Full-stack contractor · St. Pete, FL · Available now

Senior engineer for SaaS teams that need it done right

I've shipped payments systems, compliance automation, and growth experiments at MasterClass, Secureframe, and Emeritus. 7+ years building and scaling production systems at high-growth SaaS companies.

Work with me See my work ↓
6%
conversion lift via PayPal/Braintree experiments at MasterClass
23×
faster page load on SEO pages — 5.3s down to 233ms
17%
conversion lift from category carousel feature

Selected work

Signalfire 2026–present
Co-founder & Engineer
Turns physical public spaces into discovery points for community groups. A QR-coded totem marks where a group meets — scanning it opens a location-specific bulletin board with events, recurring meetups, and links to join. Full-stack web app with native iOS and Android clients (not yet publicly available), piloting in St. Petersburg, FL.
signalfire.live ↗
RailsReactiOSAndroidFull-stack
MasterClass 2016–2020
Software Engineer → Senior Software Engineer I
Led backend engineering for pricing and referral experiments — among the most critical business work that year. Built PayPal/Braintree subscription integrations (+6% conversion). Reduced SEO page load time from 5.3s → 233ms, cutting bounce rate significantly.
RailsPostgreSQLGraphQLReactA/B testing
Emeritus 2020–2022
Senior Software Engineer
Rearchitected the entire payments system to reduce Salesforce dependency and enable new functionality. Designed multi-currency support and a Multi-Armed Bandit testing framework from scratch.
RailsPaymentsMAB testingMulti-currency
Secureframe 2022–2023
Senior Software Engineer
Built and maintained compliance automation integrations (Google, AWS, Microsoft). Created a production data replication and anonymization tool to improve debugging and environment consistency while protecting PII.
RailsCompliance automationAWSData tooling

Services

Full-stack web development
End-to-end Rails APIs and React frontends. New products, new features, or rescuing existing codebases.
Mobile apps
React Native for iOS and Android. Shared codebase, native feel, shipped to both stores.
Payments & billing systems
Stripe, Braintree, multi-currency. I've rearchitected payment systems at scale.
API & backend development
Greenfield Rails APIs, third-party integrations, and backend features. Clean, tested, documented.
₿
Fintech & crypto background
Founded Bitcopia in 2012 — one of the first bitcoin brokerages — handling hundreds of orders per day with zero loss of funds. I understand the security, compliance, and reliability requirements of financial systems firsthand. Useful for crypto exchanges, payment processors, and fintech startups.

Let's build something together

Drop me a line with what you're working on.
I'll get back to you within one business day.

Or email me directly at hello@fuzzworley.dev