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. Find your next opportunity with us. Take your career to the next level with Experis.
About the Opportunity
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. This is a hands-on role with broad ownership.



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 and initial architecture are in place. Most of what comes next is still open to influence.
How We Build
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.
We use AI across development and inside the product, from document processing and assistants to autonomous agents.
We move fast where we can and carefully where reliability, security, and compliance matter. We avoid unnecessary architecture, excessive meetings, and working from tickets without understanding the problem.
What You’ll Be Doing
Owning features end to end, from problem defi

📌 Fullstack developer (Barcelona)
🏢 Experis
📍 Barcelona