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