Senior Backend Engineer, Taktile

• 7+ years building and owning production backend systems
• Comfort working with large datasets
• Prior industry experience with Python. Java is a plus
• Experience with AWS services and serverless architectures
• Fluency in English, both written and spoken
• Location: Berlin (hybrid setup)
• We're eager to meet talented and driven candidates regardless of whether they tick all the boxes. We're looking for someone who will add to our culture, not just fit within it. We strongly encourage individuals from groups traditionally underestimated and underrepresented in tech to apply

Desirable

• Team Optimize builds the systems that allow customers to evaluate and improve decision flows using historical data — across fraud, AML, onboarding, KYC/KYB, underwriting, and credit use cases
• As a Senior Full-Stack Engineer, you will own backend systems and APIs operating on large volumes of decision data and expose them through customer-facing product surfaces
• Your work directly impacts false positive rates, approval rates, and confidence in shipping production changes
• At scale, the systems you build will:
• Process millions of decisions per day
• Persist and query terabytes of data per day
• Execute large-scale experiments over billions of historical decisions
• Serve low-latency APIs on top of append-heavy datasets
• Build and own backend services in Python / FastAPI on AWS serverless infrastructure
• Design and evolve high-scale subsystems operating on historical decision data
• Maintain a high bar for code quality, system reliability, and delivery velocity
• Collaborate cross-functionally to translate business problems into scalable technical systems
• Operate in a high-leverage environment where AI-assisted and agentic coding are embedded into daily workflows, with access to state-of-the-art coding models and the autonomy to use them deeply while maintaining strong engineering standards