Computer assembler Jobs in Fullerton, CA

Position Title: Senior Application Programmer – Mainframe Systems
Location: 12750 Center Court Drive, Suite 500 Cerritos, CA 90703
Submittal Due: 09/07/2026

Onsite role.
Background Checks: Yes
Livescan Required: No

Position Description: A Senior Application Programmer for Mainframe Systems is responsible for leading and/or working on the most complex IT applications design, documentation, development, modification, testing, installation, implementation, and support of new or existing applications software. The Senior Application Programmer for Mainframe Systems is responsible for analyzing and refining systems requirements; translating systems requirements into applications prototypes; planning and designing systems architecture; writing, debugging and maintaining code; determining and designing applications architecture; determining output media/formats; designing user interfaces; working with customers to test applications; assuring software and systems quality and functionality; integrating hardware and software components; writing and maintaining program documentation; evaluating new applications software technologies; and/or ensuring the rigorous application of information security/information assurance policies, principles and practices to the delivery of application software services.

Skills Required: The Senior Application Programmer for Mainframe Systems will possess knowledge and experience in applications software development principles and methods sufficient to participate in the design, development, testing and implementation of new or modified applications software; organization's operational environment; software design principles, methods and approaches; principles, methods and procedures for designing, developing, optimizing and integrating new and/or reusable systems components; pertinent government regulations; infrastructure requirements, database management principles and methodologies, including data structures, data modeling, data warehousing and transaction processing; functionality and operability of the current operating environment; systems engineering concepts and factors such as structured design, supportability, reliability, scalability and maintainability; optimization concepts and methods; establish and maintain cooperative working relationships with those contacted in the course of the work; and speak and write effectively and prepare effective reports.

Experience Required: This classification must have a minimum of seven (7) years of experience in electronic data processing systems design and programming with one or more of the software set forth below. LANGUAGES: COBOL, Natural/ SuperNatural, IMS/DB/DC, DB2/SQL, Assembler, SAS, CICS; MF FOCUS; TOOLS/UTILITIES: MVS JCL, MVS TSO/ISPF, IBM OPTIM, FILE Manager, SPUFI, ICEMAN/ICETOOLS, SORT, VSAM, CLIST, FTP, DYL260/280, CA Gen (CoolGen), CA Endevor, CA Spool, CA OM Web Viewer, IBM Websphere, Debugger, N2O; DATABASES: DB2, IMS, ADABAS, FOCUS; OS: z/OS; OTHER: EntireX, ASP, HTML, Cloverleaf.

Additional Experience Required: Minimum of seven (7) years of experience with IMS/DB2/COBOL/CICS programming in a mainframe environment.

Education Required: This classification requires the possession of a bachelor's degree in an IT-related or Computer Science field. Additional qualifying experience may be substituted for the required education on a year-for-year basis.

Additional Information: This assignment will require onsite work 5 days (M-F) per week initially and gradually allowing up to 2 days telework depending on the current project requirements. Job site is in located at 12750 Center Court Drive, Suite 500 Cerritos, CA 90703.

Additional Details :

Projected Start Date : 2026-10-13T00:00:00

Projected End Date : 2027-10-12T00:00:00

Client Company : LA County

Vendor Pay Rate : 92.5

Selling points for candidate : Note: Format details. Candidate Name - Calibri 14/Centre. Layout Margin - Narrow. Paragraph setting - No space/0 spacing between lines. Font - Calibri 11. The resume should not be longer than 4-5 pages. The summary should be in 4 to 5 lines. Resume Format: DOCX- Calibri 11 with name only (you need to explain monthly gaps as well in the resume for all positions) portfolio links (if any) should be mentioned in the resume. Note: Only W2, US citizen, or Green Card. Proof of work authorization is required. 10 years Background Check, Employment Check, Education Check, Drug Test.

Candidate must be your W2 Employee : Yes

Candidate must be local : No

Candidate must be authorized to work without sponsorship : No

Interview times set : Yes

Drug Screen : Yes