Senior Backend Developer

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 applicationsBuild integrations with APIs and third-party platformsDesign and implement new features and servicesParticipate in architecture and technical design decisionsOptimize and support existing applicationsCollaborate with developers, designers, project managers, and clientsMentor junior developers and contribute to engineering best practices What We Are Looking For Must have 5+ years of backend development experienceStrong knowledge of C# and ASP.NET MVCExperience with .NET 5+ / .NET Core Experience with REST APIs and web servicesExperience with Sitecore, Umbraco or Kentico CMS platformsGit version controlUnderstanding of SOLID principles and secure coding practices (OWASP)Strong analytical and problem-solving skillsComfortable 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 workProfessional proficiency in English What Makes You Successful Collaborative and team-oriented mindsetRespectful and professional communicationOwnership and accountabilityStrong problem-solving skillsCuriosity and continuous learning Nice to have DockerAzure or AWSCI/CD pipelinesMicroservices architectureExperience 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 modelFlexible working hoursCompetitive salary packagePrivate Medical & Life Insurance Your Development Structured onboarding and training programDedicated training budget for personal and professional developmentContinuous development of competencies, including structured exposure to AI tools and practicesExposure to challenging projects across multiple industriesClear career progression opportunities Your Environment Work alongside experienced designers, developers and project managers in a collaborative environmentA modern workspace designed to encourage co-creation, collaboration, and innovationA 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.