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We are the Revenue Growth Infrastructure for digital businesses to acquire, retain, and monetize customers - at scale in the AI era. Cello turns word-of-mouth into a systematic growth channel.

Our referral platform allows users and affiliates to share and discover any software product with only a few clicks. By inspiring users to share the products they love, we are virtually reinventing how companies sell and market products. Category leaders including Typeform, Miro and Veed trust Cello to accelerate their growth flywheel.

We’ve raised $10.3M total funding led by top-tier investors, and we’re now looking for a Senior Platform Software Engineer (m/f/x) to help us realize our committed vision.

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TL;DR

🌱 Seed, GrowthTech

🌎 Remote-first, Europe-based (must be within CET +/-3 hours)

🍰 Competitive salary + eVSOPS

🚀 Why join

• AI-powered infrastructure company with $10.3M in funding from top-tier investors.
• Exciting product: APIs, attribution models, MCP integration, AI-based recommendation engines, and assistants - not your typical CRUD app.
• Real traction: 30+ 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 actively learn about new tech and AI tools and adopt where we can — we have to, because our customers do.
• Remote-first, but we get together regularly - company-wide and as an engineering team.
• The founding team consists of serial founders and experienced big-tech operators from Twilio, Wise, and Skype.

🌟 What We’re Building

We help SaaS companies turn their users and partners into a sales channel through referrals, sharing, and recommendations - 10M+ end users interact with our system every month.

Our widgets live inside customer products, which means your code runs in environments you don't control. On top of that: APIs that customer developers integrate against, and a portal where customers manage their campaigns and analytics.