Caitlyn Carmabella Nayeli

Espoo, Finland
caitlyn.c.nayeli@gmail.com | carmabella.com | linkedin.com/in/caitlyn-carmabella

Professional Summary

Full-Stack Developer and UX Designer who ships production-ready platforms at exceptional velocity. Built 146,000-line enterprise marketplace in 8 weeks and 175,000-line multi-platform integration suite—both as solo developer. Strong foundation in object-oriented programming (C, C++, Java, Python) applied to modern TypeScript and React development. Proven track record: published mobile apps, live marketplace serving real customers, and designs that outperformed expensive agency work in A/B testing. Specialized in accessible, user-centered experiences with expertise in React, React Native, TypeScript, PostgreSQL, and full-stack architecture from database to deployment.

Currently studying Information Technology at Metropolia while shipping production software for clients and open-source communities. Fluent in English; actively learning Finnish (Suomeni paranee aktiivisesti).

Skills

Development: JavaScript/TypeScript • React • React Native/Expo • Next.js • Node.js • HTML5/CSS3 • SQL • PostgreSQL • Supabase • Git • API Integration • Object-Oriented Programming (C, C++, Java, Python)

UX/Design: User Research • Information Architecture • Wireframing • Prototyping • Usability Testing • Accessibility (WCAG) • Responsive Design

Tools & Platforms: Figma • Android Studio • Tailwind CSS • Squarespace • WordPress • Adobe Suite • Jira • Slack

Specialized: Cross-platform mobile development • Database architecture & optimization • Real-time systems • Multi-platform integration • AI integration (Claude API) • Solo full-stack product development • Payment system integration • Multi-language internationalization

Education

Bachelor of Applied Science in Information Technology
Metropolia University of Applied Sciences | Espoo, Finland
August 2025 - Present

Expanding technical foundation through formal IT studies while maintaining professional freelance practice and shipping production applications.

User Experience Design Certification
Prime Digital Academy | Minneapolis, MN
April 2023 - July 2023

Completed intensive, immersive UX program emphasizing practical application and real-world projects. Collaborated with stakeholders, designers, and researchers on mobile app designs, website redesigns, and UX strategy plans. Applied comprehensive UX methodologies: Kano Analysis, Competitive Audits, User Journey Maps, Wireframing, Prototyping, Cognitive Walkthroughs, Persona Generation, Surveys, Usability Testing, and Touch-Point Strategy Maps.

Computer Engineering & Computer Science
Clemson University | Clemson, SC
2012 - 2016

Studied web design, software engineering, communication, and programming fundamentals with strong foundation in object-oriented programming through C, C++, and Java. Progressed to Python for rapid development. Focused on human-computer interaction and user-centered development approaches.

Recent Projects

Complete products shipped from concept to production, demonstrating end-to-end capabilities.

Bluumo - Enterprise Wellness Marketplace

Client Project (Founding Team Member) | November 2025 - February 2026
bluumo.fi

Solo developer who built production-grade wellness marketplace from scratch in 8 weeks—146,000 lines of code across 96 screens serving four distinct user types, replacing expensive WordPress site with platform that actually runs a business.

Platform Scale:

  • 146,000+ lines of TypeScript across 387 files

  • 96 screens serving customers, providers, corporate clients, and admins

  • 2,040 git commits in 8 weeks (avg. 255 commits/week during peak development)

  • Live on web with native iOS/Android apps in beta

Complete Business Automation:

  • Eliminated CEO's manual phone-booking bottleneck with automated two-sided marketplace

  • Corporate B2B portal with employee management, approval workflows, cost center tracking, and invoice analytics (essentially a separate SaaS product)

  • Payment integration: Visma Pay (Finnish banks/cards/MobilePay) and Edenred (wellness benefit cards) active, with Holvi, Smartum, and ePassi infrastructure ready

  • 12 automated email types via Mailgun for confirmations, reminders, notifications

Advanced Features:

  • AI concierge "Helmi" powered by Claude Sonnet 4 API for booking assistance and customer support

  • In-app voice calling via Agora SDK for direct customer-provider communication

  • 7 languages with 2,660+ translation keys across 11 namespaces

  • Gift cards with PDF generation, referral program, subscription tier (Bluumo Plus)

  • KELA reimbursement support for Finnish national health insurance

Technical Architecture:

  • 33 serverless edge functions (Deno) handling webhooks, payments, AI, and email delivery

  • Row Level Security policies enforcing multi-tenant data isolation across four user roles

  • Performance optimized: reduced interaction response time from 1,280ms to sub-200ms through StyleSheet memoization

  • Single codebase targeting iOS, Android, and responsive web via Expo

Business Impact: Complete marketplace ready for launch with real customers, corporate pilot programs lined up, revenue infrastructure operational.

Tech Stack: Expo, React Native, React 19, TypeScript, Supabase, PostgreSQL, Visma Pay, Edenred, Agora, Mailgun, Claude AI API, Vercel

CarmaClouds - Multi-Platform VTT Character Sync Suite

Open Source Project (MIT License) | 2024 - Present
carmaclouds.vercel.app

Built 175,000-line multi-platform character synchronization system as solo developer—browser extensions for Chrome and Firefox, integrations for three VTT platforms, and Discord bot—creating entirely new product category in tabletop gaming ecosystem.

Platform Scope:

  • 175,000+ lines of code spanning JavaScript and TypeScript

  • Browser extensions for Chrome (Manifest V3) and Firefox (Manifest V2) from single codebase

  • Four platform integrations: Roll20, Owlbear Rodeo, Foundry VTT (functional, pre-release), Discord bot

  • Custom build pipeline with ESBuild compiling to platform-specific distributions

Technical Complexity:

  • Adapter pattern architecture: Single DiceCloud character parsed once, transformed for each platform's unique data structures

  • D&D 5e rule engine with 50+ edge cases (Hexblade's Curse, finesse weapons, expanded crit ranges, class features)

  • Meteor DDP protocol client with request queueing for non-standard API communication

  • Real-time sync via Supabase subscriptions with cloud character storage

Platform-Specific Adapters:

  • RollCloud (Roll20): Content script injection, draggable character sheet overlay, automatic roll modification, critical hit detection, Discord webhook integration

  • OwlCloud (Owlbear Rodeo): Native extension with character popovers, scene token creation, HTTP API communication

  • FoundCloud (Foundry VTT): D&D 5e system integration with class Items, custom character sheet, dark mode, portrait upload via Supabase storage

  • Pip2 (Discord Bot): 20+ slash commands for dice rolling, character management, spell casting, initiative tracking

What Makes It Hard:

  • Each VTT structures data completely differently (Roll20 attributes vs. Foundry Items vs. Owlbear format)

  • Edge cases are the product—handling hundreds of D&D 5e interactions players actually encounter

  • Chrome MV3 vs. Firefox MV2 have fundamentally different architectures (service workers vs. background scripts)

Current Status: Active development demonstrating multi-platform integration architecture. RollCloud 85-90% complete, OwlCloud 95% complete, FoundCloud 70% complete (installable for testing via manifest URL). On hold to prioritize revenue-generating work (Bluumo).

Tech Stack: JavaScript, TypeScript, Node.js, ESBuild, Supabase, PostgreSQL, Next.js, React, Discord.js, Meteor DDP, Chrome/Firefox Extension APIs, Foundry VTT API, Owlbear Rodeo API

Dice Cat - Published Tabletop Gaming Matchmaking App

Personal Project | 2024 - 2026
play.google.com/store/apps/details?id=com.dicecat.app

Built and published cross-platform mobile app connecting tabletop gamers for in-person play—complete journey from UX research through development to live product on Google Play Store.

End-to-End Product Development:

  • Conducted user research with 15+ participants, built validated Figma prototype

  • Developed full production app with complex matchmaking algorithm

  • Published to Google Play Store with active downloads and user base

  • Complete rebrand (formerly "Meeplr") due to trademark research, improving user recall and brand identity

Smart Matching Algorithm:

  • Multi-dimensional matching: game libraries, location (PostGIS radius queries), availability overlap, play preferences with weighted scoring

  • Optimized complex queries from 3-5 seconds to sub-500ms through strategic database indexing

Technical Features:

  • Real-time connection updates via Supabase subscriptions

  • In-app messaging with encryption

  • Custom avatar builder with layered SVG rendering

  • Push notifications via FCM for connection requests

  • Comprehensive game database (10,000+ titles) with manual addition for niche games

Secure Architecture:

  • Row Level Security policies protecting user data while enabling matchmaking

  • Real-time state synchronization across devices without polling

Tech Stack: React Native (Expo), TypeScript, PostgreSQL, Supabase, FCM, Android Studio

Modular Business Website Framework

Client Projects | 2025-2026

Built reusable website architecture deploying fully-customized small business sites in 3-5 hours from single codebase—handling e-commerce, bookings, galleries, and admin dashboards while maintaining unique brand identities.

Efficiency Achievement:

  • Initial framework: ~8 hours (database schema, core pages, admin dashboard)

  • Subsequent deployments: 3-5 hours each (40-60% time reduction)

  • Three live sites serving different industries (crafts, services, metaphysical goods)

Technical Architecture:

  • CSS variable-based theming with automatic WCAG AA contrast calculation

  • Configuration-driven deployment (update database settings, swap assets, deploy)

  • Payment-processor-agnostic schema (easy to swap Square → Stripe → PayPal)

  • Multi-image support with backward compatibility

  • Commission Kanban board with drag-and-drop ordering

Performance:

  • React.memo optimization eliminating unnecessary re-renders

  • WebP conversion: 94.7% file size reduction (902KB → 48KB backgrounds)

  • Dynamic imports reducing initial bundle by ~40%

  • Lighthouse Performance score: 95+

Live Sites: designsbyadino.com, amyshenhouse.com, umbralgarden.com

Tech Stack: Next.js 16, React 19, TypeScript, Tailwind CSS 4, Supabase PostgreSQL, Square Payments, Resend

Professional Experience

Freelance Full-Stack Developer & UX Designer

July 2023 - Present | Remote

Managed 4+ concurrent client projects, delivering end-to-end solutions from user research through deployment. Specialized in transforming underperforming websites into user-centered digital experiences.

Divergent Realms - Two-Sided TTRPG Marketplace | divergentrealms.com

  • Beat Agency Work: 5-hour homepage redesign outperformed previous agency's 3-month, $3,000+ version in A/B testing

  • Three Discovery Paths: Architected information structure serving different user journeys (browse GMs, direct booking, join existing games)

  • Platform Migration: Rebuilt WordPress site on Squarespace with custom booking systems, payment flows, and responsive design

  • Interactive Features: Developed hidden dungeon-crawl text adventure (Konami code trigger) demonstrating advanced JavaScript and game logic

  • Ongoing Optimization: Iterative improvements based on real user feedback and analytics

NeuroSweetSpot - Accessible Resource Hub | neurosweetspot.com

  • 1-Week Complete Redesign: Delivered full platform migration, IA restructuring, accessibility implementation, and custom features

  • Information Architecture: Organized 120+ scattered articles into intuitive 3-level hierarchy (6 user journeys → themed categories → sequential content)

  • Accessibility-First: Implemented WCAG AA standards including screen reader optimization, high contrast, semantic HTML for neurodivergent users

  • Custom Development: Built 3,000+ line JavaScript creature-catching game with Supabase database integration and site-wide search functionality

  • Performance: Optimized site speed and maintained SEO during WordPress to Squarespace migration

Additional Client Work:

  • Implemented responsive designs using React, JavaScript, and modern CSS frameworks

  • Integrated payment systems and managed SQL databases for dynamic, data-driven experiences

  • Applied user research methodologies to inform design decisions

  • Utilized Git version control and CI/CD practices for all projects

Information Technology Student

Metropolia University of Applied Sciences | August 2025 - Present

Pursuing Bachelor of Applied Science in Information Technology while maintaining freelance work and shipping production software.

UX Designer

MNFurs (Non-Profit) | November 2022 - December 2023

Volunteer role supporting local non-profit organization.

  • Conducted user research and created wireframes for website redesign initiative

  • Collaborated with stakeholders to identify pain points and propose UX improvements

  • Applied user journey mapping and usability analysis methodologies

Owner & Entrepreneur

Carmabella Creations | 2016 - 2023

Built and scaled personal brand business with full-stack technical implementation, managing marketing strategy through e-commerce development and customer engagement.

IT Consultant & Full-Stack Developer

UnVale | 2021 - 2022

Embedded technical consultant with 3-person early-stage startup team, working directly with founders during formative technical phase.

  • Fast-Paced Startup Environment: Shipped features end-to-end with limited resources and high velocity requirements

  • Technology Stack Decisions: Consulted on architecture choices for core platform

  • Direct Collaboration: Worked without PM layer, incorporating feedback directly from founders and early users

  • Full-Stack Development: Built web applications using JavaScript, React, HTML, CSS, SQL

Tech Stack: JavaScript, React, HTML, CSS, SQL

IT Assistant, Researcher & Developer

Clemson University | 2012 - 2016

  • Conducted independent research in Human-Centered Computing department

  • Collaborated with Virtual Reality Lab on educational STEM program for young women

  • Developed VR applications leveraging object-oriented principles in C#, Java, and web technologies

  • Applied programming fundamentals learned in C and C++ to higher-level development

  • Provided department IT support

What Sets Me Apart

I Ship Products at Scale: Built 146,000-line enterprise marketplace and 175,000-line multi-platform integration suite as solo developer. Published mobile app on Google Play Store. Live platforms serving real users and generating revenue.

Exceptional Velocity: Rebuilt entire marketplace in 8 weeks (2,040 commits); designed homepage that beat 3-month agency version in 5 hours; delivered complete redesigns in 1 week.

Full-Stack Mastery: User research → wireframes → database architecture → payment integration → native mobile apps → production deployment. Can handle every layer of the stack independently.

Architectural Thinking: Built adapter pattern systems, configuration-driven frameworks, and payment-processor-agnostic architectures that scale across multiple deployments.

Accessibility Champion: Deep understanding of neurodivergent users and WCAG standards, creating genuinely inclusive experiences that serve diverse audiences.

Solo Capability with Team Experience: Can deliver complete products independently (proven with Bluumo, CarmaClouds, Dice Cat) while collaborating effectively with stakeholders, founders, and clients.