Python

Java

Job description

SpaceXSI is seeking a Sr. Software Engineer for the X Money team to build a global payments platform serving hundreds of millions of users. You will design scalable backend services and contribute across payments, fraud, and compliance initiatives in a fast-paced, startup-like environment.

You will collaborate with iOS, Android and web engineers, lead architecture decisions, and ensure reliability and security across high-concurrency systems while delivering high-impact financial products.