Intermediate/Senior Informix -  HP-UX -4GL

📍 Job Overview

Job Title: Intermediate/Senior Informix - HP-UX - 4GL Developer

Company: VTekis Consulting LLP

Location: Chicago, Illinois, United States

Job Type: Contract

Category: Software Development / Legacy Systems Modernization

Date Posted: April 07, 2026

Experience Level: Intermediate/Senior (5+ years)

Remote Status: On-site

🚀 Role Summary

• This contract role focuses on the modernization and maintenance of a critical legacy ERP platform, requiring expertise in Informix 4GL and HP-UX.

• The position involves bridging legacy system logic with modern requirements, including migrating Informix 4GL to Genero BDL and leading API integration projects.

• Candidates will be responsible for technical troubleshooting, performance optimization of Informix databases, and ensuring high-quality deployments.

• This role demands strong collaboration with cross-functional teams and effective daily coordination with an offshore development team.

• The primary objective is to support and modernize a legacy ERP platform while accelerating its integration with Salesforce and e-commerce solutions.

📝 Enhancement Note: While the job title specifies "Informix - HP-UX - 4GL," the description indicates a shift towards Genero BDL and modern integration technologies. This suggests the role is not just about maintaining legacy systems but actively involved in their transformation and modernization. The "Contract" employment type implies a project-based engagement, likely with a defined scope and duration, focusing on specific modernization deliverables.

📈 Primary Responsibilities

• System Modernization & Design: Collaborate with cross-functional teams and stakeholders to design and implement robust solutions that effectively bridge legacy logic with modern requirements, specifically focusing on migrating Informix 4GL components to Genero BDL.

• Legacy Code Development & Optimization: Write, test, and optimize clean, maintainable, and efficient code in Informix 4GL, Genero BDL, and Unix Shell Scripting (Korn, Awk) for existing and modernized functionalities.

• Technical Troubleshooting & Performance Tuning: Diagnose and resolve complex application issues and database performance bottlenecks within the Informix Dynamic Server environment, utilizing diagnostic utilities like oncheck and set explain.

• Deployment, Integration & Testing: Lead and execute integration, User Acceptance Testing (UAT), and performance testing activities to ensure high-quality, reliable deployments with minimal business disruption.

• Support & Documentation Management: Manage and resolve incidents and work orders escalated from the Service Desk, strictly adhering to established Service Level Agreements (SLAs), and maintain comprehensive, up-to-date technical documentation for all system components and processes.

• API Development & Integration: Lead the build-out and integration of APIs, working closely with key technical stakeholders to ensure seamless connectivity between the legacy ERP and modern platforms like Salesforce and e-commerce solutions.

• Team Coordination & Management: Provide daily coordination and technical guidance to a small, lean offshore development team, ensuring alignment with project goals and quality standards.

📝 Enhancement Note: The responsibilities highlight a dual focus: deep expertise in legacy Informix 4GL and HP-UX, alongside active involvement in modernizing these systems through Genero BDL and API integrations. The mention of "bridging legacy logic with modern requirements" and "migrating Informix 4GL to Genero BDL" indicates a strategic modernization effort, not just maintenance.

🎓 Skills & Qualifications

Education: While formal education requirements are not explicitly stated, a Bachelor's degree in Computer Science, Information Technology, or a related field is typically expected for roles involving this level of technical complexity and experience. Equivalent practical experience will also be considered.

Experience: Minimum of 5 years of direct experience working with the Informix legacy platform, specifically with Informix 4GL.

Required Technical Skills:

• Primary Languages: Expert-level proficiency in Informix 4GL, Genero BDL, and SQL.

• Operating Systems: Mastery of Unix-based systems, with a strong emphasis on HP-UX. Proficiency in other Unix variants (IBM AIX, Linux) and Windows environments is also required.

• Shell Scripting: Advanced skills in Unix Shell Scripting, including Korn shell and Awk.

• Database Management: Deep understanding and hands-on experience with IBM Informix Dynamic Server (IDS), including performance tuning and diagnostics.

• Version Control: Proven experience with version control systems such as Git, GitHub, or GitLab.

• API Integration: Understanding and practical experience with API integration concepts, including RESTful and SOAP services.

Secondary Languages (for integration and modern application support):

Preferred Technical Skills:

• Database Management: Familiarity with other relational databases like SQL Server, Oracle, or Snowflake.

• Integration Technologies: Understanding of Electronic Data Interchange (EDI) standards (e.g., 810, 820), XML.

Preferred Domain Knowledge:

• Experience with Enterprise Resource Planning (ERP) Supply Chain concepts, including Order Creation, Pick-Pack-Ship processes, Invoicing, and Bill of Materials (BOM).

• Familiarity with Warehouse Management Systems (WMS) and manufacturing workflows.

📝 Enhancement Note: The requirement for "5 years of experience on the Informix legacy platform (specifically 4GL)" sets a clear minimum. The inclusion of Genero BDL, Java/Python/Perl, and API integration points to a modernization project where legacy skills are foundational, but adaptability to newer technologies is crucial for success.

📊 Process & Systems Portfolio Requirements

Portfolio Essentials:

• Legacy System Case Studies: Demonstrate successful development, maintenance, or optimization projects involving Informix 4GL and HP-UX environments. Highlight specific contributions to system stability, performance, or feature enhancements.

• Modernization Projects: Showcase examples of migrating or integrating legacy logic with modern platforms. This could include projects involving Genero BDL, API development (REST/SOAP), or data migration strategies.

• Performance Tuning Examples: Provide documented instances where you identified and resolved performance bottlenecks in Informix databases or applications, detailing the methodology used (e.g., oncheck diagnostics, set explain) and the resulting improvements (e.g., reduced query times, increased throughput).

• Integration Workflows: Illustrate your understanding of system integrations, particularly how you've connected disparate systems, managed data flow (e.g., EDI, XML), or built/consumed APIs.

• Shell Scripting Examples: Include examples of complex Korn or Awk scripts used for automation, data manipulation, or system administration tasks within a Unix environment.

Process Documentation:

• Workflow Design & Optimization: Be prepared to discuss how you approach designing new workflows or optimizing existing ones within legacy and hybrid environments, focusing on efficiency and data integrity.

• Implementation & Automation: Detail your experience with deploying code changes, managing UAT, and implementing automation for testing or operational tasks within Unix/Informix systems.

• Measurement & Analysis: Demonstrate how you measure the impact of your work, including tracking system performance metrics, resolution times for incidents, and the business value of modernized features or integrations.

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