Senior Software Engineer – Growth & Onboarding Madrid Office Aircall is a unicorn, AI-powered customer communications platform used by 22,000+ companies worldwide to drive revenue, resolve issues faster, and scale customer-facing teams. We're redefining customer communications by bringing voice, SMS, WhatsApp, and AI together into one seamless workspace. Aircall is headquartered in Paris, our European HQ, with a strong North American presence anchored in Seattle, our North American HQ, and teams across Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City.

We've built a product customers love and a business that's scaling quickly, backed by world-class investors and driven by rapid AI innovation across multiple product lines. At Aircall, you'll join a company in motion. We're customer-obsessed, data-driven, and focused on delivering meaningful outcomes.

We are looking for a Senior Software Engineer to join our Growth team, with a particular focus on optimizing onboarding and trial experiences. You will work closely with Product, Design, and Data to identify friction points, test new ideas, and turn user insights into intuitive product experiences. Although this is a full-stack position, it has a strong emphasis on Frontend development.

You will build user-facing experiences, run rapid experiments, and play an important role in shaping the beginning of the customer journey at Aircall. Develop complex, responsive, and intuitive user interfaces using modern Frontend technologies. Build and maintain the Backend logic and API integrations required to support seamless product experiences.

Create, launch, and evaluate A/B tests and product variations to improve activation, adoption, and conversion. Take end-to-end ownership of projects,



from technical design and implementation through release, monitoring, and optimization. Partner closely with Product Managers, Product Designers, Data Analysts, and other Engineers to translate user insights into effective solutions.

Contribute to technical decisions and help improve the quality, scalability, and maintainability of the product. Move quickly while maintaining a high standard of engineering quality and user experience. Significant professional experience as a Full-Stack or Software Engineer, with hands-on contributions across both Frontend and Backend development.

Deep Frontend expertise, including experience building complex UI components, reactive interfaces, and modern web applications.

Experience designing and integrating APIs and developing the Backend services needed to support user-facing functionality. Familiarity with product analytics, conversion funnels, experimentation, and data-informed decision-making. Strong collaboration and communication skills, particularly when working with Product, Design, Data, and Engineering stakeholders.

Please note that this position involves substantial Frontend work. Candidates whose experience is primarily limited to Ruby, Python, or Backend development are unlikely to match the needs of this role.

Experience working in a product-led SaaS company. Previous experience in Growth Engineering or a similar product-focused engineering team.

Experience designing and implementing A/B tests or other rapid experimentation frameworks. We're committed to ensuring that everyone not only has a seat at the table but is valued and respected at it by providing equal opportunities to develop and thrive. If you would like more information about how your data is processed, please contact us.

📌 Senior Software Engineer FullStack (Madrid)
🏢 Aircall.io
📍 Madrid