Senior Backend Engineer: Scale & Architect High-Impact APIs

US Mobile; York and North Yorkshire; On-site; GBP 85,000 - 125,000; Full time

Benefits offered by this job

Gym reimbursement

Free cellular service on US network

Free lunch in NYC office

Metrocard reimbursement

Flexible working hours

Job summary

US Mobile is seeking a backend engineer and hands-on architect to scale and connect millions of devices to wireless networks in York, UK. You will design backend services, deploy new features, and ensure high uptime across distributed systems.

You will work with Java and Spring Boot or Python, build REST APIs, and integrate AI-assisted tooling to streamline development. Collaboration with Product, QA, and DevOps is essential to success.

Qualifications

• 7+ years of experience with Java and Spring Boot.
• Hands-on experience with message brokers such as RabbitMQ or AWS SQS/SNS.
• Solid understanding of Git, CI/CD workflows, and agile development practices.
• Experience building and consuming REST APIs.
• Experience with NoSQL databases like MongoDB.
• Familiarity with AI-assisted development tools (Claude or Opencode).
• Excellent problem-solving, debugging, and communication skills.

Responsibilities

• Develop backend systems and services to scale to millions of devices.
• Architect optimal solutions to business problems and deploy new features.
• Design asynchronous service communication using RabbitMQ or AWS SQS/SNS.
• Collaborate with Product, QA, and DevOps teams to deliver scalable features.
• Write clean, well-documented code with unit and integration tests.
• Participate in system architecture design, code reviews, and performance tuning.

Skills

Java

Spring Boot

Python

RabbitMQ

AWS SQS/SNS

REST APIs

NoSQL

MongoDB

Git

CI/CD

Agile

AI-assisted tools

Code reviews

Performance tuning

Tools

RabbitMQ

AWS SQS/SNS

MongoDB

Git

CI/CD

Spring Boot

Django

Flask

Job description

US Mobile is seeking a backend engineer and hands-on architect to scale and connect millions of devices to wireless networks in York, UK. You will design backend services, deploy new features, and ensure high uptime across distributed systems.

You will work with Java and Spring Boot or Python, build REST APIs, and integrate AI-assisted tooling to streamline development. Collaboration with Product, QA, and DevOps is essential to success.