Backend Application Developer (Core Specialist Tier)

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.

Tasks

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., 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., * 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.

Industry Experience: Utilities & Energy (****Energie & Wasserversorgung) or Telecommunications or Banking & Financial Services or Information Technology & Services, * 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).

• 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.