WebRTC Engineer
Churerstrasse 82, 8808 Pfäffikon SZ · IT-Sicherheit, Kryptographie · Secure messaging software · 60 · Deutsch
Wer wir sind
Threema is the world’s best-selling secure messenger for both private users and businesses. Since 2012, we have been working tirelessly to ensure that our users can communicate freely without worrying about their privacy. Our growing user base includes millions of private customers and thousands of businesses and organizations from all over the world.
- A young, motivated team with straightforward communication
- Flexible working hours, option to work from home up to two days per week
- Option to work from anywhere for two weeks per year
- Option to take unpaid leave
- You can choose your own hardware (macOS or Linux)
- Public transportation discount or parking space (electric car charging available)
- Free use of fitness room, including a fitness trainer once a month
- Professional massage once a month
- Internal German or English courses
- A great coffee machine ;-)
- Regular company events and aperitifs
- The good feeling of contributing to the effective protection of the privacy of millions of people
What You Will Do
- Build and improve the WebRTC media pipeline across web, desktop, and mobile clients, including audio, video, screen sharing, and data channels
- Develop and scale our Selective Forwarding Unit (SFU) and signaling services to support large meetings, webinars, and breakout rooms
- Tune congestion control, bandwidth estimation, simulcast, and SVC layer selection so calls adapt gracefully to poor networks
- Own call quality end to end: define metrics, build dashboards, investigate issues using getStats, RTC event logs, and packet traces, and ship fixes
- Work on NAT traversal and connectivity, including STUN/TURN infrastructure, ICE behavior, and fallbacks for restrictive corporate networks
- Collaborate with client, backend, security, and product teams on features like recording, live captions, noise suppression, and end-to-end encryption
- Review code, mentor other engineers, and help set technical direction for the real-time stack
What We’re Looking For
- More than five years of software engineering experience, with at least three years working directly on WebRTC or other real-time media systems
- Deep understanding of the WebRTC stack: SDP, ICE, DTLS, SRTP, and how they fit together in practice
- Experience building or operating an SFU or MCU, whether custom or based on open-source projects such as mediasoup, Janus, Jitsi, Pion, or LiveKit
- Solid knowledge of audio and video codecs (Opus, VP8, VP9, AV1, H.264) and their trade-offs
- Strong skills in at least one of C++, Kotlin, Go, or Rust, plus comfort with TypeScript/JavaScript for browser-side work
- A methodical approach to debugging distributed, latency-sensitive systems where the root cause might be the network, the device, or the code
- Clear communication and the ability to explain complex media problems to people outside the team
Fähigkeiten
C++
Rust
TypeScript
Kotlin
Go
JavaScriptGehaltsspanne
Auf AnfrageDieser Arbeitgeber nennt die Gehaltsspanne im ersten Gespräch.
Kontakt
Applications sent via email cannot be considered. Please use the official “Apply” button below so we don’t accidentally miss your resume in our crowded inboxes. For agencies: we are filling this role directly and do not accept unsolicited candidate profiles.
