xAI

xAI

Posted via Greenhouse

Software Engineer - X Money

Posted Aug 5, 2026

Role at a glance

Salary
Not Disclosed
Location
United Kingdom - England - London
Work arrangement
On-site
Employment
Full-time
Experience
2+ years of experience working on large scale consumer applications.

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Role Summary

AI-generated

The Software Engineer will join the X Money team to build a global payment network and high-scale financial products platform. The role focuses on backend development while supporting full-stack efforts and collaborating on payments, fraud detection, and compliance initiatives.

What You'll Do

  • Develop backend services, APIs, and data models for high-volume, multi-user environments.
  • Work with iOS, Android, and web client engineers to ship products.
  • Design infrastructure and microservices for payments, transactions, growth, monetization, and engagement.
  • Build and maintain full-stack features including dashboards, personalized experiences, content delivery, interactive tools, assessments,...
  • Lead architecture, scalability, and reliability decisions for high-concurrency, low-latency systems.
  • Perform testing, monitoring, deployment, and secure data handling.

Generated from the employer's posting. Verify important details before applying.

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Qualifications

Proficiency in distributed systems for high-scale, low-latency environments; languages like Rust, Go, Python & Java, and high volume streaming systems.

Required

  • Proficiency in distributed systems for high-scale, low-latency environments
  • Rust, Go, Python, or Java
  • High volume streaming systems
  • 2+ years of experience working on large scale consumer applications

Preferred

  • 5+ years of experience working on large scale consumer applications
  • Early-mid stage startup experience as a founding engineer
  • Rapid prototyping
  • User-centric design
  • AI solutions

Original job description

Content provided by the employer
View on company site

SpaceXAI’s mission is to create AI systems that can accurately understand the universe and aid humanity in its pursuit of knowledge. Our team is small, highly motivated, and focused on engineering excellence. This organization is for individuals who appreciate challenging themselves and thrive on curiosity. We operate with a flat organizational structure. All employees are expected to be hands-on and to contribute directly to the company’s mission. Leadership is given to those who show initiative and consistently deliver excellence. Work ethic and strong prioritization skills are important. All employees are expected to have strong communication skills. They should be able to concisely and accurately share knowledge with their teammates.

ABOUT THE ROLE:

We are seeking a talented Software Engineer to join our X Money team, focused on building a revolutionary global payment network that will serve over 600 million users and rival the world’s largest financial institutions. In this role, you will specialize in backend development, designing and optimizing robust microservices to ensure scalability, security, and reliability. You will support full-stack efforts, collaborate with cross-functional teams on payments, fraud detection, and compliance initiatives, and contribute to the creation of a high-scale financial products platform. This is an opportunity to work on greenfield projects in a fast-paced, startup-like environment, driving innovation at the intersection of AI and finance.

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.

BASIC QUALIFICATIONS:

  • Proficiency in distributed systems for high-scale, low-latency environments; languages like Rust, Go, Python & Java, and high volume streaming systems.
  • 2+ years of experience working on large scale consumer applications.

PREFERRED SKILLS AND EXPERIENCE:

  • 5+ years of experience working on large scale consumer applications or early-mid stage startup experience as a founding engineer, emphasizing rapid prototyping, user-centric design, and AI solutions.

COMPENSATION AND BENEFITS:

£107,000 - £262,000 GBP

Base salary is just one part of our total rewards package at SpaceXAI, which also includes equity, comprehensive healthcare and dental coverage, cash plan, income protection, life insurance, and various other discounts and perks.

SpaceXAI is an equal opportunity employer. For details on data processing, view our Recruitment Privacy Notice.

xAI

About the company

xAI

Large Enterprise

xAI is a cutting-edge technology company focused on developing advanced artificial intelligence solutions to enhance human capabilities and optimize decision-making processes. Founded by a team of leading experts in AI and machine learning, xAI aims to address complex challenges across various industries, including healthcare, finance, and transportation. By prioritizing ethical AI development, the company is committed to creating innovative tools that empower organizations to harness the full potential of artificial intelligence while ensuring transparency and accountability.

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