Senior Backend Engineer (RUST) – Freelance - Freelance H/F
collectivework
Paris
Temps plein
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Job description
Context
Our client is a Parisian scale\-up building a high\-growth consumer social app, with a highly international team (68% non\-French profiles). We're looking for a senior Backend freelancer to join the product team as a full contributor, with real technical ownership over critical components.
The Backend team handles both server\-side development and the shared network/sync layer between iOS and Android (written in Rust). One team, both ends of the same data.
What you'll do
- Build systems designed for massive traffic and horizontal scalability
- Contribute to a shared Rust component for iOS/Android (networking, data sync, feature logic)
- Collaborate with iOS and Android engineers to maintain a unified cross\-platform experience
- Join feature brainstorming and design sessions
- Own your scope: monitor analytics, manage incidents, drive bug fixes
- Freelance – long\-term mission
- On\-site 5 days/week in Paris, near Opéra (Metro 3/8/9, RER A)
- Working language: English
Requirements
What we're looking for
- Production experience with Rust, or strong background in C\+\+, C, or OCaml
- Hands\-on with distributed systems in prod (Kafka, Redpanda, ScyllaDB, Cassandra, or similar)
- Strong instincts about consumer social products — what makes them work, what makes them fail
- Autonomous, ownership\-driven, feedback\-oriented
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