Senior Backend Engineer

About us

Ruby Labs is a leading tech company that creates and operates innovative consumer products. We offer a diverse range of opportunities across the health, education, and entertainment industries. Our innovative teams are driving the future of consumer‑led products, and we're always looking for passionate individuals to join us. Learn more about our story at:

At Ruby Labs we’re hiring a Senior Backend Engineer to help design, build, and scale the core backend systems that power our AI product Use.ai. This is a high‑ownership role for an engineer who loves solving distributed systems challenges and driving both feature delivery and infrastructure excellence. This position requires close collaboration with our development team to ensure consistency, quality, and alignment across all projects.

• Bring 8+ years of overall professional experience, ideally including lead‑level experience on the position of Lead Backend Developer.

• 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, Open Telemetry (OTel), logging, alerting, and related platforms.

• Investigate and resolve production issues across distributed systems.

• Write clean, maintainable code aligned with SOLID principles, system design, and backend best practices.

• Lead incident investigations, root cause analysis, and system reliability improvements.

• Contribute to architectural decisions, documentation, and infrastructure planning.

• Collaborate with high standards for communication, ownership, and delivery.

• 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.

• Strong grasp of software engineering principles, including SOLID.

• Experience debugging complex issues in production environments.

• Experience with cloud infrastructure (AWS) and backend service deployment.

• Experience implementing monitoring and observability using tools such as Sentry and Open Telemetry (OTel), including tracing, logging, and alerting.

• High standards for code quality, reliability, and communication.

• Deep knowledge of Redis, including caching, pub/sub, queues, replication, persistence, and performance tuning.

• Strong experience with AWS services, including compute, serverless, networking, storage, security, and infrastructure‑as‑code.

• Experience with Cloudflare Workers, edge routing, caching, and security primitives.

• Familiarity with Sentry performance monitoring and Open Telemetry instrumentation at scale.

• Comfortable working in timezone ±2 hours from UK time.

• Experience working in startup environments or small, high‑autonomy engineering teams.

• Passion for building and improving infrastructure, developer experience, and observability.

Ruby Labs operates within the CET (Central European Time) zone. Applicants from any country are welcome to apply for the position as long as they are located within approximately ± 4 hours of CET. This ensures optimal collaboration and communication during working hours.

Discover the perks of being part of our vibrant team! We offer:

• Remote Work Environment: Embrace the freedom to work from anywhere, anytime, promoting a healthy work‑life balance.

• Unlimited PTO: Enjoy unlimited paid time off to recharge and prioritize your well‑being, without counting days.

• Paid National Holidays: Celebrate and relax on national holidays with paid time off to unwind and recharge.

• Company‑provided Mac Book: Experience seamless productivity with top‑notch Apple Mac Books provided to all employees who need them.

• Flexible Independent Contractor Agreement: Unlock the benefits of flexibility, autonomy, and entrepreneurial opportunities. Benefit from tax advantages, networking opportunities, reduced employment…