Open to new opportunities
Hi, I'm Mario Galeno
Software Engineer
Software engineer with 10+ years building production systems across full-stack web, mobile, backend, and cloud infrastructure. I've shipped healthcare applications used by patients, IoT systems at scale at Amazon Web Services, and mobile platforms for Fortune 500 companies.
What I bring to the table
- ✓Building IoT infrastructure at Amazon Web Services at scale.
- ✓Shipping healthcare mobile apps used by real patients.
- ✓Migrating Fortune 500 fintech apps from native iOS to React Native.
- ✓Leading engineering teams across complex, regulated domains.
- ✓Designing and owning systems end-to-end across the full stack.
Available for full-time roles, contract, and consulting.
10+
Years production experience
5
Companies & industries
Full-stack
Web · Mobile · Cloud
Remote
Based in Holland, MI
Technical Toolkit
Core skills & technologies
A decade of hands-on experience across the full software development stack.
⌨️
Languages
TypeScriptJavaScriptSwiftKotlinJavaObjective-CPHP
🖥️
Frontend
ReactNext.jsReact NativeHTMLCSS / SASSTailwind CSSAngular
⚙️
Backend & APIs
KotlinJavaNode.jsGraphQLNestJSExpressRESTSpring Boot
📱
Mobile
SwiftObjective-CReact NativeSwift / iOSApp Store deploymentNative modulesAndroid
Career
Full history →Recent experience
Senior Software Engineer
Hims & Hers
- Integrated deep-link CTA handling and GraphQL data into a post-purchase treatment tracking feature in React Native, surfacing order status for users.
- Delivered full-stack features independently — from React Native and Next.js on the client, GraphQL BFF and NestJS in the middleware layer, and Kotlin/Spring Boot backend services — decoupling frontend and backend dependencies on tight deadlines.
TypeScriptKotlinNext.jsReact NativeGraphQLNestJSSpring BootGitHub ActionsNx MonorepoGrowthBookAmplitudeJestStripeDatadog
Software Development Engineer
Amazon Web Services
- Eliminated manual infrastructure overhead by migrating internal frontend consoles from a legacy hosting tool — requiring management of routing, VPN configurations, and certificate renewals — to fully managed deployment environments.
- Upgraded IoT MQTT client from MQTT3 to MQTT5, improving connection reliability and expanding the control users have over connection behavior.
TypeScriptReactAWSCI/CDAndroid
Let's build something great together
I'm actively looking for my next opportunity. Whether it's a full-time role, contract, or consulting engagement — I'd love to hear about what you're building.