Hollen Graver
Email: graverhollen@gmail.com 
LinkedIn: linkedin.com/in/hollen-graver-92189941 | Website: hollengraver.com | Github: github.com/mrhollen
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Summary
Highly experienced software developer with over a decade of expertise in building impactful software tools across Java/Angular/AWS/C#/TypeScript/Go. Passionate about code quality, AI/machine learning, and building easy-to-maintain and highly scalable software. Seeking a fulfilling career to leverage my skills and contribute to impactful projects.
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Campspot
Senior Software Developer Level 2 | March 2024 – Present
* Led the development of numerous large features and supported the maintenance of the primary Campspot B2C product (campspot.com), ensuring high-quality user experience, actively mitigating and handling credit card fraud, and supporting tens of thousands of daily users
* Helped refine usage of AI coding tools and explored implementation of AI-powered Customer Support Chatbots
* Hired, onboarded, and mentored more junior developers, enhancing team performance and skill growth
* Developed and maintained Campspot’s customer-facing mobile application 
* Developed applications using Java, Kotlin, TypeScript in AngularJS, Angular, Flutter/Dart
* All applications and infrastructure deployed to AWS
* Utilized PostgreSQL, MySQL, Elasticsearch, OpenSearch, Redis for search and database management to optimize application performance and data handling
Senior Software Developer Level 1 | April 2022 – March 2024
* Maintained and developed code processing millions of dollars of payments daily
* Designed and deployed a new gift card system that was adopted by hundreds of clients, significantly boosting customer engagement and revenue streams
* Built and maintained invoicing and in-house Point of Sale systems crucial to daily campground operations
* Developed and integrated new features that significantly improved the user experience, increasing user satisfaction and retention rates
 Software Developer Level 2 | July 2019 – April 2022
* Assisted in software development and maintenance including enterprise level discount and promo code management at many parks simultaneously 
* Migrated features from a legacy Node with TypeScript backend to a Java backend
* Contributed to feature rollouts, improving functionality
* Worked with Java, Kotlin, TypeScript, AngularJS, Angular, PostgreSQL, MySQL, Elasticsearch, OpenSearch, Redis, NodeJS, ExpressJS
PRSM Healthcare
Software Engineer | June 2014 – May 2019
* Developed and maintained applications, collaborated with cross-functional teams
* Integrated key customer outreach software with VoIP technologies based on FreePBX
* Supported 2x client growth
* Facilitated complex data delivery to stakeholders
* Engineered a fault-tolerant system using redundant VPN connections and load balancing to maintain connections to client systems critical to call center staff
* Worked extensively with C#, .NET, .NET Core, TypeScript, Angular, AngularJS
* Rewrote the core business application supporting both B2B and internal tooling from PHP to C# ASP.NET
* Migrated all business applications from on-prem to Microsoft Azure and finally to AWS
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Education
B.Sc. in Computer Information Science: Information Systems 
Mansfield University of Pennsylvania 
Graduated: 2014 
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Skills
Technical:
Languages: Java, Kotlin, JavaScript/TypeScript, Go, Python, C#, Dart
Frameworks & Libraries: AngularJS, Angular 2+, Flutter, .NET, .NET Core
Databases & Search: PostgreSQL, MySQL, SQLite, Elasticsearch, OpenSearch, Redis, Valkey
Infrastructure & DevOps: AWS, Docker, Kubernetes (K3s), ArgoCD, Arch Linux, Prometheus, Grafana, Load Balancing, Message Queues
AI & Machine Learning: LLMs, Local Model Deployment (Qwen, Llama.cpp), LLM Agents, MCP, Diffusion-Based Image Generators
Core Engineering: Fault-Tolerant System Design, REST API Development, Software Testing including TDD, Debugging, Code Reviews


Soft Skills:
Communication, Team Collaboration, Pair Programming, Problem-Solving, Mentorship, Adaptability, Attention to Detail, Teaching, Project Management