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As400 Programmer Jobs in Washington (NOW HIRING)

M.C. Dean, Inc

Accounts Payable 2 - Tysons, VA

Tysons, VA · On-site

$19.50 - $24.50/hr

Our people are passionate about engineering innovation that improves lives and drives impactful ... Accessing financial data within AS400 and internal software systems to answer general questions as ...

M.C. Dean, Inc

Accounts Payable 1 - Tysons, VA

Tysons, VA · On-site

$21.07 - $26.34/hr

Our people are passionate about engineering innovation that improves lives and drives impactful ... Accessing financial data within AS400 and internal software systems to answer general questions as ...

M.C. Dean, Inc

Project Controls, Staff

Bethesda, MD · On-site

$90K - $113K/yr

Our people are passionate about engineering innovation that improves lives and drives impactful ... AS400 (internal) CMMS software * Primavera P6 software We offer an excellent benefits package ...

M.C. Dean, Inc

Project Controls, Associate

Bethesda, MD · On-site

$75K - $94K/yr

Our people are passionate about engineering innovation that improves lives and drives impactful ... AS400 (internal)CMMS software * Primavera P6 software We offer an excellent benefits package ...

M.C. Dean, Inc

Project Controls, Staff

Manassas, VA · On-site

$90K - $113K/yr

Our people are passionate about engineering innovation that improves lives and drives impactful ... AS400 (internal) CMMS software * Primavera P6 software Abilities: * Exposure to computer screens ...

M.C. Dean, Inc

Project Scheduler 1 - Tysons VA

Tysons, VA · On-site

$75K - $113K/yr

Our people are passionate about engineering innovation that improves lives and drives impactful ... AS400 (internal)CMMS software * Primavera P6 software We offer an excellent benefits package ...

Tate

Supply Chain Analyst

Columbia, MD · On-site

$70K/yr

Work in a team environment with manufacturing, project engineers, logistics, and sales to ... Ability to use proprietary systems such as AS400, com, quoting tools, etc. * Extreme proficiency ...

All JobsAs400 Programmer JobsAs400 Programmer Jobs in Washington

As400 Programmer information

See Washington salary details

$112.1K

$116.1K

$118.9K

How much do as400 programmer jobs pay per year?

As of Aug 22, 2026, the average yearly pay for as400 programmer in Washington is $116,091.00, according to ZipRecruiter salary data. Most workers in this role earn between $114,400.00 and $117,800.00 per year, depending on experience, location, and employer.

What is an AS/400 programmer?

AS400 Programmers are IT professionals who specialize in developing, maintaining, and supporting software applications on the IBM AS/400 (now IBM i) platform. They use programming languages like RPG, COBOL, and CL to write and troubleshoot code for business applications, often in industries such as finance, manufacturing, and logistics. Their work involves analyzing user requirements, designing solutions, and ensuring the stability and efficiency of AS400-based systems.

What are the key skills and qualifications needed to thrive as an AS/400 programmer?

To thrive as an AS400 Programmer, you need strong programming skills in RPG, COBOL, or CL, along with a solid understanding of IBM iSeries/AS400 systems and a relevant computer science degree or equivalent experience. Familiarity with tools such as IBM i Navigator, Query/400, and version control systems, as well as experience with database management (DB2), is typically required. Attention to detail, problem-solving abilities, and effective communication skills help you excel in troubleshooting and collaborating with business users. These competencies are essential for maintaining legacy systems, ensuring data integrity, and supporting critical business operations.

What are some common challenges faced by AS/400 programmers when maintaining legacy systems?

AS400 Programmers often encounter challenges such as integrating legacy IBM i systems with modern applications, troubleshooting undocumented or outdated code, and ensuring continued security compliance. Collaboration with business users and IT teams is essential to understand evolving requirements and minimize disruptions during updates or migrations. Staying current with both legacy and new technologies helps programmers bridge the gap between old systems and today’s business needs.
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As400 Programmer jobs near you
Infographic showing various As400 Programmer job openings in Washington as of August 2026, with employment types broken down into 63% Full Time, and 37% Contract. Highlights an 100% In-person job distribution, with an average salary of $116,091 per year, or $55.8 per hour.

Accounts Payable 2 - Tysons, VA

M.C. Dean, Inc

Tysons, VA • On-site

$19.50 - $24.50/hr

Full-time

Re-posted 21 days ago

M.C. Dean rating

7.7

Company rating: 7.7 out of 10

Based on 45 frontline employees who took The Breakroom Quiz

266th of 449 rated engineering

Job description

Overview
About M.C. Dean
M.C. Dean is Building Intelligence. We design, build, operate, and maintain cyber-physical solutions for the nation's most mission-critical facilities, secure environments, complex infrastructure, and global enterprises. With over 7,000 employees, our capabilities span electrical, electronic security, telecommunications, life safety, automation and controls, audiovisual, and IT systems. Headquarters in Tysons, Virginia, M.C. Dean delivers resilient, secure, and innovative power and technology solutions through engineering expertise and smart systems integration.
Why Join Us?
Our people are passionate about engineering innovation that improves lives and drives impactful change. Guided by our core values-agility, expertise, and trust-we foster a collaborative and forward-thinking work environment. At M.C. Dean, we are committed to building the next generation of technical leaders in electrical, engineering, and cybersecurity industries.
Responsibilities
The Accounts Payable II is an entry-level position responsible for performing essential administrative duties to support accounts payable processing. Competent in several phases of an operation. Requires instruction and guidance and refers problems to others. Develops solutions to problems of limited scope.
Responsible for:
  1. Assisting with the set up of yearly Accounts Payable (AP) accounts.
  2. Assisting with the inspection of purchase orders, proofs of delivery for accuracy.
  3. Assisting with filing and record keeping for invoices and support documentation as required.
  4. Filing, copying, faxing, maintaining files, and performing other basic administrative duties related to the Accounts Payable Service Center as assigned.
  5. Reconciling and reviewing statements for minor vendors.
  6. Accessing financial data within AS400 and internal software systems to answer general questions as well as those related to specific accounts.
  7. Performing data entry functions within accounting software systems
  8. Classifying, recording and summarizing numerical and financial data as required.
  9. Gaining a working knowledge of M.C. Dean's policies and procedures regarding purchase orders, subcontracts and invoices.
  10. Assisting Accounts Payable staff with clerical duties as needed
  11. Participating in training activities for AP Online and AS400 which is administered by the Accounts Payable Supervisor.
  12. Participating in Excel Level II training
  13. Participating in the "AP Processes Mentorship Training Program" which is administered by an assigned Accounts Payable II staff member.
  14. Participating in division and department overview training as administered by the Accounts Payable Supervisor.

Qualifications
  1. 2+ years of accounts payable processing experience along with demonstrated ability to utilize MS Excel Level 1 and MS Word with a high school degree or GED
  2. Must have strong attention to detail and strong organization skills.

Abilities
  1. Exposure to computer screens for an extended period of time.
  2. Sitting for extended periods of time.
  3. Reach by extending hands or arms in any direction.
  4. Have finger dexterity in order to manipulate objects with fingers rather than whole hands or arms, for example, using a keyboard.
  5. Listen to and understand information and ideas presented through spoken words and sentences.
  6. Communicate information and ideas in speaking so others will understand.
  7. Read and understand information and ideas presented in writing.
  8. Apply general rules to specific problems to produce answers that make sense.
  9. Identify and understand the speech of another person.

What M.C. Dean employees say

Pay

Benefits

Hours and flexibility

Workplace

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About M.C. Dean

Sourced by ZipRecruiter

M.C. Dean is Building Intelligence®. We design, build, operate, and maintain cyber-physical solutions for the nation's most recognizable mission-critical facilities, secure environments, complex infrastructure, and global enterprises. The company's capabilities include electrical, electronic security, telecommunications, life-safety, instrumentation and control, and command and control systems. M.C. Dean is headquartered in Tysons, Virginia, and employs more than 5,100 professionals who engineer and deploy automated, secure, and resilient power and technology systems; and deliver the management platforms essential for long-term system sustainability.

Industry

Engineering professional services

Company size

10,000+ Employees

Headquarters location

Tysons, VA, US

Year founded

1949

Social media

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