Summary
✨ AI‑Generated
Work as a Core Systems Developer maintaining and modernizing business-critical legacy applications across Delphi, C#, and Oracle PL/SQL. You will implement regulatory and business-logic changes, investigate complex defects, manage build and release activities, perform shadow testing, and document technical knowledge to ensure long-term system continuity.
Highlights
Work on a business-critical modernization effort involving complex software, regulatory requirements, release processes, and long-term system continuity. The role provides substantial ownership across development, troubleshooting, testing, and technical knowledge preservation.
Description
Core Systems Developer (Delphi / C# / Oracle PL/SQL)
Location : Bielefeld Area, Germany
Languages Required : German + English
1.
Role Overview
We are looking for two skilled Core Systems Developers to help stabilize, modernize, and de-risk a business-critical legacy core system.
You will focus on maintaining organically grown codebases, implementing regulatory/compliance updates (e.g., German Heating Costs Ordinance / HKVO), managing build/release cycles, executing shadow testing, and driving knowledge documentation for long-term system continuity.
2.
Key Responsibilities
· Core Code Maintenance: Develop, review, and maintain business-critical code across Delphi, C#, and Oracle PL/SQL environments.
· Regulatory & Business Logic: Implement complex mathematical, domain-specific, and regulatory code changes (including HKVO standards).
· L3 Support & Root Cause Analysis: Diagnose complex system defects, perform in-depth code debugging, and deliver permanent technical resolutions.
· System Coverage & Architecture: Cover critical domains across application code, data, and interfaces; document architecture for knowledge transfer.
· Build, Release & Migration: Take ownership of build/release pipelines, execute shadow testing, and support future system modernization/migration initiatives.
3.
Qualifications & Technical Requirements
Must-Have Requirements:
· Core Stack Expertise:
o Several years of development experience with Delphi.
o Very good knowledge of Oracle PL/SQL and relational database concepts.
o Strong hands-on development experience with C#.
· System Experience: Proven track record in maintaining and refactoring large, monolithic, or legacy Windows-based applications.
· Debugging & Analysis: Proficient in deep technical debugging, root cause analysis, and object-oriented software design.
· Analytical Skills: Strong mathematical knowledge and conceptual skills to translate complex domain logic into clean code.
· Languages: Fluent German (written & spoken) and good technical English.
· Location: Willingness to work regularly on-site in the Bielefeld area.
Nice-to-Have Requirements:
· Knowledge of the German Heating Costs Ordinance (HKVO) or experience in the housing/energy sector.
· Experience with print technologies (PCL, PostScript, PDF) or PostgreSQL.
· Familiarity with TFS, Git, automated testing, code reviews, and interface development (REST/SOAP).
· Exposure to database performance tuning or AI-assisted development tools.
