# Hi, I'm Alex. I build full-stack products end to end.

Alex Cloudstar, senior full-stack developer (https://alexcloudstar.com/)

Senior full-stack developer with 8+ years building SaaS products and AI features. Based in Romania, I take freelance and contract work from clients across Europe and the US, and I am open to senior full-time roles. I have shipped for ING (through HCL Technologies), E.ON, Warner Bros. Entertainment and US startups. Two-time HackerNoon Contributor of the Year.

## Working as a freelance full-stack developer
- **Role**: Senior full-stack developer
- **Experience**: 8+ years, since 2018
- **Based in**: Romania, working with clients across Europe and the US
- **Available for**: Freelance and contract work, consulting and senior full-time roles
- **Clients**: E.ON, ING (via HCL Technologies), Warner Bros. Entertainment
- **Stack**: TypeScript, React, Next.js, Node.js, NestJS, PostgreSQL, AWS, Claude API, MCP

## Right now
- **Building**: statusline-pro, a configurable status line for Claude Code.
- **Writing**: Weekly posts on AI tooling, devtools and shipping software.
- **Learning**: Going deeper on Python and LLM engineering: evals, fine-tuning and agent reliability.
- **Available**: Taking on new contract work and open to senior full-time roles. Email me what you are building.

## Experience as a senior full-stack engineer
- **Senior Full-Stack Developer** (2020 – Now): Freelance · SaaS products and AI features for clients
- **Senior Full-Stack Developer** (2023 – 2024): Omnisource Technologies · contract, full-stack features, remote team
- **Senior Full-Stack Developer** (2022 – 2023): E.ON Deutschland · contract, large-scale energy platform
- **Frontend Developer** (2021 – 2022): HCL Technologies · contract, ING Nederland design system
- **Full-Stack Developer** (2020 – 2021): Makeen · contract, client placements at Warner Bros. Entertainment
- Full timeline: https://alexcloudstar.com/experience/

## Tech stack
### Languages
TypeScript first. JavaScript and PHP from earlier client work, Python for LLM experiments.
TypeScript, JavaScript, PHP, Python

### Frontend
React and Next.js with Tailwind CSS, Redux or Zustand for state, Storybook for component libraries.
React, Next.js, Tailwind CSS, Redux, Zustand, Storybook

### Backend
Node.js APIs with NestJS or Express, over REST and GraphQL.
Node.js, Express, NestJS, GraphQL, REST

### Databases and ORMs
PostgreSQL first, with Prisma or Drizzle. MongoDB and Redis where the data calls for them.
PostgreSQL, MongoDB, Redis, Prisma, Drizzle

### Infra
AWS and Vercel for hosting, Docker and GitHub Actions for delivery, Azure on the E.ON project.
AWS, Vercel, Docker, Azure, GitHub Actions

### AI / LLM
Claude API and the Vercel AI SDK for features with tool calling and retrieval, MCP servers, and Claude Code in daily work.
Claude API, Claude Code, Vercel AI SDK, RAG, MCP

Full list: https://alexcloudstar.com/tech-stack/

Need a senior full-stack developer? [Get in touch](https://alexcloudstar.com/contact/)