Staff Engineer

ABOUT NUMA Hey there! We’re Keystone AI, a forward-thinking hospitality brand redefining how people discover cities. We create spaces where simplicity meets innovation, offering thoughtfully designed rooms, studios, and apartments in the heart of Europe’s most vibrant neighbourhoods. We’re not just transforming the guest experience—we’re revolutionizing the hospitality industry from the inside out. Our cutting-edge technology streamlines operations, delivering unparalleled value with no hidden fees—just real, quality experiences. At Keystone AI, we believe that travel should be curious and authentic, and we bring those same values to our work culture. As part of our team, you’ll experience a dynamic and supportive environment where creativity thrives, and your contributions make a real impact. We’re committed to fostering a diverse, inclusive, and equitable workplace where every voice is valued, and different perspectives fuel our innovation. ABOUT THE ROLE Our full-stack solution is based on modern, serverless architecture. Powered by AWS (Lambda, SQS, SNS, DynamoDB, etc.) and using NodeJS, Typescript, NestJS and React. On the guest facing side we have Next.JS and React. It’s a robust, reliable solution that’s turning heads— and continuously evolving. In this role, you will: ● Own corporate-focused functionality across the numa ecosystem, taking responsibility for both technical direction and hands-on delivery. ● Build and drive cross-team, full-stack improvements for corporate guests and bookers in partnership with the teams that own the relevant product areas. ● Serve as a lead engineer for initiatives that span multiple verticals, systems, and user interfaces. ● Connect teams, systems, and codepaths to ensure corporate use cases are delivered as cohesive end-to-end solutions across the platform. ● Spar with Lead Engineers on technical decisions while securing buy-in for technical designs that advance the Corporate roadmap. ● Help drive the Engineering Organization’s shift towards full Agentic Engineering ABOUT YOU We encourage you to apply even if you don't think you meet all of the below criteria. We care most that you are excited about the role and our mission, and are willing to learn. Ideally, you have: ● AI-Native Engineer with a solid understanding of Agentic Engineering - you don’t just vibe code, you are able to confidently leverage agents to achieve your goals. ● 6+ years of professional full-stack engineering experience, with a strong track record of owning and delivering complex product improvements end to end. ● Strong experience with Next.js, TypeScript, React, React Native, and CSS, with the ability to build high-quality user-facing experiences across complex product surfaces. ● Strong experience with Node.js and API design, including designing solutions that integrate cleanly across multiple systems and domains. ● Strong experience with testing strategies, preferably including Storybook or @testing-library, MSW, and supertest. ● Strong experience with Serverless and Event Driven Architecture, preferably AWS focused. ● Solid understanding of IaC, experience with SST, is a plus. ● Proven ability to independently drive technical solutions from problem framing through implementation, coordinating effectively across multiple teams and codebases where needed. ● Strong product and business understanding, with the ability to translate requirements into pragmatic technical approaches that work across an ecosystem rather than within a single isolated scope. ● Strong ownership mindset, with the ability to identify gaps, surface dependencies and risks early, and maintain momentum in ambiguous, cross-team problem spaces. ● Good judgment in balancing speed, scalability, maintainability, and consistency when delivering solutions that span multiple verticals. ● Excellent communication and technical stakeholder management skills. ABOUT OUR OFFER Empower your career: Thrive in a fast-paced, collaborative environment where your ideas help shape our future. Enjoy opportunities for professional growth and build a fulfilling career path. Experience our brand: Immerse yourself in the Keystone AI lifestyle with a complimentary stay. Share the love with friends and family through exclusive discounts on our stylish apartments. Connect with a global community of colleagues at our inspiring team-building events. Keystone AI values the diversity of the people it hires and serves. Diversity at our company means fostering a workplace in which individual differences are recognised, appreciated, respected and responded to in ways that fully develop and utilise each person’s talents and strengths. We therefore welcome applications from people of all races, ethnicities, disability statuses, ages, religions, gender identities, and sexual orientations. For more information on the processing of your personal data, please see our Privacy Notice .