Alexander Marfel
Frontend Tech Lead / Team Lead
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Projects
Selected work with short context: what it is, why it matters, and what I delivered.
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Analytics
Android
API Contracts
Axios
Backend
Budgeting
Canvas
Charts
Chrome Extension
CI/CD
commitlint
CRACO
CSS Variables
Cypress
Data modeling
Design System
Docker
DX
ESLint
Flow
Forms
GitHub Actions
H2
Helm
Hibernate
Husky
i18n
Import pipeline
iOS
Java
JPA/Hibernate
JWT
Maven
Micro-frontends
Next.js
Personal finance
Playwright
PostgreSQL
Prettier
Privacy-first
React
React Native
Redux
Redux Toolkit
redux-persist
Redux-Saga
Release Engineering
REST
Retrofit
RTK Query
SASS
SCSS
SDK
Solana
Spring
Spring Boot
Spring Security
SQL
SSR
Storybook
Swagger
Three.js
Tooling
Trading
TypeScript
Viem/Wagmi
Vite
Vitest
Vue 2
Vuex
Wallets
Web Workers
Web3
Webpack
WebSocket
Zustand
Commercial Projects
CI/CD: Single Build → Promote
2024–Present
A release process that promotes build artifacts across environments/regions without rebuilding.
CI/CD
Docker
Release Engineering
GitHub Actions
Frontend Platform (UI Kit + Packages)
2024–Present
A shared frontend platform: internal UI kit, core packages, API SDK, and unified tooling.
React
TypeScript
Storybook
Design System
Internal UI Kit (React + Storybook)
2024–Present
An internal UI kit with design tokens, theming via CSS variables, and Storybook docs.
React
TypeScript
Storybook
Design System
Tooling Config Packages (ESLint/Prettier/Hooks)
2024–Present
Shared config packages to standardize lint/format/commit rules and TS configs across repos.
ESLint
Prettier
commitlint
Husky
TypeScript API SDK (Shared Contract)
2024–Present
A shared TypeScript SDK that keeps API usage consistent across multiple apps.
TypeScript
SDK
Axios
CI/CD
Vilavi User Portal (Vite + React)
2024–Present
A Vite-based user portal with clean core layers (providers/router/i18n) and a stable delivery baseline.
Vite
React
TypeScript
Redux Toolkit
Vilavi Web Shop (Next.js App Router)
2024–Present
E-commerce web shop built on App Router with i18n, forms, and disciplined delivery for frequent releases.
Next.js
React
TypeScript
i18n
Mobile Shop Dev Flow (React Native)
2024–2025
React Native project support focused on developer experience and reproducible setup.
React Native
TypeScript
iOS
Android
Photon Protocol Web (Ops Dashboard)
2024
A data-heavy ops dashboard with URL-synced filters and performance tuning for table screens.
React
TypeScript
Redux Toolkit
Redux-Saga
Borpa dApp (EVM + Solana)
2023–2024
A multichain dApp with transaction UX, wallet state handling, and reliability improvements.
Next.js
React
TypeScript
Web3
Monitoring System Frontend
2023–2024
A monitoring system frontend built from scratch with real-time updates, clear architecture, and delivery tooling.
React
TypeScript
Redux Toolkit
Redux-Saga
Trillion dApp (Liquidity Pools UI)
2023–2024
Liquidity pool UI with context-aware wallet connection flows and build stability fixes.
Next.js
React
TypeScript
Web3
Web3 dApp Integrations (EVM + Solana)
2023–2024
Wallet flows and on-chain interactions with a focus on correctness and robust UX states.
Next.js
React
TypeScript
Web3
3D Visualization Builder (Three.js)
2022–2023
Interactive 3D scenes for product assembly and warehouse object tracking.
React
TypeScript
Three.js
Redux-Saga
Backend Contracts & API Collaboration
2022
API contract and backend architecture collaboration to keep FE/BE integration predictable.
API Contracts
Backend
TypeScript
REST
Rarible SDK Integration Work
2022
Wallet connector integration work to stabilize Web3 user journeys.
Web3
Wallets
TypeScript
SDK
Watermarked App Frontend
2022
Frontend features and UX stability improvements in a React/TypeScript codebase.
React
TypeScript
Redux-Saga
SASS
Web3 Marketplace Frontend
2022
A modular React/TypeScript app with wallet integrations and a production-focused build setup.
React
TypeScript
Web3
Redux-Saga
Broker Client Portal (Real-time)
2021–2022
A data-heavy client portal with REST + WebSocket integrations and real-time UX.
React
TypeScript
Redux-Saga
WebSocket
Client Portal (CRA + TS)
2020–2021
A client personal area with auth/profile/security flows and a strong DX baseline.
React
TypeScript
Redux-Saga
redux-persist
Koshelek Service: Account
2020–2021
User profile/security flows as a micro-frontend service within an SSR platform.
Vue 2
SSR
Micro-frontends
Vuex
Koshelek Service: Advertisement
2020–2021
Service-level UI for advertisement flows within a micro-frontends wallet product.
Vue 2
Micro-frontends
Vuex
SSR
Koshelek Service: Advertisement Editor
2020–2021
Editing workflows and UI logic for advertisement management within the platform.
Vue 2
Micro-frontends
SSR
Vuex
Koshelek Service: P2P
2020–2021
P2P flows as a service-level frontend in a micro-frontends wallet platform.
Vue 2
Micro-frontends
Vuex
REST
Micro-frontends SSR Platform
2020–2021
A micro-frontends platform with SSR, shared UI foundations, and multiple service-level frontends.
Vue 2
SSR
Micro-frontends
Vuex
Translation Management UI
2020–2021
A UI for managing translation keys with multi-environment support and API integration.
React
TypeScript
Redux-Saga
SASS
AML & Trading Interfaces (Enterprise UI)
2019–2020
A modular enterprise UI for AML/trading bots with charts, forms, and DX tooling.
React
Flow
Redux-Saga
Charts
Monitoring & Admin UIs (Microservices)
2019–2020
Monitoring/admin interfaces built in a microservices context (REST/WS integrations).
React
Redux
Redux-Saga
WebSocket
Full-stack Product Delivery (Java/Spring + React)
2018–2019
End-to-end delivery across backend (Spring/Hibernate) and web UI (React/Redux).
Java
Spring
Hibernate
React
Personal Projects (Public)
Browser Tabs Manager
A privacy-friendly Chrome extension to capture tab sessions, manage them in a dedicated UI, and restore/export/import later.
Chrome Extension
React
TypeScript
Vite
Personal Projects (Private)
Life Emulator
A React + TypeScript web app that simulates simple lifeforms in a virtual environment.
React
TypeScript
Vite
Zustand
Personal Finance
A private personal finance tracker focused on clean transaction workflows, budgeting, and analytics.
Personal finance
Budgeting
Data modeling
Import pipeline
Trader Backend
A Spring Boot backend for trading workflows with authenticated APIs and exchange integration.
Java
Spring Boot
Spring Security
JWT