Senior AI Software Engineer - Madrid at aircall

Aircall is a unicorn AI-powered customer communications platform used by 22,000+ companies worldwide to drive revenue, faster resolutions, and scale. We’re redefining what a customer communications platform can be—by combining voice, SMS, WhatsApp, and AI into one seamless workspace. Our momentum comes from a simple but powerful idea: help every customer-facing team work smarter, not harder. Aircall’s AI Voice Agent automates routine calls, AI Assist streamlines post-call tasks, and AI Assist Pro delivers real-time guidance that helps people do their best work. The result—companies grow revenue, deliver faster resolutions, and scale service. We’ve built a product customers love and a business that scales fast. Aircall operates in nine global offices (Paris, New York, San Francisco, Sydney, Madrid, London, Berlin, Seattle, and Mexico City), and is backed by world-class investors. Our teams are shipping AI innovation faster than ever and expanding across new product lines and markets. At Aircall, you’ll join a company in motion—ambitious, profitable, and product-driven—where impact is visible, decisions are fast, and growth is real. How We Work at Aircall: At Aircall, we believe in customer obsession, continuous learning, and delivering extraordinary outcomes. We value open collaboration, taking ownership, and making smart, informed decisions with speed and precision. If you thrive in a fast-paced, team-driven environment where curiosity, trust, and impact matter, you'll fit right in We are looking for an engaged and passionate Senior AI Software Engineer to join our growing engineering department and be part of our engineering teams. As a Senior AI Software Engineer, you will be responsible for the design, development, deployment, and operation of AI driven features that add customer value. Operational excellence, metrics, observability and best practices, evangelization, and mentoring in your team and across the whole of Engineering will be part of your day to day job. Quality, excellence, and agility drive our delivery processes and you will help us level these up. Using NodeJS and Typescript back-end stacks, appropriate for each requirement, but always hosted on AWS, we build added value and resilient services on top of voice and fully integrate with our customers’ business critical tools (CRM, Helpdesk, E-Commerce, …). Key Responsibilities: • Own key responsibilities in the design, architecture, and end-to-end delivery of AI-driven modules. • Propose innovative solutions by staying ahead of AI landscape trends and emerging technologies. • Create, design, develop, test, and monitor your code in production autonomously and reliably. • Collaborate with product managers, designers and other engineers to offer pragmatic solutions to real world problems and implement them end to end. • Work with your team to design solutions and be accountable for their execution. • Obtain a good understanding of the business to provide relevant solutions to users and clients. • Mentor and promote tech growth within the teams. • Stay up-to-date on new technologies and architectures, demonstrate good judgment in their potential applications. • Participate in an on-call rotation to respond to critical system issues and ensure continuous system reliability. Our Tech Stack: • You do not need to be familiar with all of our technical stack or any specific functional area, but you have a strong willingness to learn and adapt quickly. • Typescript/Node.js, Python, REST API/GraphQL APIs, Ruby/Rails, React. • AWS/Serverless or EKS, PostgreSQL, DynamoDB, OpenSearch, Redis. A little about you: • You have at least 5+ years experience in software development, using TypeScript & NodeJS/Python/Ruby/Rails or other languages, with a focus on delivering for security, scalability, availability, and performance. • AI experience is a must for this position: Strong knowledge of LLMs and hands-on experience building with them - including usage, prompting and model integration. • Proven understanding and direct experience with Agentic AI systems, including designing, developing, and deploying AI Agents and MCP prototype/servers. • Familiarity with AI frameworks (e.g., LangChain, LlamaIndex, AutoGen) and modern AI architectures such as RAG, vector databases, reranking, and performance optimization. • Experience working on frontend applications is a big plus, preferably with React. • Nice to have: you have worked with AWS in a production environment, preferably for high volume / high availability services and understand how to design for, deploy on and get the best out of, the environment and services provided by Amazon). • Value code simplicity, quality, performance and maintainability. • Can design pragmatic & simple architectures to solve problems at scale. • You possess effective and proactive communication skills, and can collaborate with different profiles and roles. Why join us? 🚀 Key moment to join Aircall in terms of growth and opportunities 💆‍♀️ Our people matter, work-life balance is important at Aircall 📚 Fast-learning environment, entrepreneurial and strong team spirit 🌍 45+ Nationalities: cosmopolite & multi-cultural mindset 💶 Competitive salary package & benefits DE&I Statement:  At Aircall, we believe diversity, equity and inclusion – irrespective of origins, identity, background and orientations – are core to our journey.  We pride ourselves on promoting active inclusion within our business to foster a strong sense of belonging for all. We’re working to create a place filled with diverse people who can enrich and learn from one another. 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.   We are strongly committed to hiring a diverse and multicultural team and we encourage applications from traditionally underrepresented backgrounds.