Principal Software Engineer (Python/React) Ireland (Remote-first) I'm working with an exciting start-up in Galway who is seeking a Principal Software Engineer with deep expertise in Python and React to build intuitive, high-impact software. Principal Software Engineer (Python/React) - Key Responsibilities: Lead the design and development of full-stack applications, with a strong emphasis on React-based frontends and Python backends. Build high-performance, intuitive UIs for complex analytical and investigative workflows. Set and influence architecture, technical standards, and engineering best practices. Collaborate with product, design, and domain experts across security and investigative contexts. Provide technical leadership and mentorship, guiding engineers across multiple projects. Principal Software Engineer (Python/React) - Essential Experience: Strong professional experience with Python and Fast API on the back end. React and TypeScript on the front end. Proven ability to design and deliver scalable, production-grade full-stack systems. A passion for creating clear, usable interfaces in complex problem domains. Experience operating at a principal or lead level, balancing hands-on development with strategic technical direction. An interest in building impactful systems within security, defence, or investigative environments. Ability to operate in a start-up/scale-up environment and own/build the end-to-end system of set of features. Experience across a broad range of languages, technologies, and AI components. Principal Software Engineer (Python/React) - Key Skills: Python, React, TypeScript, Fast API, Kubernetes, Architecture Reperio Human Capital acts as an Employment Agency and an Employment Business. Skills: Python Fast API React TypeScript Kubernetes Architect Benefits: Work From Home