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Atarus Linkedin · Posted 2mo ago

Senior Software Engineer - Backend

London, Westminster, United Kingdom

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🚀 Senior Backend Engineer – FinTech


We’re working with a fast-growing B2B FinTech building billing infrastructure for modern companies.


Small team, high ownership, and real impact, you’ll shape both the product and core architecture.


What You’ll Work On 👇

• Build end-to-end product features used daily

• Develop AI-powered workflows for approvals and collections

• Design systems handling high-volume event streams

• Scale billing infrastructure to handle 10x growth

• Own revenue-critical systems where reliability matters


What You’ll Need 🧠

• Strong backend experience across any language and be happy to work with Kotlin moving forwards

• Experience with distributed systems

• Focus on reliability and performance

• Comfortable in fast-moving, ambiguous environments


Tech ⚙️

• Kotlin, Postgres, GCP

• Event-driven systems

• React, TypeScript


Why It’s Interesting 💡

• Revenue-critical infrastructure

• Real ownership in a small team

• Strong mix of product + deep engineering challenges

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