TL;DR

Senior Backend Engineer (AI): Designing, building, and scaling core backend systems for an AI product with an accent on distributed systems challenges and infrastructure excellence. Focus on designing scalable and resilient systems, optimizing existing services, and resolving complex production issues across distributed environments.

Location: Remote. Candidates must be located within approximately ±4 hours of CET (Central European Time).

Company

Ruby Labs is a leading tech company focused on creating innovative consumer products across health, education, and entertainment industries, including an AI product.

What you will do

Deliver new backend features with a focus on scalability, performance, and reliability.
Maintain, optimize, and improve existing services and infrastructure across AWS and Cloudflare.
Design, deploy, and operate backend services.
Implement and evolve monitoring and observability using tools such as Sentry and OpenTelemetry.
Investigate and resolve production issues across distributed systems.
Contribute to architectural decisions, documentation, and infrastructure planning.

Requirements

8+ years of overall professional experience, ideally including lead-level experience.
Deep expertise in distributed systems, system design, and backend architecture.
Strong understanding of database fundamentals, indexing, consistency, and replication.
Fluency in Node.js backend development.
Experience with cloud infrastructure (AWS) and backend service deployment.
Deep knowledge of Redis, including caching, pub/sub, queues, and performance tuning.
Strong experience with AWS services, including compute, serverless, networking, and infrastructure-as-code.
Experience with Cloudflare Workers, edge routing, caching, and security.
High standards for code quality, reliability, and communication.

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.
Unlimited PTO: Enjoy unlimited paid time off to recharge.
Paid National Holidays: Celebrate and relax on national holidays.
Company-provided MacBook: Experience seamless productivity with top-notch Apple MacBooks.
Flexible Independent Contractor Agreement: Unlock the benefits of flexibility, autonomy, and entrepreneurial opportunities.

Hiring process

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