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Senior Developer at Ruby Labs. Remote Location: Ukraine. 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: . https://rubylabs.com/about-us/. About the role. We are looking for a Senior Developer to take a leading role in building scalable, high-performance web applications at Ruby Labs. This is a hands-on position that combines technical leadership, architectural design, and full-stack development. You’ll work closely with cross-functional teams — product, design, and marketing — to create seamless user experiences across our portfolio of digital products.. Key Responsibilities. Technical Leadership: Design system architecture, define the technology stack, and make key technical decisions for projects.. Team Management: Mentor, coach, and motivate developers through regular 1:1s, constructive code reviews, and career growth planning.. Full-Stack Development: Take an active, hands-on role in developing complex features and modules using Next.js for the frontend and Node.js 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 robust and scalable applications.. 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 user experience.. Innovation: Research and integrate emerging technologies, particularly AI-driven solutions, to improve products and streamline development workflows.. Required Technical Skills. At least 2 years of active, commercial experience with Next.js (v14.x/v15.x), including work on at least two recent projects where Next.js was the primary frontend framework.. Deep knowledge and 3+ years of hands-on experience with modern backend frameworks such as NestJS, Fastify, or Hono, with a clear understanding of their architectural trade-offs.. Strong proficiency with PostgreSQL and/or Supabase, including query optimization and schema design.. In-depth, practical knowledge of Prisma or Drizzle ORM, including experience building complex queries and managing migrations.. A solid understanding of caching strategies (e.g., in-memory, distributed cache, CDN) and experience applying them effectively to optimize performance (e.g., using Redis).. Full proficiency with Docker for creating, managing, and deploying containerized applications; experience with docker-compose is essential.. Practical experience integrating AI services (e.g., OpenAI API, LangChain) on both client and server sides, with a solid understanding of fundamental AI workflows.. Experience working with background workers and message queues (e.g., BullMQ, RabbitMQ) for handling asynchronous tasks.. Proven experience building secure systems, including protection against common vulnerabilities (OWASP Top 10), configuring Content Security Policy (CSP), CORS, securing APIs, and hardening hosting environments.. Experience working with analytics tools (e.g., Google Analytics, PostHog, Mixpanel) and platforms for A/B testing.. Leadership & Personal Qualities . At least 2 years of experience in a Team Lead, Tech Lead, or similar leadership role with direct responsibility for a development team.. A genuine passion for teaching, sharing knowledge, and helping team members grow professionally.. Excellent communication skills, with the ability to articulate complex technical concepts clearly to both technical and non-technical stakeholders.. The ability to understand business objectives and translate them into technical solutions that deliver real user value.. A proactive, results-oriented approach and a willingness to take ownership of both the team’s and the product’s success.. Other. 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).. Location. 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.. Benefits. 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/1dHF4ctKlez75whdn-ybUwP5d5Wr0BdwVrorrm_fM40Q/preview. . Be part of our fast-growing team and seize this excellent opportunity for personal and professional growth!. Interview Process. 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 (90 minutes). Final Interview (45 minutes). Life at Ruby Labs. 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