The Senior Backend Software Engineer will enhance and optimize the Voice Squad's telephony services, manage distributed systems, and lead architectural decisions while collaborating on AI-powered communication solutions.
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, 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 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 25, Kotlin 1.9, Go
• 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:
• 7+ years in software development within product-focused companies, with at least 3+ years working extensively with Java/Kotlin/Go/C++/Erlang.
• 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
• Tech conversation with our Head of Infrastructure
• Final interview with Alexander, our Head of Software Engineering
Similar Jobs
Blockchain • Fintech • Software • Financial Services • Cryptocurrency
The Senior Back End Engineer will lead the development of a Sportsbook platform, design software solutions, improve system performance, and manage the development lifecycle.
Top Skills:
AWSCi/CdJavaKotlinSpring
Artificial Intelligence • Edtech • Productivity • Business Intelligence • Consulting
The UI/UX Designer will design intuitive B2B SaaS workflows, create prototypes, collaborate with teams, and improve product usability using user feedback.
Top Skills:
Ai-Driven CapabilitiesFigma
Artificial Intelligence • Cloud • HR Tech • Information Technology • Productivity • Software • Automation
This role involves driving AI and Data sales strategies, engaging with senior executives, and achieving sales quotas by delivering tailored solutions that transform customer operations.
Top Skills:
AIBusiness IntelligenceCloud TechnologiesDataMachine Learning
What you need to know about the Chicago Tech Scene
With vibrant neighborhoods, great food and more affordable housing than either coast, Chicago might be the most liveable major tech hub. It is the birthplace of modern commodities and futures trading, a national hub for logistics and commerce, and home to the American Medical Association and the American Bar Association. This diverse blend of industry influences has helped Chicago emerge as a major player in verticals like fintech, biotechnology, legal tech, e-commerce and logistics technology. It’s also a major hiring center for tech companies on both coasts.
Key Facts About Chicago Tech
- Number of Tech Workers: 245,800; 5.2% of overall workforce (2024 CompTIA survey)
- Major Tech Employers: McDonald’s, John Deere, Boeing, Morningstar
- Key Industries: Artificial intelligence, biotechnology, fintech, software, logistics technology
- Funding Landscape: $2.5 billion in venture capital funding in 2024 (Pitchbook)
- Notable Investors: Pritzker Group Venture Capital, Arch Venture Partners, MATH Venture Partners, Jump Capital, Hyde Park Venture Partners
- Research Centers and Universities: Northwestern University, University of Chicago, University of Illinois Urbana-Champaign, Illinois Institute of Technology, Argonne National Laboratory, Fermi National Accelerator Laboratory
