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WebRTC Engineer – Freienbach | JobRevolt

Über den Job

Threema is the world's best-selling secure messenger for private users and businesses. You'll join the team that owns the real-time media stack, including native clients, web browser and SFU infrastructure. You'll work on problems like keeping 200-person meetings stable when half the participants are on hotel Wi-Fi, getting screen sharing to stay crisp at low bandwidth, and cutting join times so a meeting starts the moment someone clicks the link.

Aufgaben

Build and improve the WebRTC media pipeline across web, desktop and mobile clients, including audio, video, screen sharing and data channels
Develop and scale the 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

Profil

5+ years of software engineering experience, with at least 3 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, 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
Contributions to libwebrtc or open-source WebRTC projects (nice to have)
Experience with Insertable Streams / SFrame for end-to-end encrypted media (nice to have)
Background in audio processing (echo cancellation, noise suppression, AGC) or ML-based media enhancement (nice to have)
Experience running media infrastructure on Kubernetes across multiple regions (nice to have)
Familiarity with interoperability standards such as SIP or integrating with PSTN gateways (nice to have)

Rahmenbedingungen

100% position
Start date: Immediately or by agreement
Location: Pfäffikon SZ (Greater Zurich Area)
Apply via the official "Apply" button – applications sent via email cannot be considered

Benefits

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
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 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

WebRTC Engineer

Über den Job

Über den Job

Aufgaben

Profil

Rahmenbedingungen

Benefits

Skills

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