Senior Frontend Engineer

At Sonatus, we're driving the transformation to AI-enabled software-defined vehicles. Traditional automotive software methods can't keep pace with consumer expectations shaped by the mobile industry—where features evolve rapidly, update seamlessly, and improve continuously. That's why leading OEMs trust Sonatus to accelerate this shift. Our technology is already in production across more than 6 million vehicles on the road today and rapidly expanding.

Headquartered in Sunnyvale, CA, with 250+ employees worldwide, Sonatus combines the agility of a fast-growing company with the scale and impact of an established partner. Backed by strong funding and proven by global deployment, we're solving some of the most interesting and complex challenges in the industry. Join us and help redefine what's possible as we shape the future of mobility.

We're looking for a highly skilled and experienced Senior Frontend Software Engineer based in Dublin, Ireland to join our team at the forefront of the Software Defined Vehicle (SDV) revolution. This is a high-impact role where you will help to build the web platform that serves as the backbone for our primary product lines.

The ideal candidate is a proactive problem-solver with a mastery of the React ecosystem. You won't just be writing code; you will be driving innovation and delivering the robust, scalable solutions essential to our core business strategy.

Your Impact

Reporting directly to the Senior Engineering Manager, you will take full ownership of the development lifecycle for mission-critical features. You will navigate the complexities of a highly innovative industry. If you have a proven track record of scaling complex web applications and a passion for the future of mobility, we want to talk to you.

This is a hybrid role based in our Dublin, IE office, where you will be expected to work in our office 3 days a week.

Responsibilities

• Design, develop, and maintain complex web applications with a focus on scalability, performance, and maintainability.
• Build and maintain robust, responsive frontend components and user interfaces with React.js, TypeScript, and Ant Design.
• Define and implement testing strategies, including unit, integration, and end-to-end testing.
• Work closely with Product, UX, QA, and other engineering teams to plan, build, and deliver key features.
• Translate UI/UX designs into pixel-perfect implementations, ensuring accessibility, responsiveness, and user-friendliness.
• Lead technical discussions, share knowledge, and contribute to internal engineering documentation and talks.
• Promote engineering excellence through adoption of best practices, developer tooling improvements, and continuous learning initiatives.
• Provide thoughtful and rigorous code reviews, mentoring mid-level and junior engineers to foster a culture of technical growth and high-quality standards.
• Monitor and optimize frontend performance (Core Web Vitals) and implement observability patterns to proactively identify and resolve production issues.
  
  

Requirements

• A seasoned engineer with 5+ years of experience building and scaling complex web applications.
• Strong proficiency in modern frontend technologies: TypeScript, JavaScript, React and related web development tools.
• Deep understanding of component-based architecture and state management in modern JavaScript frameworks.
• Proven ability to lead the full software development lifecycle — from architectural planning and implementation to testing, debugging, documentation, and maintenance.
• Demonstrated ability to influence product roadmap decisions by providing technical feasibility assessments and proposing alternative solutions to complex business problems.