Profile description: Senior Fullstack Developer — Livestreaming & Interactive Broadcast Platform

Developer profile: Long-term freelance engagement on a large-scale platform engineering project. The team is building a livestreaming and interactive broadcast platform from the ground up — engineered for real-time video delivery, live chat, user interaction, and high-availability backend services at scale. Modern stack, distributed architecture, high engineering bar.

The developer will design and build responsive React (TypeScript) frontends, ship Node.js and Python backend services, implement WebSocket-based real-time features (live chat, notifications, live events), contribute to streaming infrastructure (HLS/DASH/WebRTC pipelines where applicable), and uphold quality through code reviews, testing, and documentation. Collaboration with platform architects, AI engineers, and cross-functional teams in an agile setup.

Technical requirements:

Must-haves — strict, non-negotiable:

• 8+ years professional fullstack experience

• Strong TypeScript and JavaScript (ES2020+)

• Solid Node.js backend — REST APIs, async patterns, performance optimisation

• Python for backend services or data-adjacent components

• React (TypeScript) for modern frontend development

• WebSockets and real-time application architecture

• Hands-on experience with scalable, high-traffic distributed systems (horizontal scaling, stateless services)

Nice-to-haves:

• Live video streaming protocols — HLS, DASH, WebRTC, or comparable

• Media processing tools — FFmpeg or comparable media server stacks

• Redis (caching / pub-sub); message queues (Kafka, RabbitMQ)

• Docker / Kubernetes

• Cloud — AWS, Azure, or GCP

• CDN architecture — Cloudflare, Akamai, or comparable

• German language skills (B1 or above)

• Prior work on consumer-facing, high-concurrency platforms

Required tests: Technical screening + live coding / system design exercise focused on real-time, high-concurrency scenarios. Portfolio or code samples required.

ATTENTION UPON DROPPING YOUR APPLICATION:

Please send an email sharing concrete examples of real-time and high-concurrency systems you've built or contributed to in production. We're specifically interested in:

• WebSocket-heavy features you've shipped (live chat, presence, notifications, live events)

• Streaming pipelines you've worked on (HLS, DASH, WebRTC, or comparable)

• Chat or notification infrastructure you've designed or scaled

• How you handled scale, latency, and reliability, what broke, what you fixed, what you'd do differently

Please point us to production systems, not tutorials, side experiments, or course projects.

A short paragraph per example is enough : what you built, your specific role, the scale it operated at, and one or two concrete technical decisions you made. Links to repos, demos, talks, or write-ups are welcome where you can share them.

Vague answers ("worked on WebSockets at a previous company") won't move you to the next stage , specifics will