Senior Backend Software Engineer, Auxiliary Squad
Senior backend engineer on Diabolocom's Auxiliary Squad, owning core platform services (API Gateway, Authentication) and Scenario, a no-code workflow automation product for their AI-first cloud contact centre (CCaaS) platform. Stack is Java 21/25 and Kotlin with Spring Boot, PostgreSQL, RabbitMQ, and Redis on Kubernetes.
- Compensation
- Not disclosed
- Location
- Barcelona, Spain
- Work setup
- Remote
- Seniority
- Senior
- Employment
- Not specified
- Experience
- Not specified
- Category
- Backend
- Posted
Skills
Must have
- 7+ years in software development within product-focused companies
- At least 3+ years working extensively in Java
- Experience with relational databases (PostgreSQL preferred)
- Experience designing and implementing effective distributed systems; ability to make architectural decisions and evaluate their impact on performance, scalability, and reliability
- Strong autonomy and leadership potential, with willingness to grow into a lead role
- Comfortable working with and improving an existing codebase
- Strong engineering culture, attention to detail, business-centric mindset
Nice to have
- Experience with Spring Boot
Full description
About DiabolocomDiabolocom is a leading European provider of AI-first, cloud-based contact centre (CCaaS) and customer experience (CX) solutions that help companies deliver seamless, personalised customer experiences at scale. The platform combines proprietary, purpose-built AI technology for customer service, native telecom infrastructure, and deep CRM integrations to automate tasks, elevate data quality, and empower agents across all customer touchpoints. Trusted by 400+ clients, with deployments across more than 60 countries in Europe, North America, South America, and the Middle East, Diabolocom combines the agility of SaaS innovation with carrier-grade voice performance. With eight offices worldwide and more than two decades of experience, the company is committed to advancing customer loyalty and growth through sovereign, intelligent, and scalable communication technology. In the context of our exponential growth, we are strengthening our internal engineering team and opening a Senior Backend Software Engineer position in our Auxiliary Squad. About the Auxiliary SquadAuxiliary Squad is responsible for core technical services that ensure secure, high-performance access to the Diabolocom platform. The squad manages critical components such as the API Gateway and Authentication Services, which handle large volumes of traffic and serve as the entry point for all backend systems. In addition to these foundational services, the squad owns Scenario, a product that empowers users to design complex workflows through a no-code, block-based interface. Scenario enables flexible automation across a wide range of use cases, for example, scenarios for processing incoming calls, handling outgoing emails, applying AI post-processing to calls, and more. What’s next for the Auxiliary Squad?In the coming year, we plan to:• Expand Scenario’s capabilities to support new communication channels, including Facebook Messenger, Instagram, and RCS.• Integrate Scenario with various AI-powered tools to enhance automation possibilities. Technical Stack:• Languages: Java 21/25, Kotlin• Framework: Spring Boot 3.x.x• Database: PostgreSQL• Message Broker: RabbitMQ• Caching: Redis• Containerization: Docker/Kubernetes The team currently consists of:• 2 QA engineers• 3 backend developers• 1 team lead What We’re Looking For:• 7+ years in software development within product-focused companies, with at least 3+ years working extensively in Java.• Experience working with relational databases (PostgreSQL preferred).• Experience with Spring Boot would be a plus.Experience in designing and implementing effective distributed systems. Ability to make architectural decisions and evaluate their impact on system performance, scalability, and reliability.Strong autonomy and leadership potential, with a willingness to grow into a lead role.Comfortable working with and improving an existing codebase.Strong engineering culture, attention to the details, business-centric mindset. A collaborative and multicultural environment with a team that fosters professionalism, values innovation, and encourages knowledge-sharing.Work on cutting-edge distributed communication systems in a fast-growing company, with real opportunities to make an impact.Opportunities to take on new challenges and advance your career. High-quality IT equipment of your choice.Flexible work arrangements and remote work options.Regular team-building events. Intro call with a Talent Acquisition ManagerLive coding challenge conducted by one of our Senior EngineersDesign interview through screen sharing with our Lead Software EngineerFinal interview with Alexander, our Head of Software Engineering.