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 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.

Location

Ottawa, ON

Job Type

Full Time

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

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 ommitted 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!

A.Robillard@calian.com

Whenever possible, reach out to a named contact rather than a general inbox - it helps ensure a quicker, more personalized response. If you hit a bounce-back, let us know at

employment.Emploi@cfmws.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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