JDeen

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Ruby on Rails

Ruby on Rails Development

Rails applications, APIs, MCP servers and AI automation, from an engineer who has built two payment gateways on Rails.

Discuss Your Project arrow_forward View Work History
A curved monitor on a walnut desk showing a Rails model in a dark code editor above a passing test run, beside a crimson gemstone and a notebook of diagrams
A laptop showing API documentation with a list of order, payment and customer endpoints and a JSON response marked 200 OK
A laptop showing an AI assistant calling order, invoice and refund tools beside an order automation workflow
In payment gateways
10 years
Gifts a year at GivingFire
$100M+
Gateways built
2
Shipped at Edge
3DS + 3RI

Rails, Built Like Payment Infrastructure

I built GivingFire's payment gateway and donation platform on Rails as its sole engineer, and later the Rails payment gateway at Edge Payments Technologies. Both move real money every day, so correctness, audit trails and uptime were never optional.

I bring the same discipline to your application, whether it is a new product, an API for your partners, an upgrade of an ageing codebase, or putting AI to work on the data you already have.

Ruby on Rails APIs MCP AI Automation
code

Rails Applications

New products and internal tools with tested domain models, background jobs and admin interfaces your team can maintain.

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APIs and Integrations

REST and JSON:API endpoints, webhooks and OAuth, plus integrations with CRMs, accounting systems and payment processors.

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MCP Servers

Model Context Protocol servers that let Claude, ChatGPT and other assistants read and act on your Rails data through scoped, authenticated tools.

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AI Integration and Automation

LLM features inside your app, and automated workflows for review, triage and reporting, with people kept in the loop where it matters.

Track Record

10 Years Inside Payment Gateways

Since 2017 my work has been payment infrastructure: first as the sole engineer on GivingFire's gateway, then building and leading engineering at Edge Payments Technologies. Systems that move money leave no room for shortcuts, and I bring that standard to every project.

payments

Edge Payments Technologies

Lead Software Engineer and Head of Compliance · 2022 – present

  • check_circle Built the company's Ruby on Rails payment gateway.
  • check_circle Integrated the RS2, NMI and Moov processors for card and ACH payments.
  • check_circle Implemented KYC and KYB onboarding, and machine-learning risk scoring and fraud detection.
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GivingFire

Senior Software Engineer · 2017 – 2022

  • check_circle Sole engineer on the Rails payment gateway and donation platform used by about 250 churches and non-profits.
  • check_circle Scaled it to process $100M+ in gifts a year across card, ACH and cash.
  • check_circle Built a custom subscription billing engine, and integrations with Salesforce, Planning Center, Breeze and Zapier.
See the full work history arrow_forward
The Delivery Path

How We Get There

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Discovery

Your business, constraints and what success looks like.

architecture

Design

Architecture, data models and a plan you can review.

code

Development

Iterative builds with regular demos and feedback.

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Deployment

Production launch, monitoring and knowledge transfer.

Transparent Pricing

Scope-Based Engagement

  • check_circle Discovery & Requirements Session
  • check_circle Technical Architecture Document
  • check_circle Source Code & Documentation Handover

Project Pricing

Custom Quote

Scope-based pricing tailored to your project complexity and timeline.

Hourly Rates

Short-term contracts

$50/hr

Advisory, code review, fixes, and short projects.

Long-term, full-time

$30/hr

Ongoing full-time contracts, working as part of your team.

Common Questions

Can you take over an existing Rails application? expand_more

Yes. I start with a review of the code and infrastructure, then agree a plan with you: the risky parts first, tests around whatever is about to change, and Rails and Ruby upgrades in small steps.

What is an MCP server, and why would my Rails app need one? expand_more

The Model Context Protocol is an open standard that lets AI assistants call tools in your software. An MCP server in your Rails app gives assistants such as Claude a defined set of actions, like looking up an order or drafting an invoice, behind the same authentication and permissions as the rest of the app.

Do you work with existing teams? expand_more

Yes. I can lead a project end to end, or join your team for a defined piece of work, code reviews or architecture advice, billed hourly.

Interested in Ruby on Rails Development?

Tell me about your application, your API or the workflow you want to automate, and I'll get back to you with next steps.

View Work History