Senior Backend Engineer
At a glance
Senior Backend Engineering role at US Mobile. Toronto · full-time · CA$140,000–CA$180,000 base.
techroles summary, based on the employer's posting.
What you'll do
- Design and maintain REST APIs with Java or Python, then build asynchronous service links using RabbitMQ or AWS messaging services
- Model and store application data in MongoDB or other NoSQL systems
- Work with Product, QA and DevOps to ship reliable features that can scale across devices and customers
- Write tested, documented code and take part in architecture decisions, reviews and performance improvements
- Build developer tools and systems that support product quality and continuous uptime
What you bring
- At least seven years working with Java and Spring Boot
- You have built and used REST APIs, and worked hands-on with RabbitMQ or AWS SQS/SNS
- You can work with MongoDB or another NoSQL database and apply Git, CI/CD and agile practices
- You have used Claude or Opencode in backend development, including coding, debugging or improving services
Who this fits
This senior, hands-on engineering role suits someone comfortable shaping system architecture while contributing code and collaborating across teams. The position is hybrid in Toronto.
From the employer
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.
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
- Flexible paid time off
- Gym reimbursement
- Free cell phone service
- Your choice of equipment + Bose QC/Apple Airpod Pro headphones
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Backend Engineering
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