Senior Backend Software Engineer, Voice Squad

About Diabolocom Diabolocom 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 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.

Senior Backend Software Engineer In the context of our exponential growth, we are strengthening our internal engineering team and opening a Senior Backend Software Engineer position in our Voice Squad.

About the Voice Squad Voice Squad is the software core of our CCaaS telephony. It is responsible for the core technical services that ensure secure, high-performance processing of phone calls on the Diabolocom platform. It manages critical components related to call routing, media stream handling and other voice related services.

Voice provides information to all parts of the system to help our clients observe agents and their business in general.

What’s next for the Voice Squad? In the coming year, we plan to:

Introduce Telephony as a Service

that will be part of Omni-channel as a Service.

Perform massive optimization and refactoring to enable faster feature delivery.

Technical Stack

Languages: Java 21/25, Kotlin

Framework: Spring Boot 3.x.x

Database: PostgreSQL

Message Broker: RabbitMQ

Caching: Redis

Containerization: Docker

The team currently consists of:

3 QA engineers

5 backend developers

1 team lead

What We’re Looking For:

10+ years in software development

within product-focused companies, with at least

5+ years

working extensively in

Java .

Experience working with relational databases (PostgreSQL preferred).

Proficiency in

VoIP

protocols (SIP, (S)RTP, WebRTC).

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.

What We Offer:

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.

Recruitment Process:

Intro call with a Talent Acquisition Manager

Live coding challenge

Design interview through screen sharing with our Lead Software Engineer

Final interview with Alexander, our Head of Software Engineering

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