Senior Software Engineer, Frontend at Sardine in United States

Job description

• Application
• As a frontend-focused Senior Software Engineer, you will own the design and delivery of the user-facing experiences at the heart of our AI products. Your primary focus is building polished, performant, production-grade interfaces in React and TypeScript. You'll also work in Go on the backend services and APIs that power those experiences, but that's a secondary part of the role. This is a high-autonomy, high-leadership position: you'll develop new features at scale, set the standard for how we build on the frontend, mentor the engineers around you, and use AI/agentic tooling (like Claude) to ship far faster than a traditional team would. The ideal candidate pairs exceptional frontend craft with the judgment to lead and the discipline to be relentlessly efficient with modern, AI-assisted workflows.

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.
• Relevant industry experience in fintech, fraud, compliance, risk, or regulated systems is preferred.
• Proficient in English — from casual chats to formal reports.
• Exposure to data tooling or pipelines is a nice-to-have, but not required.

Skills

Required

• Expert-level React
• Expert-level TypeScript
• UX, performance, and accessibility
• Leadership and mentoring
• Technical direction and code review
• Autonomous prioritization
• Customer-centric approach
• English proficiency

Preferred

• Exposure to data tooling or pipelines

Benefits

• Generous compensation in cash and equity
• Early exercise for all options, including pre-vested
• Work from anywhere: Remote-first Culture
• Flexible paid time off and Year-end break
• Health insurance, dental, and vision coverage for employees and dependents - US and Canada specific
• 4% matching in 401k / RRSP - US and Canada specific
• MacBook Pro delivered to your door
• One-time stipend to set up a home office — desk, chair, screen, etc.
• Monthly meal stipend
• Monthly social meet-up stipend
• Annual health and wellness stipend
• Annual Learning stipend
• $145K – $195K • Offers Equity
• The compensation offered for this role will depend on various factors, including the candidate's location, qualifications, work history, and interview performance, and may differ from the stated range.