We are looking for a Senior Backend Developer ready to build in an AI-native environment, where LLMs, automation, and intelligent integrations are part of everyday engineering and not a future roadmap item. You will work alongside developers, designers, project managers, and clients to deliver high-quality platforms that create real business value, using modern technologies and AI-powered tools where they add value. About Significa Significa is a strategic digital agency helping organizations create digital experiences and technology solutions since 2006. Today, we are a team of 80+ professionals across our offices in Athens and Cairo, partnering with leading organizations in Banking, Finance, Insurance, Travel and Tourism to deliver digital experiences and technology solutions that drive growth and innovation. What you will do Develop and maintain backend systems and web applications Build integrations with APIs and third-party platforms Design and implement new features and services Participate in architecture and technical design decisions Optimize and support existing applications Collaborate with developers, designers, project managers, and clients Mentor junior developers and contribute to engineering best practices What we are looking for Must have 5+ years of backend development experience Strong knowledge of C# and ASP.NET MVC Experience with .NET 5+ / .NET Core Experience with REST APIs and web services Experience with Sitecore, Umbraco or Kentico CMS platforms Git version control Understanding of SOLID principles and secure coding practices (OWASP) Strong analytical and problem-solving skills Comfortable using AI tools (e.g. Claude, Claude Code) to improve productivity and accelerate delivery, while maintaining full ownership, critical thinking, and accountability for the quality of your work Professional proficiency in English What Makes you Successful Collaborative and team-oriented mindset Respectful and professional communication Ownership and accountability Strong problem-solving skills Curiosity and continuous learning Nice to have Docker Azure or AWS CI/CD pipelines Microservices architecture Experience integrating LLM APIs (OpenAI, Azure OpenAI, Anthropic) Familiarity with vector databases (e.g. Pinecone, pgvector, Qdrant) Exposure to AI agent frameworks (e.g. Semantic Kernel, LangChain) Tech Stack C# • ASP.NET MVC • .NET Core • REST APIs • Git • Docker • Azure • OpenAI / Azure OpenAI What we offer Your Balance Hybrid working model Flexible working hours Competitive salary package Private Medical & Life Insurance Your Development Structured onboarding and training program Dedicated training budget for personal and professional development Continuous development of competencies, including structured exposure to AI tools and practices Exposure to challenging projects across multiple industries Clear career progression opportunities Your Environment Work alongside experienced designers, developers and project managers in a collaborative environment. A modern workspace designed to encourage co-creation, collaboration, and innovation A culture built on quality, teamwork and continuous improvement Ready to join us ? If you're excited about building high-quality software in a world where AI is reshaping what's possible — and you want to be at the front of that — we would love to hear from you.