Senior Backend Engineer

US Mobile is on a mission to revolutionize connectivity. Imagine a world where you can go into a single app and buy terabytes of data for every one of your devices: phone, smart devices, car, home broadband, and more. That’s the future that US Mobile is building: a software platform built truly for the 21st century and the age of 5G and IoT, with world class engineering, best-in-class user experience, and features that will define the next generation of connectivity. 

At the core of it all, we have a team and culture that has been recognized by Forbes as one of the top 500 best startup employers in the US. Our team spans diverse backgrounds, cultures, and stories, with employees coming from 20+ countries.

We're a venture-backed company entering hypergrowth, having recently ranked 94th on Inc 5000's fastest-growing private companies in America, and we’re looking for someone exceptional to join our team.

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.

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:

• 7+ 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 through Aetna (Medical, Dental, Vision)


• Flexible paid time off 


• Gym reimbursement (up to $100 a month)


• Commuter reimbursement (MTA, Metro North, etc..)


• Free cell phone servic


• Your choice of equipment + Bose QC/Apple Airpod Pro headphones


• 401k

$140,000 - $180,000 a year

Think you're a good fit? Apply to learn more!

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.