Principal Software Engineer - IBM i (AS/400) Connectivity

OpenKrill; United States; On-site; USD 140,000 - 210,000; Full time

Job summary

Redwood Software seeks a Software Engineer – Principal, IBM i Connectivity, to build a native IBM i integration for Redwood RunMyJobs. You will work on a senior team crafting connectivity, job submission, spool/file handling, and CL/RPG invocation while ensuring secure, scalable integration with the Redwood platform.

You will validate IBM i references, collaborate on architecture decisions, and leverage AI to accelerate development, testing, and documentation in a fast-paced agile environment.

Qualifications

• 10+ years of professional software engineering with Java 8+.
• Hands-on IBM i (AS/400) integration with CL, native APIs, JTOpen/jt400, and DB2 for i.
• Proficiency in C (ILE C) on IBM i.
• Experience with vendor host-server or RPC-style APIs over TCP/IP.
• Strong concurrency and multithreading skills for long-running monitoring components.
• Experience with Git, CI/CD, Docker, and Kubernetes.
• Fluency with AI tools in production engineering.
• Ability to discern plausible AI-generated recommendations for IBM i APIs.
• Architectural focus across shared platform-integration designs.
• Experience with workload automation products (RunMyJobs, CA-7, Control-M, etc.) preferred.

Responsibilities

• Design, develop, test, and maintain native software for IBM i connectivity.
• Build native job submission, spool/file handling, and CL/RPG invocation capabilities.
• Integrate IBM i functionality with Redwood platform via host APIs or JTOpen.
• Extend security using IBM i profiles and authority concepts.
• Troubleshoot complex system-level issues across IBM i, Unix, and Java.
• Improve reliability, performance, security, and scalability of IBM i solutions.
• Collaborate with product managers, architects, and engineers to meet customer requirements.
• Participate in architecture discussions, design reviews, testing and release planning.
• Leverage agentic AI to accelerate implementation and documentation.
• Document connector behavior and prerequisites for field teams.
• Maintain quality through clear communication and ownership in agile environment.

Skills

Java 8+

IBM i integration

CL/RPG

JTOpen/jt400

DB2 for i

ILE C on IBM i

TCP/IP RPC APIs

Concurrency/multithreading

Git/CI/CD/Docker/Kubernetes

AI tooling in prod engineering

Tools

Git

Docker

Kubernetes

JTOpen/jt400

Job description

OUR MISSION

At Redwood, we empower our customers with lights-out automation for their mission-critical business processes.

ABOUT US

Redwood Software is the leading orchestration platform for the autonomous enterprise, driving business transformation at the lowest total cost of ownership. Redwood empowers organizations to intelligently automate and orchestrate mission-critical business and IT processes across complex ERP, hybrid cloud, data and emerging agentic AI systems. Through its SaaS-first automation fabric, with AI embedded across the automation lifecycle, Redwood accelerates the path to autonomous operations. Backed by 30 years of experience and trusted by more than 50% of the Fortune 50, Redwood helps organizations unlock human potential to focus on innovation, growth and what’s next.

CORE VALUES

One Team. One RedwoodMake Your Own WeatherObsess over Customer SuccessWork the ProblemBe CuriousOwn the OutcomeRespect Each Other

YOUR IMPACT

As a Software Engineer – Principal, IBM i (AS/400) Connectivity, you will help build a new connectivity agent that extends Redwood RunMyJobs (RMJ) natively onto IBM i (AS/400), enabling Redwood to support some of the largest enterprise automation environments in the market. You will join a small, senior team building this capability largely from first principles, validating assumptions on live IBM i partitions and making architectural decisions where modern documentation may be limited. This position is open across levels from Software Engineer to Principal as we build out the team.

• Design, develop, test, and maintain native software supporting connectivity and integration with IBM i (AS/400) environments.
• Build native job submission and monitoring, spool file and message/data queue handling, and CL/RPG program invocation capabilities.
• Integrate IBM i functionality with the Redwood platform through clean, versioned extension points using native host server APIs and/or IBM Toolbox for Java (JTOpen/jt400).
• Integrate security and per-user authorization using IBM i user profiles and authority concepts while extending Redwood’s existing identity and credential management capabilities.
• Troubleshoot complex system-level issues across IBM i, Unix, and Java environments.
• Improve the reliability, performance, security, and scalability of Redwood’s IBM i solutions.
• Partner with product managers, architects, and engineers to translate customer requirements into effective technical solutions.
• Participate in architecture discussions, design reviews, code reviews, testing, and release planning.
• Leverage agentic AI to accelerate implementation, testing, and documentation while independently verifying correctness against authoritative IBM i references.
• Document connector behavior and platform prerequisites for field and support teams.
• Contribute to team success through clear communication, shared responsibility for quality, and accountable ownership of goals and delivery commitments in a fast-paced, iterative agile environment.

YOUR EXPERIENCE

If you like growth and working with happy, enthusiastic over-achievers, you'll enjoy your career with us!

• 10+ years of professional software engineering experience with strong Java 8+ skills.
• Hands-on IBM i (AS/400) integration experience, including CL, native job/spool/queue APIs, IBM Toolbox for Java (JTOpen/jt400), and DB2 for i.
• Working proficiency in C, including ILE C on IBM i.
• Experience integrating with vendor host-server or RPC-style APIs over TCP/IP, including connection lifecycle management and error handling.
• Strong concurrency and multithreading skills, with experience building resilient, long-running monitoring components such as job polling and spool/file event detection.
• Ability to work effectively from primary technical sources, including IBM i host-server and API references, rather than relying solely on tutorials or unverified AI-generated output.
• Experience with modern DevOps practices and technologies, including Git, CI/CD, Docker, and Kubernetes.
• Fluency with AI tools in a production engineering environment.
• Strong code judgment, including the ability to identify plausible but incorrect AI-generated recommendations involving specialized IBM i APIs.
• Proficiency in prompting AI tools, combined with the judgment to recognize when a task is too specialized for AI-assisted approaches.
• Ability to maintain an architectural focus, abstracting from individual API and connector details to shared platform-integration designs.
• Experience with workload automation products such as Tidal, CA-7, Control-M, Stonebranch, BMC, or RunMyJobs preferred.
• Experience with IBM i clustering or high-availability configurations preferred.
• Familiarity with advanced IBM i security concepts, including authorization lists and adopted authority, preferred.
• Background working with RPG/COBOL environments or IBM i modernization projects preferred.
• Mainframe or midrange migration project experience preferred.

THE LEGAL BIT

Redwood is an equal opportunity employer. Redwood prohibits unlawful discrimination based on race, colour, religion, sex, gender identity, marital or veteran status, age, national origin, ancestry, citizenship, physical or mental disability, medical condition, genetic information or characteristics (or those of a family member), sexual orientation, pregnancy or any other consideration made unlawful by regional or local laws. We also prohibit discrimination based on a perception that anyone has any of those characteristics or is associated with a person who has or is perceived as having any of those characteristics. All such discrimination is unlawful and will have a zero tolerance policy applied to it.

Redwood will comply with all local data protection laws, including GDPR when it comes to the handling and processing of personal data. Should you wish for us to remove your personal data from our recruitment database, please email us directly at [e-mail]