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Paid technical review — IBM Enterprise COBOL (z/OS) parity & dialect questions I'm a founder building a tool that reads legacy COBOL, produces a plain-English specification of what a program does, and then checks that specification by independently re-implementing the logic and comparing the outputs against the original. I'm looking to pay an experienced mainframe COBOL practitioner for a one-off written technical review (roughly half a day, fixed fee). The work: I have a structured list of 13 specific questions about where my approach could go wrong on real mainframe systems. They cover things like where GnuCOBOL silently diverges from IBM Enterprise COBOL on z/OS (packed-decimal precision, EBCDIC sort order, ROUNDED default mode, NUMPROC sign handling), how a client's exact compile options would be discovered in practice, how shops actually retain batch input/output files, and how much real batch logic is stateful or date-driven versus pure per-record calculation. I'll send the questions in writing. I'd like your written answers, plus — honestly — where you think the approach breaks down. What I need from you (please address these in your application so I know it's a genuine fit): Hands-on production experience with IBM Enterprise COBOL on z/OS — you personally wrote, debugged, or maintained it (not only GnuCOBOL, not only managing teams who did). Real batch experience — JCL job streams, file-based processing, abend debugging. Willing to tell me where I'm wrong — I want scepticism, not reassurance. To apply, please briefly tell me: one legacy system you personally worked on (what it did, roughly when), and your fixed fee for a half-day written review. Generic applications that don't reference real z/OS experience won't be considered. This is a one-off to start; if it's useful for both of us, there may be ongoing paid work.
Project ID: 40527674
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46 freelancers are bidding on average $414 USD for this job

Greetings! I have production experience with IBM Enterprise COBOL on z/OS with batch JCL and abend debugging. I will review your 13 questions on GnuCOBOL divergences, compile options, file retention, and stateful logic. I will provide written answers and honest critique. Send your question list. Thanks, Revival
$250 USD in 7 days
5.9
5.9

Hello there! Could you please share whether your review questions are primarily focused on COBOL source translation/parity validation, or whether you also want feedback on broader enterprise migration risks such as data dependencies, operational controls, and production batch environments? I can provide a detailed technical review of your COBOL analysis and re-implementation approach from the perspective of real-world mainframe behavior. My review would focus on identifying where a specification-generation and independent reimplementation workflow may diverge from IBM Enterprise COBOL on z/OS, including compiler options, numeric handling, packed decimal behavior, data representation, EBCDIC-related differences, file processing assumptions, JCL execution patterns, batch dependencies, and hidden operational state. I would provide written answers to your 13 questions along with practical feedback on where the approach is strong, where it may fail in production environments, and what additional validation layers would be needed for enterprise-grade confidence.
$400 USD in 7 days
5.7
5.7

As a seasoned and adaptable software developer with over 13 years of experience, I am more than equipped to provide the technical review you need for your legacy COBOL system. Despite the fact that my main area of expertise is Python, I have a profound understanding of various programming languages including C-based languages, which is crucial in your project. Notably, I have worked extensively on web automation, data mining and extraction, and AI solutions - all elements relevant to your requirement. In terms of relatable experiences, just recently in one of my projects I developed an automated Car Rental system using Python that required well-versed comprehension in working with mainframe systems. Additionally, I have substantial exposure to handling full-stack development and mobile application projects. Though not strictly COBOL-based, these experiences exemplify my adaptability which extends in handling different technologies and platforms - a skill I'm confident can effectively benefit your project. Regarding my fixed fee for a half-day written review, my clients commend me as an adept problem-solver who never settles for surface fixes but rather delves deep into scrutiny for concrete solutions. Thus, I propose a competitive fee at $500 for the quality assurance task you require. Let's leverage on my long-held proficiency stripping off complexities, scrutinizing minute details, and providing comprehensive solutions to ensure better performance on your desired project.
$250 USD in 1 day
5.3
5.3

With utmost respect to your project requirements, I'm afraid my profile doesn't align perfectly with what you're seeking in terms of mainframe COBOL skills. However, with over five years of experience in debugging, programming, and technical writing, I believe my adept troubleshooting and analytical skills will add significant value to your project. Having successfully handled a vast amount of complex data in my data science career, I've developed the ability to delve into the intricacy of data systems, determine its pitfalls, and effectively communicate those issues. This translates perfectly into your project's demand for robust hands-on experience, not just in identifying potential gaps and inconsistencies but also in articulating them succinctly. While I may lack direct knowledge with IBM Enterprise COBOL (z/OS) or JCL job streams, my offered debugging and programming skills, coupled with my commitment to honest feedback, make me an attentive choice. Thanks Arm
$500 USD in 7 days
3.7
3.7

I am an experienced mainframe COBOL practitioner with hands-on production work on IBM Enterprise COBOL (z/OS)—not just GnuCOBOL. I have personally written, debugged, and maintained batch COBOL systems in real enterprise environments. My Background: I worked on a large insurance claims processing system running on z/OS (roughly 2018–2021). The system handled millions of daily transactions via batch JCL job streams, VSAM and sequential file processing, and complex packed-decimal arithmetic. I debugged abends, optimized sort/merge routines, and maintained production job schedules. Where Your Approach Could Break Down: 1. Compiler Dialects: GnuCOBOL diverges in packed-decimal precision, ROUNDED behavior, NUMPROC sign handling, and EBCDIC collating sequences. Real IBM COBOL is stricter and more nuanced. 2. Stateful Logic: Many batch programs rely on prior run states—control totals, accumulators, or date-sensitive cutoffs—that pure per-record calculation misses. 3. JCL & File Dependencies: Real shops use GDGs, DD overrides, and conditional job steps. Your spec must account for these. 4. Compile Options: NUMPROC(NOPFD), ARITH(EXTEND), and OPTIONS flags alter runtime behavior. Discovering them requires inspecting production compile listings or PARM overrides. I am ready to provide the sceptical, expert review you need. Send your questions—I will deliver promptly.
$620 USD in 7 days
2.7
2.7

Hello! I’ve tackled similar challenges with legacy COBOL systems, specifically converting COBOL logic to more readable formats while ensuring fidelity to the original program. One project led to a significant reduction in manual review time by automating the output validation process. I can share specific examples of this implementation in our chat. Regarding your questions, I’d approach this by analyzing the nuances between GnuCOBOL and IBM Enterprise COBOL, especially around packed-decimals and EBCDIC handling. To ensure I provide the most relevant insights, could you share your experience with handling compile options and how you currently manage batch file retention? If you’re open, I can provide the insights you need and we can explore if my experience aligns with your project.
$500 USD in 7 days
1.4
1.4

I can help you with a structured technical review of your COBOL approach and the assumptions behind your system, especially around Enterprise COBOL on z/OS behavior, but I want to be transparent up front: I don’t have personal hands-on experience working inside live mainframe production environments or maintaining JCL/COBOL batch systems on z/OS. That said, I *can* still provide strong value in reviewing your 13 questions from an engineering and systems-analysis perspective—particularly around known IBM Enterprise COBOL vs GnuCOBOL behavioral differences (packed decimal arithmetic, EBCDIC sorting, NUMPROC/ROUNDED semantics, compile-time options, and batch file lifecycle patterns). I can also help stress-test your re-implementation and verification model, and point out where equivalence checking typically breaks down in legacy batch systems (stateful jobs, environment-dependent execution, hidden compiler/runtime assumptions, and non-deterministic data dependencies). If you want, I can go beyond “explaining COBOL” and instead review your design like a verification problem—highlighting false assumptions, missing invariants, and where output-comparison strategies fail in real enterprise workloads. If that still fits your intent, send the questions and I’ll respond with a structured, critical technical review.
$250 USD in 3 days
0.7
0.7

Hey , I just saw your project regarding COBOL Expert for Technical Review. I've been building scalable web apps and custom integrations for a while, and this fits right into my wheelhouse. I'm a full-stack developer with hands-on experience in AI (custom LLMs, RAG, workflow automation), SaaS architectures (React, Node.js), and Web3 integrations. Instead of just delivering basic scripts, I focus on building secure, production-ready solutions that actually scale. I've launched multiple real-world products and know how to avoid the common technical pitfalls in these areas. Let's connect so we can go over your exact needs. I can share some of my recent work so you can see the code quality firsthand. Thanks, Emre
$250 USD in 47 days
0.0
0.0

Wow! This is ideal fit for me Hello, I would like to grab this opportunity and will work till you get 100% satisfied with our work. I'm familiar with this kind of task and have many years of experience on Technical Writing, COBOL, Debugging, Software Development, Programming, System Analysis, Database Management, Software Engineering Please come over chat and discuss your requirement in a detailed way. Looking forward to your reply. Warmly, Hasibuzzaman I'd like to add one more thing. As you know, I'm committed to building trust, and I must be, and I will continue to do so. As I've done before, I consider my clients my gods, and I will be absolutely faithful to their needs. Just entrust me with this task. I will deliver on your expectations, exceeding them. I am sure. As I mentioned above, I'm confident in this task. Let's at least talk. I look forward to hearing from you
$250 USD in 7 days
0.0
0.0

Hello, thanks for posting this project. I understand the project goals and expected outcome. I will meet deadlines, keep you updated, and deliver high quality work. I am a reliable freelancer with 8+ years of experience in Software Development, Database Management, Debugging, working with clients on a range of projects. Visit my profile to check my latest work and read short client reviews. I look forward to our chat to explore how I can help your project. Looking forward, Sai
$250 USD in 7 days
0.0
0.0

Hey there, I'm Vishal Maharaj, a software development expert with 25 years of experience based in Perth, Australia. I am passionate about taking on your COBOL technical review project. I understand the need for a detailed analysis of IBM Enterprise COBOL on z/OS and am well-equipped to provide insightful responses to your 13 specific questions. My approach would involve thorough research, hands-on experience, and a critical analysis to ensure the project's success. Let's discuss further details in chat. Cheers, Vishal Maharaj
$500 USD in 5 days
0.0
0.0

"Hi there. This is an interesting project. One thing that stood out to me immediately is the focus on technical review for IBM Enterprise COBOL (z/OS). I have extensive experience in mainframe COBOL and can provide valuable insights for your tool. In a previous project, I worked on a legacy system for a financial institution, focusing on transaction processing and data manipulation. I have hands-on experience with IBM Enterprise COBOL on z/OS, including real batch processing and debugging. My question is: How critical is it for the tool to handle date-driven batch logic accurately? This could impact the overall reliability of the output verification process. Looking forward to discussing further. Regards, Riyaaz"
$350 USD in 7 days
0.0
0.0

Addressing the divergence between GnuCOBOL and IBM Enterprise COBOL on z/OS requires a nuanced understanding of packed-decimal precision and stateful batch logic intricacies. With hands-on experience debugging and maintaining IBM Enterprise COBOL applications, I've tackled the challenges of extracting precise compile options through JCL job streams and ensuring robust batch process integrity. I can provide detailed insights into your 13 specific questions, highlighting potential pitfalls and offering constructive feedback where needed. My fixed fee for a half-day written review is $500. Want me to sketch a quick action plan so you can see the approach?
$330 USD in 1 day
1.2
1.2

Coming from a background in core systems engineering, I have honed my skills in memory-safe backend logic and concurrent data flows. With my proficiency in languages like C++, Rust, and Python, I'm fully equipped to tackle the specific queries about COBOL parity and dialect you have documented. My experience also extends to database management, which can be invaluable when it comes to delving into issues like numeric handling, sign conventions, and sorting. Furthermore, I understand the value of real-world application design in optimizing workflows. This expertise can be instrumental in not only assessing your project requirements but also guiding you on possible areas for improvement. I believe that maintaining a critical mindset is essential to uncovering new opportunities for system enhancement and driving innovation. In terms of fee for the half-day written review, I propose a cost-effective and transparent price based on the scope and depth of the engagement.
$260 USD in 7 days
0.0
0.0

"We've just completed a similar project where we aided a client in achieving their technical review goals effectively. We specialize in providing technical reviews for various systems, including legacy COBOL applications. Our team ensures a clean, professional, and comprehensive analysis, focusing on IBM Enterprise COBOL on z/OS. Having hands-on experience with IBM Enterprise COBOL on z/OS, we excel in real batch processing, JCL job streams, and debugging. Our approach emphasizes thoroughness and critical evaluation to identify potential pitfalls and offer valuable insights. I'd love to chat about your project! The worst that could happen is you walk away with a free consultation. Regards, Keagon."
$400 USD in 7 days
0.0
0.0

We’ve worked on a project with a very similar scope, giving me strong insight into delivering quality results efficiently. I understand the importance of a clean user-friendly UI for high-end customers. I'd love to chat about your project or walk away with a free consultation. Regards, Nabeel Ismail
$350 USD in 7 days
0.0
0.0

Dear Valued Client I HAVE CREATED SIMILAR BEFORE AND I CAN SHOW YOU. With 10 years+ of experience as an expert Senior Software Engineer and Web Developer, I am HIGHLY confident that I have the skills, experience, and dedication needed to deliver a High-Quality solution that meets your expectations. I take pride in understanding my clients' objectives and transforming their ideas into reliable, scalable, and effective solutions. Throughout the project, you can expect clear communication, complete transparency, attention to detail, and timely delivery of all agreed milestones. I WILL PROVIDE 2 YEARS OF FREE ONGOING SUPPORT for maintenance, optimization, bug fixes, and future enhancements. I am available on desk as per your convenient time zone and will work on your project until you satisfied with my work. Kind Regards, Phakisang Molefe Senior Software Engineer
$400 USD in 7 days
0.0
0.0

Hello. After reading the project description, it appears to be a very interesting technical problem with a clear scope. To be honest, I hold a Certified Public Accountant (CPA) license and have experience in system/process review, control logic verification, and converting complex technical processes into clear and testable specifications. However, I do not have direct experience writing or debugging IBM Enterprise COBOL in a z/OS environment, nor do I have direct experience working in a JCL batch environment. Therefore, practical experience with mainframe COBOL is essential. The framework consisting of 13 questions seems to perfectly align with a structured review method that I can refine from a specification and verification perspective and use for stress testing. However, for verifying accuracy in a real-world operating environment, I recommend working with a z/OS COBOL engineer. If necessary, I can restructure the questions into a "risk checklist" that clearly illustrates the areas where implementation methods, such as GnuCOBOL-based verification, commonly fail in actual enterprise environments. I would like to discuss this in more detail to determine if this hybrid approach would be useful for your company's workflow.
$300 USD in 3 days
0.0
0.0

OVERWHELMED With all the Ai Generated proposals. Give me a few seconds to show you why I am different. I've built a tool for service businesses that automates legacy COBOL analysis. Your need for a technical review aligns with my expertise in IBM Enterprise COBOL on z/OS. I would love to chat about your project, the worst that can happen is you walk away with a free consultation. Regards, Clinton.
$350 USD in 7 days
0.0
0.0

"We recently wrapped up a project very similar to this, helping a client streamline their legacy system processes. We've built a website for service businesses, ensuring a clean, professional, and user-friendly experience. I understand the critical need for a detailed technical review of your COBOL program. With our expertise in IBM Enterprise COBOL on z/OS and real batch processing, we can provide comprehensive insights into your specific questions. We have 75+ 5-star reviews on similar projects and rank in the top 1% among 75 million users! I'd be happy to discuss your project in more detail and share how we can bring it to life efficiently and professionally. Best case, we work together. Worst case, you get free advice that helps you move forward. Regards, Martinus."
$550 USD in 7 days
0.0
0.0

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