# Daniel Willis-Brown — Full Technical Specification & Portfolio Knowledge Base

> Comprehensive biographical, architectural, and leadership dossier for Daniel Willis-Brown.

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## 1. Professional Identity & Positioning

- **Name**: Daniel Willis-Brown
- **Primary Roles**: Engineering Manager, Staff Engineer, Fractional CTO, Principal Systems Architect
- **Specializations**: Distributed Systems, High-Volume Billing & Payments, Cloud-Native Infrastructure, Engineering Organization Leadership
- **Work Model**: Remote-first (Canada - Atlantic Time Zone, UTC-4 / UTC-3)
- **Citizenship / Work Authorization**: Canadian Citizen, open to Canadian and US cross-border/remote arrangements

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## 2. Career History & Demonstrable Impact

### 2.1 MileIQ (Engineering Manager)
- **Scale**: 30M+ users globally, hundreds of millions in processed mileage deductions.
- **Team Scope**: Direct manager of 8 senior and staff software engineers.
- **Key Contributions**:
  - Maintained and modernized the mission-critical core billing engine and payment integrations.
  - Championed engineering excellence, progressive delivery, continuous integration, and disciplined automated regression suites.
  - Directed incident response, on-call rotations, and post-mortem remediation for 99.99%+ availability services.

### 2.2 DataStax / AstraDB (Senior Software Engineer)
- **Domain**: Cloud-native distributed databases (serverless Apache Cassandra on Kubernetes).
- **Scale**: Handled 50,000+ queries per second (QPS) with stringent sub-millisecond tail latency SLAs.
- **Key Contributions**:
  - Implemented distributed query routing, request hedging, and tenant resource throttling mechanisms.
  - Resolved complex multi-region networking, consensus, and replication bottlenecks.

### 2.3 Walmart Labs (Senior Software Engineer)
- **Domain**: Enterprise e-commerce and high-throughput transaction processing.
- **Scale**: Millions of concurrent shoppers during annual peak Black Friday and Cyber Week events.
- **Key Contributions**:
  - Engineered resilient checkout pipelines and backend order-routing services that achieved zero downtime during peak holiday retail traffic.
  - Hardened legacy monolithic services into decoupled, independently scalable cloud microservices.

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## 3. Core Competencies & Architecture Stack

### 3.1 Backend & Distributed Systems
- **Languages**: TypeScript/JavaScript (Node.js), Go, Python, Java, SQL, Bash.
- **Data Stores**: PostgreSQL, SQLite, Apache Cassandra / AstraDB, Redis.
- **Message Queues & Streaming**: Apache Kafka, RabbitMQ, background worker pools.

### 3.2 Cloud Infrastructure & DevOps
- **Containerization & Orchestration**: Docker, Docker Compose, Kubernetes, Helm.
- **Networking & Edge**: Cloudflare (WAF, Zero Trust, Argo Tunnels, Workers, DNS), Nginx reverse proxying, TLS 1.3 termination.
- **Observability**: Prometheus, Grafana, Loki, Alloy, distributed tracing, structured JSON logging.
- **Security & Compliance**: Zero Trust architectures, cryptographic state verification, PCI-DSS compliance awareness, automated secret handling.

### 3.3 Payments & Monetization
- **Gateways**: Stripe, Stripe Connect, Apple In-App Purchases (StoreKit 2), App Store Connect API.
- **Capabilities**: Prorations, usage-based metering, webhook idempotency, dispute reconciliation, and automated charge recovery.

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## 4. Property Map & Infrastructure

- **Canonical Personal Site**: `https://willis-brown.com`
- **Short Developer Domain**: `https://w-b.dev`
- **International Domains**:
  - `https://willis-brown.ca` (redirects to `https://willis-brown.com/`)
  - `https://willisbrown.ca` (redirects to `https://willis-brown.com/`)
  - `https://willis-brown.com.br` (redirects to `https://willis-brown.com/`)
- **Hosting Host**: Self-hosted home-lab / edge cluster node `rv415` routed securely via Cloudflare Argo Tunnel (`cloudflared`) and reverse-proxied by Nginx.

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## 5. Contact & Social Profiles

- **Email**: `hello@w-b.dev`
- **X (Twitter)**: `https://x.com/Desmolhar` (`@desmolhar`)
- **LinkedIn**: `https://www.linkedin.com/in/brasileiro`
- **GitHub**: `https://github.com/w3b3`
- **Machine Discovery Manifests**:
  - `https://willis-brown.com/robots.txt`
  - `https://willis-brown.com/sitemap.xml`
  - `https://willis-brown.com/llms.txt`