Intro: LetsReg by Deltager AS has been a market leader in registration and payment solutions in Norway since 2000. Licensed as a payment institution, we securely process over NOK 1 billion annually through our client account system, used by both small and large businesses. In recent years, we have accelerated and made significant investments to reach new heights through a newly launched booking solution and a 360-degree rebranding to LetsReg. In addition, we have subsidiaries in Sandefjord (Pindena AS) and England (Participant UK), as well as tech teams in India and Ukraine. We are a small but international company with high growth ambitions, to be realized through stable and scalable solutions. Our next goals include putting a strong focus on User Experience with our new React frontend, and a global expansion starting with European markets first. What you'll do: Build and improve our core platform using the latest .NET ecosystem Work closely with product and designers, decisions are fast and data-driven Own your designs and solutions end-to-end ( API, architecture, integrations, performance, testing ) Help shape our culture, processes, and product direction What we are looking for: 3-5 years of experience with ASP.NET Core (C#) Comfortable using AI tools (Copilot, ChatGPT, Builder.io, Claude) in daily work Bonus: worked with React, Azure, GitHub Actions, SQL Server , Cloudflare , Service Bus Bonus: experience with event organization and mobile app development Drive and ambition, someone who wants to grow and have fun with us A T-shaped mindset expert in one area, curious about others Why join us: Competitive salary and total package, including the possibility for equity Small, ambitious team -> no bureaucracy, direct influence Flexible work setup at the newly opened Rebel in central Oslo Scale up with strong owners, solid customers and 25 years on the market Relocation package available for the right candidate relocating within the EU/EEA to Oslo region Location: Oslo, Norway (we support relocation from within EU/EEA).