Senior WebRTC Engineer — Scale Real-Time Media (Flexible Hours)

Startupvalleys; Freienbach; Hybrid; CHF 110,000 - 170,000; Full time

Benefits offered by this job

Hybrid work

Work from home 2 days/week

Unpaid leave

Choose own hardware (macOS/Linux)

Fitness room access

Monthly massage

Internal language courses

Team events

Job summary

Threema is seeking a WebRTC Engineer to own the real-time media stack across native, web, and mobile clients. You will solve challenges from large meetings to low-bandwidth screen sharing and fast join times.

This hands-on role involves designing features, digging into packet traces, and shaping architecture as we scale. Expect ownership, cross-team collaboration, and impact on privacy-preserving communication.

Qualifications

• 5+ years software engineering experience.
• At least 3 years on WebRTC or real-time media systems.
• Strong knowledge of WebRTC stack components (SDP, ICE, DTLS, SRTP).
• Experience building or operating an SFU/MCU (custom or open-source).
• Proficiency in C++, Kotlin, Go, or Rust; comfortable with TypeScript/JS.

Responsibilities

• Build and improve WebRTC media pipeline across web, desktop, and mobile clients.
• Scale SFU and signaling services for large meetings, webinars, and breakout rooms.
• Tune congestion control, bandwidth estimation, simulcast, and SVC selection.
• Own call quality end-to-end including metrics, dashboards, and traces.
• Collaborate with client, backend, security, and product teams.

Skills

WebRTC

Realtime media

C++

Kotlin

Go

Rust

TypeScript/JavaScript

Tools

SFU

mediasoup

Janus

Jitsi

Pion

LiveKit

Job description

Threema is seeking a WebRTC Engineer to own the real-time media stack across native, web, and mobile clients. You will solve challenges from large meetings to low-bandwidth screen sharing and fast join times.

This hands-on role involves designing features, digging into packet traces, and shaping architecture as we scale. Expect ownership, cross-team collaboration, and impact on privacy-preserving communication.