As a Senior Software Engineer at Performativ, you’ll lead the design and implementation of robust, high-throughput APIs and backend systems. Everything we build is grounded in open web standards - HTTP, JSON, webhooks, OpenAPI - and built for scale, reliability, and clear interoperability. You’ll work on the core systems that power mission-critical financial infrastructure for institutions across Europe.

• Design and implement modern, standards-based APIs using REST and OpenAPI specifications
• Build scalable backend systems that handle millions of HTTP/JSON transactions daily with low latency
• Develop and maintain secure, event-driven integrations via webhooks and callback mechanisms
• Lead the backend design of new products and services, ensuring interoperability and long-term maintainability
• Optimize for resilience, observability, and fault-tolerant behavior across distributed cloud systems
• Deploy infrastructure using AWS CDK and build with modern tools like Golang, TypeScript, Python, and PHP
• Ensure clean interface contracts and clear documentation for client developers
• Collaborate across engineering, product, and security to deliver business-critical functionality
• Mentor engineers and help define backend engineering standards across the team
• Continuously improve performance, security, and scalability of the core API platform