Senior Fullstack Engineer (Golang + PHP + React.js) - Freelance

Netguru is a trusted partner in digital commerce. The company helps leading brands modernize B2B solutions, marketplaces, and retail ecosystems. Since 2008, it has empowered businesses with cutting-edge technology, AI-powered personalization, and world-class engineering and design teams. A certified B Corporation®, Netguru is trusted by major brands including IKEA, VW, OLX, Delivery Hero, Żabka, Wolt, Careem, and Vinted.For our client we are looking for a Senior Fullstack Engineer with Golang, PHP and React.js.Start date: 01.04.2026End date: 27.09.2026Full-time100% remoteCET working hoursRate: up to 37.5€/hScope of the project:A critical, high-visibility CIAM (Customer Identity and Access Management) migration project. The role involves migrating the core identity solution from AWS Cognito to Auth0. The contractor will join the Identity stream to support technical execution, planning, and legacy stack migration.RequirementsMust-have:Fluent English (at least B2)React.jsGolang (Go)PHP (modern and legacy versions)Working with Legacy Monolith Architectures combined in production environmentsIdentity Experience - CIAM solutions, specificallyAuth0 and AWS Cognito (proven experience with at least one, familiarity with the other is a significant plus)Architectural Focus - Experience migrating services/functionality between legacy monoliths (PHP) and modern microservices (Golang)Nice-to-have:Ability to navigate complex, multi-stakeholder discussions and present technical findings clearly to both engineering peers and non-technical partners.Strong analytical capabilities to quickly understand complex system dependencies, legacy code, and integration requirements.Awareness of project impact on internal and external stakeholders.Understanding of user experience (UX) implications related to identity changes (e.g., login flows, password resets, registration).Proven ability to deliver high-quality work under tight deadlines and in a high-pressure environment.BenefitsIn return, we offer:100% remote, flexible work.Work with an experienced team of developers and continuous development of your hard and soft skills.Dev-friendly processes such as Continuous Integration, Continuous Delivery, Code Review and bug bashes.What will happen next?We would like to know you better, so we will invite you for a meeting with our recruiter.If everything goes well, you will meet the client at the online interviews.Looking for a full-time job? Check out our and find out more about our open recruitment processes.If you need any disability-related adaptation at any step of the recruitment process – simply let the recruiter know! We'd be happy to help.