Decilog Inc

Secure Software for Mission-Critical Systems

Website

About the firm

Decilog was founded more than 50 years ago by John Marchesano, a business-minded engineer from Long Island, New York. It operates as a quick-reaction technical services provider, delivering scientific, engineering, and management support to government and commercial clients. The practice solves sophisticated problems and offers services relating to conceptual design, requirements development, systems analysis, software engineering, rigorous testing, software assurance, and training. A particular strength is developing and testing leading-edge security-critical control and information systems.

Firm type
Simulation Engineering · Software Engineering

Capabilities

Systems Engineering

Service website

Delivering structured engineering processes to analyze, design, and integrate complex technologies for critical applications.

  • Systems Analysis

    Evaluating system components and performance parameters to ensure mission objectives are met.

  • Systems Integration

    Unifying diverse software and hardware modules into cohesive, functional operational environments.

  • Conceptual Systems Design

    Formulating high-level architectures and engineering frameworks for complex control environments.

  • Requirements Development

    Eliciting, analyzing, and documenting exact software and hardware specifications for complex systems.

Software Engineering

Service website

Building secure, high-integrity applications for control systems and information environments.

  • Mission-Critical Software Development

    Coding robust, secure software suites designed to perform reliably under severe operational constraints.

  • Secure Software Design

    Architecting applications with integrated cyber defenses and failure-resistant control structures.

  • Application Programming

    Developing custom instructions and scripts to execute specialized logic on target processors.

  • Software Conversion Support

    Migrating and updating legacy source codebases into contemporary programming frameworks.

  • System Implementation Support

    Deploying, configuring, and tuning fresh software installations inside production systems.

System Verification and Assurance

Service website

Performing rigorous testing and quality control to ensure safe and reliable operations under demanding conditions.

  • Rigorous System Testing

    Subjecting hardware and software assemblies to comprehensive scenarios to identify faults.

  • Software Quality Assurance

    Conducting formal audits and mathematical verifications to ensure codebase compliance with security standards.

Simulation and Training

Service website

Creating operational mockups and instruction programs to facilitate system readiness and team preparation.

  • System Simulation

    Modeling physical assets and operational threats in synthetic software environments.

  • Operator Training Programs

    Providing curriculum design and technical instruction to prepare personnel for mission success.

Information Technology and Data Services

Service website

Designing and managing the databases and networks that form the backbone of modern communications.

  • Database Planning and Design

    Structuring safe, high-availability schemas for structured and unstructured mission data.

  • Network Infrastructure Services

    Designing and maintaining reliable transmission channels for secure information transfer.

  • Data and Records Management

    Implementing retention policies, archiving protocols, and access controls for secure database operations.

Industries

Defense · Government · Public Safety · Intelligence & National Security

Projects

Apache Helicopter Programs Support

Defense · 2025

Project details

Providing continuing technical and engineering support for the AH-64D and AH-64E Apache Helicopter programs.

Paladin SPH Programs Support

Defense · 2025

Project details

Providing engineering and systems support for the M109A5, M109A6, and M109A7 Paladin Self-Propelled Howitzer (SPH) programs.

LHMBC Program Support

Defense · 2025

Project details

Delivering continuous systems and software engineering support for the LHMBC program.