Senior Backend Engineer (Remote)

About the role

Mode is a fast-growing technology company whose mobile apps and digital products reach 100M+ monthly active users, and it is expanding its AI and data business. It is looking for a Senior Backend Engineer to take ownership of production backend systems and help integrate and evolve new products. This is a hands-on, remote role for someone comfortable entering unfamiliar codebases and turning complex systems into reliable, maintainable production systems.

Key responsibilities

• Build and scale core services: architect backend systems for user workflows, notifications and automation, and design APIs and microservices.
• Work with high-volume data systems and event-driven architectures, and build distributed systems with queues, external APIs and asynchronous flows.
• Improve observability, monitoring, logging, testing and alerting, and fix performance bottlenecks.
• Integrate with third-party services and work in 2-week sprints with CI/CD and strong code quality.
• Take ownership of existing backend services, investigate production issues and reduce reliance on tribal knowledge.

Required profile

• 6+ years of backend engineering experience, ideally in consumer apps, mobile or SaaS, with at least 2 years in a senior role.
• Experience owning an existing production system or codebase, and debugging systems you did not design.
• Comfortable with incomplete documentation, ambiguity and fast-moving remote startup environments.

Required skills

• Ruby on Rails and PostgreSQL (schema design, indexing, query optimization).
• Sidekiq for background jobs; API design, REST, versioning and serialization.
• Testing, CI/CD pipelines, logging, monitoring and performance optimization.
• Integration with third-party APIs; preferred: Redis, Shoryuken, Stripe, DynamoDB, AWS (S3, SQS, CloudWatch, SES) and event-driven architecture.

What we offer

• 100% remote-first, global company with a competitive compensation package.
• Equity plan participation (full-time members) and individual bonuses.
• Open PTO, generous holidays and wellness days, weekly meeting-free days, and remote social activities.