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Intermediate/Senior Informix & Legacy Systems Developer
Intermediate/Senior Informix & Legacy Systems DeveloperRIT Solutions Inc/ Tech Dev IT/ Texperts Inc/ConceptsIT, Inc. • Batavia, IL, United States
Intermediate/Senior Informix & Legacy Systems Developer

Intermediate/Senior Informix & Legacy Systems Developer

RIT Solutions Inc/ Tech Dev IT/ Texperts Inc/ConceptsIT, Inc. • Batavia, IL, United States
10 hours ago
Job type
  • Full-time
Job description
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: Advanced 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.
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Intermediate/Senior Informix & Legacy Systems Developer • Batavia, IL, United States

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