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Email Growth Manager at ruby-labs | European Union

ruby-labs

Full-time|Remote|European Union

Role Overview ruby-labs is hiring an Email Growth Manager to lead email marketing efforts focused on user engagement and retention. This role shapes the strategy and execution of campaigns that connect with our audience and support growth across all platforms.

Apr 20, 2026

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Senior Backend Engineer at Ruby Labs | European Union

Ruby Labs

Full-time|On-site|European Union

Join Our Team!At Ruby Labs, we are at the forefront of technology, creating and managing groundbreaking consumer products that redefine the way we engage with health, education, and entertainment. Our dynamic and innovative teams are shaping the future of consumer-centric solutions. If you’re passionate about technology and eager to make an impact, we invite you to explore our story here.Your RoleWe are seeking a talented Senior Backend Engineer who will be instrumental in designing, developing, and scaling the backend systems that support our AI product Use.ai. This position offers significant ownership and the opportunity to tackle complex distributed systems challenges, while ensuring the delivery of features and infrastructure excellence. Collaborate closely with our development team to maintain high standards of quality and alignment across projects.Key ResponsibilitiesDevelop and implement new backend features with an emphasis on scalability, performance, and reliability.Optimize and enhance existing services and infrastructure.Design, deploy, and manage backend services across AWS, Cloudflare, and other platforms.Utilize tools like Sentry and OpenTelemetry for monitoring and observability improvements.Address and resolve production issues within distributed systems.Write clean, maintainable code that adheres to SOLID principles and best practices.Lead investigations into incidents, perform root cause analyses, and enhance system reliability.Contribute to architectural decisions, documentation, and infrastructure planning.Foster open communication and uphold a culture of ownership and delivery.

Feb 19, 2026

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Lead Full-Stack Engineer at Ruby Labs | European Union

Ruby Labs

Full-time|On-site|European Union

Join Our TeamAt Ruby Labs, a pioneering technology company, we are dedicated to developing and managing innovative consumer products across health, education, and entertainment sectors. Our dynamic teams are at the forefront of consumer-oriented innovations, and we are eager to welcome passionate individuals to join our mission. Discover more about us here.Your RoleWe are excited to announce an opening for a Lead Full-Stack Engineer to spearhead the development of a new Direct-to-Consumer product within the AI sector. As a Lead Engineer, you will guide an engineering squad responsible for a crucial segment of our product, setting the technical vision and ensuring high standards for engineering quality and delivery.In this role, you will create and sustain scalable systems utilizing Next.js, TypeScript, React, and Redis. You will also oversee the development process, manage release schedules, perform code reviews, and provide mentorship to fellow engineers. A key requirement for this position is a proven track record in developing AI-driven tools or applications.You will collaborate closely with product leadership and management to guarantee that our engineering team consistently delivers reliable and high-performing features.

Mar 15, 2026

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User Acquisition Manager

ruby-labs

Full-time|On-site|European Union

Role overview ruby-labs is hiring a User Acquisition Manager to drive growth efforts across several platforms. The role centers on bringing in new users and building a stronger brand presence. This position is located within the European Union. What you will do Create and implement user acquisition strategies aligned with business objectives. Review and interpret campaign data to boost conversion rates and campaign impact. Collaborate with teams throughout the company to improve product features and user experience. Keep an eye on industry trends and competitor moves to identify fresh growth opportunities.

Apr 23, 2026

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Senior AI Engineer - Node.js / Next.js / TypeScript

Ruby Labs

Full-time|On-site|European Union

Ruby Labs builds and manages consumer products across health, education, and entertainment. The team focuses on practical, user-driven solutions and values technical curiosity. Learn more about the company at https://rubylabs.com/about-us/. Role Overview This Senior AI Engineer position centers on Node.js, Next.js, and TypeScript. The role shapes AI infrastructure and improves production-ready large language model (LLM) experiences. Day-to-day, the engineer makes data-driven decisions that affect model performance, reliability, and cost control. What You Will Do Develop prompt systems for LLMs and manage structured outputs. Design and orchestrate complex LLM workflows using tools such as LangChain and LlamaIndex. Maintain observability and strong debugging practices, using Langfuse and AI gateways like OpenRouter. Drive model quality and operational efficiency from experimentation through live production. Take full ownership of key AI features, ensuring they are robust and production-ready. Location This role is open to candidates based in the European Union.

Apr 14, 2026

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User Experience Researcher

Ruby Labs

Full-time|Remote|European Union

Ruby Labs is seeking a User Experience Researcher based in the European Union. This position centers on understanding how people interact with digital products and using those insights to inform design choices. Role overview The User Experience Researcher works closely with designers and product managers to gather and interpret user feedback. This role combines qualitative and quantitative research methods to uncover user needs and behaviors, helping the team create products that are both intuitive and satisfying to use. What you will do Conduct research to explore user behaviors and preferences Analyze feedback from users to identify trends and opportunities Collaborate with cross-functional teams to improve digital product experiences Requirements Experience with both qualitative and quantitative research methods Strong interest in user-centered design Ability to work effectively with designers and product managers

Apr 29, 2026

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Growth Manager

Ruby Labs

Full-time|Remote|European Union

Ruby Labs is looking for a Growth Manager based in the European Union. This position focuses on developing and executing strategies to increase customer acquisition and expand market reach. Role overview The Growth Manager will shape and implement growth initiatives across various channels. The role involves analyzing data to spot new market opportunities and improve outreach efforts. Contributing to the company’s expansion, this position requires both creative thinking and strong analytical skills. What you will do Drive growth strategies to support business scaling Identify and evaluate new market opportunities Enhance customer acquisition through multiple channels Requirements Experience with growth strategy and customer acquisition Strong analytical and problem-solving skills Ability to work with cross-functional teams

Apr 28, 2026

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Senior Growth Product Manager

ruby-labs

Full-time|On-site|European Union

We are seeking a highly motivated and experienced Senior Growth Product Manager to join our dynamic team at ruby-labs. In this role, you will play a pivotal part in driving product growth and enhancing user engagement through innovative strategies and data-driven decisions.Your responsibilities will include analyzing market trends, defining product roadmaps, collaborating with cross-functional teams, and leading initiatives that contribute to our overall growth objectives. You will have the opportunity to leverage your expertise in product management to develop and implement solutions that meet the needs of our users and drive business success.

Mar 30, 2026

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Mid-Senior UX Researcher

Ruby Labs

Full-time|On-site|European Union

About UsAt Ruby Labs, we pride ourselves on being a pioneering technology firm dedicated to developing and managing cutting-edge consumer products. Our diverse portfolio encompasses exciting opportunities in health, education, and entertainment sectors. We are at the forefront of consumer-driven innovation and are continuously seeking enthusiastic talent to join our team. Discover more about our journey at: https://rubylabs.com/about-us/About the RoleWe are in search of a motivated and experienced Mid-Senior UX Researcher who will significantly influence our product development and user experience. This role involves conducting in-depth research, analyzing user interactions, and crafting intuitive wireframes for both desktop and mobile platforms.Key ResponsibilitiesPerform competitor and market analysis to gain insights into user behaviors, journeys, challenges, and requirements.Evaluate existing user interfaces and the design of our current offerings.Employ design tools such as Visily or Figma to produce wireframes, prototypes, and mockups.Create detailed user personas, customer journey maps, and conduct usability studies to facilitate data-driven decision-making.Work collaboratively with product managers, developers, and designers to ensure a coherent user experience.Validate design concepts through A/B testing, surveys, interviews, and analytics.Document research outcomes and present key findings to stakeholders.Keep abreast of industry trends and best practices in UX to continually enhance our methodologies.

May 2, 2026

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UX Lead for Product & Growth

Ruby Labs

Full-time|On-site|European Union

Join Our Team as a UX LeadAt Ruby Labs, we are at the forefront of technology, dedicated to developing and managing breakthrough consumer products. We pride ourselves on our diverse portfolio spanning health, education, and entertainment sectors. Our vision is driven by innovative teams that are shaping the future of consumer-centric solutions. Explore our journey and values at: https://rubylabs.com/about-us/Your RoleAs we scale our high-growth direct-to-consumer product utilized by a vast customer base worldwide, we recognize that user experience (UX) is pivotal to our growth strategy.We are in the process of launching new products, enhancing our capabilities, and prioritizing customer retention, activation, and overall funnel performance.We are seeking a UX Lead who will assume complete responsibility for design, user experience, and user research—not as a peripheral function, but as a fundamental force driving product and business success.Currently, design is primarily executed directly in the frontend, and our UX research requires a more structured approach. You will be instrumental in transforming this landscape.This is a dynamic role requiring high levels of ownership and impact, ideal for an individual eager to build systems, lead teams, and directly influence product growth.Key ResponsibilitiesOversee and enhance UX, design quality, and user journeys across all products.Establish and maintain a robust, scalable design system, even if primarily implemented in the frontend.Lead and mentor designers and frontend engineers engaged in UI/UX projects.Transform UX into a measurable growth driver by boosting activation, retention, and conversion rates.Collaborate closely with Product and Growth teams to design and streamline funnels, onboarding processes, and monetization strategies.Develop a structured methodology for UX research, which includes:Setting research priorities,Conducting surveys and interviews,Deriving actionable insights.Make data-driven UX decisions by:Analyzing product metrics (using tools like Mixpanel and Clarity),Identifying opportunities for UX enhancements.

Mar 31, 2026

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User Acquisition Manager

ruby-labs

Full-time|Remote|European Union

Role overview ruby-labs is hiring a User Acquisition Manager to drive growth strategies across the European Union. The focus is on planning and managing user acquisition campaigns, with a strong emphasis on analytics and market research to guide decisions and improve results. What you will do Create and launch user acquisition campaigns designed for the EU market Analyze data and apply market insights to boost campaign performance and return on investment Collaborate with teams throughout the company to optimize advertising channels Explore and test new approaches for attracting and retaining users Location This role is based in the European Union.

Apr 23, 2026

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Lead Senior Conversion Rate Optimization Manager

Ruby Labs

Full-time|On-site|European Union

Ruby Labs develops and manages consumer products spanning health, education, and entertainment. The company encourages teams to create new solutions for everyday challenges. More about the company’s mission can be found at https://rubylabs.com/about-us/. Role overview This Lead Senior Conversion Rate Optimization Manager position is based in the European Union. The main focus is to drive measurable improvements in conversion rates, with a specific target of achieving a 15% increase within one quarter. What you will do Own the entire conversion optimization process, starting from data analysis through to implementation. Create hypotheses and design high-fidelity mockups to test potential improvements. Collaborate closely with developers to ensure CRO initiatives are rolled out effectively. Take responsibility for performance outcomes, not just for making recommendations. Compensation Compensation is performance-driven. Significant financial rewards are available for those whose work delivers strong results.

Apr 22, 2026

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Senior Growth Product Manager

ruby-labs

Full-time|On-site|European Union

ruby-labs is seeking a Senior Growth Product Manager based in the European Union. This position centers on shaping product strategy and leading growth initiatives to strengthen the company’s market position. Role overview The Senior Growth Product Manager will focus on analyzing market trends and collecting customer insights. The goal is to identify opportunities that improve product offerings and increase user engagement. Success in this role depends on a strong understanding of both customer needs and competitive dynamics. Collaboration This role works closely with teams from different disciplines. Expect to partner with colleagues across product, engineering, design, and marketing to develop solutions that address user needs and support company growth. Key responsibilities Drive product strategy and growth-focused projects Analyze market trends and customer feedback Enhance product features to increase user engagement Collaborate with cross-functional teams to deliver new solutions

Apr 29, 2026

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Ad Creative Producer

Ruby Labs

Full-time|On-site|European Union

About UsAt Ruby Labs, we are at the forefront of technology, crafting and managing groundbreaking consumer products that enhance lives. Our diverse portfolio spans the health, education, and entertainment sectors, offering abundant opportunities for innovative thinkers. Join our passionate team as we shape the future of consumer-driven solutions. Discover more about our mission at: https://rubylabs.com/about-us/About the RoleWe are on the lookout for a creative and resourceful Ad Creative Producer to elevate our vibrant marketing team! This full-time role will play a crucial role in steering the creative process for our marketing campaigns across various consumer brands. You will be tasked with generating captivating ad concepts, managing production timelines, and collaborating with cross-functional teams to ensure our advertisements not only engage but also convert effectively. Reporting directly to the Ad Creative Lead, you will work closely with User Acquisition Managers to fine-tune and enhance our advertising strategies based on analytical insights.Key ResponsibilitiesCreative Development:Spearhead the brainstorming and conceptualization of innovative ad creatives that resonate with a wide audience, focusing on strategies that drive customer acquisition.Stay abreast of industry trends to incorporate cutting-edge elements into our creative production, ensuring our advertisements are both alluring and effective at converting viewers into customers.Partner with design teams to translate concepts into compelling ad creatives that align with brand identity and fulfill campaign objectives.Project Management:Supervise the production timeline to guarantee all projects are completed punctually and align with the creative vision, with a particular focus on maximizing customer acquisition impact.Collaborate with designers, user acquisition managers, and other team members to ensure a seamless workflow and delivery of high-quality outputs.Performance Analysis:Work in partnership with User Acquisition Managers to assess the performance of ad creatives across multiple platforms, identifying top performers to refine our advertising approach.

Feb 18, 2026

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Senior Next.js Full Stack Engineer

Ruby Labs

Full-time|Remote|European Union

Role Overview Ruby Labs is hiring a Senior Next.js Full Stack Engineer based in the European Union. This role focuses on building and maintaining dynamic web applications as part of a collaborative development team. Projects often involve new features and technical challenges that require strong problem-solving skills and hands-on experience. What You Will Do Develop and enhance web applications using Next.js and related technologies Work closely with other engineers to deliver high-quality, maintainable code Contribute ideas and solutions to technical discussions within the team Take on new challenges as projects evolve Who We’re Looking For Significant experience with Next.js and full stack web development Comfort working in a team setting and sharing knowledge with peers Motivation to learn and adapt to new technologies and project needs Based in the European Union

Apr 15, 2026

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Senior Creative Producer for Performance Marketing

Ruby Labs

Full-time|On-site|European Union

About UsAt Ruby Labs, we are at the forefront of technology, developing and managing cutting-edge consumer products across the health, education, and entertainment sectors. Our teams are passionate about innovation and are dedicated to creating products that enhance the lives of consumers. We invite you to explore our journey and learn more about us at: https://rubylabs.com/about-us/About the RoleWe are on the lookout for a creative and driven Senior Performance Creative to elevate our marketing initiatives at Ruby Labs. In this full-time position, you will play a pivotal role in shaping our advertising strategies for multiple consumer-centric brands. Your responsibilities will include crafting compelling ad concepts, overseeing production schedules, and collaborating with cross-functional teams to ensure our creatives both engage and convert. You will report directly to the Ad Creative Lead and work closely with User Acquisition Managers to refine our advertising strategies based on performance insights.Key ResponsibilitiesCreative Development:Lead the brainstorming and conceptualization of innovative ad creatives that connect with diverse audiences, focusing on strategies that boost customer acquisition.Stay informed on market trends to incorporate cutting-edge elements into our creative production, ensuring our outputs are captivating and drive conversions.Collaborate with design teams to transform concepts into impactful ad creatives that align with brand identity and campaign objectives.Project Management:Manage the production workflow to ensure timely delivery of all projects while maintaining the creative vision, particularly in enhancing customer acquisition impact.Coordinate with designers, user acquisition managers, and other stakeholders to facilitate smooth operations and high-quality results.Performance Analysis:Work in tandem with User Acquisition Managers to evaluate the performance of ad creatives across various platforms, identifying successful strategies and areas for improvement.

Feb 19, 2026

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AI Engineer

ruby-labs

Full-time|On-site|European Union

Join ruby-labs as an AI Engineer and contribute to innovative projects that leverage artificial intelligence to solve complex challenges. We are looking for a passionate individual who is eager to work with cutting-edge technologies and collaborate with a diverse team of professionals.Your role will involve designing, implementing, and optimizing AI models and algorithms. You will have the opportunity to work on real-world applications and make a significant impact within the company.

Mar 30, 2026

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Lead React Native Developer

Ruby Labs

Full-time|On-site|European Union

About UsAt Ruby Labs, we are at the forefront of technology, developing and managing cutting-edge consumer products. Our portfolio spans various sectors, including health, education, and entertainment, providing numerous opportunities for innovation and creativity. We are passionate about creating products that enhance the lives of consumers and are constantly seeking enthusiastic individuals to join our dynamic team. Discover more about our journey and mission at Ruby Labs.About the RoleWe are currently seeking a talented Lead React Native Developer to join our expanding engineering team. In this pivotal role, you will be responsible for spearheading our mobile initiatives, focusing on product quality and tackling architectural challenges. You will have the opportunity to take ownership of critical features that our users depend on, while significantly contributing to the enhancement and scalability of our mobile applications.Your expertise will be instrumental in shaping the future of our mobile offerings, collaborating with backend and product teams to ensure a seamless, high-performance user experience.Key ResponsibilitiesOversee the development and launch of new mobile product features.Enhance and maintain the existing React Native codebase to ensure optimal performance and stability.Define and evolve mobile architecture, system design, and technical strategies.Collaborate with backend, product, and design teams to create scalable solutions.Establish reliability, performance, and observability standards for mobile applications.Manage production debugging, incident investigations, and root cause analyses.Facilitate improvements in build systems, CI/CD processes, releases, testing, and app store submissions.Mentor junior engineers and cultivate a culture of quality, accountability, and excellence.Support recruitment efforts to build a top-tier mobile engineering team.Champion performance optimizations across various metrics including rendering, navigation, and offline capabilities.Lead with a focus on accountability for failure scenarios, API degradation, user recovery experiences, and resilience.Qualifications5+ years of experience in mobile application development, with a strong focus on React Native.2+ years in a technical leadership or lead developer role.Proficient in mobile architecture, design patterns, and best practices.Experience with CI/CD tools and automated testing frameworks.Strong problem-solving skills with a passion for coding and software design.Excellent communication skills, both verbal and written.

Feb 24, 2026

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Senior Full-Stack Software Developer

Ruby Labs

Full-time|On-site|European Union

About UsRuby Labs is an innovative technology company dedicated to developing and managing cutting-edge consumer products that span the health, education, and entertainment sectors. Our dynamic teams are at the forefront of consumer-driven solutions, and we are on the lookout for enthusiastic professionals to join our journey. Discover more about our mission and vision at: https://rubylabs.com/about-us/About the RoleWe are seeking a Senior Full-Stack Software Developer to join one of Ruby Labs' portfolio companies. This role involves designing and implementing robust user interfaces utilizing pre-built component libraries. It is tailored for developers who excel in structured environments, have a knack for translating design specifications into efficient, scalable code, and are committed to creating seamless, user-friendly experiences. If you thrive in a results-oriented atmosphere and take pride in delivering intuitive, scalable UI without ambiguity in design, this position is for you.Key ResponsibilitiesFrontend DevelopmentCraft high-quality user interfaces with Next.js, React, and TypeScript, utilizing libraries like NextJS, HeroUI, and Tailwind CSS.Produce clean, scalable, and maintainable code, ensuring optimal performance and responsiveness across various browsers and devices.Develop and maintain reusable frontend components.Backend DevelopmentBuild robust backend services and high-quality applications using Node.js (with Nest.js).Write clean, efficient, and scalable backend code.Design and optimize database schemas and queries for performance and scalability.UI Implementation & Design IntegrationAccurately convert design wireframes and layouts into functioning frontend implementations.Maintain consistency, usability, and accessibility across all UI implementations.Enhance interfaces for maximum performance and user satisfaction.Collaboration & ProcessWork closely with cross-functional teams to ensure seamless project delivery and integration.

May 2, 2026

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Senior Product Marketing Manager - Core

Castai Group Inc.

Full-time|On-site|European Union

Role Overview Castai Group Inc. is looking for a Senior Product Marketing Manager - Core based in the European Union. This role shapes product marketing strategy and works closely with cross-functional teams to define product positioning, messaging, and go-to-market plans. The position focuses on connecting with target audiences and supporting product direction to help reach more of the market.

Apr 20, 2026

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