Full Stack A / V Engineer Spain

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 :

Preferences :

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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