Principal Software Engineer (Front End/Full Stack)

New York

Software Engineering

Permanent

Our client, a venture-backed AI startup, is hiring a Principal Front-End / Full Stack Engineer to join the team remotely. The successful candidate will lead the architecture and development of the user-facing platform, serve as the technical authority on front-end and middleware solutions, and guide the engineering team while shaping the overall product experience.

Responsibilities

Lead the architecture, design and implementation of their front-end platform, ensuring scalability, reliability and exceptional user experiences.
Develop high-quality, maintainable full-stack code, integrating modern front-end technologies with AI/ML capabilities.
Provide technical leadership and mentorship to the engineering team, promoting a culture of growth and best practices.
Partner with product, design, and business teams to transform user requirements into intuitive, impactful technical solutions.
Continuously enhance engineering processes, code quality, and front-end performance.

Skillset

At least 8 years of full-stack web development, including 5 years building complex front-end systems.
Proven track record architecting advanced front-end and middleware solutions.
Expertise in React, Next.js, modern CSS-in-JS and responsive design principles.
Experience integrating with back-end services and AI/ML APIs (e.g. OpenAI, Anthropic, LlamaIndex).
Comfortable translating Figma designs into functional interfaces and working with tools like Cursor or Windsurf.
Deep understanding of LLM APIs, prompt engineering, and AI workflow design.
Strong communication skills, able to explain complex technical concepts clearly.
Experience mentoring engineers, with a focus on front-end best practices.
Experience deploying AI/ML applications to cloud platforms is a plus.