About the position Sutherland Bulgaria is searching for a skilled Senior VOICE Backend Software Engineer (Node.js and Java). This is a FULLY remote position and can be based anywhere in Bulgaria. If you have extensive experience developing backend services and APIs using Node.js and have strong Java & Linux proficiency we want to connect with you today! Major advantage if you have experience developing software specifically for contact centers (platform familiarity w/Genesys/Cisco or similar!)

Responsibilities

• Provide deep technical expertise in backend development, code reviews, and architectural discussions, ensuring best practices are followed.
• Design, develop, test, and deploy backend software solutions using Node.js and Java, adhering to high-quality standards.
• Architect and optimize relational database schemas, write efficient queries, and ensure data integrity and performance.
• Develop and maintain components for real-time communication, including SIP signaling and RTP streaming.
• Explore and implement solutions for audio/video media processing and integration within the contact center environment.
• Contribute to the development of contact center-specific features and integrations, understanding the nuances of the domain.
• Identify and address performance bottlenecks, ensuring the platform can scale to meet growing demands.
• Diagnose and resolve complex production issues, providing timely and effective solutions.
• Work closely with product managers, architects, QA engineers, and other stakeholders to deliver high-quality software.

Requirements

• Extensive experience developing backend services and APIs using Node.js & Java.
• Strong proficiency in Java development for backend applications.
• Deep understanding of the Linux operating system and its ecosystem for development and deployment.
• Strong foundational knowledge of relational database principles, including data modeling, normalization, ACID properties, and transaction management.
• Proficient in writing complex and optimized SQL queries.

Nice-to-haves

• Experience with PostgreSQL physical design and optimization for high-throughput and low-latency applications.
• Experience with PostgreSQL programming, including stored procedures, functions, and triggers.
• Hands-on experience with Session Initiation Protocol (SIP) for signaling in voice and video calls.
• Experience with Real-time Transport Protocol (RTP) for audio and video data streaming.
• Familiarity with other applications and technologies related to audio/video media processing and streaming.
• Experience in developing software specifically for contact center environments.
• Familiarity with major contact center platforms such as “Genesys, Cisco”, or similar.
• Experience with cloud platforms (AWS, Azure, GCP) and containerization (Docker, Kubernetes).
• Experience designing and building microservices.
• Familiarity with monitoring and logging tools (e.g., ELK stack (preferable), Prometheus, Grafana).

Benefits

• Long-term job security with a permanent contract
• Additional health and life insurance coverage
• Generous annual leave
• Food vouchers and paid breaks
• Competitive salary and clear career progression
• World-class on-the-job training