What I'm building
FieldLedgr
Mobile-first quote-to-cash platform for trades businesses. Estimates, e-signatures, invoicing, payments, and automated follow-ups, all in one place.
Trades workers juggle paper quotes, separate invoicing apps, and manual payment chasing. Most existing tools are desktop-first and overly complex.
Built a mobile-first flow from quote to payment using Payload CMS for the backend, Stripe Connect for payments, and Cloudflare Workers for edge performance.
Dungeon Diary
An AI-powered campaign management platform for Dungeon Masters. Built for the full lifecycle of a D&D campaign -- from world building and NPC generation to session tracking and encounter management.
DMs spend hours prepping campaigns across scattered notes, spreadsheets, and documents. Between sessions, story details get lost and prep time eats into the fun.
Purpose-built campaign hub with AI generation for NPCs, locations, quests, encounters, loot, and regions. Includes interactive character sheets, integrated dice rolling, combat tracking, a world building wiki, and AI portrait generation -- all organized around your active campaign.
Game Night
A two-sided marketplace for tabletop gaming events. Venues get a full event management platform with ticketing, ticket scanning, and payment processing. Players use a Google Maps-based discovery tool to find local game nights filtered by event type, venue type, price, and distance.
Game shops and venues manage events across Facebook, Eventbrite, and spreadsheets. Players have no dedicated way to find local tabletop gaming events near them.
Built a venue partner dashboard with full ticketing and payment infrastructure, a Google Maps event discovery layer with category and distance filters, and a claimable venue page system for bootstrapping the marketplace.
Finch
A TypeScript multi-agent AI assistant built for established business owners. Finch runs a specialized team of agents handling research, outreach, content, and analysis -- all coordinated through a soul system that shifts behavior based on what you need.
Solo founders and small business owners are great at building but struggle with the growth, research, and operational work that doesn't come naturally to them.
Architected a multi-layer cognitive memory system covering episodic, semantic, and procedural memory, with emotional context tagging and background consolidation. Agent team routed through OpenRouter with no local GPU dependency. Soul library built as swappable MD files compatible with OpenClaw.
Where I've been
15 years architecting high-performance, user-centric frontend applications. Specialized in React, TypeScript, and scalable UI systems with a strong emphasis on accessible design and engineering standards.
Senior Software Engineer
Synchrony
- Delivering full-stack feature development for enterprise financial services platform
- Contributing to scalable React and TypeScript codebase serving large-scale consumer-facing applications
- Collaborating with cross-functional product and engineering teams to define and implement technical solutions
Senior Software Engineer
GymOwners.com
Company-wide restructuring ended full-time role.
- Increased test coverage from 35% to 85% and improved overall app performance by 20%
- Built CRM and business management tools used daily by gym owners nationwide
- Introduced frontend unit testing application-wide using Vitest and React Testing Library
- Established documentation standards and code quality guidelines for the engineering team
Head of Engineering
Journey
Fixed-term contract.
- Architected and developed consumer and content creation partner platforms end-to-end
- Launched user signups 30 days ahead of schedule, accelerating early adoption and growth
- Reduced operational maintenance through scalable Next.js architecture with automated CI/CD
- Integrated headless CMS for dynamic content management, optimizing UI/UX workflows
Senior Software Engineer
General Motors
- Built real-time motorsports analytics tools for NASCAR, IMSA, and WEC racing teams
- Enhanced image analysis accuracy using React, WebSockets, Canvas, and FabricJS
- Reduced codebase size 40% through component refactoring, improving modularity
- Developed live GPS race mapping tools for real-time visualization and pit strategy analytics
Senior Front-End Engineer
Banjo Health
Company-wide restructuring ended front-end roles.
- Reduced manual workflows 50% with AI-powered decision tree interface
- Migrated legacy jQuery and KendoUI monolith to modern React SPA architecture
- Implemented HITRUST-compliant security practices for healthcare data handling
Senior Front-End Engineer
Earnest
- Designed and launched a fully WCAG 3.0-compliant design system improving accessibility across all UIs
- Increased frontend performance 17–32% through fetch optimizations and lazy loading
- Built Storybook component library standardizing UI across multiple applications
- Introduced TypeScript to improve code consistency and developer experience
Senior Web Developer
Barrett Values Centre
- Reduced page load times 65%+ by migrating from Java-based UI to React and TypeScript
- Optimized API performance by transitioning from REST to GraphQL, reducing network overhead
- Built scalable component library ensuring consistent UI across enterprise applications
Senior Front-End Engineer
Red Ventures
- Built React-based real-time chat UI used by millions of monthly users
- Managed and mentored a team of 2–5 engineers across multiple business units
- Created reusable component library reducing redundant code across teams
Like what you see?
I'm open to full-time roles, contract work, and interesting collaborations.
Let's talkSolo founder,
full-stack builder
I'm Matt Stvartak. 15 years shipping software at places like General Motors, Synchrony, and Earnest. I've led teams, architected systems from scratch, and written more React than I'd like to admit.
OneNomad is my indie software studio. I care about craft, accessibility, and building tools that actually solve problems. No fluff. Just software that works.
How I work
Start from the problem
Every product begins with a real pain point. No solutions looking for problems. Just tools people actually need.
Ship fast, refine always
Get it into hands early. Real feedback beats hypotheticals every time. Iterate relentlessly.
Design is not decoration
Good design is invisible. It makes complex things feel simple and earns trust before a single word is read.
Let's talk
Got a project idea, want to collaborate, or just want to say hey? I'm always open to a good conversation.