Staff Backend Software Engineer - Performance

You'll join the Performance team — the engineers who own advertiser outcomes at Vibe. Bidding, pacing, and the prediction stack that drives both. You'll report to Clément Schiano, Engineering Manager for Performance.

Responsibilities

Go deep on the bidder and pacer stack map it end-to-end and identify at least one fragility worth owning on day one; Propose improvements to the bidder or pacer autonomously from problem definition through to design proposal; Ship measurable improvements to CPx, pacing accuracy, or win rate within your first three months; Distribute critical system knowledge: make the team faster and less dependent on any single person; Challenge existing designs, including inherited ones, and push for cleaner solutions; Deepen expertise in the theoretical foundations (probabilistic modelling, PID control theory) powering our approaches; Use AI tooling as a genuine force multiplier (not a crutch, not a checkbox); Iterate in production, not in your head, we - ship, measure and adjust

Requirements

Shipped backend systems in a strongly typed language C++, Rust, Go, Scala, Java, or equivalent at production scale; Debugged distributed systems under real traffic: latency issues, consistency failures, the works; Worked inside a DSP, SSP, or bidder: you understand auction mechanics from the inside; Built or tuned pacing algorithms or PID controllers theory and implementation, not just awareness; Solid grounding in probabilistic reasoning and statistical modelling you think in distributions, not just averages

Nice to have

Experience in a scale-up environment you know what fast and resource-constrained actually feels like; ML systems in production: feature pipelines, model serving (not just training notebooks); Real-time data pipelines and low-latency architectures at scale; Redis, Kafka, or equivalent under meaningful load

Benefits

Variable pay — based on objectives you hit. No arbitrary targets.; Hybrid flexibility — We're in the heart of Paris and our team is in 3x a week!; Health insurance — Full coverage via Alan.; Meal vouchers — Via Swile.; Annual offsite — The whole team, once a year, somewhere worth the trip.; Tech Syncs — Engineering and Product meet in person at least quarterly, worldwide.