Full Stack Engineer

Full Stack Engineer Shakers Bilbao, basque country, Spain Senior Full Stack Software Developer - FinTech PlatformAt Shakers, we’re partnering with a company building a next?generation financial services platform to bring on a Senior Full Stack Software Developer. It’s a hands?on role with real ownership over core systems, working two days a week from a Madrid office in Retiro.The challengeThe team is building out the core of a financial platform from the ground up: customer?facing portals, backend services, and the APIs that tie everything together. There’s real ownership here, working closely with product, data and business stakeholders on architecture, security and performance decisions, while also reviewing code and mentoring less senior developers. Delivery speed matters, and the team leans on AI?assisted tooling (Copilot, Cursor, Claude Code) to move fast without cutting corners on quality.ResponsibilitiesDesign and build core modules of a financial services platformDevelop customer?facing portal experiences on the front endBuild and scale backend services and REST APIsContribute to architecture decisions and technical directionUphold security, performance and reliability standards across the stackPartner with product, data and business teams on deliveryReview code and support the growth of junior developersUse AI?assisted tools to accelerate development without compromising qualityRequirements5+ years of professional software development experienceStrong hands?on experience across front?end (React or Angular) and back?end (Java, Python, Node.Js or Go)Experience with high?volume or transactional systemsStrong problem?solving skillsAvailability for a hybrid model in Madrid (Retiro), 2 days/week onsiteNice to haveExperience in FinTech, financial software or payment systemsExperience mentoring developers or leading technical projectsFamiliarity with Docker, Kubernetes or DevOps practicesWhy this projectLong?term engagement, not a short sprintReal ownership over core platform components, not a peripheral workstreamDirect collaboration with the internal product, data and business teams#FullStackDeveloper #FinTech #SoftwareEngineering #Hybrid #Madrid #Freelance #ShakersFull Stack Engineer Bilbao, basque country, Spain

5+ years of professional software development experience Strong hands?on experience across front?end (React or Angular) and back?end (Java, Python, Node.Js or Go) Experience with high?volume or transactional systems Strong problem?solving skills Availability for a hybrid model in Madrid (Retiro), 2 days/week onsite Nice to have Experience in FinTech, financial software or payment systems Experience mentoring developers or leading technical projects Familiarity with Docker, Kubernetes or DevOps practices