Nathan Sapwell

Senior Full-stack Architect

About

Senior full-stack architect and Director of DreamFast Solutions Limited, Hong Kong. With over a decade of experience and 100% job success rate on UpWork for over 8 years, my expertise spans robust web application development, Laravel API development specialist, comprehensive server management and security. I deliver scalable, high-performance solutions tailored to your specific needs.

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Latest Posts

Heretic Docker: Abliterating LLMs for Video and Image Generation

ai llm docker heretic gemma qwen comfyui video-generation

A while back I did a deep dive into abliterating Gemma 3 12B for use as an uncensored text encoder in LTX-2 video generation. The process worked but involved a lot of manual steps: running Heretic, merging safetensor shards, converting to ComfyUI format, quantizing to FP8, building GGUF quants. I got tired of doing it all by hand, so I built heretic-docker to automate the whole thing.

March 10, 2026

Abliterating Gemma 3 12B for LTX-2: Does It Actually Help?

ai llm video-generation comfyui heretic gemma ltx-2

LTX-2 is Lightricks’ open-source video generation model, and it uses Google’s Gemma 3 12B as its text encoder. Lets explore how to make an uncensored model and if it matters for LTX2 video generation.

January 11, 2026

Hack the Box - Cap

hackthebox 2025

Today we’re going to do ‘Cap’ which is another easy hackthebox challenge. This will be similar to our previous challenge where we will go through without reviewing how it was done, then compare afterward with the solution.

August 5, 2025

Previous Experience & Skills

Full Stack Web Development

Modern web application development using HTML5, CSS frameworks like Bootstrap and TailwindCSS, along with SCSS and LESS for styling.

JavaScript expertise includes jQuery, AJAX, and vanilla JS, with frontend frameworks such as Vue.js, React, Next.js, and Nuxt.js. Backend work spans PHP and Laravel for API development.

Database experience includes MySQL, MariaDB, PostgreSQL, and SQLite. Additional skills include responsive design, cross-browser compatibility, and Git version control.

Content Management Systems

Extensive experience with WordPress and Shopify, including custom theme design, modifications, and custom plugin development.

SEO optimisation implemented to ensure sites rank well in search engines.

AI / LLM

Training and fine-tuning language models with several open-source releases on HuggingFace. Model optimization and quantization for consumer hardware, dataset preparation and curation.

Development of agentic AI systems and integration with various LLM provider APIs, applying prompt engineering techniques for optimal results.

Server Administration

Server management across Debian, Ubuntu, CentOS/Almalinux, and BSD operating systems, including WHM/cPanel setup. Web server expertise covers Apache2, NGINX, and Caddy with load balancing and reverse proxy configurations.

Self-hosted email servers using Postfix, Dovecot, and SpamAssassin with ClamAV, implementing spam protection through DKIM, SPF, and OpenSRS.

Additional capabilities include shell scripting, firewall configurations with ipset and blacklists, VPN setup with OpenVPN and WireGuard, disaster recovery, backup strategies, and CDN/DNS services.

Basic Security Services

Penetration testing services including scanning local networks and software for vulnerabilities, along with remote vulnerability scanning.

Post-incident services include cleaning and restoring hacked or malware-infected websites, and securing servers after an attack.

Selected Work

For over a decade I've delivered a wide range of projects for clients across different industries.

SaaS Platform Development

Architected and built a multi-tenant SaaS application from the ground up using Laravel and Vue.js. Designed the API layer, tenant isolation, subscription billing integration and role-based access control. The platform scaled to serve thousands of active users across multiple organisations.

Legacy PHP to Laravel Migration

Took over a large legacy PHP codebase for an established business and incrementally migrated it to a modern Laravel architecture. This included restructuring the database layer, building a RESTful API, implementing automated testing and deploying with zero downtime to ensure business continuity throughout the transition.

E-Commerce API & Payment Integration

Developed a custom Laravel API backend for an e-commerce platform, integrating with third-party payment gateways, inventory management systems and shipping providers. Focused on security hardening, PCI compliance considerations and performance optimisation under high traffic loads.

Server Infrastructure & Security Hardening

Designed and managed production server environments for multiple clients, including load-balanced configurations, automated deployment pipelines, firewall management, email server setup with full DKIM/SPF/DMARC compliance and ongoing monitoring. Provided security audits and vulnerability assessments across all environments.

Custom Business Applications

Built internal tools and workflow automation systems for small and medium businesses. Everything from CRM-style platforms to booking systems to data dashboards. These projects typically involve close collaboration with non-technical stakeholders to translate business requirements into clean, maintainable software.

Shopify Store Development

Built and customised Shopify stores for clients across retail, services and hospitality. This includes custom theme development, app integrations, payment and shipping configuration, SEO and performance tuning. Most of these projects involved taking an existing store that wasn't working well and rebuilding it into something the client could actually manage themselves.

CI/CD & Deployment Automation

Set up automated build and deployment pipelines using GitHub Actions, GitLab CI and shell scripting. Configured staging and production environments with automated testing, zero-downtime deployments and rollback strategies. Just reliable pipelines that don't need babysitting.

AI Integration in Production Applications

Integrated LLM-based features into existing Laravel applications for clients, including AI-assisted content generation, intelligent search and automated data processing. Built RAG pipelines for domain-specific knowledge retrieval, fine-tuned open-source models for client use cases and set up local inference servers for clients who needed to keep their data on-premise. Also release my own open-source models on HuggingFace.

Github Projects

heretic-docker

Docker container for running heretic LLM abliteration on NVIDIA Blackwell GPUs

1 0 Python

srn-selective-routing-network

A novel neural architecture replacing Transformer self-attention with sparse routing to learned memory slots. Introduces Windowed Causal Score Gating (WCSG) for causal, position-dependent routing with O(1) memory overhead. Designed to run on consumer GPUs (6GB VRAM)

1 0 Python