Senior Fullstack Software Engineer

In this role you will contribute to a performance-critical SaaS platform by building scalable back-end services and supporting a real-time data engine. You will work closely with front-end and product teams to deliver impactful features that help clients plan and perform with confidence. The position offers hands-on ownership of architecture decisions, focusing on reliability, scalability, and data-driven decisions. You’ll operate in a collaborative, growth-minded environment that values curiosity and impact, with a clear opportunity to shape the product at scale.

• Competitive salary
• Equity
• Health insurance (Alan Blue) for you and family
• Trust and flexible working hours
• Brand new offices in Paris, London, New York, Toronto

• Design and optimize the proprietary formula and query engine
• Address scalability and performance challenges for high-volume real-time data
• Collaborate with frontend engineers and product managers to deliver features
• Build and maintain backend services using .NET Core, PostgreSQL, React, and GCP
• Drive architecture decisions and continuously improve performance and reliability
• Contribute to the full application development lifecycle and production readiness

• Proven OO software design experience with C#, Java, C++, Golang, Rust, Python or Ruby
• Proven experience with JavaScript, CSS and frameworks such as React, Vue.js or Angular
• Strong problem-solving ability and team player mindset
• Humility and willingness to grow regardless of seniority
• Fluent English (French not required)

• Great team spirit
• Problem-solving attitude
• Humility
• C# and .NET Core
• Linux
• React and TypeScript