my image
🫡
Hello, I'm William

I am a full-stack software engineer.

I build scalable web applications with passion and precision.

Specializing in your everchanging Solutions

Passionate about solving complex problems through elegant code and innovative technology.

Contact me here
Download CVView Resume

I'm a full-stack software engineer currently working as a DoD contractor supporting Defense Health Agency platforms including health.mil and TRICARE. I'm helping ship the first government blockchain deployment in production using Hyperledger Iroha, and building internal tooling that's been adopted across multiple DoD teams.

Outside of my contract work, I'm building GymTech—a SaaS platform for martial arts and fitness gyms. From multi-tenant architecture to Stripe Connect integrations, I enjoy solving real business problems with clean, scalable code. I'm CompTIA Security+ certified and take security seriously in everything I build.

My background spans Web3, AI integrations, and enterprise systems. I've led teams, shipped production apps, and worked with technologies ranging from React and TypeScript to Rust and Solidity. When I'm not coding, I'm usually with my family—they keep me grounded and motivated.

Defense Health Agency — DoD Contractor

Software Engineer supporting health.mil and TRICARE platforms through government contracts (Semper Valens Solutions → Chenega Corporation). Shipping DoD Health IT features on Hyperledger Iroha—the first government blockchain deployment in production. Built a NestJS SDK adopted by 4 DoD teams, reducing boilerplate setup from 2 days to 3 hours. Maintaining enterprise CMS sites with JavaScript, C#, and Sitecore while implementing security protocols including end-to-end TLS, VPN tunnels, and WAF configurations.

  • NestJS
  • Hyperledger Iroha
  • C#
  • JavaScript
  • Sitecore CMS
  • TypeScript
  • Security+
  • .NET
  • Node.js
  • DoD

GymTech — Gym Management SaaS

Full-stack SaaS platform for martial arts and fitness gyms competing with SparkMembership. Built multi-tenant architecture with role-based access control (super_admin, gym_owner, staff, member) and tier-based subscriptions ($79-$299/mo). Integrated Stripe for platform billing and Stripe Connect for gym payment processing. Core features include class scheduling, member database, QR check-in system, landing page builder, and real-time analytics dashboards. PostgreSQL triggers enforce tier limits on members, staff, and messaging quotas. Designed complete subscription lifecycle with 14-day trials and automated data policies.

  • Next.js
  • TypeScript
  • Supabase
  • PostgreSQL
  • Stripe
  • Tailwind CSS
  • Zustand
  • RLS
  • Multi-tenant
  • SaaS

Learning Tutor

An AI-powered personalized learning platform that curates adaptive learning plans for any subject. Built to help me achieve my CompTIA Security+ certification, this full-stack application leverages LLM technology to create customized educational pathways and intelligent tutoring capabilities.

View Live Demo→
  • React
  • Next.js
  • Tailwind
  • AI
  • LLM
  • TypeScript
  • Node.js
  • API
  • Full-Stack

Anything_AI

Facilitating MCP tools with agentic AI integration for any website and tech stack. Enables seamless AI-Bot communication and web scraping capabilities that adapt to client-specific APIs and requirements. Flexible architecture supports multiple programming languages and frameworks.

  • C#
  • .net
  • Python
  • JavaScript
  • AI
  • LLM
  • RAG
  • Opensource
  • JAVA
  • API
  • Fine-Tune

Appliance Consult

Full-stack application digitizing a century of appliance repair expertise into an AI-powered advisory platform. Users receive instant expert repair guidance with one click. Built with modern tech stack integrating payment processing and comprehensive database architecture to deliver intelligent repair recommendations.

  • React
  • Next.js
  • Tailwind
  • Rust
  • MongoDB
  • API
  • LLM
  • AI
  • Prisma
  • Stripe
  • ORM
  • Node.js
  • Drizzle

EAS

Brought on as lead developer for Experience as a Service platform through referrals from previous successful projects. Architected scalable full-stack solution with payment integration, authentication systems, and blockchain capabilities to serve B2B clients.

  • React
  • Next.js
  • MongoDB
  • Tailwind
  • Node.js
  • Rust
  • Stripe
  • Blockchain

Command Center

Led development team building a comprehensive Web3 wallet tracker with multi-chain indexing capabilities. Real-time data dashboard displays wallet holdings across multiple blockchain networks with integrated DeFi options for cross-chain operations.

  • React
  • TypeScript
  • Next.js
  • Tailwind
  • Solidity
  • Postgres
  • AI-LLM
  • Node.js

CoinCrete

Joined a growing development team building a Web3 dApp from the ground up with security as the primary focus. Implemented core features including smart contract integration, user authentication, and multi-chain wallet connectivity using modern full-stack technologies.

  • React
  • TypeScript
  • Next.js
  • Tailwind
  • Solidity
  • JavaScript
  • MongoDB
  • Postgres

CFT

Innovative decentralized market pools platform built with trust and transparency at its core. Features comprehensive transaction indexing on local RPC nodes, enabling users to track and verify all market activities in real-time.

  • React
  • Next.js
  • Solidity
  • Rust
  • Framer
  • SQL
  • RPC
  • Node.js

Founder & Lead Developer — GymTech

Remote

Building a full-stack SaaS platform for martial arts and fitness gyms. Architected multi-tenant system with role-based access control, tier-based subscriptions ($79-$299/mo), and Stripe Connect payment processing. Implementing class scheduling, member management, QR check-ins, landing page builder, and real-time analytics with PostgreSQL and Supabase.

Dec 2025 - Present

Software Engineer — DoD Contractor

Seattle, WA (Hybrid)

Supporting Defense Health Agency platforms (health.mil, TRICARE) through government contracts with Semper Valens Solutions and Chenega Corporation. Shipping DoD Health IT features on Hyperledger Iroha—pushing for the first government project supported on blockchain in production. Built NestJS SDK adopted by 4 DoD teams. Maintaining enterprise CMS with JavaScript, C#, and Sitecore while implementing end-to-end TLS, VPN tunnels, and WAF configurations.

April 2025 - January 2026

Lead Full-Stack Developer

Remote

Leading development of enterprise SaaS platforms with focus on payment processing, authentication systems, and data analytics. Architecting secure APIs and implementing industry-standard security practices for client applications. Managing full development lifecycle from requirements to deployment.

Oct 2022 - Present

Full-Stack Lead Developer

Seattle, WA

Lead developer for Experience as a Service (EAS) platform. Architected scalable full-stack solutions serving B2B clients. Built core features including user authentication, payment integration, and real-time data processing using modern web technologies.

2020 - 2022

Blockchain Developer & Team Lead

Remote

Led blockchain development team building decentralized applications (dApps) for Web3 projects. Designed and implemented smart contracts and frontend interfaces that interact with multiple blockchain networks. Collaborated with leading Web3 companies on production deployments.

2021 - 2024

Freelance Full-Stack Developer

Remote

Provided full-stack development services with emphasis on security and scalable architecture. Built custom web applications for clients in various industries. Specialized in React, Node.js, and blockchain integrations while maintaining strong focus on code quality and security best practices.

2020 - 2021

CompTIA Security+ Certified

CompTIA

Issued: October 28, 2025 | Expires: October 28, 2028

Credential ID: COMP001022876354

Verify Credential→

Please contact me directly at tundra2727@gmail.com or by filling out this form.