Principal Software Engineer, Front End (UX/UI)

Elios AI is hiring a Principal Software Engineer to lead the front-end architecture and user experience of modernized, cloud-native applications for enterprise clients. The role involves owning React and TypeScript architecture, building accessible interfaces, integrating with backend and enterprise platforms, guiding migration to microservices, and serving as a technical lead and mentor on client engagements.

Responsibilities:

• Own front-end architecture in React 18+ and TypeScript, including component design, state management, and performance tuning
• Turn business requirements into clean, accessible, user-centered interfaces, and hold a high bar for interaction and visual detail
• Build responsive UI with HTML5 and CSS (Tailwind CSS v4 preferred)
• Connect interfaces to backend services and third-party enterprise platforms through REST and WebSocket APIs
• Serve as technical lead on client engagements, making key design decisions and assessing in-flight projects for their biggest opportunities
• Help define paths from legacy monoliths to cloud-native microservices
• Use AI development tools to move faster, validate what they produce, and coach the team to do the same
• Mentor engineers through code reviews, pairing, and hands-on coaching
• Contribute to story refinement, estimation, and the occasional pre-sales technical conversation

Requirements:

• • 10+ years building and shipping production applications from design through release
• • Expert-level React 18+ and TypeScript, with deep experience in component architecture and state management
• • A strong UX/UI eye, backed by a track record (or portfolio) of polished, user-friendly interfaces
• • Experience architecting and leading microservice-based systems in production
• • Integration experience with complex enterprise platforms via APIs
• • Quick to ramp on unfamiliar codebases, team structures, and business domains
• • Python backend experience, especially FastAPI
• • Client-facing consulting or professional services background
• • Testing with Jest and/or PyTest
• • Docker, Kubernetes (EKS), and Terraform or CloudFormation
• • AWS services such as Lambda, API Gateway, SQS, EventBridge, and DynamoDB; AWS Solutions Architect Professional certification
• • Financial services or regulated-environment experience
• • Hands-on work with LLM integrations or agentic workflows