Senior Software Engineer - Full Stack

Your Mission

Cello is the Revenue Growth Infrastructure for modern digital businesses. We help teams acquire, retain, and monetize customers at scale by turning word‑of‑mouth into a systematic, measurable growth channel across user referrals, partners, and affiliates – built for the AI era.

TL;DR

• Seed, GrowthTech
• Remote‑first, Europe‑based (must be within CET +/-3 hours)
• Competitive salary + eVSOPS

Why join

• Early‑stage GrowthTech start‑up with $8.3M in funding from top‑tier investors.
• Exciting product: APIs, attribution models, recommendation engines – not your typical CRUD app.
• Real traction – 15+ new customers every month, 10M+ end users monthly.
• Small team, so you’ll genuinely shape how we build things.
• You’ll touch everything from frontend widgets to backend infrastructure to data pipelines. The work doesn’t get repetitive.
• We active...