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Senior Software Engineer (Frontend-Focused)

Full-time

Sardine

About the Role:

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.

What you'll be doing:

  • 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.

What you'll need:

  • 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.

Technologies we use:

  • TypeScript ( React + Node)

  • Golang

  • Bigtable

  • Postgres / PostgreSQL

  • BigQuery

  • Python

  • Java

  • Terraform

Vacancy posted 22 days ago
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