Job Summary: We are seeking a backend development professional to build mobile APIs, microservices, and enhance the business’s core systems, participating in new developments and optimization. Key Responsibilities: 1. Mobile API and microservice development 2. Enhancement of core systems (risk, fraud, payments) 3. Participation in greenfield development and optimization A university degree or higher in a technological field is required for this backend development position. Candidates must have over 6 years of experience and a very high level of English (C1+). Responsibilities include developing mobile APIs and building microservices to evolve the architecture. Additionally, candidates will enhance core business systems such as risk management, fraud detection, and payment processing, participating both in greenfield development and in optimizing existing systems. A disability certificate with a degree of disability equal to or greater than 33%, or officially recognized permanent disability, is mandatory. Experience in the financial sector and in startup or scale-up environments will be valued. This position offers an indefinite full-time contract, with morning and afternoon working hours, and a gross monthly salary of €3,000. The position is based in Madrid and will be performed remotely.