Senior Java Comms Developer

Calian Group Ltd.; Ottawa; On-site; CAD 100,000 - 130,000; Full time

Job summary

A leading technology solutions company based in Ottawa seeks a Senior Java Comms Developer with over 10 years of Java-based communications systems expertise. The role involves designing and maintaining applications for VOIP/ROIP technologies and requires deep knowledge in audio codec integration. The position offers a competitive salary, benefits, and the opportunity to work on mission-critical communication platforms in a supportive culture.

Benefits

Competitive salary

3 weeks vacation

Instant benefits

Qualifications

• 10+ years of experience in Java development.
• Experience developing distributed client/server environments.
• Strong understanding of network programming and low-level socket communication.

Responsibilities

• Design, develop, and maintain Java applications for VOIP/ROIP and digital communication systems.
• Integrate and optimize audio codecs.
• Collaborate with cross-functional teams to design secure communication solutions.

Skills

Java development

VOIP/ROIP technologies

Audio codec integration

Problem-solving

Debugging

Education

Bachelor’s degree in Computer Science, Engineering, or a related field

Tools

Open SDR (software-defined radio)

Job description

Position Overview

Calian Operational and Training Technologies Solutions (COTTS) is actively seeking a Senior Java Comms Developer with over 10 years of proven expertise in Java-based communications systems to join our Operations and Training Technology team in a full-time employee role.

This role requires deep technical confidence and advanced hands-on experience with audio codec integration, VOIP/ROIP protocols, and mission-critical communication platforms.

As a senior contributor, you will play a pivotal role in architecting, designing, developing, and enhancing highly reliable applications that support communication platforms for military and emergency service operations. Your work will directly influence the reliability, security, and real-time performance of systems deployed in demanding, high-stakes environments.

Why work for us? Competitive salary, instant benefits, 3 weeks vacation, and the trust to build your own team, plus a supportive culture that values your ideas, encourages your growth, and lets you make an impact without micromanagement.

Responsibilities

• Design, develop, and maintain Java applications for VOIP/ROIP and digital communication systems
• Integrate and optimize audio codecs (e.g., Opus, AAC)
• Implement and support SIP, RTP, and other VOIP/ROIP protocols for real-time communication
• Collaborate with cross-functional teams to design secure, fault-tolerant communication solutions
• Develop and implement features to enable interoperability with military communication systems
• Ensure scalability, low-latency performance, and high availability of communication services
• Participate in code reviews, architecture discussions, and technical planning activities
• Engage with customers to gather requirements, demonstrate features, and provide product support

Qualifications

• Bachelor’s degree in Computer Science, Engineering, or a related field
• 10+ years of experience in Java development
• Experience developing distributed client/server environments
• In-depth knowledge of VOIP/ROIP technologies (e.g., SIP, RTP, SRTP)
• Hands-on experience with audio codecs and real-time media processing
• Familiarity with radio systems, digital signal processing (DSP), and tactical communication protocols
• Strong understanding of network programming and low-level socket communication
• Excellent problem-solving, debugging, and performance optimization skills

Preferred Qualifications

• Experience developing communication software for military, defense, or emergency services
• Familiarity with Open SDR (software-defined radio)

Additional Requirements

• Must be able to work on site
• You will be able to obtain a Government Security Clearance at the Secret Level