Vibe - Senior Backend Software Engineer
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 • 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 • At Vibe, we run on three values: Impact, Ambition, and Urgency. We tie every goal to a real business outcome, think 10x rather than settling for good enough, and move daily rather than waiting for perfect conditions. • You'll thrive here if you own outcomes without needing direction, default to action, and hold yourself to results, not effort. • This is a high-performance environment with high-performance rewards: you'll work alongside people who push you, with real ownership over hard problems in a market that's moving fast. • If that sounds like the best version of your career, we want to meet you.
Responsibilities
• Own the pacer and bidder • 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 • Raise the team's ceiling • 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 • Move at Vibe pace • 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
Benefits
• Equity — Employee Stock Ownership Plan. You're building this; you should own part of it. • 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. • Our Interview Process • We respect your time. Here's exactly what to expect — no surprises, no ghosting. • Recruiter screen — 30 min. We'll share context; you'll share yours. • Manager interview — Meet the person you'd work with directly. • Technical Coding Interview and Systems Design Interview • Calibration interview — A senior leader joins to ensure we're holding a consistent, high bar. • Offer — Fast. We don't let good decisions sit. • Reference checks — Two calls, handled with discretion. • Equal Opportunity
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