Intermediate/Senior Informix & Legacy Systems Developer

Intermediate/Senior Informix & Legacy Systems Developer Batavia, IL - Hybrid Must be a local. Job Description Role: Intermediate/Senior Informix & Legacy Systems Developer Position Overview We are seeking a technical specialist with deep expertise in legacy IBM/Informix platforms. This role is critical to supporting and modernizing our legacy infrastructure, specifically focusing on Client-UX and IBM AIX environments. You will be responsible for maintaining mission-critical ERP, supply chain, and warehouse management systems while driving technical performance optimizations. Key Responsibilities System Modernization & Design: Collaborate with cross-functional teams to design and implement robust solutions that bridge legacy logic with modern requirements (e.g., migrating Informix 4GL to Genero BDL). Legacy Maintenance: Write and optimize clean, maintainable code in Informix 4GL, Genero BDL, and Unix Shell Scripting (Korn, Awk). Technical Troubleshooting: Resolve complex application issues and database performance bottlenecks using utilities like oncheck and set explain. Deployment & Testing: Lead integration, UAT, and performance testing activities to ensure high-quality deployments with minimal business disruption. Support & Documentation: Manage incidents and work orders escalated from the Service Desk, adhering to established SLAs, and maintain comprehensive technical documentation. Required Technical Skills Primary Languages: Expert-level Informix 4GL, Genero BDL, and SQL. Secondary Languages: Proficiency in Java, Python, or Perl for integration and modern application support. Database Management: dvanced knowledge of IBM Informix Dynamic Server (IDS); familiarity with SQL Server, Oracle, or Snowflake is a plus. Operating Systems: Mastery of Unix-based systems (Client-UX, IBM AIX, Linux) and Windows environments. Integrations: Understanding of EDI (810, 820), XML, and API integration (RESTful/SOAP). Version Control: Hands-on experience with Git, GitHub, or GitLab. Preferred Domain Knowledge Experience with ERP Supply Chain concepts: Order creation, Pick-Pack-Ship, Invoicing, and Bill of Materials (BOM). Familiarity with Warehouse Management Systems (WMS) and manufacturing workflows. Role & Project Scope Core Objective: Support and modernize a mission-critical Legacy ERP platform while expediting its integration with Salesforce and e-commerce platforms. Key Responsibilities: Directly manage Informix 4GL development and maintenance. Lead API build-out and integration projects alongside key technical stakeholders. Operate within a Unix/Linux environment. Team Dynamics: Small, lean team consisting of one onsite resource and three offshore members; requires daily coordination with the offshore team. Candidate Requirements Technical Expertise: Minimum 5 years of experience on the Informix legacy platform (specifically 4GL). Domain Knowledge: Strong business understanding of Supply Chain workflows and operations. Technical Environment: Proficiency in Unix/Linux and API development. Soft Skills: Exceptional communication skills to effectively collaborate with and guide offshore team members.

Created: 2026-03-04