Hollen Graver
Hollen Graver

Senior Software Developer / Tech Lead

Open to offers · Member since 8 Oct 2026
Location
Denver, United States
Desired salary
Confidential
Work preference
Hybrid / Full Time
Experience level
Lead

About

Professional summary

I am a Senior Software Developer and Tech Lead with more than a decade of experience building and scaling distributed systems, cloud platforms, developer tooling, and customer-facing products.

I specialize in Java, TypeScript, Go, C#, and Python, with experience delivering high-availability transaction workflows, fraud prevention systems, payment pipelines, and multi-tenant business applications.

I lead architecture and delivery for complex cross-domain systems, including event-driven services, enterprise commerce platforms, mobile applications, and full-stack cloud migrations. I value clean architecture, fault tolerance, type safety, and operational reliability.

I enjoy mentoring engineers through architecture guidance, onboarding, code review, and technical leadership. I have helped teams improve delivery velocity and supported developers in progressing to senior-level roles.

I am particularly interested in distributed systems, open-source developer tooling, and agentic AI. I build local LLM workflows, Model Context Protocol servers, inference services, and secure tool-calling capabilities for autonomous coding agents.

Skills

38 capabilities

Tech stack & tools

Working toolkit

Experience

Career history

Senior Software Developer Level 2 / Tech Lead Campspot

I served as Tech Lead for the architecture and delivery of an abandoned-cart recovery platform. The platform orchestrated event-driven, cross-domain workflows across distributed services to automate customer re-engagement and recovered tens of thousands of dollars in cart value in its first month.

I engineered automated fraud-mitigation defenses that eliminated distributed carding attacks and protected payment gateways across tens of thousands of daily booking sessions. I also hired, onboarded, and mentored junior and mid-level developers through architecture guidance and code reviews.

I developed and maintained Campspot's customer-facing Flutter mobile application for iOS and Android, supporting campsite search, booking, and reservation management for tens of thousands of monthly active users.

Senior Software Developer Level 1 Campspot

I architected and launched an enterprise gift card platform adopted by hundreds of campground clients, creating a recurring revenue channel and expanding booking flexibility for consumers.

I hardened and optimized mission-critical checkout and payment-processing pipelines handling approximately $2M to $5M in daily transactions. I also engineered in-house point-of-sale and invoicing systems used in daily on-premise operations across partner parks.

I led UX and checkout improvements that reduced purchasing friction and contributed to increased Net Promoter Score and customer retention.

Software Developer Level 2 Campspot

I owned the implementation of enterprise discount and promotional-pricing engines operating across multi-tenant park environments.

I contributed to a multi-phase backend migration from a legacy Node.js and TypeScript stack to modern Java microservices, improving throughput and type safety.

I optimized search and reservation data workflows using Elasticsearch and PostgreSQL to support peak seasonal booking demand.

Software Engineer PRSM Healthcare

I engineered a fault-tolerant call-center infrastructure using redundant VPN connections and load balancing, ensuring 100% uptime for mission-critical operations.

I developed scalable web applications and data-processing pipelines that doubled client capacity while maintaining operational stability. I led the end-to-end rewrite of the core B2B application, migrating legacy PHP functionality to C# ASP.NET with improved security and modularity.

I migrated business applications from on-premises infrastructure to Microsoft Azure and later AWS, modernizing deployment pipelines. I also integrated customer outreach platforms with FreePBX VoIP infrastructure to automate calling workflows and improve connection rates.

Education

Learning history

Mansfield University of Pennsylvania

B.Sc., Computer Information Science: Information Systems

Graduated in 2014.

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