Thomas (Tommy) Trzebiatowski
Senior Software Engineer
I build accessible, scalable web applications with modern technologies. Currently leading GraphQL services at Marriott International, with 10+ years of experience crafting digital experiences that users love.
Experience
A decade of building scalable software solutions across diverse industries
Marriott International
- Designed subgraph contracts and supported channels in integrating them.
- Lead development on scalable GraphQL operations supporting reservation and loyalty systems (SPOG, ARA, and QRV).
Swoop Connect
- Built React Native (Expo) features with Apollo GraphQL.
- Operated as sole engineer in a fast-paced startup; shipped to iOS and Google Play.
- Implemented CI/CD (Bitbucket, EAS), automated GraphQL operations.
American Poolplayers Association
- Engineered a scalable GraphQL API for 250k+ users across multiple apps.
- Built a React Native app supporting tens of thousands of concurrent users.
- Developed a React app for the player base and 300+ franchise owners.
MCIS (Marshfield Clinic Information Services)
- Developed Electronic Health Record (EHR) product using WPF.
- Built internal tools to streamline repetitive testing for EHR.
Skyward
- Built finance software for the new Skyward suite using C# .NET and T-SQL.
- Delivered software on a two-week agile sprint cadence.
Reinhart Foodservice
- Engineered internal systems using JavaScript, jQuery, HTML, and CSS.
Projects
Side projects and personal ventures that showcase my passion for building useful software
- Health & wellness platform for organizations to run walking/running challenges.
- T3 stack (Next.js, tRPC, Drizzle ORM, NextAuth) on Neon PostgreSQL.
- Event creation, participant tracking, leaderboards, community health features.
- Web app listing locations for free games (pool, darts, etc.); user-contributed data.
- Built with Next.js and Firebase (evolved tech over project lifetime).
- Profiles for personal sizes (ring, shoe, etc.) with social-style sharing.
- React + Firebase auth and data storage.
Skills & Technologies
Technologies I work with daily and areas I'm passionate about exploring
Community Involvement
Using technology to support local organizations and community initiatives
- Built the original website (Gatsby on Netlify).
- Provide ongoing technical support as the event has grown >50% YoY.
- Maintained and improved their WordPress website.
- Built a real-time mile tracker (React + Firebase) for the annual run-club competition.
- Thousands of miles recorded through the tool.
Let's Connect
Always interested in discussing new opportunities, interesting projects, or just having a chat about technology