Détail du poste
Important information
Contract type:
Freelance
Daily rate:
Salary according to profile
Location:
Paris, France
Starting date:
Urgent
Work mode:
Onsite
Published on:
4 June 2026
What they need
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
Contract details
Freelance - long-term mission
On-site 5 days/week in Paris, near Opéra (Metro 3/8/9, RER A)
Working language: English
Profile wanted
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
Publiée le 11/06/2026 - Réf : 67b3b64e62686390f8afe28b519591cc
