Senior Backend Engineer (AI)

TL;DR

Senior Backend Engineer (AI): Designing, building, and scaling the core backend systems that power the AI product Use.ai with an accent on distributed systems challenges and feature delivery. Focus on infrastructure excellence, ensuring consistency, quality, and alignment across all projects.

Location: European Union, Serbia, Turkey, Moldova, Brazil, Montenegro, North Macedonia, Georgia, Bosnia, within approximately ± 4 hours of CET time zone.

Company

Ruby Labs is a leading tech company that creates and operates innovative consumer products across the health, education, and entertainment industries.

What you will do

• Deliver new backend features with a focus on scalability, performance, and reliability.
• Maintain, optimize, and improve existing services and infrastructure.
• Design, deploy, and operate backend services across AWS, Cloudflare, and other environments.
• Implement and evolve monitoring and observability using tools such as Sentry, OpenTelemetry (OTel), logging, alerting, and related platforms.
• Lead incident investigations, root cause analysis, and system reliability improvements.

Requirements

• Deep expertise in distributed systems, system design, and backend architecture.
• Strong understanding of database fundamentals, indexing, consistency, replication, transactions, and storage trade-offs.
• Proven ability to design scalable and resilient systems.
• Fluency in Node.js backend development.
• Experience with cloud infrastructure (AWS) and backend service deployment.
• Comfortable working in timezone ±2 hours from UK time.

Nice to have

• Experience working in startup environments or small, high-autonomy engineering teams.
• Passion for building and improving infrastructure, developer experience, and observability.

Culture & Benefits

• Remote Work Environment: Embrace the freedom to work from anywhere, anytime, promoting a healthy work-life balance.
• Enjoy unlimited paid time off to recharge and prioritize your well-being, without counting days.
• Celebrate and relax on national holidays with paid time off to unwind and recharge.
• Experience seamless productivity with top-notch Apple MacBooks provided to all employees who need them.
• Unlock the benefits of flexibility, autonomy, and entrepreneurial opportunities with a Flexible Independent Contractor Agreement.

Hiring process

• Recruiter Screening (40 minutes)
• First Interview (30 minutes)
• Technical Interview (45 minutes)
• Final Interview (30 minutes)