Senior Backend Engineer

Summary

Join Cognigy, a leading AI Agent platform provider, as a Senior Backend Engineer (Voice) and contribute to impactful software solutions. Based in Düsseldorf or remotely in Germany, you will be part of a cross-functional team focused on continuous improvement and new product development. Your responsibilities include developing and deploying high-quality software, designing robust architecture and code, ensuring codebase security and reliability, optimizing performance, and implementing monitoring and testing. You will also mentor other engineers and proactively improve processes. Cognigy offers significant career development opportunities and a collaborative work environment.

Requirements

• 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
• 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

Responsibilities

• 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

Preferred Qualifications

Modern Stack Proficiency – Experience with Node.js and TypeScript is a big plus. You follow clean code principles and value maintainability

Benefits

• Attractive and performance-oriented salary
• Company Pension Scheme
• 25 days paid leave, plus 5 floating days, plus public holidays
• Unique opportunity to help build and shape the company, with little hierarchy
• Flexible working options
• Colleague recognition, reward and celebration events
• Global Employee Assistance Program
• ClassPass membership, giving you access to a variety of fitness and wellness experiences
• Ongoing learning and development opportunities, including Udemy
• One paid ‘Giving Back Day’ each year, so you can volunteer for a charity or community activity of your choice
• Subscription to the Calm app for you plus five friends/family members, giving you access to guided meditation, sleep stories, music, masterclasses, and much more