Hackajob is collaborating with ONYX Insight to connect them with exceptional tech professionals for this role. Are you a seasoned developer with a passion for building scalable, high-impact software solutions? Do you enjoy making hands-on contributions to cutting-edge technology? At ONYX Insight, they're looking for a Senior Software Developer to join their growing team and help build the future of their tech stack. This is an opportunity to support architecture, develop, and refine the technology that powers the future of renewable energy. With your expertise in modern C# .NET and React, you’ll play a key role in delivering robust solutions that support their core platforms and products. At ONYX Insight, they empower their teams to innovate, solve complex problems, and have a real-world impact. What you'll do: Build and Deliver: Design, develop, and deploy new features across both backend and frontend systems. Collaborate: Work closely with cross-functional teams to create intuitive, high-performance solutions that deliver value to their users. Develop Scalable Solutions: Write clean, maintainable, and scalable code using modern C# .NET (6-9) and React. Support DevOps Practices: Collaborate with platform engineers to support CI/CD pipelines and infrastructure automation, ensuring efficiency and reliability. What you'll have/be: 5 years of experience in commercial software development with a focus on modern C# .NET. Strong hands-on background in React and frontend development (2 years). Experience in application design and microservices architecture. Familiarity with cloud platforms, preferably AWS. Proficiency with relational databases, ideally PostgreSQL. Knowledge of Agile methodologies and modern software delivery practices. Strong communication and collaboration skills, with a proactive mindset focused on delivering tangible results. A passion for solving real-world problems with technology.