WebRTC Engineer (100%)

pThreema 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. /ph3WebRTC Engineer (100%) /h3h3The Role /h3pYou will join the team that owns our real-time media stack, including native clients, the web browser, and our SFU infrastructure. You will work on problems like keeping a 200-person meeting 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. /ppThis is a hands‑on engineering role with real ownership. You will design features, dig into packet captures when calls go wrong, and help shape the architecture as we scale. /ph3What You Will Do /h3ulliBuild and improve the WebRTC media pipeline across web, desktop, and mobile clients, including audio, video, screen sharing, and data channels /liliDevelop and scale our Selective Forwarding Unit (SFU) and signaling services to support large meetings, webinars, and breakout rooms /liliTune congestion control, bandwidth estimation, simulcast, and SVC layer selection so calls adapt gracefully to poor networks /liliOwn call quality end to end: define metrics, build dashboards, investigate issues using getStats, RTC event logs, and packet traces, and ship fixes /liliWork on NAT traversal and connectivity, including STUN/TURN infrastructure, ICE behavior, and fallbacks for restrictive corporate networks /liliCollaborate with client, backend, security, and product teams on features like recording, live captions, noise suppression, and end-to-end encryption /liliReview code, mentor other engineers, and help set technical direction for the real-time stack /li /ulh3What We’re Looking For /h3ulliMore than five years of software engineering experience, with at least three years working directly on WebRTC or other real-time media systems /liliDeep understanding of the WebRTC stack: SDP, ICE, DTLS, SRTP, and how they fit together in practice /liliExperience building or operating an SFU or MCU, whether custom or based on open-source projects such as mediasoup, Janus, Jitsi, Pion, or LiveKit /liliSolid knowledge of audio and video codecs (Opus, VP8, VP9, AV1, H.264) and their trade-offs /liliStrong skills in at least one of C++, Kotlin, Go, or Rust, plus comfort with TypeScript/JavaScript for browser-side work /liliA methodical approach to debugging distributed, latency-sensitive systems where the root cause might be the network, the device, or the code /liliClear communication and the ability to explain complex media problems to people outside the team /li /ulh3Nice to Have /h3ulliContributions to libwebrtc or open-source WebRTC projects /liliExperience with Insertable Streams / SFrame for end-to-end encrypted media /liliBackground in audio processing (echo cancellation, noise suppression, AGC) or ML-based media enhancement /liliExperience running media infrastructure on Kubernetes across multiple regions /liliFamiliarity with interoperability standards such as SIP or integrating with PSTN gateways /li /ulh3What We Offer /h3ulliA young, motivated team with straightforward communication /liliFlexible working hours, option to work from home up to two days per week /liliOption to work from anywhere for two weeks per year /liliOption to take unpaid leave /liliYou can choose your own hardware (macOS or Linux) /liliPublic transportation discount or parking space (electric car charging available) /liliFree use of fitness room, including a fitness trainer once a month /liliProfessional massage once a month /liliInternal German or English courses /liliA great coffee machine ;-) /liliRegular company events and aperitifs /liliThe good feeling of contributing to the effective protection of the privacy of millions of people /li /ulpPlace of work: Pfäffikon SZ (Greater Zurich Area) /ppStart date: Immediately or by agreement /ppWe believe that diverse teams build better products. We welcome and encourage applications from people of all backgrounds, and perspectives. Your unique experience is an asset, and we’d love to hear from you. /p #J-18808-Ljbffr