Senior Software Engineer
Ruby on Rails Developer & Healthcare AI Engineer
15+ years building SaaS platforms, LLM integrations, and voice AI systems. Available as a fractional software engineer or Rails consultant for your next project.
Companies I've worked with
Recommendations
"I have worked with Newton at three different companies. He's been an important member of our software engineering team. While he started just helping us with a complex Ruby on Rails application, Newton has branched out to help with many other projects, like solving problems with a complicated AWS-based backup system and using R to process analytics data. He has done many deep dives into our systems and emerged with bug fixes, documentation improvements, and custom utilities to help others better manage those systems. He got along great with our team; he's friendly, eager to learn, and willing to help anyone. It has been great being on a team with Newton. He has a lot to offer and I'm sure he'd fit in well anywhere."
What I Do
Services
Backend Engineering
Scalable Ruby on Rails API development, microservices architecture, and robust backend systems. Available as a freelance Rails developer or fractional software engineer for contract engagements.
AI & Voice Systems
LLM integration services, voice AI integration, and conversational pipelines — from speech-to-text to text-to-speech. Specializing as a healthcare AI developer for enterprise and clinical applications.
SaaS Development
End-to-end SaaS development services — from database design and billing to real-time features. Hire a Rails SaaS developer for production-grade product builds.
Pricing
Service Plans
Access senior-level engineering on demand. Scale your development without the overhead of a full-time hire. Pause or cancel anytime.
Standard
Perfect for getting started with dedicated engineering support.
- One request at a time
- Average 48-hour delivery
- Unlimited revisions
- Ruby on Rails & backend
- Frontend & API development
- Async communication
- Pause or cancel anytime
Pro
For teams that need dedicated senior engineering on an ongoing basis.
- Two requests at a time
- Average 48-hour delivery
- Unlimited revisions
- Full-stack development
- AI & voice integrations
- Architecture & code reviews
- Direct Slack/video access
- Pause or cancel anytime
Custom
Tailored solutions for enterprise needs. Let's discuss your requirements.
- Custom request volume
- Priority delivery
- Unlimited revisions
- Team embedding option
- Dedicated Slack channel
- Weekly strategy calls
- Custom contract terms
- Full-stack + AI/ML scope
Not sure which plan fits? Book a 15-minute discovery call to discuss your needs.
Career
Work
Organizations I've partnered with as a software engineer, contributing to real products, production systems, and long-term technical foundations.
Action Network
CurrentCore Ruby on Rails developer and backend engineer on Action Builder, a new organizing CRM product. Designed and implemented GraphQL schema powering relationship mapping, network visualization, and organizer workflows as a contract software engineer.
Wendi
Led development of a healthcare AI voice assistant platform as a contract software engineer. Built automated patient intake, insurance verification, and multichannel conversations using LLM integration services. Architected end-to-end patient workflow engine and real-time conversational AI pipelines.
HuntClub
Developed and shipped features for a talent-matching platform used by thousands of recruiters and hiring managers. Built full-stack features improving recruiter workflows and candidate pipeline management.
The Neat Company
Built and maintained backend microservices for Neat's core platform, led a 3-month Rails upgrade across multiple major versions on a legacy application, and coordinated development with other engineers to modernize and support the company's backend services.
CrazyEgg
Re-architected signup flow and ran 12 A/B tests, lifting conversion rates. Integrated Elasticsearch into analytics dashboard, cutting load time from 4s to 800ms. Built Shopify Kit Skills integration increasing retention rates.
Envato
Built and improved a managed WordPress hosting platform with multi-service architecture. Designed and implemented automated WordPress backup system for thousands of hosted sites.
Pressed
Founding engineer on a greenfield WordPress hosting platform. Built the entire stack from scratch using Ruby on Rails on AWS, including site provisioning, DNS configuration, and SSL management.
ReferralCandy
Shipped product features and streamlined e-commerce platform integrations for a referral marketing SaaS serving thousands of merchants.
Site5
Built internal CRM and client-facing management tools, a white-label managed WordPress product, and custom automation tooling for staff operations.
WWWH
Built internal CRM and client-facing management tools, a white-label managed WordPress product, and custom automation tooling for staff operations.
Critsend
Built a next-generation email deliverability platform in Python and maintained a distributed transactional email service handling high-volume sends. Developed a server reputation monitoring module (blacklist tracker) and a billing application for the new product line.
Side Projects
Projects
Bootstrapped side projects built end-to-end — from concept to production — driven by real problems and long-term curiosity.
AgentsHQ
personal ActiveThe control plane for autonomous AI agents — deploy a fleet, put them on a live board, and keep them on a budget.
Chatified
personal ActiveAI Voice & Messaging Platform with multi-channel support and LLM integration for Businesses.
MailMachine
personal ActiveAI-Powered Email Triage & Automation. Email marketing platform with automation, analytics, and deliverability tools.
Maior Desconto
personal ClosedGroup-buying marketplace in Brazil with $700K+ sales, 41K+ users, and 17K paying customers. Built with Ruby on Rails.
Mailtrack
personal ClosedEmail marketing platform with campaign automation and analytics.
Kivu
personal ClosedSimple e-commerce platform for small businesses and individuals.
Impact
Results That Matter
41K+
Registered users on marketplace
Maior Desconto
$700K+
Revenue from bootstrapped marketplace
Maior Desconto
AI
Real-time conversational voice pipelines
Wendi
30K
Monthly payouts processed
State Gov
100K+
Students monitored in engagement system
State Gov
5%
Increase retention via Shopify integration
CrazyEgg
15+
Years of Experience
Building production systems
10+
Companies
From startups to enterprises
100K+
Users Served
Across platforms built
45
Countries Visited
Global perspective
About
Newton Garcia
Ruby on Rails developer and contract software engineer with 15+ years of experience. Most recently worked as a healthcare AI developer, leading the development of a voice AI integration platform for patient intake and clinical workflows. Built the platform from scratch, including LLM integration services, backend systems, and connections to EHR-related tools.
Available as a freelance Rails developer or fractional software engineer. Background across SaaS development, e-commerce, and cloud platforms, with a strong focus on Ruby on Rails consulting, API development, and production reliability.
Founded two companies — including a Rails SaaS marketplace that generated over $700K in sales — and contributed to open-source projects like graphql-ruby.
Location
Goiania, Brazil
Languages
Portuguese, English, Spanish
Traveled
45 countries →Status
Available
Stack
Technical Skills
Languages
01Backend & APIs
02Frontend
03Data & Search
04Infrastructure
05Observability
06AI & Voice
07Contact
Let's build
something great.
I'm always open to discussing interesting projects and future partnerships