Senior Software Engineer, Frontend

Sardine is hiring a frontend-focused Senior Software Engineer to design and deliver polished, performant user-facing experiences for its AI products. The role primarily builds with React and TypeScript, contributes to Go backend services, sets frontend standards, mentors engineers, and helps shape product and engineering direction.

Responsibilities:

• Design, build, and own user-facing features in React and TypeScript — polished, accessible, performant, and production-ready
• Set the technical direction and quality bar for our frontend, and lift the people around you through mentorship and code review
• Use AI and agentic development tools (such as Claude) fluently and effectively to move quickly, and help establish best practices for AI-assisted development across the team
• Dip into Go to build and extend the backend services and APIs behind your features when needed
• Collaborate closely with business stakeholders to architect and implement new experiences from inception to delivery
• Contribute to product and technical roadmaps, and to the broader direction of the engineering team
• Craft and maintain user-facing technical documentation that drives understanding and adoption of our products
• Play a pivotal role in shaping our engineering culture and ensuring high standards across the organization

Requirements:

• 7+ years of proven experience as a software engineer, with deep specialization in frontend development
• Expert-level React and TypeScript, with a strong eye for UX, performance, and accessibility
• Demonstrated fluency with AI and agentic coding tools (e.g., Claude), and a track record of using them to ship efficiently and raise your own throughput
• Leadership experience: setting technical standards, mentoring engineers, and driving key technical decisions
• A track record of shipping high-quality, production-grade frontend at scale
• Working proficiency in Go (or the ability to become productive in it quickly) for backend services — secondary to your frontend work
• Comfort with ambiguity and the ability to prioritize autonomously against business needs
• Customer-centric approach with strong empathy toward users
• Proficient in English — from casual chats to formal reports
• Relevant industry experience in fintech, fraud, compliance, risk, or regulated systems is preferred
• Exposure to data tooling or pipelines is a nice-to-have, but not required