Combine testct and ctclient on same line across all resumes
Updated all resumes that list open source projects to consolidate testct and ctclient into a single bullet point since both are Certificate Transparency related tools with similar purposes (testing, validation, monitoring). Updated resumes: - paul-halvorsen-resume-detailed.md (main detailed resume) - stealth-startup/backend-developer/paul-halvorsen-resume.md - collette/software-engineer-ii/paul-halvorsen-resume.md - lemans/backend-software-engineer/paul-halvorsen-resume.md - tenstorrent/devrel-engineer/paul-halvorsen-resume.md Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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paul
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stealth-startup/backend-developer/paul-halvorsen-resume.md
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stealth-startup/backend-developer/paul-halvorsen-resume.md
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---
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name: Paul Halvorsen
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keywords: python, backend developer, REST API, database management, security, MySQL, git, docker, testing, performance optimization
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left-column:
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- "Email: paul.halvorsen@pm.me"
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- "Phone: +1-410-236-4665"
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right-column:
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- "GitHub: github.com/malwhile"
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- "LinkedIn: linkedin.com/in/paul-halvorsen"
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- "Blog: flow.halvo.me"
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fontsize: 10pt
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fontenc: T1
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urlcolor: blue
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linkcolor: magenta
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numbersections: false
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---
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## Professional Summary
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Backend Engineer with 15+ years of experience developing scalable server-side applications, REST APIs, and database systems. Expert in Python, MySQL, and test-driven development with a proven track record of optimizing backend performance and implementing security best practices. Passionate about building reliable infrastructure and writing clean, testable code.
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## Core Technical Skills
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**Languages:** Python (Advanced), Rust, C, GoLang | **Databases:** MySQL, SQLite, SQL/NoSQL | **Backend:** REST APIs, JSON, Nginx | **DevOps:** Docker, Git/GitLab CI/CD | **Testing:** Pytest, Unit Testing, Integration Testing | **Security:** Encryption (RSA, AES), Authentication, Data Protection | **Frameworks & Tools:** Tokio, TDD, pytest
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## Professional Experience
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### Software Engineer | Abnormal AI
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\resumedate{**January 2026 – Present**}
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- Develop and maintain Python-based data aggregation services for multi-region deployments (US East, US West, EU West)
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- Design and optimize real-time storage and long-term data management systems handling customer data at scale
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- Implement performance optimizations including auto-scaling and compression, improving efficiency by up to 70%
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- Write comprehensive unit and integration tests using pytest; maintain high test coverage
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- Collaborate with 5-person team on monorepo architecture and continuous integration pipelines
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- Build and manage infrastructure using GoLang and Python for data pipeline orchestration
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### Sr Software Engineer | Binary Defense
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\resumedate{**April 2022 – October 2025**}
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- Architected and implemented Python backend libraries for cross-platform event monitoring (Windows, Linux, macOS)
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- Designed REST APIs for secure communication between client endpoints and backend services
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- Optimized backend services, achieving 60-80% improvements in memory and network traffic reduction through intelligent filtering and compression
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- Implemented encrypted SQLite database layers with secure key storage (DPAPI, freedesktop.secrets)
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- Built end-to-end integration testing framework spinning up pre-configured VMs and automated test servers
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- Executed performance profiling and optimization on data processing pipelines handling millions of events
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- Developed Python libraries for network traffic monitoring with event-driven architecture and regex-based filtering
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- Maintained CI/CD pipelines (GitLab) for compilation, testing, and deployment across platforms
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- Implemented security hardening: public key pinning, certificate transparency validation, secure key exchange protocols
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### Security Software Engineer | Parsons
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\resumedate{**April 2018 – November 2020**}
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- Designed and built back-end file storage service supporting concurrent multi-user access with role-based access control (RBAC)
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- Implemented REST API for file management with web and CLI interfaces
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- Managed MySQL database with advanced indexing and optimization strategies
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- Developed data deduplication logic to eliminate redundant storage and support multi-user read access
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- Built custom serialization protocol optimizing network traffic and data transfer
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- Implemented LDAP integration for enterprise user authentication
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### Security Software Engineer | NSA
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\resumedate{**November 2011 – April 2018**}
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- Designed and maintained MySQL databases holding CVE data, exploit information, and system fingerprints
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- Built REST JSON APIs for real-time data transfer between web interfaces and backend services
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- Implemented query optimization and indexes reducing query latency by 50%+
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- Developed backend web services using PHP, Python, and Java supporting thousands of concurrent users
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- Created secure communication protocols and custom serialization for limited-bandwidth environments
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- Deployed backend systems on Tomcat, Apache, and Nginx across Linux and Windows platforms
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### Systems Engineer | NSA
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\resumedate{**September 2009 – November 2011**}
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- Managed infrastructure supporting 130+ RHEL servers across 10+ systems
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- Developed Python automation scripts for system monitoring, health checks, and remediation
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- Built reporting systems integrating with Web APIs for real-time alerting and status tracking
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### Software Developer | Salisbury University
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\resumedate{**November 2006 – May 2008**}
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- Built C++ backend for risk assessment system supporting real-time data processing and reporting
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- Designed database schema for scenario storage and analysis
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- Collaborated with Geographic Information Systems team to integrate maps and spatial data
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## Education
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**Master of Science in Computer Science** | University of Maryland Baltimore Campus (2013)
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- Thesis: "Stateless Detection of Malicious Traffic: Emphasis on User Privacy"
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**Bachelor of Science in Computer Science** | Salisbury University (2009)
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- Graduated Magna Cum Laude
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## Security Clearance & Certifications
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- CompTIA Security+ (Expired 04/04/2024)
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- Expired TS/SCI Clearance
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## Open Source & Projects
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- **testct** & **ctclient** (Rust) - Certificate transparency testing, validation, and monitoring tools
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- **baseball-nn** (Python) - Machine learning project using TDD and pytest
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- **sjles-pta-vote** (Go, TypeScript) - Full-stack community platform with REST APIs
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