Junior Backend Developer (.NET) - MAD/BCN

About the role

Are you ready to take part in the upcoming AI revolution of the business world? If the answer is a resounding "yes," we have an extraordinary opportunity for you! About Us Aily Labs is a B2B SaaS company building an AI-powered decision intelligence app for enterprises. Our mobile-first platform combines company data with advanced machine learning, large language models, and agentic AI to give business leaders clear, actionable insights in real time. Instead of traditional dashboards and reports, Aily delivers simple, personalized recommendations that help teams decide and act faster across finance, supply chain, R&D, commercial, and more. The app is designed to be intuitive for end users and easy to integrate for IT, so companies can move from analysis and indecision to confident, data-driven decisions every day. Founded in 2020 in Munich, Aily Labs has grown into a global team of 300+ people across Munich, Barcelona, Madrid, Cluj, and New York. Our mission is to democratize AI in business and enable leaders to Lead Boldly, turning complex data into decisions that drive real, measurable impact. If you are passionate about learning how modern backend systems work and want to grow as a software engineer, this is a great opportunity to start your journey. As a Junior .NET Engineer , you will be part of the Domain team, contributing to the development and improvement of our backend systems while learning best practices from experienced engineers. Responsibilities Contribute to the development of backend services using .NET under guidance from senior engineers Write clean, maintainable, and testable code following team standards Support improvements in existing systems (bug fixing, small enhancements, refactoring tasks) Assist in implementing development platform initiatives (tooling, automation, internal improvements) Participate in code reviews and actively learn from feedback Help monitor and troubleshoot issues in lower environments (with support) Collaborate with team members to deliver features and improvements Continuously learn new technologies, tools, and engineering practices Qualifications / Experience 1 or 2 years of experience in software development (or strong academic/project background) Basic knowledge of C# and .NET Understanding of fundamental programming concepts (OOP, clean code basics) Familiarity with REST APIs and basic database concepts (SQL) Exposure to Git and collaborative development workflows Interest in cloud technologies (AWS or similar) is a plus Strong willingness to learn and grow Good communication and teamwork skills Who we're looking for Backend Engineers who excel at building reliable, scalable systems that power high-performance applications at enterprise scale. - Hands-on builders who enjoy developing robust backend services, designing clean architectures, and optimizing systems for performance, scalability, and maintainability. - Strong collaborators who work closely with Frontend Engineers, Product teams, Data teams, and business stakeholders to deliver seamless and impactful user experiences. - Startup mindset: thrives in ambiguity, proactively solves complex technical challenges, and improves systems and processes beyond their immediate scope. - Ready to Lead Boldly - building the backend foundation that enables Aily's platform to deliver millions of real-time interactions daily. - Applicants must already have the legal right to work in Spain. Location & details Locations: Madrid (MAD), Barcelona (BCN). Contract type: Permanent. Work policy: hybrid (2 days per week in the office)