Senior Software Engineer (JavaScript, CSS, HTML5, WebGL)

We are looking for a Senior Software Engineer with strong fundamentals in software development and architecture. A solid background in mathematics (geometry and linear algebra) and experience with WebGL is a plus.

Requirements

• University degree in Computer Science, Engineering, Mathematics, or related field.
• At least 5 years of professional software development experience.
• Deep expertise in vanilla JavaScript, CSS, and HTML5.
• Experience building complex browser-based tools or libraries from scratch.
• Strong understanding of web technologies, browser behavior, performance, and layout/rendering.
• Solid mathematical foundation (e.g., geometry, linear algebra) and familiarity with WebGL is a plus.
• Excellent communication and collaboration skills.
• English level B2 or higher.

Benefits

• 100% remote work from anywhere in Spain
• Flexible hours (8-hour workday; 7 hours in August)
• Competitive salary
• Optional benefits including restaurant vouchers, Caser Seguros discounts, etc.
• Autonomy to lead technical design on complex systems
• Ongoing learning and personal development support