Senior Next.js Full Stack Engineer

Ruby Labs is a leading tech company that creates and operates innovative consumer products across the health, education, and entertainment industries. They are 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, battle-tested in production, monetizing at scale, and entering a phase of rapid growth and expansion. They have recently launched a second product in the same ecosystem and are building a world-class engineering organization to support continued scale.

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.

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.

• 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.

Applicants must be located within approximately ± 4 hours of the Central European Time (CET) zone to ensure optimal collaboration and communication during working hours.