Senior Software Engineer, Core Experiences

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Software Engineer, Core Experiences based in Spain.

This role offers the opportunity to build foundational technology that powers a widely used audio information platform.
You will design and improve core systems, SDKs, and backend services that enhance product experiences across multiple platforms.
The position combines software architecture, product thinking, and infrastructure expertise to solve complex engineering challenges.
You will collaborate with product teams to deliver simple, reliable, and scalable solutions that directly impact users.
This is an opportunity for a senior engineer who values ownership, speed, and thoughtful system design in a high-growth environment.
You will contribute to technology that helps millions of people access, learn, and engage with information more effectively.

As a Senior Software Engineer, Core Experiences, you will design, develop, and maintain the foundational systems that support product experiences across platforms. You will work at the intersection of product and infrastructure, creating reliable APIs, SDKs, and services while collaborating closely with cross-functional teams.

• Partner with Product teams to define technical solutions, reduce project scope where appropriate, and deliver impactful features quickly.
• Build and maintain cross-platform SDKs and foundational services that support seamless user experiences.
• Design and improve backend services, cloud functions, and lightweight systems using modern engineering practices.
• Optimize existing functionality by improving algorithms, abstractions, performance, and system reliability.
• Develop solutions that enable faster loading, intelligent content processing, and improved product performance.
• Evaluate technical trade-offs across different product requirements, integrations, and user experience considerations.
• Contribute to system architecture decisions with a focus on simplicity, scalability, and long-term maintainability.
• Collaborate effectively with designers, product managers, engineers, and other stakeholders to deliver high-quality solutions.
• Participate in a fast-paced engineering environment by balancing speed, quality, experimentation, and sustainable development practices.

Requirements

The ideal candidate is a senior software engineer with strong systems thinking, product awareness, and experience building reliable software solutions. You should be comfortable working independently, collaborating across teams, and making thoughtful technical decisions in a fast-moving environment.

• Strong professional experience building and maintaining software applications and core engineering systems.
• Experience designing scalable architectures, APIs, SDKs, and backend services.
• Strong proficiency in Kotlin, with Kotlin Multiplatform experience preferred; Java experience is also considered relevant.
• Experience working with cloud environments; familiarity with Google Cloud Platform (GCP) is a plus.
• Strong understanding of system design, performance optimization, and software engineering best practices.
• Ability to analyze complex technical challenges and create simple, effective solutions.
• Experience improving application performance, reliability, and maintainability.
• Strong ownership mindset with the ability to independently drive projects from concept to completion.
• Ability to work effectively in a remote, asynchronous environment.
• Excellent collaboration and communication skills, with the ability to work with technical and non-technical stakeholders.
• Ability to move quickly, prioritize effectively, and balance immediate delivery with long-term technical quality.

Benefits

• Opportunity to work on a rapidly growing product used by millions of people worldwide.
• Fully remote work environment with flexibility and asynchronous collaboration.
• Competitive salary package.
• Opportunity to contribute to technology at the intersection of artificial intelligence and audio innovation.
• High-impact role with ownership over core product experiences and foundational systems.
• Entrepreneurial culture that encourages experimentation, initiative, and creative problem-solving.
• Supportive team environment with autonomy and minimal bureaucracy.
• Opportunity to build products that support accessibility and help people with learning differences.
• Chance to work alongside talented engineers and product professionals in a fast-growing technology sector.
• Flexible working approach focused on outcomes rather than hours worked.