Senior Full-Stack Engineer (Next.js)

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: https://rubylabs.com/about-us/

We're building and scaling a profitable D2C product 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're doubling down on building a world-class engineering organization to support continued scale.

We're looking for a Senior Full-Stack Engineer who can take meaningful ownership of complex areas of the product — and run with them. You won't be waiting for tickets or specs. You'll be expected to drive technical decisions in your area, push back on scope when it's wrong, flag unrealistic timelines early, and own product areas end-to-end with minimal supervision.

This is not about maintaining a legacy system. It's about scaling real products used by real users — fast, and shipping in days, not weeks.

If you're looking for a comfortable 9–5 role, this won't be the right fit. But if you're excited by ownership, accountability, and building high-quality systems under real-world pressure, read on.

• Own complex product areas end-to-end — from architecture decisions through implementation, deployment, and post-launch iteration.

• Drive technical direction in your area without waiting for tickets or detailed specs.

• Provide engineering input directly to Product and leadership — push back on scope, flag risks, propose better solutions.

• Take responsibility for the reliability, performance, and scalability of your area in a high-traffic environment.

• Participate in (and lead) code reviews and raise engineering standards across the team.

• Mentor mid-level engineers and help elevate the team's technical bar.

• Contribute to hiring and onboarding new engineers.

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

• Monitor, debug, and improve the stability of production systems.

• Help shape engineering culture and best practices as the team grows.

Core Technical Skills

• 4+ years of hands-on, production experience building and maintaining full-stack web applications.

• Strong, practical experience with React and Next.js, including at least 2 years working with the Next.js App Router in production.

• Deep understanding of TypeScript and modern frontend architecture patterns.

• Proven ability to own features end-to-end — from vague requirements to production-ready implementation.

• Solid experience with PostgreSQL, including query optimization, schema design, and data modeling.

• Working knowledge of caching strategies and performance considerations (Redis or equivalent).

• High bar for code quality, maintainability, and readability.

• Strong proficiency with Git, Docker, and modern development workflows.

• Comfortable with CI/CD pipelines and cloud-based environments (AWS, Cloudflare preferred).

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

Ownership & Autonomy

• Demonstrated ability to own complex areas of a product without needing detailed direction.

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

• Proactive — you spot issues before they become problems and raise them early.

• Strong communicator — you explain complex topics clearly and provide engineering input directly to product and leadership.

• Comfortable pushing back on unrealistic scope or timelines, and proposing better alternatives.

Mindset

• You take responsibility for outcomes, not just tasks.

• You ship in days, not weeks, without compromising on quality.

• Comfortable working under pressure and navigating ambiguity.

• A pragmatic builder who balances speed with long-term maintainability.

• You raise the bar for the team — others learn from how you work.

Any combination of the following is a strong signal — we'll teach the right person what they don't already know:

• CMS work — experience with headless CMS architectures (Payload preferred, or Strapi, Sanity, Contentful, or similar).

• Billing & subscription systems — experience integrating, maintaining, or debugging payment/subscription infrastructure (Stripe, Paddle, Recurly, RevenueCat, or similar). Familiarity with dunning, dispute handling, retry logic, and cancellation flows.

• Low-level PDF work — experience with PDF rendering, manipulation, or editor libraries (pdf-lib, PDF.js, PSPDFKit / Nutrient, Apryse, react-pdf). Willingness to work close-to-the-metal in a PDF viewer or editor.

• Experience with D2C SaaS or subscription-based products.

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

• Prior experience with Nest.js or similar Node.js frameworks.

• Open-source contributions, side projects, or a strong GitHub/portfolio.

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 MacBook: Experience seamless productivity with top-notch Apple MacBooks 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 obligations, and the freedom to work from anywhere. Read more about it here: https://docs.google.com/document/d/1nkrN76JlZkbKj9WSOhlT1_mni_CZeDkHdwfIjPXVwvk/preview?tab=t.0#heading=h.ndsdl4wapxtt

Be part of our fast-growing team and seize this excellent opportunity for personal and professional growth!

After submitting your application, we conduct a thorough review which typically takes 3 to 5 days, but may occasionally take longer due to the volume of applications received. If we see a potential fit, we proceed with the following steps:

• Recruiter Screening (40 minutes)

• Technical Interview (60 minutes)

• Final Interview (45 minutes)

At Ruby Labs, we move fast, aim high, and expect the same from our team. We’re not here to play small—we’re here to build, grow, and win. That means we look for people who are ambitious, driven, and ready to give their best every single day.

This is a place for individuals who thrive under pressure, embrace challenges, and see opportunity in every obstacle. If you’re hungry to achieve, motivated by impact, and want to grow at the speed of your own ambition, Ruby Labs offers the platform to make it happen.

Here, effort is matched with reward. We recognize those who go all in and deliver results, and we create space for people who want more—more responsibility, more growth, and more success.

#LI-Remote