Senior Full Stack Engineer (NodeJS / ReactJS) This range is provided by Twelve. Your actual pay will be based on your skills and experience — talk with your recruiter to learn more. Base pay range Direct message the job poster from Twelve Co-Founder at Twelve; Hiring Engineers in NYC & London 👀 Senior Full Stack Engineer (React, Node.js, AWS) Location: UK (Remote) - Full Time. This well-funded telecoms start-up is hiring for a Senior Full Stack Engineer to join their foundational team. This ambitious company is poised to redefine the telecoms industry by building a modern, intelligent, and scalable connectivity platform from the ground up. This is a rare opportunity to get in on the ground floor, build a platform from scratch, and shape the future of a new technology without the constraints of legacy code. The Role The company is not looking for a traditional DevOps engineer or a siloed frontend developer. They are seeking a true Full Stack Engineer who is also a systems‑thinker. The successful candidate will be a pivotal member of a small, high‑performance team, responsible for designing, building, and deploying the core of the platform. This role requires an engineer who can move fluidly across the stack—from architecting a new microservice in Node.js to building a beautiful, performant user interface in React and Next.js, all while managing the AWS infrastructure it runs on. The ideal candidate is a "builder" who not only writes proficient application code but also understands the underlying architecture, data layer, and infrastructure required to make it scalable and resilient. What This Role Involves

🏗️ Architecting & Building: Designing, developing, and deploying new services and features across the entire stack (React, Next.js, Node.js). ☁️ Platform Ownership: Taking ownership of the AWS infrastructure, ensuring services are scalable, reliable, and secure. 💾 Data Layer Management: Being hands‑on with databases, responsible for design, management, and optimization. 🛠️ Improving Developer Velocity: Building and maintaining the tools, CI/CD pipelines, and systems that make the entire engineering team more productive. 🤝 Collaboration: Working directly with the founders and product team to shape the technical roadmap and make critical architectural decisions.

What They’re Looking For

✅ Full Stack Proficiency: Several years of hands‑on experience building complex applications with React (or similar) and Node.js. 🚀 Modern Frontend: Deep experience with Next.js and its paradigms (SSR, SSG, ISR). ☁️ Cloud Native: Strong, practical experience with AWS. Comfortable managing infrastructure as well as applications. 🏛️ Architecture Mindset: A background in making key architectural decisions and an ability to discuss the "why" behind those choices. Someone who designs systems, not just consumes tasks. 💾 Database Knowledge: Proven experience with database management (e.g., PostgreSQL, MongoDB, DynamoDB), not just using an ORM. 💡 Start‑Up Ready: A personality that thrives in a fast‑paced environment, is comfortable with ambiguity, and is driven to take ownership.

Seniority level Mid‑Senior level Employment type Full‑time Job function Information Technology Industries Telecommunications #J-18808-Ljbffr