Senior Software Developer Location: Derby (Hybrid – 1 day in the office per week) Salary: Competitive, dependent on experience Working Hours: 38 hours/week, 8:00am–6:00pm, 4 days per week Our client, a vibrant and growing technology company, is seeking an experienced Senior Software Developer to join their development team. This is an exciting opportunity to work on diverse projects including large-scale data processing systems, enterprise applications, mobile apps and cutting-edge machine learning solutions all within a collaborative and supportive environment. The Role You will be responsible for designing, developing and maintaining complex software systems, working across backend and frontend technologies and supporting web and mobile applications. You will also mentor junior developers, contribute to solution architecture and collaborate with stakeholders to deliver high-quality software. Key Responsibilities Develop and maintain large-scale backend systems using C# .NET / .NET Core Work on requirements analysis, system scoping and solution architecture Build backend solutions to support web and mobile applications Collaborate with team members to solve complex problems and produce high-quality user interfaces Mentor junior developers and share technical knowledge across the team Integrate systems with external platforms such as Salesforce, Xero or Microsoft Dynamics Example Projects Real-time IoT systems communicating via GPRS Enterprise-level native mobile app projects Complex reporting and scheduling systems Rich data analysis, machine learning and AI projects Backend integration with CRM and financial systems Required Skills & Experience C# .NET development (.NET Core) with large-scale system experience LINQ / Entity Framework Experience working with large data sets and complex processing systems Strong experience with GIT source control and JIRA Requirements analysis and system scoping experience 10 years commercial software development experience (senior level) Bachelor’s Degree in Computer Science or related field Desirable Skills Frontend frameworks such as Angular or React Mobile app development (iOS/Android) Cloud hosting experience (AWS or Azure) API / Microservices architecture NoSQL databases (MongoDB, MongoDB Atlas) Kubernetes and Docker containerisation Agile development methodology Personal Attributes Eager to learn and adopt new technologies Strong team player with the ability to work independently Excellent communication skills to explain technical concepts to colleagues and clients Mentoring skills to support junior team members Why Apply This is an excellent opportunity to join a small highly skilled team in a friendly family-run environment working on a range of exciting projects with real-world impact. Our client offers opportunities for professional development, learning new technologies and a flexible hybrid working model. INDEED25