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Senior Backend Engineer

Aircall Inc.

Job Overview

Location

Madrid Office

Job Type

Full-time

Full Job Description

📋 Description

• Design, develop, deploy, and operate business-critical backend features that enhance customer value on top of voice communication capabilities.
• Build resilient, scalable services on AWS that integrate seamlessly with customers’ business-critical tools including CRM, Helpdesk, and E-Commerce platforms.
• Apply best practices in backend engineering across multiple technology stacks, selecting the most appropriate tools for each specific requirement.
• Own end-to-end delivery of features from concept to production, ensuring high quality, reliability, and performance in a fast-moving environment.
• Evangelize and mentor engineering teams on backend best practices, code quality, and architectural excellence across the entire Engineering organization.
• Contribute to continuous improvement of delivery processes by promoting agility, ownership, and data-driven decision-making.
• Collaborate closely with cross-functional teams to translate customer needs into technical solutions that drive revenue, improve resolution speed, and scale customer-facing operations.
• Leverage Aircall’s AI-powered capabilities—including AI Voice Agent, AI Assist, and AI Assist Pro—to enhance backend systems that automate routine calls and provide real-time guidance.
• Operate in a customer-obsessed, execution-focused culture where rapid iteration, visible impact, and thoughtful speed are prioritized.
• Participate in on-call rotations and operational responsibilities to ensure system reliability and rapid incident response for mission-critical services.
• Maintain and evolve backend infrastructure that supports voice, SMS, WhatsApp, and AI integrations within a unified customer communications workspace.
• Work within a globally distributed engineering team with strong presence in Madrid, Paris, Seattle, London, Berlin, San Francisco, New York City, Sydney, and Mexico City.
• Embrace a culture of continuous learning, trust, and ownership, where decisions are made quickly and impact is measurable.

🎯 Requirements

• Proven experience as a Senior Backend Engineer with a strong track record in designing and operating scalable, high-availability systems
• Expertise in building and maintaining backend services on AWS
• Experience integrating backend systems with external business-critical tools such as CRM, Helpdesk, and E-Commerce platforms
• Deep understanding of backend architecture and ability to select appropriate technology stacks for specific use cases
• Demonstrated ability to mentor engineers and evangelize engineering best practices across teams
• Strong ownership mindset with experience in end-to-end feature delivery and operational responsibility

🏖️ Benefits

• Opportunity to work on AI-powered customer communications technology used by 22,000+ companies worldwide
• Collaborative, fast-moving environment focused on impact, ownership, and continuous learning
• Exposure to cutting-edge AI features including AI Voice Agent, AI Assist, and AI Assist Pro
• Global team with offices in Madrid, Paris, Seattle, London, Berlin, San Francisco, New York City, Sydney, and Mexico City

Skills & Technologies

AWS

Backend

Senior

Onsite

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Aircall Inc.

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About Aircall Inc.

Aircall provides cloud-based phone systems for businesses, integrating voice, SMS, and call analytics with CRM and helpdesk tools like Salesforce and HubSpot. Its platform supports remote teams, scalable call centers, and real-time analytics, enabling companies to manage customer interactions without on-premise hardware. Founded in 2014, the company serves mid-market and enterprise clients across North America and Europe, emphasizing ease of deployment, API customization, and AI-driven insights to improve support and sales workflows.

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