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As400 Testing Jobs in Michigan (NOW HIRING)

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As400 Testing information

What is an AS400 Testing?

An AS400 Testing job involves evaluating applications running on the IBM AS400 (now IBM i) platform to ensure functionality, performance, and security. Testers work with RPG, COBOL, CL, and DB2-based applications, executing test cases, identifying bugs, and validating system outputs. They use manual and automated testing techniques, including unit testing, system testing, and regression testing. The role requires knowledge of AS400 commands, database structures, and business logic implementation.

What are the typical responsibilities and challenges of AS400 Testing?

AS400 Testing professionals are responsible for designing and executing test cases, validating data integrity, and ensuring that business applications on the AS/400 platform run as intended. A common challenge in this role is working with complex legacy code and systems that may lack thorough documentation, which requires testers to be resourceful and detail-oriented. Testers also collaborate closely with developers, business analysts, and end-users to understand requirements, troubleshoot issues, and verify fixes. The work environment often involves both independent analysis and teamwork, and there's ample opportunity to develop expertise in legacy modernization projects or transition into test lead or quality assurance roles.

What are the key skills and qualifications needed for AS400 Testing, and why are they important?

To thrive in AS400 Testing, you need a solid understanding of IBM AS/400 (iSeries) environments, RPG/COBOL programming languages, and knowledge of software testing methodologies. Familiarity with tools such as IBM Rational, Selenium, or other test automation frameworks, along with ISTQB certification, is often beneficial. Strong analytical thinking, problem-solving abilities, and clear communication skills help testers collaborate effectively and report findings. These competencies ensure the delivery of robust, high-quality business applications on legacy systems, minimizing risks and defects.

What are the most commonly searched types of As400 Testing jobs in Michigan?

The most popular types of As400 Testing jobs in Michigan are:

What are popular job titles related to As400 Testing jobs in Michigan?

For As400 Testing jobs in Michigan, the most frequently searched job titles are:

What job categories do people searching As400 Testing jobs in Michigan look for?

The top searched job categories for As400 Testing jobs in Michigan are:

Infographic showing various As400 Testing job openings in Michigan as of August 2026, with employment types broken down into 1% As Needed, 81% Full Time, 12% Part Time, 4% Contract, and 2% Nights. Highlights an 87% Physical, 3% Hybrid, and 10% Remote job distribution.

Attest Services-IT Audit Manager

Grant Thornton

Southfield, MI • On-site

Full-time

Medical, Dental, Vision, Retirement

Re-posted 6 days ago


Grant Thornton rating

8.3

Company rating: 8.3 out of 10

Based on 9 frontline employees who took The Breakroom Quiz

8th of 23 rated bookkeepers and accountants


Job description

As an IT Assurance Manager you will use your technical and leadership skills to oversee completion of IT general control audits. You'll apply your knowledge of each client's operations, processes and risks to support financial statement opinions and enhance IT assurance services - all with the resources, environment and support to help you excel. You will build relationships with your clients and your engagement team while working collaboratively to improve the client's overall financial reporting processes, and help them better understand their IT processes and areas of risk. From day one, you'll be empowered with access to firm leaders and mentors, training programs, resource groups, team-based communities, and growth opportunities to help you develop your career and achieve more, confidently.

Your day-to-day may include:

  • Overseeing multiple client engagements, including scoping, project scheduling, quality review and managing to budget
  • Listening and communicating clearly with clients about engagement expectations and assessment of each organization's level of risk
  • Planning, executing and completing engagements to evaluate and test IT controls and identify areas of risk and providing support to financial statement audits
  • Working with clients and audit teams to identify and promptly resolve audit-related issues
  • Teaming with Grant Thornton colleagues on proposals and business development activities
  • Training and supervising less experienced team members and providing consistent, regular feedback
  • Working at a client site, with your team in the office or remotely. We empower teams to listen first to expectations of clients and teammates; then you and your team can determine when and where to work. No matter when or where, you will have the support you need to thrive
  • Representing Grant Thornton at recruiting and professional networking events
  • Building your technical and professional skills through formal training
  • Other duties as assigned

You have the following technical skills, qualifications and abilities:

  • Bachelor's degree in accounting, finance, IT, MIS or related disciplines
  • A CISA certification or other relevant certification or license is required
  • Minimum six years of relevant experience in public accounting or equivalent field, delivering controls-based services with exposure to Information Technology General Controls for financial statement audits; deep understanding of generally accepted practices for testing key reports and application controls; technical expertise (SAP, Oracle, JD Edwards, NetSuite, etc.) is a plus
  • Knowledge of access control software, security architecture and administration, internet use/firewalls, network security awareness and enforcement, security policies and standards, operating systems (Windows, UNIX, AS400, Mainframe), and databases
  • Can manage multiple engagements and competing priorities
  • Value teamwork, are agile and know the power of building strong relationships
  • Excellent verbal and written communication skills

#LI-CL2

At Grant Thornton, we believe in making business more personal and building trust into every result - for our clients and you. Here, we go beyond your expectations of a career in professional services by offering a career path with more: more opportunity, more flexibility, and more support. It's what makes us different, and we think being different makes us better. 
In the U.S., Grant Thornton delivers professional services through two specialized entities: Grant Thornton LLP, a licensed, certified public accounting (CPA) firm that provides audit and assurance services - and Grant Thornton Advisors LLC (not a licensed CPA firm), which exclusively provides non-attest offerings, including tax and advisory services.
In 2025, Grant Thornton formed a multinational, multidisciplinary platform with Grant Thornton Ireland. The platform offers a premier Trans-Atlantic advisory and tax practice, as well as independent American and Irish audit practices. With $2.7 billion in revenues and more than 50 offices spanning the U.S., Ireland and other territories, the platform delivers a singular client experience that includes enhanced solutions and capabilities, backed by powerful technologies and a roster of 12,000 quality-driven professionals enjoying exceptional career-growth opportunities and a distinctive cross-border culture.
Grant Thornton is part of the Grant Thornton International Limited network, which provides access to its member firms in more than 150 global markets.The team you're about to join is ready to help you thrive. Here's how:
 Whether it's your work location, weekly schedule, or flex time off, we empower you with the options to work the way that it best serves your clients and your life. Consistent with the firm's hybrid work model, this position will require in-person attendance at least three days per week, either at a GT office or client site.
Here, you are supported to prioritize your overall well-being through work-life integration options that work best for you and those in your household. 
We understand that your needs, responsibilities and experiences are different - and we think that's a good thing. That's why we support you with personalized and comprehensive benefits that recognize and empower all the identities, roles and aspirations that make you, well, you. See how at www.gt.com/careers
When it comes to inclusion, we are committed to doing more than checking boxes. Explore all the ways we're taking action for diversity, equity & inclusion at www.gt.com/careers

Here's what you can expect next: 
If you apply and are selected to interview, a Grant Thornton team member will reach out to you to schedule a time to connect. We encourage you to also check out other roles that may be a good fit for you or get to know us a little bit better at www.gt.com/careers. 

Benefits:
We understand that your needs, responsibilities and experiences are different, and we think that's a good thing. That's why we support you with personalized and comprehensive benefits that recognize and empower all the identities, roles and aspirations that make you, well, you. For an overview of our benefit offerings, please visit: https://www.grantthornton.com/careers/rewards-and-benefits
  • Benefits for internship positions: Grant Thornton interns are eligible to participate in the firm's medical, dental and vision insurance programs and the firm's employee assistance program. Interns also receive a minimum of 72 hours of paid sick leave, and are paid for firm holidays that fall within their internship period.
  • Benefits for seasonal employee positions: Grant Thornton seasonal employees are eligible to participate in the firm's medical, dental and vision insurance programs and the firm's employee assistance program. Seasonal employees may also be eligible to participate in the firm's 401(k) savings plan and employee retirement plan in accordance with applicable plan terms and eligibility requirements. Seasonal employees receive a minimum of 72 hours of paid sick leave. 
Grant Thornton employees may be eligible for a discretionary, annual bonus based on individual and firm performance, subject to the terms, conditions and eligibility criteria of the applicable bonus plan or program. Interns and seasonal employees are not eligible for bonus compensation.

Additional Details:       
It is the policy of Grant Thornton to promote equal employment opportunities. All personnel decisions (including, but not limited to, recruiting, hiring, training, working conditions, promotion, transfer, compensation, benefits, evaluations, and termination) are made without regard to race, color, religion, national origin, sex, age, marital or civil union status, pregnancy or pregnancy-related condition, sexual orientation, gender identity or expression, citizenship status, veteran status, disability, handicap, genetic predisposition or any other characteristic protected by applicable federal, state, or local law. 

Consistent with the Americans with Disabilities Act (ADA) and applicable state and local laws, it is the policy of Grant Thornton to provide reasonable accommodation when requested by a qualified applicant or employee with a disability, unless such accommodation would cause an undue hardship. The policy regarding requests for reasonable accommodation applies to all aspects of employment, including the application process. To make an accommodation request, please contact HRHelp@us.gt.com. 

For Los Angeles Applicants only: We will consider for employment all qualified Applicants, including those with Criminal Histories, in a manner consistent with the requirements of applicable state and local laws, including the City of Los Angeles' Fair Chance Initiative for Hiring Ordinance.

For Massachusetts Applicants only:  It is unlawful in Massachusetts to require or administer a lie detector test as a condition of employment or continued employment. An employer who violates this law shall be subject to criminal penalties and civil liability. Grant Thornton does not require or administer lie detector tests as a condition of employment or continued employment.

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About Grant Thornton

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At Grant Thornton, we believe in making business more personal and building trust into every result - for our clients and you. Here, we go beyond your expectations of a career in professional services by offering a career path with more: more opportunity, more flexibility, and more support. It's what makes us different, and we think being different makes us better.

Industry

Accounting services

Company size

5,001 - 10,000 Employees

Headquarters location

Chicago, IL, US

Year founded

1924