Senior / Principal Frontend Engineer - Remote (Europe) | B2B Contract | Up to €140,000

Senior / Principal Frontend Engineer - Remote (Europe) | B2B Contract | Up to €140,000 Our client is a fast-growing cybersecurity start-up developing cutting-edge products that help organisations protect their cloud and identity environments — essentially, antivirus for identity and access management. Their platform integrates with multiple cloud and identity sources to detect misconfigurations, highlight vulnerabilities, and provide clear visual insights into security posture. Following recent investment and steady customer traction, they are now expanding their engineering team and hiring a Senior / Principal Frontend Engineer to help accelerate product development and innovation. The RoleThis position sits within a small, high-performing engineering team and is ideal for someone who thrives in an autonomous, fast-paced environment. The successful candidate will work closely with product, backend, and design teams to transform high-level customer problems into functional product features — from concept through to delivery. The team operates with a product mindset, focusing on delivering real value quickly through LLM-assisted development and rapid iteration. This is a hands-on role with significant scope for ownership, creativity, and influence on the product direction. Key ResponsibilitiesDevelop and deliver high-quality front-end features using React and TypeScript.Collaborate with backend engineers to integrate APIs and visualise complex data structures.Use LLMs (Large Language Models) to prototype and iterate quickly while maintaining engineering best practices and reviewing generated code for accuracy.Contribute to architectural decisions and mentor other engineers in the team.Work closely with product and design stakeholders to create intuitive, high-impact user experiences. Tech EnvironmentReact, TypeScript, JavaScriptNode.js (beneficial)Graph / Visualisation libraries (e.g. Ne04j, D3, Cytoscape – advantageous)LLM-assisted development workflowsFamiliarity with cloud or identity security concepts (desirable) About YouProven experience as a Senior Frontend Engineer (or higher), ideally in startup or small-team environments.Deep expertise in React and TypeScript, with the ability to build features end-to-end.Strong product and problem-solving mindset – capable of turning abstract requirements into production-ready features.Comfortable working across the stack when needed (small backend or integration work).Experience in data visualisation, security, or developer tools is a strong plus.