Distributed Systems Engineer

Windmill; Paris; Sur place; EUR 60 000 - 90 000; Plein temps

Résumé du poste

Windmill is seeking a Senior Backend Developer for their Rust backend systems in Paris. This hybrid position requires extensive experience in building and operating distributed systems, deep expertise in PostgreSQL, and strong systems programming skills, preferably in Rust. The first projects will include redesigning job queues, optimizing database queries, and implementing new strategies for worker orchestration. The role offers a competitive salary of €60K–€90K gross, plus a 20% bonus based on collective milestones.

Qualifications

• Proven experience building and operating distributed systems in production.
• Deep PostgreSQL expertise in optimization and schema design.
• Strong systems programming skills, preferably in Rust.

Responsabilités

• Redesign the job queue to handle high concurrency effectively.
• Implement improved worker orchestration strategy.
• Optimize critical PostgreSQL queries and schema for efficiency.

Connaissances

Distributed systems

PostgreSQL expertise

Rust programming

Systems programming (C/C++)

Infrastructure improvement

Description du poste

Work on Windmill's Rust backend - the execution engine, workers, language runtimes, API layer, and infrastructure that powers thousands of production deployments.

Who We’re Looking For

This is a senior role. We’re looking for someone who has operated distributed systems at scale and can teach us from day one - showing us PostgreSQL patterns, distributed systems techniques, and architectural improvements we haven’t considered yet.

• Proven experience building and operating distributed systems at scale - not theoretical, you’ve done it in production
• Deep PostgreSQL expertise - query optimization, schema design, concurrency control, partitioning, replication. You know what breaks at scale and how to fix it.
• Strong systems programming skills - Rust experience strongly preferred, otherwise C/C++ with willingness to switch
• You bring opinions and techniques from previous infrastructure work that will make Windmill better immediately
• You enjoy hard infrastructure problems and care about correctness

Example projects in your first 3 months

• Redesign the job queue to handle bursty workloads with thousands of concurrent jobs without degrading scheduling latency
• Implement a new worker orchestration strategy that improves resource utilization across heterogeneous deployments (2 to 600 workers)
• Optimize critical PostgreSQL queries and schema for customers with millions of completed jobs - partitioning, indexing, vacuum tuning
• Add a new language runtime (e.g., Java, C#) with proper sandboxing, dependency management, and execution feedback
• Build observability tooling - distributed tracing across the flow execution engine to diagnose slow or failing steps in production

Offer details

Location: Paris hybrid (~3 days/week) or remote within France

Contract: CDI (permanent)

Salary: €60K–€90K gross + top of market for level + 20% bonus on collective milestones