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# Principal Software Engineer - IBM i

- **Company:** LIFE CYCLES, L.L.C.
- **Location:** United States (Remote available)
- **Experience:** Expert
- **Salary:** $91,000.0 - $203,000.0
- **Contract:** Permanent contract
- **Skills:** Db2400, Java (Programming Language), Application Programming Interfaces (APIs), Artificial Intelligence, IBM System I, Bioinformatics, Unix, Software as a Service, Cluster Analysis, COBOL (Programming Language), Code Review, Continuous Integration, DevOps, Mainframes, Release Management, Software Engineering, Systems Integration, TCP/IP, Multithreading, Concurrency, Git, Kubernetes, Docker, Control M
- **Published:** September 26, 2026
- **Apply:** https://www.builtincolorado.com/job/principal-software-engineer-ibm-i-400-connectivity/11381711?handler=ApplyRedirect

## About the Role

* 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.

If you like growth and working with happy, enthusiastic over-achievers, you'll enjoy your career with us!, Leads revenue recognition, billing, accounts receivable, collections, audit readiness, and financial control operations. Ensures ASC 606 and GAAP compliance, manages billing platforms and ERP integrations, drives automation and AI adoption, develops scalable processes, partners cross-functionally, reports financial metrics, and supervises accounting staff. Requires extensive revenue accounting and billing experience in SaaS or software, management expertise, and strong technical accounting knowledge.
Top Skills: Ai-Enabled Accounting Automation ToolsBilling PlatformsErp SystemsExcelMicrosoft OutlookMicrosoft WordNetSuiteOracleSAP

## Description

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., Leads complex, multi-workstream product initiatives as a principal Product Owner. Owns product vision, strategy, backlog integrity, prioritization, and Scrum team alignment. Coordinates Product, Engineering, Design, Delivery, and other stakeholders; improves execution discipline, transparency, and outcome tracking. Stabilizes programs with fragmented ownership or elevated delivery risk while ensuring customer and business requirements are addressed. Requires substantial Product Owner or Senior Product Manager experience, preferably in payments or financial services., Leads revenue recognition, billing, accounts receivable, collections, audit readiness, and financial controls. Owns ASC 606 compliance, billing systems, process automation, AI-enabled accounting improvements, reporting, and cross-functional alignment. Manages and mentors the accounting team while supporting scalable revenue operations and public-company readiness.
Top Skills: Ai-Enabled Automation ToolsAsc 606GaapExcelMicrosoft OutlookMicrosoft WordNetSuiteOracleSAP

What you need to know about the Colorado Tech Scene

With a business-friendly climate and research universities like CU Boulder and Colorado State, Colorado has made a name for itself as a startup ecosystem. The state boasts a skilled workforce and high quality of life thanks to its affordable housing, vibrant cultural scene and unparalleled opportunities for outdoor recreation. Colorado is also home to the National Renewable Energy Laboratory, helping cement its status as a hub for renewable energy innovation.

Key Facts About Colorado Tech

 * Number of Tech Workers: 260,000; 8.5% of overall workforce (2024 CompTIA survey)
 * Major Tech Employers: Lockheed Martin, Century Link, Comcast, BAE Systems, Level 3
 * Key Industries: Software, artificial intelligence, aerospace, e-commerce, fintech, healthtech
 * Funding Landscape: $4.9 billion in VC funding in 2024 (Pitchbook)
 * Notable Investors: Access Venture Partners, Ridgeline Ventures, Techstars, Blackhorn Ventures
 * Research Centers and Universities: Colorado School of Mines, University of Colorado Boulder, University of Denver, Colorado State University, Mesa Laboratory, Space Science Institute, National Center for Atmospheric Research, National Renewable Energy Laboratory, Gottlieb Institute


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