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Intermediate/Senior Informix & Legacy Systems Developer
Intermediate/Senior Informix & Legacy Systems DeveloperArgyllinfotech • Batavia, IL, United States
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Intermediate / Senior Informix & Legacy Systems Developer

Intermediate / Senior Informix & Legacy Systems Developer

Argyllinfotech • Batavia, IL, United States
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Role : Intermediate / Senior Informix & Legacy Systems Developer

Location : Batavia, IL

Visa Status : No OPT,CPT,H1B

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 HP-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 (HP-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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    IntermediateSenior Informix Legacy Systems Developer • Batavia, IL, United States

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