Senior Fullstack Developer

Do you enjoy building products end-to-end and making complex systems feel reliable, useful, and easy to work with? Effektify is now looking for a Senior Fullstack Developer to build and improve a platform that turns marketing, e-commerce, and business data into clearer insights and better decisions. About the role In this role at Effektify, you will work across both frontend and backend, with a bit more weight on the backend, data, and cloud side of the product. You will build features that span the full chain — from APIs, databases, integrations, and business logic to product flows in React, TypeScript, and Next.js. A big part of the role is making sure the platform is not just feature-rich, but stable, scalable, and easy to keep developing over time. You will work closely with Martin, our CTO, and the broader tech team, most of which is based in Halmstad. Since the team is still relatively small, you will have broad ownership and a real chance to shape both technical decisions and the product itself. What you will work on Your work will include a mix of: Building product features end-to-end across frontend, backend, and data flows Developing and improving APIs, backend logic, and integrations between different data sources Working with databases such as PostgreSQL and MySQL Building and refining product experiences in React, TypeScript, and Next.js Improving structure, performance, and maintainability across the stack Working close to cloud and infrastructure-related parts of the platform as the product grows Using modern AI tools in development to move faster, test ideas, and improve implementation quality Examples of projects and focus areas In the first phase, your work may include areas such as: End-to-end product features for connected data Build features that bring together data from ad platforms, e-commerce systems, analytics tools, and business systems — and make that data useful in the product. Backend and integration work tha