Senior Full Stack Software Engineer

We are looking for a Senior Software Engineer to join an international project focused on migrating a Customer Identity and Access Management (CIAM) solution from AWS Cognito to Auth0. This role combines hands-on engineering work with architectural involvement in a complex, high-impact environment. Responsibilities • Implement and support the migration of CIAM solutions from AWS Cognito to Auth0 • Develop and maintain backend services using Golang and PHP (both modern and legacy codebases) • Contribute to frontend development using React where needed • Work with legacy monolithic systems and support their transition to microservices architecture • Analyze existing systems, integrations, and dependencies to identify risks and migration requirements • Participate in technical design discussions and help shape the migration strategy • Break down complex tasks and support planning and execution across the team • Collaborate with cross-functional teams and communicate effectively with both technical and non-technical stakeholders Requirements • 5+ years of commercial experience in software development • Strong experience with Golang and PHP (including legacy systems) • Solid knowledge of JavaScript and hands-on experience with React • Experience working with Auth0 or AWS Cognito (ideally both) • Understanding of CIAM / authentication and authorization concepts • Experience working with microservices architecture and legacy monoliths • Proven track record in system migrations or working in complex distributed environments • Strong analytical and problem-solving skills • Ability to work in a fast-paced environment with tight deadlines • Good communication skills and ability to collaborate with cross-functional teams