Backend Application Developer (Core Specialist Tier)

Backend Application Developer – Core Specialist Tier Location: Basel, Switzerland Contract Duration: 3 years, with possible extension Experience Required: 3+ years. Industry Experience: Utilities & Energy ( Energie & Wasserversorgung) or Telecommunications or Banking & Financial Services or Information Technology & Services Role Overview We are looking for an experienced Backend Application Developer to support a long-term enterprise project in Basel. This is a 3-year contract role with the possibility of extension. The ideal candidate will have strong hands-on experience in designing, developing, and maintaining secure, scalable, and high-performance backend applications. The role requires solid expertise across Microsoft and open-source technologies, including .NET Framework, .NET Core, Microsoft SQL Server, MySQL, Python, and MVC architecture. Strategic Scope: Responsible for the rigorous structural translation of complex technical business processes and energy-sector transactions into scalable, highly available object-oriented server designs, secure multi-tier logical services, integrated API configurations, and decoupled microservice patterns. Core Responsibilities Requirement Extraction: Systematically analyse, document, and map granular business requirements to engineer structural software components, robust middleware layers, and complete enterprise backend applications. Architectural Design: Define and implement strict functional and non-functional runtime profiles, including high availability, automated horizontal scalability, enterprise-grade security protocols, and minimal processing latency parameters. Data Modeling: Conceptualise, construct, and manage normalized and denormalized relational database schemas, complex entity relationship models, and performance-tuned object-relational mapping configurations. Web Service Implementation: Build, test, document, and support enterprise web service integrations utilizing asynchronous RESTful APIs, high-security SOAP communication paths, and structured microservices architecture layouts. Access & Federation Protocols: Configure and map identity federation integrations across legacy and modernized components by binding application endpoints strictly to modern access frameworks (OAuth2, OpenID Connect, SAML 2.0). Environment Deployment Support: Manage, maintain, and provision isolated localized, staging, and continuous testing application runtime environments, orchestrating automated system packaging and localized deployment workflows. Defect Analysis & Root-Cause Remediation: Provide critical tier-3 engineering diagnostic support, proactively profiling running server systems to detect, reproduce, isolate, and permanently resolve complex technical defects within high-load production software systems. Required Skills & Experience Minimum of 3 to 5+ years of demonstrable enterprise software development tenure in multi-tier server architectures. Strong experience with .NET Framework, including .NET Framework 4.0, .NET Core, MySQL. Good knowledge of MVC architecture. Strong database experience with Microsoft SQL Server Working knowledge of Python. Experience developing APIs, backend services, and enterprise applications. Good understanding of secure coding, performance optimisation, and software development lifecycle practices. Ability to work independently as well as part of a distributed project team. Languages : Flawless bilingual/native-level business German communications proficiency (C1/C2 level written and spoken) is required. The candidate must present seamlessly in German during the technical panel interview (Anbieterfachgespräch). Swiss Compliance : Must hold EU/EFTA nationality or possess an active, valid Swiss permanent residency/work card (C Permit or unrestricted B/G Permit). \*\ What We Offer:\ \ * \* Opportunity to work on challenging projects and contribute to the growth of our company \* Collaborative and dynamic work environment \* Professional development and growth opportunities \* Competitive salary and benefits package Recruitment Process – AI Screening with TARA As part of our recruitment process, candidates may be invited to complete an initial AI-powered screening with TARA, the interview agent. TARA helps us make the hiring process faster, fairer, and more consistent by asking structured, role-relevant questions based on the job requirements. The interview is designed to understand your experience, skills, motivation, and suitability for the role. The AI screening interview may include: Questions about your professional background and relevant experience Role-specific technical or functional questions Questions about your motivation, availability, and communication skills The interview can usually be completed online in 15-20 minutes at a time that is convenient for you. Your responses will be reviewed as part of the overall selection process, together with your CV, application details, and any follow-up interviews with the hiring team. Candidate Experience.: We use AI to support the recruitment process, but final hiring decisions are made by people. Human recruiters and hiring managers remain involved in reviewing candidates and making selection decisions. We are committed to a transparent, respectful, and fair candidate experience. Your data will be handled confidentially and in accordance with applicable data protection requirements.