Precision Engineering Services

What I Build

From modern React frontends to hardened API microservices and LLM pipelines.

Full-Stack Development

Bespoke websites and web applications using modern stacks like Next.js, React, and Node.js with pixel-perfect responsive layouts.

Deliverables:
  • Modern React & Next.js UI
  • Robust REST/GraphQL APIs
  • Database Modeling & ORM

SaaS & Platform Development

Building MVPs, subscription systems, and data dashboards with scalable multi-tenant architecture and rock-solid auth.

Deliverables:
  • Multi-tenant Data Partitioning
  • Stripe Subscriptions & Invoicing
  • Role-based Access Control

AI-Powered Solutions

Integrating custom chatbots, assistants, and automation tools using Gemini, OpenAI, Claude, and local LLM pipelines.

Deliverables:
  • RAG Knowledge Retrieval
  • Automated Content & SEO Pipelines
  • Custom Autonomous Agent Workflows

E-Commerce Development

Custom WooCommerce & Shopify builds, high-conversion checkout flows, and payment gateway (Stripe, PayPal) integrations.

Deliverables:
  • Headless & Custom Checkout
  • Live Inventory & Ticket Booking
  • Custom Extension & Plugin Builds

Mobile & Cross-Platform

Creating Progressive Web Apps (PWAs) and React Native mobile apps backed by cloud servers and offline-first storage.

Deliverables:
  • Offline Support & Service Workers
  • Push Notifications
  • Native Device API Access

System Architecture

Expert technical consulting on scalability, database design, microservices, cloud infra, and CTO-for-hire advisory.

Deliverables:
  • Scalability Roadmaps
  • Database Schema Optimization
  • Security Audits & HIPAA Alignment

Plugins & Integrations

Developing custom WordPress plugins, API connectors (Google Ads, GA4, GSC, Royal Mail), and seamless REST integrations.

Deliverables:
  • Bespoke WordPress Plugins
  • Webhook Orchestration
  • Third-party CRM Sync

Support & Growth

Providing ongoing maintenance, feature extensions, performance optimization, and proactive security hardening.

Deliverables:
  • 99.9% Uptime Monitoring
  • Zero-downtime Patching
  • Core Web Vitals Optimization

AI-Powered SEO

Leveraging AI to enhance search rankings, optimize content structure, and perform intelligent semantic keyword analysis.

Deliverables:
  • Automated SERP Scraping & Analysis
  • Semantic Keyword Clustering
  • Automated Meta & Schema Generation

Website, Software & App Security

Investigating malware and suspicious activity, reviewing vulnerabilities and strengthening websites, custom software, APIs and mobile applications.

Deliverables:
  • Malware investigation and cleanup support
  • Website, API and application security reviews
  • Vulnerability remediation and hardening
Core Architecture Pillars

Specialized Capabilities

High-leverage engineering across four deep technical disciplines. Built for real enterprise loads.

Intelligence Layer

Neural Architectures & Autonomous Pipelines

Architecting generative AI systems that go beyond basic prompt wrappers. I build custom RAG pipelines, fine-tuned agent workflows, and vector-backed knowledge retrieval systems for enterprise applications.

NEURAL_SEARCH

Vector data retrieval & hybrid semantic search using Gemini & embeddings

LLM_PIPELINES

Streaming structured outputs with Gemini 2.0, OpenAI, and Claude

AUTONOMOUS_AGENTS

Multi-step tool calling, self-evaluating chains, and agentic workflows

KNOWLEDGE_GRAPHS

Connected enterprise context ingestion and real-time synchronization

LIVE_ARCHITECTURE_TELEMETRY
ACTIVE
Input IngestionHigh Throughput
AI Solutions Engine0.4ms Latency
Production ResultDeterministic

"Moving beyond passive chat to proactive, autonomous decision engines."

Contact / Project Enquiry

Have an idea, existing site or growth challenge? Tell me what you want to build, improve or grow.

Based in Manchester

Working with people building digital products and businesses.

Based inManchester, UK
Emailchristopher@christopherjcallaghan.com
Find me online
Start with the idea

A short note is enough. You do not need to know the technology before getting in touch.