Intermediate/Senior Informix & Legacy Systems Developer

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.