Senior Java Comms Developer

Calian

Ottawa, Ontario

Salary: Information not available

Position Overview

Calian Operational and Training Technologies Solutions (COTTS), is actively seeking a Senior Java Developer to join our Operations and Training Technology team in a full-time employee role. This position requires deep expertise in Java-based systems, with hands-on experience in audio codec integration, VOIP/ROIP protocols, and mission-critical communication systems.

Location

Ottawa, ON

Job Type

Full Time

You will play a key role in designing, developing, and enhancing applications that support communication platforms for military and emergency services. Your work will directly impact the reliability, security, and performance of systems operating under demanding and high-stakes conditions.

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

Security clearances

A security clearance and/or vulnerable sector screening might be required for this position.
Our recruiter will walk you through the security clearance requirementand process.

We are committed to hiring military and Veteran spouses and encourage you to identify your connection with the MSEN when reaching out to us or applying to any of our open roles.

Have questions or want to learn more about us? We would love to hear from you!

Health Team

Amy Robillard

amy.robillard@calian.com

Engineering Team

Janet Abou-Chaaya

janet.abou-chaaya@calian.com

Learning Team:

Jason Keats

jason.keats@calian.com

Corporate Team

Rosanna Leblanc

rosanna.leblanc@calian.com

About Calian

Calian is a diverse Canadian company offering highly specialized solutions in four operating segments: Health, IT and Cyber Solutions, Learning and Advanced Technologies. With more than 40 years in business, Calian is known for its unwavering commitment to customer satisfaction. It's our people delivering our high-quality solutions who make the difference. We offer military veterans and their families a range of full- and part-time career opportunities. Join our team of professionals across Canada as we strive to move the world forward.

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