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100% Remote:: MS DOS 4.0 Developer

TekIntegral Inc.CA🇺🇸United States

Quick overview

SeniorityMid Senior
Work modeRemote
LocationCA, United States
AssemblyC

Job description

Who We Are:

TekIntegral Inc. isn't just another staffing company, we're a hub of innovation, connecting top talent with the client needs.

Recognized for 140% growth in the past three years.

Our Moto - Right Talent. Right Time. Right Place. Right Price.

Please find below the job description.

Position: MS DOS 4.0 Developer
Location: Remote
Type: Contract

Visa: "The client is not willing to sponsor visas at this time." "

Description:

Skills Required: Must have

  • A contract requirement for a MS-DOS 4.0 (not PC DOS 4.0) developer

Technical Expertise

  • Strong knowledge of MS-DOS 4.0 internals (not PC-DOS): kernel structure, multitasking features, memory management changes introduced in MS-DOS 4.0.
  • Proficiency in x86 Assembly (8086/80286).
  • Strong C programming skills targeting real-mode DOS environments.
  • Experience with DOS interrupts (especially INT 21h, INT 10h, INT 13h, INT 16h, etc.).
  • Knowledge of FAT16 file system internals.
  • Hands-on experience with TSR programming and interrupt hooking.

Tools & Environment

  • Experience using MASM/TASM, Borland/Turbo C, Microsoft C compilers.
  • Familiarity with legacy debugging tools (DEBUG, SYMDEB, CodeView).
  • Ability to work with old build environments, floppy-disk boot images, and vintage hardware/emulators (e.g., DOSBox, PCem, 86Box).

Soft Skills

  • Strong problem-solving skills for reverse-engineering or restoring undocumented legacy code.
  • Ability to work independently with minimal documentation.
  • Excellent communication skills for documenting complex legacy processes.


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Why Work with us ?

TekIntegral is an equal opportunity employer, dedicated to fostering a workplace where diverse talents and perspectives are valued.

We make all employment decisions based on merit, ensuring a culture of respect, fairness, and opportunity for all, regardless of age, gender, ethnicity, disability, or other protected characteristics.

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