Principal Backend Engineer

US Mobile is building the future of wireless communication. The goal: one unified network open to any person and any device, worldwide. Connection without walls. We’re getting there by empowering customers. All three major networks on one phone and one plan, plus home internet from Starlink. No lock-in. No commitments. Custom fit plans at every price point. 24/7 customer support with real people, empowered to help. We get real-time feedback from Reddit, surveys, and customer support informing product roadmaps and everything we do. It’s working — Consumer Reports named us the top-rated mobile carrier two years in a row.* And we’re building innovative systems that scale. A network agnostic tech stack. Agile, cross-functional teams built on trust and mutual respect. This work isn’t for everyone. If you work fast, flexibly, and collaboratively — without compromising standards — we want to hear from you. We're looking for an exceptional backend engineer and hands-on architect to help us scale and connect millions of devices to wireless networks. The projects and potential impact are incredible. We're looking for talented, ambitious, and entrepreneurial team members who are excited to tackle these challenges. \n You will: Architect optimal solutions to our business problems Deploy exciting new features Help us scale to scale to 10’s of millions of customers & connected devices Build quality tools and frameworks to ensure a high-quality product Build systems to ensure continuous uptime Responsibilities: Develop and maintain RESTful APIs using Java (Spring Boot or related web frameworks) or Python (Flask, Django) Design and implement asynchronous service communication using RabbitMQ or AWS SQS/SNS Work with NoSQL databases like MongoDB for data modeling and storage Collaborate with Product, QA, and DevOps teams to deliver reliable and scalable features Write clean, testable, and well-documented code with unit and integration tests Participate in system architecture design, code reviews, and performance tuning Qualifications: 10+ years of experience with Java and Spring Boot Strong experience with building and consuming REST APIs Hands-on experience with message brokers such as RabbitMQ or AWS SQS/SNS Familiarity with MongoDB or other NoSQL database technologies Experience integrating and leveraging AI-assisted development tools such as Claude and Opencode to accelerate backend development, including code generation, debugging, and optimization of APIs and services. Demonstrated ability to incorporate AI tools into the software development lifecycle, using Claude or Opencode for tasks like automated code reviews, documentation generation, and improving system design efficiency. Solid understanding of Git, CI/CD workflows, and agile development practices Excellent debugging, problem-solving, and communication skills Excellent problem-solving and debugging skills Strong communication and team collaboration skills Benefits: Health care coverage Flexible paid time off Gym reimbursement Free cell phone service Your choice of equipment + Bose QC/Apple Airpod Pro headphones \n $160,000 - $220,000 a year \n Think you're a good fit? Apply to learn more!

You will architect optimal solutions and deploy new features to help scale the platform to millions of customers. You will also collaborate with cross-functional teams to build reliable, scalable systems and maintain high-quality code through testing and reviews.

The role requires 10+ years of experience with Java and Spring Boot, along with strong expertise in REST APIs and message brokers. Candidates must also demonstrate proficiency in NoSQL databases and the ability to integrate AI-assisted development tools into the software lifecycle.

• Health care coverage • Flexible paid time off • Gym reimbursement • Free cell phone service • Choice of equipment • Bose QC headphones • Apple Airpod Pro headphones

• CI/CDPreferred
• Problem solvingPreferred
• AgilePreferred
• MongoDBPreferred
• JavaPreferred
• Spring BootPreferred
• GitPreferred
• PythonPreferred

Identified from the job description. Confirm important requirements above.

• Java
• Spring Boot
• Python
• RESTful APIs
• RabbitMQ
• AWS SQS
• AWS SNS
• NoSQL
• MongoDB
• Git
• CI/CD
• Agile
• System architecture
• Debugging
• Problem-solving
• AI-assisted development
• Business Problems
• Flask (Web Framework)
• Back End (Software Engineering)
• Customer Empowerment
• Product Roadmaps
• Workflow Management
• Time Off Management
• Git (Version Control System)
• Java (Programming Language)
• Application Programming Interface (API)
• Agile Methodology
• Artificial Intelligence
• Amazon Web Services
• Customer Support
• Code Generation
• Code Review
• Communication
• Connected Devices
• Data Modeling
• Software Development Life Cycle
• DevOps
• Programming Tools
• Django (Web Framework)
• Scalability
• Innovation
• Problem Solving
• Spring Framework
• Python (Programming Language)
• Performance Tuning
• RESTful API
• Systems Architecture
• Systems Design
• Testability
• Wireless Networks

• Technology
• Software
• Engineering
• Data & Analytics
• Back End Engineer
• Back End Developer / Engineer
• Web and Multimedia Developers
• Web Developers

Minimum experience

10+ years

Posting language

English

Working hours

40 hours per week