We are seeking a **Senior Full Stack Engineer** to join a fast\-growing SaaS company. The role will strengthen existing product teams, accelerate AI readiness initiatives, and support a company\-wide rebrand implementation project. **Position:** Senior Full Stack Engineer **Location:** Central/Western Europe (CET/WET) **Contract:** B2B **Responsibilities** * Deliver end\-to\-end features across backend and frontend, with emphasis on backend. * Contribute to refactoring and modernizing systems as well as new feature delivery. * Collaborate with product, design, and research teams in a distributed environment. * Implement design updates as part of a rebranding initiative (typography, assets, UI components). **Must\-Have Skills** * 8\+ years in engineering, with proven SaaS/B2B experience. * Strong in TypeScript, Node.js, React, PostgreSQL. * Exposure to system design and scaling at enterprise or large project level. * Ability to ship high\-quality features fast. * Experience migrating legacy systems or supporting multi\-region infra is a plus. **Soft Skills** * Agentic mindset: outcome\-driven problem solver, not bound by process. * Excellent cross\-team communication in distributed environments. **What we offer:** * Competitive salary and bonuses * Flexible work hours * Remote job * Professional development opportunities * Vibrant workplace culture **Why working at Diffco?** * **Great experience and opportunity:** You will work on the fast\-forward projects in Silicon Valley utilizing the latest technologies, methodologies, frameworks and approaches with the ability and time to learn and develop professionally. * **Professional and harmonious team of friends:** Our team is a second family, so you would enjoy spending the day working on nice projects with kind people with broad interests. * **A vast field for growth:** Learn continuously, expand your skills and demonstrate your professional level and ability to take more responsibility to grow. * **Great company culture:** We care about you and are interested in your personal professional goals, motivation and we build a perfect work/life balance.