Senior Next.js Full Stack Engineer

Ruby Labs is a tech company with a portfolio of consumer products in health, education, and entertainment (100M+ annual users). We’re building and scaling a profitable D2C platform used by hundreds of thousands of customers globally, processing large volumes of traffic and revenue every month.

The product is well beyond MVP: it’s battle-tested in production, monetizing at scale, and now entering a phase of rapid growth and expansion. We’ve recently launched a second product in the same ecosystem and are doubling down on building a world-class engineering organization to support continued scale.

We’re looking for a Senior Next.js Full-Stack Engineer who can combine hands-on technical excellence with strong ownership. This role is not about maintaining a legacy system. It’s about scaling real products used by real users — fast.

Responsibilities:

• Take ownership of core product components from concept to deployment.

• Collaborate with the Product team to design scalable and maintainable architectures.

• Participate in (and lead) code reviews and ensure best practices across the team.

• Mentor junior and mid-level developers, providing guidance and fostering growth.

• Contribute to hiring and onboarding new team members.

• Maintain high code quality and application performance in a fast-paced, high-traffic environment.

• Set up and improve CI/CD pipelines and development workflows.

• Monitor, debug, and improve the stability and scalability of the system.

• Help shape the engineering culture as the team grows.

َQualifications:

Core Technical Skills

• At least 4 years of experience with Next.js for full-stack application development.

• At least 2 years of experience with Next.js App Router.

• Strong expertise in JavaScript/TypeScript and modern ReactJS.

• Experience leading a small team in a continuous deployment environment.

• Experience with CI/CD pipelines, Docker, and cloud infrastructure (preferably AWS, Cloudflare).

• Solid understanding of PostgreSQL and Redis, including performance tuning and schema design.

• Experience with A/B testing frameworks and using analytics to drive product decisions.

• Familiarity with CMS (preferably Payload).

Leadership & Collaboration

• Demonstrated ability to mentor other engineers and elevate team performance.

• Clear communication style — able to explain complex topics clearly and concisely.

• A proactive mindset — you spot issues before they become problems and take ownership.

• Comfortable making technical decisions and defending them with logic and data.

• Experience leading teams or projects.

• Fluency in Russian and English.

Nice to Have

• Experience in D2C SaaS products.

• Exposure to performance marketing, customer funnel optimization, or rapid MVP cycles.

• Contributions to open-source or technical blogs.

• Experience working in a fast-paced, high-growth startup environment.

We offer:

• Fully remote work (within ±4h of CET).

• Unlimited PTO + paid national holidays.

• Company-provided MacBook.

• Flexible Independent Contractor agreement with tax advantages.