Sr. Backend Engineer (Remote)

Who We Are (Mode Mobile)

Mode Mobile is the creator of EarnOS, a transformational software that turns ordinary smartphones into "EarnPhones." This innovation empowers users globally to monetize everyday mobile activities such as streaming, gaming, shopping, etc. We enable users to profit from their data and attention rather than letting only tech giants benefit. Our inclusive approach sets us apart - converting users into earners and facilitating over $150M in earnings and savings while going a step further and turning earners into owners by awarding stock ownership in Mobile Mobile based on their usage. We have attracted over 40 million users across 170 countries.  

​​Mode Mobile is proud to stand as the #1 Fastest-Growing North American Software Company recognized in Deloitte's 2023 Technology Fast 500 and ranked #2 across all sectors.

For additional insights, check out the information about our reward-based super app, Mode Earn App, which also powers the reward engine behind our proprietary smartphone, Mode Earn Phone.

Our Team and Culture Drive Our Success

Our team is the heart of our culture.  We value innovation, collaboration, and curiosity, with a passion for getting things done.  We strive to hire and cultivate the best team members and foster a culture of open communication and transparency.  We are driven and hard-working but also committed to having fun along the way.  We allow OKRs to guide us, assume positive intent, sometimes agree to disagree and commit, honor our commitments, seek to accomplish more with less, and encourage everyone to speak up as our team owns our company’s success.

You can read more about our team and how we work here.

The Role

We’re looking for an exceptional Sr. Backend Engineer to help build, scale, and evolve the backend systems powering the Mode Earn App. You’ll architect reliable services, increase speed and resilience, optimize infrastructure, and unlock new features that help users achieve goals and earn points more effectively.

This is a hands-on, high-impact role ideal for someone who loves solving complex systems problems, building scalable APIs, and shipping features that directly impact product performance and user experience.

You will collaborate closely with product, design, data, and frontend engineering to deliver features through rapid development cycles and deployment.

Who You Are and What You’ll Do

• Build & Scale Core Services
  • Architect backend systems powering user workflows, notifications, and automation features
  • Design APIs and microservices built for performance, efficiency, and scale
  • Quickly learn and apply new technologies as needed
  • Work with high-volume data systems and event-driven architectures
  • Improve observability, monitoring, logging, testing, and alerting
  • Identify performance bottlenecks and implement optimization strategies
  • Build distributed systems with multiple services, queues, external APIs, and asynchronous data flows
  • Ensure uptime, stability, and production resilience
  • Build resilient integrations with third-party services
  • Work in 2-week sprints with CI/CD and strong code quality practices
  • Partner with product, data, and frontend to ship features
  • Participate in system design and architecture reviews

What You Bring to the Team

• 6+ years of backend engineering experience, ideally in consumer apps, mobile, or SaaS, with at least 2 years in a senior-level role
• Expert-level proficiency in Ruby on Rails, including modern versions and best practices (this is central to the role)
• Hands-on production experience with PostgreSQL, including schema design, indexing strategies, query optimization, and performance tuning
• Strong expertise with Sidekiq for background job processing, including scheduling, throttling, batching, and reliability patterns
• Proficiency using Redis for caching, job queues, and distributed locking
• Experience with DynamoDB or comparable NoSQL databases
• Solid background in API design, RESTful principles, versioning, and serialization
• Proven track record of integrating with third-party APIs and external services
• Experience designing, building, and scaling distributed systems in production
• Familiarity with AWS services, including S3, DynamoDB, SQS, CloudWatch, and SES
• Strong skills in testing, CI/CD pipelines, logging/monitoring, debugging, and perfo