• Owning the transaction monitoring part of the Crystal platform; • Improving stability and observability of the owned services; • Maintaining code to high-quality standards; • End-to-end feature design and implementation; • Coding, debugging, testing and delivering features and improvements in a continuous manner; • Providing code reviews, assistance and constructive feedback to other team members; • Performance optimizations (including database queries optimizations); • Refactoring code as necessary.

• Performance improvements, database query optimisation, and scalability enhancements; • Monitoring and observability configuration and best practices; • Managing and developing internal libraries; • Development pipeline improvements, like code coverage tooling integration, in close collaboration with the DevOps team; • Maintaining code to high-quality standards; • End-to-end feature design and implementation; • Coding, debugging, testing and delivering features and improvements in a continuous manner; • Providing code reviews, assistance and constructive feedback to other team members; • Refactoring code as necessary.

• Drive backend engineering initiatives using Node.js • Oversee architecture decisions and team development • Collaborate with frontend, DevOps, and business stakeholders • Ensure high standards of code quality and security • Support cloud architecture decisions and deployments

• Lead the design and evolution of our backend architecture (microservices, event-driven systems, AWS serverless, data pipelines) • Drive technical decisions and ensure best practices in code quality, security, and scalability • Mentor and support backend developers, reviewing code and helping them grow as engineers • Design and build robust APIs and data flows powering AI-driven language learning features • Partner with Product and Data Science teams to turn cutting-edge AI models into real-world educational experiences • Anticipate technical risks, propose solutions, and balance speed with long-term scalability