Full Stack A/V Engineer

Mattermost; United Kingdom; Remote; GBP 80,000 - 100,000; Full time

Job summary

A technology company in the United Kingdom is seeking an exceptional Software Engineer to lead the development of conferencing capabilities using audio/video streaming technologies. The role requires strong expertise in WebRTC, a solid understanding of networking fundamentals, and the ability to work collaboratively with technical teams. This is a unique opportunity to innovate within a remote-first work environment.

Benefits

Remote-first work environment

Open-source contributions

Flexible working hours

Qualifications

• 5+ years of experience developing production audio/video streaming applications with demonstrated expertise in WebRTC.
• Strong networking fundamentals including UDP/TCP protocols, NAT traversal, STUN/TURN servers, and network optimisation.
• Proven ability to architect and implement SFU/MCU media servers.

Responsibilities

• Design and implement scalable audio/video conferencing solutions using WebRTC and Media over QUIC.
• Lead the strategic evolution of Mattermost's audio/video capabilities.
• Collaborate directly with customer technical teams to understand deployment requirements.

Skills

Expertise in audio/video streaming technologies

Networking fundamentals

Problem-solving skills

Excellent communication skills

Education

BSc in Computer Science, Computer Engineering, or related field

Tools

Go

TypeScript

React

Job description

At Mattermost, we build the #1 collaborative workflow solution for defense, intelligence, security, and critical infrastructure organizations. Trusted by governments, financial institutions, and technology companies, our platform enables secure, efficient operations for the world’s most critical teams.

We’re dedicated to empowering organizations to operate with confidence, reducing risks, and accelerating productivity. Guided by our core values of Customer Obsession, Earn Trust, Self Awareness, Ownership and High Impact, we collaborate closely with our customers to deliver solutions that meet complex needs and drive success.

Mattermost is seeking an exceptional Software Engineer with deep expertise in audio/video streaming technologies to lead the development of next-generation conferencing capabilities on our platform. You'll be at the forefront of building and scaling real-time communication solutions that serve mission-critical organisations in defence, intelligence, and critical infrastructure sectors where reliable, secure, and high-quality audio/video collaboration is essential.

As our audio/video expert, you'll architect and implement cutting-edge streaming solutions using WebRTC, Media over QUIC, and other emerging web media technologies. This role combines deep technical expertise with product vision—you'll not only build robust A/V systems but also shape the strategic direction of Mattermost's conferencing platform. Whether extending our existing audio calls product or integrating with third-party platforms like LiveKit, your work will directly impact how the world's most critical organisations communicate and collaborate.

This is a unique opportunity to join a fast-paced, globally distributed team where your expertise in real-time media streaming will drive innovation across our entire technology stack. You'll work closely with customers' technical teams to solve complex deployment challenges while mentoring fellow engineers and contributing to one of the largest open-source collaboration platforms.

Responsibilities Include

• Design and implement scalable audio/video conferencing solutions using WebRTC, Media over QUIC, and other modern streaming protocols
• Architect full-stack A/V systems spanning frontend media handling, backend streaming infrastructure, and network optimisation
• Lead the strategic evolution of Mattermost's audio/video capabilities, evaluating and potentially integrating third-party platforms like LiveKit
• Collaborate directly with customer technical teams to understand deployment requirements, troubleshoot complex networking issues, and optimise performance
• Develop robust media streaming backends using Go, including SFU/MCU implementations, media processing pipelines, and real-time data handling
• Build responsive frontend experiences with TypeScript and React for seamless audio/video interactions across web and mobile platforms
• Contribute to open-source media streaming solutions through Mattermost's GitHub platform, advancing the broader developer ecosystem
• Implement comprehensive testing strategies for real-time media systems, including network simulation and performance benchmarking
• Optimise streaming performance across diverse network conditions and security constraints typical in defence and enterprise environments
• Mentor engineering team members on media streaming best practices and emerging A/V technologies
• Work with product managers and designers to translate complex technical capabilities into intuitive user experiences

Requirements

• BSc in Computer Science, Computer Engineering, or related field/experience with focus on networking, media systems, or distributed computing
• 5+ years of experience developing production audio/video streaming applications with demonstrated expertise in WebRTC
• Deep understanding of modern web media technologies including Media over QUIC, WebCodecs, WebTransport, and emerging streaming standards
• Strong networking fundamentals including UDP/TCP protocols, NAT traversal, STUN/TURN servers, and network optimisation techniques
• Experience building scalable real-time systems with technologies like Go, TypeScript, React, and PostgreSQL
• Proven ability to architect and implement SFU/MCU media servers and handle complex multi-stream scenarios
• Strong problem-solving skills for debugging network connectivity issues, media quality problems, and performance bottlenecks
• Experience working directly with technical customers to gather requirements, resolve deployment issues, and optimise system performance
• Excellent communication skills for explaining complex technical concepts to diverse audiences including customer technical teams
• Ability to work independently across multiple time zones while maintaining strong collaboration with global team members

Preferences

• Experience with third-party A/V platforms such as LiveKit, Agora, Twilio Video, or similar WebRTC-based solutions
• Contributions to open-source projects
• Experience with cloud infrastructure platforms (AWS, GCP, Azure) and container orchestration for media streaming workloads
• Has worked fully remotely with global teams
• Expertise in defence, intelligence, or security-focused workflows

Mattermost takes a market-based approach to pay and pay may vary depending on your location. The successful candidate’s starting pay will be determined based on job-related skills, experience, qualifications, work location, and market conditions. These ranges may be modified in the future.

Mattermost is an EEO Employer, We are a remote-first, open-source company.

We are continually working to expand our hiring in more countries and regions, ensuring compliance with local laws and regulations, which takes time.

Mattermost values your unique perspective—we welcome all applicants. We encourage individuals from all backgrounds to apply and are committed to assessing candidates based on their skills and qualifications. We do not tolerate discrimination against staff or applicants based on race, religion, national origin, age, disability, pregnancy status, veteran status, or other personal characteristics.

If you require accommodations during the interview process, please let us know—we’re happy to assist.

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