Senior Backend Engineer (Voice)

About Cognigy

Cognigy is transforming the customer service industry with the most advanced AI Agent platform for enterprise contact centers. Its award-winning solution, Cognigy.AI, empowers enterprises to deliver instant, hyper-personalized, multilingual service on any channel. By integrating Generative and Conversational AI to create Agentic AI, Cognigy delivers AI Agents that redefine customer experiences, drive satisfaction, and support contact center employees in real-time.

Our skilled #CognigyCrew are the people behind our cutting-edge technology and we are now looking for more talented people to join our global team.

Why you’ll love working at Cognigy - our promise to you

We empower our people to be successful as part of a diverse, passionate and respectful team who are proud to be leading the automation of conversations to make life easier for everyone.

We do this by challenging each other to succeed and being enabled to do our best work. Encouraging and supporting growth is at the heart of our success, founded on a culture of mutual respect and trust – always! It’s no wonder that the values that inspire and drive our #CognigyCrew are our 4Ts

Team, Trust, Transparency, Technology.

Your new role - Senior Backend Engineer (Voice)

Job location: On-site in Düsseldorf or remote in Germany

You will be welcomed into our Engineering department, which is divided into cross-functional, verticalized development teams, who are focused on delivering continuous improvements, features and developing new products. To support the delivery process and stability of our products, we can also count on our Product Support team, QA team, and SRE team who, alongside our Product and People team, Director/Architect and VP Engineering, are constantly looking to overcome new challenges, to innovate, and to ensure the success of our products and satisfaction of our customers.

Your responsibilities will include

• Deliver Impactful Software Solutions – Develop and deploy high-quality software that meets customer needs with speed and efficiency.
• Drive Excellence in Architecture & Code – Design best-in-class software, architecture, and code solutions while continuously seeking ways to enhance design and implementation.
• Maintain a Secure & Reliable Codebase – Ensure robust testing, security, and stability across all developments.
• Optimize Performance – Profile and benchmark the codebase to identify and eliminate bottlenecks, ensuring optimal performance.
• Ensure Operational Excellence – Implement monitoring, logging, and end-to-end testing to maintain high reliability and system health.
• Mentor & Guide – Provide technical leadership and mentorship to other engineers, fostering a culture of growth and collaboration.
• Embrace "You-Build-It-You-Run-It" – Take full ownership of your work, ensuring smooth operation and continuous improvements in both the team and the wider organization.
• Proactively Improve & Automate – Continuously refine processes, generate new ideas, and implement automation to simplify day-to-day workflows and boost efficiency.

Growth Potential

At Cognigy we are committed to your professional growth. This role offers significant opportunities for career development, including access to ongoing training, and involvement in high-impact projects allowing you to showcase and advance your unique skills and experience.

About you 

• Experienced Backend Developer – You bring 5+ years of hands-on experience in backend software development, with a strong focus on building scalable, high-performance systems.
• Linux Native – Comfortable navigating and working in Linux-based environments; the terminal is your natural habitat.
• Real-Time Communication Know-How – You’ve built applications using WebRTC or SIP and understand the intricacies of real-time communication protocols. Experience with FreeSWITCH is a plus.
• Low-Level Programming Skills – You’re confident writing in low-level languages like C++, especially when performance and resource optimization are key.
• Modern Stack Proficiency – Experience with Node.js and TypeScript is a big plus. You follow clean code principles and value maintainability.
• Network Analysis Skills – You know how to monitor and analyze network traffic, particularly for SIP-based communication, and can troubleshoot complex issues.
• Database Versatility – You're familiar with relational and NoSQL databases like PostgreSQL, MongoDB, and Redis.
• Cloud Savvy – Exposure to cloud platforms, ideally Microsoft Azure or AWS, with an understanding of how to build and scale cloud-native apps.
• Curious & Evolving – You're always learning, open to new languages and frameworks, and driven to improve your craft.
• Collaborative & Communicative – Whether mentoring teammates or proposing technical solutions, you communicate clearly and work well across teams.