At Experis, a ManpowerGroup company, we specialise in recruiting the best tech talent and matching them with all kinds of organisations, from large corporations to start-ups. We are a company specialising in IT consultancy and the recruitment of professionals in the technology sector across our three practice areas: Business Transformation, Cloud & Infrastructure, and Enterprise Applications. We have a workforce of over 1,800 IT specialists in Spain and an international presence in 54 countries. If you’re a technology professional, we’d love to help you find that new opportunity you’re looking for – the one that will propel you to the next level in your career. We’re looking for a Senior Software Engineer to join Kompanion as the third person in Engineering and one of the first eight employees in the company. You’ll help build the foundations of a robust, AI-native platform for critical tax, accounting, and financial workflows. You’ll lead features end to end, work closely with Tax, Accounting, Growth, and Operations, and help shape our product, engineering standards, hiring, and technical culture. Our stack includes Java, Spring Boot, Next.js, and PostgreSQL. Engineering owns almost the full product loop: refining problems, researching the domain,



writing PRDs, designing solutions, building, shipping, and validating them. Building across the stack, with a stronger focus on backend systems and business logic Operating the platform in production and improving its reliability, performance, observability, and security Working closely with Tax, Accounting, Growth, and Operations Improving our architecture, developer experience, testing, and engineering standards 5+ years of experience building and operating production software ~ Strong backend engineering experience ~ Experience with Java and Spring Boot, or the ability to become productive with them quickly ~ Solid PostgreSQL knowledge, including data modelling and query performance ~ The ability to work with React or Next.js when needed ~ Strong fundamentals in clean code, testing, security, and system design ~ A degree in Computer Science, Software Engineering, or a related field is welcome, but not required. Experience building regulated, auditable, or high-stakes software Experience designing a platform from its early stages Experience with security, privacy, or sensitive financial data Previous early-stage startup experience

📌 Full Stack Ontwikkelaar (España)
🏢 Experis España
📍 España