Senior Backend Engineer II – AI Feature Builder

Role Overview

• Be accountable for the technical health, scalability, and long-term sustainability of a defined backend subsystem or domain.
• Lead complex technical initiatives spanning multiple cycles with end-to-end responsibility from problem framing to measurable stabilization.
• Design robust backend architectures and implementation plans that reduce operational risk and improve system performance.
• Break down ambiguous or loosely defined problems into clear technical strategies with explicit trade-offs.
• Collaborate closely with Engineering Managers and Product to align technical solutions with business priorities and customer needs.
• Improve backend reliability by proactively identifying systemic risks, technical debt, and architectural bottlenecks within the domain and drive remediation before they impact teams or customers.
• Contribute hands-on to the backend codebase, delivering high-quality, secure, well-structured, and maintainable code.
• Raise engineering standards through thoughtful code reviews, documentation, and technical guidance.
• Mentor mid-level and senior engineers across the Backend pillar, supporting their growth toward greater technical ownership.
• Support production stability by actively participating in debugging, root cause analysis, and long-term remediation efforts.
• Contribute to evolving backend development practices, testing strategies, CI/CD workflows, and performance optimization efforts.
• Act as a technical reference point within a defined backend domain, fostering alignment and reducing cross-team friction.

Requirements

• 9+ years of relevant experience as a Backend Engineer, with demonstrated ownership of complex systems or subsystems.
• Strong experience with Ruby on Rails (preferred) or comparable backend frameworks.
• Proven experience designing and implementing scalable APIs and backend services.
• Strong expertise in PostgreSQL and database design; familiarity with NoSQL or vector databases (e.g., Qdrant, Pinecone, or Weaviate) is a plus.
• Deep understanding of software design principles, testing strategies, CI/CD, and backend reliability practices.
• Experience working with distributed systems, background jobs (e.g., Sidekiq), caching layers (e.g., Redis), and cloud infrastructure (AWS preferred).
• Familiarity with modern AI/ML services or data-intensive workflows is desirable.
• Experience leading technical initiatives or large refactors across teams is highly valued.
• Strong problem-solving skills and ability to operate effectively in complex, evolving environments.
• Excellent written and verbal communication skills in a collaborative, remote-first setting.
• Bachelor’s or Master’s degree in Computer Science or equivalent practical experience.

Tech Stack

• AWS
• Cloud
• Distributed Systems
• NoSQL
• Postgres
• Redis
• Ruby
• Ruby on Rails

Benefits

• Monthly remote work stipend (home internet costs, electricity). Home office equipment package right at the start (laptop, keyboard, monitor…)
• Home office equipment upgrade (furniture, ear plugs …) or membership to a local co-working space after your onboarding
• Sick leave benefit, parental leave and 25 days of annual leave plus your local national holidays
• Personal development fund for courses, books, conferences, and material
• VSOP (Virtual Stock Option Plan)
• The annual international team-building trip, quarterly and monthly online get-togethers
• As a fully remote company, with work-life balance at its core, you’ll enjoy flexible schedules
• An international team that loves to have fun at work and works hard together to accomplish shared goals