Product foundations
CRM and SaaS work connected React interfaces with NestJS services, PostgreSQL models, and client-facing workflows.
Product work, end to end
I own end-to-end features across frontend, backend, databases, third-party integrations, and business-critical workflows.
6+ years building SaaS products, marketplaces, booking and scheduling systems, CRM platforms, and AI-enabled applications.
The work widened from product foundations to cross-stack delivery.
Broader systems
AI tools, marketplaces, and training products expanded ownership across services, data, integrations, and product workflows.
Cross-stack delivery
Scheduling, asset, and rental platforms paired Vue, React, FastAPI, NestJS, PostgreSQL, and MongoDB with direct client work.
Reliability ownership
Current work focuses on concurrency, data consistency, payment reliability, search performance, and real-time application flows.
Choose a domain to see the tools behind the work.
- TypeScript
- JavaScript
- React
- Next.js
- Vue.js
- Nuxt
- React Native
- TanStack Query
- Redux Toolkit
- Zustand
- Ant Design
- TailwindCSS
- Material UI
- Responsive Design
Six products with real interface screenshots, responsibilities, technologies, and results taken directly from my CV.
Oh My Oppa
Mobile travel marketplace connecting tourists with Korean tour guides through booking, payments, real-time chat, and reviews.
Project highlights
- Built
- Built booking, payment, real-time chat, and guide workflows across React Native, NestJS, Prisma ORM, and PostgreSQL.
- Reliability
- Used explicit state transitions, idempotent provider-event processing, transactions, and reconciliation to keep payment state consistent.
- Recovery
- Persisted chat with message deduplication and reconnect synchronization after network interruptions.
- React Native
- NestJS
- Prisma ORM
- PostgreSQL
- PayPal
- Toss Payments
Referee Hub
Platform for managing referee availability, match requests, bookings, and assignments.
Project highlights
- Built
- Built availability, match-request, booking, and assignment workflows across Vue.js, Nuxt, FastAPI, and PostgreSQL.
- Conflict protection
- Combined interval-overlap validation with a PostgreSQL exclusion constraint to prevent conflicting assignments.
- State integrity
- Kept scheduling state authoritative on the backend and refetched affected data after mutations.
- Vue.js
- Nuxt
- FastAPI
- PostgreSQL
Scout
Job marketplace linking talent with employers.
Project highlights
- Built
- Built job listings, applications, business profiles, search, and filtering across Vue.js, Nuxt, FastAPI, and PostgreSQL.
- Search
- Combined server-side filtering and pagination with debounced queries, caching, and cancellation or rejection of stale requests.
- Delivery
- Used SSR for public pages while keeping search and application workflows client-driven.
- Vue.js
- Nuxt
- FastAPI
- PostgreSQL
- SSR
Simpson and Partners
Customer-facing EV charger comparison platform built on Next.js and a headless WordPress CMS.
Project highlights
- Built
- Developed Next.js and TypeScript pages for customers comparing home EV charger options.
- Performance
- Reduced initial page payload by about 30% and improved first-load consistency through optimized media and cleaner CMS fetches.
- Content system
- Mapped the WordPress content model into typed customer-facing comparison components.
- Next.js
- TypeScript
- Headless WordPress
SarsiAI
AI-powered mobile application that helps users improve ChatGPT prompts through OpenAI API workflows.
Project highlights
- Built
- Developed FastAPI services for prompt-improvement workflows backed by MongoDB.
- Integration
- Integrated OpenAI API features into the mobile product and supported the Flutter client.
- Performance
- Cut prompt-improvement response times by about half and reduced validation retries with clearer schemas and MongoDB indexes.
- Python
- FastAPI
- MongoDB
- OpenAI API
- Flutter integration
Review Writer
AI-powered SaaS platform generating personalized customer review replies across travel and local business platforms.
Project highlights
- Built
- Built review response workflows across Next.js screens, NestJS services, and large review data views.
- AI workflow
- Integrated OpenAI API features to generate editable draft replies for customer reviews.
- Impact
- Helped support teams draft replies faster while clearer service boundaries reduced failed platform sync retries by about one-third.
- Next.js
- NestJS
- OpenAI API
Five more products across rentals, training, CRM, digital assets, and airport operations.
Flygplastbolaget
Airport booking platform for managing landing strip reservations, customer agreements, administration, and Fortnox invoicing.
React / Express / MongoDB / FortnoxColiving
Platform for managing rental properties, tenants, and administrative workflows.
React / NestJS / PostgreSQL / CursorTexture Studio
Digital library for architects, designers, 3D artists, and manufacturers to browse PBR textures, 3D models, HDRIs, and brand portfolios.
Vue.js / Nuxt / FastAPI / PostgreSQLTrainix
Driver training platform for courses, assignments, progress tracking, completion state, and training media.
React / NestJS / PostgreSQL / AWSG-Signal
CRM platform with client-facing operational workflows.
React / NestJS / PostgreSQL