Senior Developer (iSeries + API) in Northbrook, Illinois - #72597 | VanderHouwen

Description

Job Id: 72597

Senior Developer (iSeries + API)
Our client is seeking a Senior Developer (I-Series + API) to help bridge the gap between established enterprise platforms and modern application ecosystems. This individual will thrive in environments that require both technical depth and strategic thinking, bringing expertise in legacy system analysis, backend development, and enterprise integrations to support critical business operations while advancing modernization initiatives. The ideal candidate is a collaborative problem-solver who enjoys untangling complex systems, translating technical concepts into practical solutions, and driving high-quality outcomes across cross-functional teams.

This role is fully remote.

Senior Developer (iSeries + API) Responsibilities

• Design, develop, enhance, and support applications across both I-Series environments and modern technology platforms.
• Analyze existing applications, source code, databases, interfaces, and data flows to uncover business logic, identify root causes, and recommend improvements.
• Lead the development and maintenance of enterprise integrations, including backend services, APIs, and system interfaces that enable seamless data exchange.
• Reverse-engineer legacy functionality and translate technical implementations into clear business and functional requirements.
• Build and support RESTful and SOAP-based services while adhering to established integration standards and API governance practices.
• Develop modern applications and integrations using C# and .NET technologies to extend and enhance enterprise capabilities.
• Produce technical documentation, development estimates, and implementation plans aligned with both immediate business needs and long-term sustainability.
• Partner closely with business stakeholders and technology teams to communicate complex concepts, prioritize initiatives, and deliver effective solutions.
• Promote software engineering best practices, including coding standards, security considerations, automated testing, and continuous improvement initiatives.
• Contribute to Agile delivery processes and support the adoption of modern software development methodologies and tools.

Senior Developer (iSeries + API) Qualifications

• Bachelor’s degree in Computer Science, Information Systems, or a related field preferred. Equivalent professional experience will also be considered.
• Eight or more years of hands-on development experience within I-Series (AS/400) environments utilizing RPGLE and CLP.
• Proven experience evaluating legacy applications and deriving functional requirements through analysis of code, databases, and business processes.
• Five or more years of experience developing and supporting backend services, enterprise integrations, and APIs utilizing REST, SOAP, JSON, and XML technologies.
• Five or more years of experience developing applications and integrations using C# and .NET technologies.
• Strong understanding of microservices concepts, API lifecycle management, and integration best practices.
• Experience working within Agile environments and familiarity with CI/CD pipelines, automated testing practices, and contemporary software delivery approaches.
• Demonstrated ability to balance support for existing systems while contributing to modernization and transformation initiatives.
• Exceptional analytical, troubleshooting, and problem-solving skills with a passion for understanding how technology enables business operations.
• Strong communication and relationship-building skills with the ability to translate technical information for non-technical audiences.
• Experience within retail merchandising, product data, item management, product lifecycle processes, or related business domains is preferred.
• Exposure to Product Information Management (PIM), supplier-facing platforms, or enterprise item management solutions is a plus.
• Proven ability to manage multiple priorities, demonstrate ownership, and drive initiatives through completion with a customer-focused mindset.

Compensation: (DOE)

VanderHouwen Contractors Enjoy Exceptional Benefit Perks!
As an eligible contract employee with VanderHouwen, you’ll have access to a full suite of benefits designed with your well-being in mind. Our comprehensive package includes medical, dental, vision, life insurance, short- and long-term disability, and a matching 401(k) to help secure your future.

Meet VanderHouwen
What kind of recruiter do you see yourself working with? One who prioritizes your best interest, no matter what? VanderHouwen does, and we’re in it for the long game! Our recruiters focus on YOU, building meaningful, long-term relationships while developing a deep understanding of companies’ staffing needs and workplace cultures. This approach helps us find an ideal job match that aligns with your unique career aspirations and goals.

VanderHouwen is an award-winning, Women & Diversity-Owned, WBENC certified professional staffing firm. Founded in 1987, VanderHouwen places experienced professionals across the nation! Our recruitment teams specialize in either Technology and IT, Engineering, Human Resources, or Accounting and Finance career markets. Partner with us to land your next exciting career!

VanderHouwen is an Equal Opportunity Employer and participates in E-Verify. VanderHouwen does not discriminate based on race, color, religion, sex, national origin, age, disability, or any other characteristic protected by applicable local, state, or federal civil rights laws.

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