My name is Aaron Barczewski (pronounced “bar-chess-ski”), and I am a software engineer with nearly a decade of experience designing and building backend systems across the defense, marketing, and telecommunications industries. I specialize in developing scalable services and distributed systems using API-driven architectures, with a strong focus on performance, reliability, and maintainable system design.
I graduated from Colorado State University in 2016 with a Bachelor’s degree in Computer Science. Prior to my career in software engineering, I served in the United States Army as an intelligence analyst and deployed to Afghanistan in 2010.
Outside of engineering, I enjoy astrophotography—capturing images of deep-space objects—designing and building rockets, and playing the drums.
About Me
Software engineer specializing in designing scalable backend systems, APIs, and event-driven architectures for complex and security-sensitive environments.
Experienced in building custom frameworks, platform infrastructure, and clean architectural foundations that improve long-term maintainability and developer velocity.
Proven track record delivering high-reliability SaaS and data systems across defense, communications, and marketing technology domains.
Collaborative technical leader who mentors engineers, drives engineering standards, and solves complex system design challenges end-to-end.
Skills
Technical Skills
Languages & Backend Development: PHP, Python, JavaScript, SQL, C#, ASP.NET
Architecture & Backend Systems: API Design, RESTful Services, Event-Driven Architecture, Clean Architecture, Dependency Injection, OAuth2, Microservices Concepts, Domain Modeling
Frameworks & Frontend: Laravel, Vue.js, React, HTML5, CSS3, JavaScript, jQuery
Databases & Data Systems: MySQL/MariaDB, AWS Aurora or RDS, DynamoDB, Query Optimization, ORM Design, Event Sourcing, Event Dispatching
Cloud & Infrastructure: AWS (S3, Aurora,DynamoDB), Docker, CI/CD Pipelines
Testing & Engineering Practices: PHPUnit, Automated Testing, Secure Coding Practices, Code Reviews, Agile/Scrum/Kanban
Tools & Collaboration: GitHub, Git, Pair Programming, Technical Mentorship
Experience
Precise Systems, Inc, – Lexington Park, Maryland (remote) | Senior Software Engineer | September 2024 - December 2025
Developed and architected a scratch-built MVC SaaS platform and external API for the U.S. Department of Defense within a no-framework environment driven by strict security and compliance requirements. Provided technical leadership through architecture ownership, security hardening, and developer mentorship.
- Established clean architecture and separation-of-concerns patterns across a custom PHP MVC system, enabling scalable feature development without framework dependencies.
- Designed and implemented a PSR-aligned dependency injection container supporting inversion of control and improved automated testing workflows.
- Built a custom HTTP routing engine with middleware pipeline architecture to support RESTful APIs and cross-cutting concerns.
- Designed a scalable file upload and storage subsystem using AWS S3 with secure object association and access handling.
- Implemented a custom indexing and search solution optimized for rapid querying of domain entities.
- Performed security hardening across the application, identifying and eliminating SQL injection, CSRF, and XSS attack vectors.
- Designed a reusable API framework including routing, dependency resolution, request/response transformation, and extensibility mechanisms.
- Implemented OAuth2 authorization using RSA key pairs and JWK token validation for secure third-party integrations.
- Introduced event sourcing into the inventory domain, improving traceability, consistency, and system resilience.
- Led peer code reviews and mentored junior developers, improving design consistency and reducing defects.
PhoneBurner Inc, Laguna Beach, CA | Sr. Software Engineer | March 2021 - August 2024
Actively contributed to a software engineering team utilizing Agile methodologies to maintain and enhance a Laravel-based monolithic web application with a robust API-driven and event-driven architecture in PHP. Developed efficient HTTP clients for interacting with external APIs. Improved the user experience by writing Vue.js components and maintaining legacy code in HTML, CSS, JavaScript, and jQuery.
- Developed a PHP and Vue.js application to screen illicit recorded voicemails, significantly enhancing customer security and phone traffic safety.
- Implemented an asynchronous listener system that serializes Doctrine ORM entities in PHP, which greatly improved platform reliability and performance.
- Enhanced the phone number ordering system in PHP and Vue.js, providing users with a more reliable and seamless experience when purchasing phone numbers through the platform.
- Built and improved the number inventory API with event sourcing, significantly boosting data consistency and enhancing the overall user experience.
Madwire LLC, Fort Collins, CO | Software Engineer | March 2018 - March 2021
Responsible for designing, building, and maintaining PHP applications that aggregated marketing and advertising data from external sources such as Google, Facebook, and LinkedIn that were stored in AWS Aurora databases. Additionally, I contributed to developing an internal API that utilized this data to provide customers with reporting and analysis for their ad campaigns.
- Developed a custom Active Record ORM library in PHP that was compatible with both MySQL and Aurora, to seamlessly bridge the database and business logic across multiple applications. This innovation greatly improved flexibility and reduced system complexity.
- Designed and implemented a Python API with Flask to automate database migrations for over 1,000 databases leading to substantial improvements in performance and consistency.
- Engineered and optimized MySQL queries to enhance memory efficiency and overall system performance resulting in significantly faster page load times for large customers.
Smart Software Solutions LLC, Pierre, SD | Full Stack Web Developer | June 2017 - Feb 2018
Developed LAMP stack web applications utilizing HTML, CSS, JavaScript, and jQuery to create reliable and visually appealing platforms tailored to individual customer needs. Additionally, I maintained and implemented new features in both WordPress and Java applications.
- Developed a custom queuing system in PHP and MySQL for a taxi service application, significantly enhancing both performance and reliability.
- Optimized and refined MS-SQL queries for a Java application, leading to substantial performance improvements and an enhanced user experience.
- Designed and built a Java application to parse raw data from files to generate MySQL scripts, dramatically increasing productivity for client products requiring MySQL database seeding.
- Created a C# application to retrieve data from an external stock trading API, enriching a WordPress application with real-time trading information.
Education
Bachelors of Science in Computer Science - Colorado State University, Fort Collins, CO
Bachelors of Science in Microbiology - Colorado State University, Fort Collins, CO
Astrophotography
I started doing astrophotography near the end of 2020. I stumbled onto it by watching YouTube videos and was amazed by the spectacular pictures one could take with pretty simple equipment. After taking my first picture, which was the Orion Nebula (shown on the left), I was hooked and began my journey in making higher quality pictures.