Senior Full-Stack Engineer

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/

Ruby Labs is looking for an experienced Full-Stack Engineer (Next.js / Node.js) to join one of its portfolio companies, a leading provider of payment solutions. This role is ideal for a hands-on technical leader who enjoys balancing system design, people leadership, and active product development.

You will be responsible for shaping the technical architecture, guiding a team of engineers, and contributing directly to the development of scalable, secure, and high-performance applications. Working closely with product, analytics, and business stakeholders, you will help drive technical decisions that support growth, experimentation, and continuous improvement.

We are seeking someone with a strong engineering mindset, a passion for mentorship, and the ability to align technical execution with real business impact in a fast-paced, product-driven environment.

• Technical Leadership: Design system architecture, define the technology stack, and make key technical decisions for our projects.

• Team Management: Mentor, coach, and motivate a team of developers through regular 1-on-1s, constructive code reviews, and career growth planning.

• FullStack Development: Take an active, hands-on role in developing complex features and modules using Next.js for the frontend and NodeJS for the backend.

• Process Management: Implement and optimize Agile methodologies (Scrum/Kanban), including sprint planning, task estimation, and delivery oversight.

• Quality Assurance: Enforce best practices in coding, testing, caching, and performance monitoring to ensure a robust and scalable application.

• Security: Design and implement comprehensive security measures at the application, infrastructure, and data levels.

• Analytics & Optimization: Collaborate closely with the product team to integrate analytics systems and conduct A/B tests to enhance the user experience.

• Innovation: Research and integrate emerging technologies, particularly AI-driven solutions, to improve the product and streamline development workflows.

• Next.js: Minimum 2 years active commercial experience (v14.x/v15.x), with at least two recent projects using Next.js as the primary frontend framework.

• NodeJS: At least 3 years hands-on with modern frameworks (NestJS, Fastify, Hono), with solid understanding of their architectural trade-offs.

• Databases: Strong PostgreSQL/Supabase skills, including query optimization and schema design.

• ORM: Expert in Prisma or Drizzle ORM, building complex queries and managing migrations.

• Caching: Deep knowledge of caching strategies (in-memory, distributed, CDN) and performance optimization (e.g., Redis).

• Docker: Proficient with Docker and docker-compose for containerized apps and deployments.

• Workers & Queues: Practical experience with background workers and message queues (e.g., BullMQ, RabbitMQ) for async tasks.

• Security: Experienced in secure system design, protecting against OWASP Top 10, CSP, CORS, API security, and hardened hosting.

• Analytics & A/B Testing: Skilled with analytics tools (Google Analytics, PostHog, Mixpanel) and A/B testing platforms.

• Leadership: 2+ years as Team Lead/Tech Lead with direct development team responsibility.

• Mentorship: Passionate about teaching, sharing knowledge, and fostering professional growth.

• Accountability: Proactive, results-driven, takes ownership of team and product success.

• Experience with CI/CD pipelines (e.g., GitHub Actions, GitLab CI).

• Experience with monorepo tools (e.g., Turborepo, Nx).

• Experience writing unit and integration tests (e.g., Jest, Playwright).

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/1tzxGX4Uu7Ts_HCLFXESKLnKaaBfVCPf1f9AYZPrkjJM/preview?tab=t.0

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 (30 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.

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