Summary
Overview
Work History
Education
Skills
Timeline
SoftwareDeveloper

Timothy Singletary

San antonio

Summary

Senior Test Engineer with active Secret clearance and experience supporting federal modernization efforts for the Department of Defense and law enforcement systems. Proven expertise in mainframe-to-cloud migration testing, structured message validation, API integration testing, and frontend development using Angular. Skilled in designing test plans, validating system interoperability, and ensuring data integrity across distributed environments.

Overview

2
2
years of professional experience

Work History

Senior Test Engineer

Appddiction Studio Defense Threat Reduction Agency (DTRA) Contract
San Antonio, TX
03.2025 - Current
  • Support the modernization of national criminal justice systems, transitioning from mainframe architecture to cloud-based infrastructure.
  • Designed and executed thorough testing strategies to ensure seamless integration of DDL-formatted message exchanges across legacy and cloud platforms.
  • Conducted comprehensive integration testing to guarantee precise data transformation and alignment of outputs across mainframe and cloud systems.
  • Executed validation of authorization and role-based access controls across system modules.
  • Created and optimized Groovy scripts for ReadyAPI, focusing on automating assertion validation and improving response cleanup efficiency.
  • Executed structured message testing aimed at enhancing the accuracy of real-world record simulations.
  • Engaged with cross-functional teams to streamline identification, documentation, and verification of defect resolutions in Jira.

Software Developer

Appddiction Studio Federal Bureau of Investigation Contract
San Antonio, TX
06.2024 - Current
  • Managed active secret clearance to facilitate support for critical Department of Defense systems.
  • Created robust Angular components and dynamic forms, ensuring functionality and responsiveness for high-priority frontend applications.
  • Executed integration of frontend components with REST APIs, prioritizing secure data exchange protocols.
  • Analyzed and corrected role-based access control issues, improving overall user authorization processes.
  • Implemented targeted Java improvements to optimize Spring Boot architecture.
  • Conducted thorough SQL data validation and debugging to ensure accuracy and reliability of relational database information.
  • Collaborated in agile development cycles to perform regression testing and ensure effective defect tracking.
  • Collaborated with designers to enhance user experience through responsive design principles.

Education

Web Design

CodeUp
San Antonio, TX
10-2023

Skills

    Languages: TypeScript, Java (limited backend exposure), SQL, Groovy
    Frontend: Angular, Bootstrap
    API Testing: ReadyAPI, Postman
    Databases: PostgreSQL, MySQL
    Version Control: Git, Bitbucket, GitLab
    Tools: Jira, Confluence, VS Code, PuTTY, Citrix
    Testing Types: Integration Testing, System Testing, Regression Testing, Authorization Testing, Edge Case Validation
    Concepts: REST APIs, JSON validation, Role-Based Access Control (RBAC), Cloud Migration Testing

Timeline

Senior Test Engineer

Appddiction Studio Defense Threat Reduction Agency (DTRA) Contract
03.2025 - Current

Software Developer

Appddiction Studio Federal Bureau of Investigation Contract
06.2024 - Current

Web Design

CodeUp
Timothy Singletary