# 0xHALTAM

> Blog and portfolio of Gabriel Fernandes (0xHALTAM), a backend and DevOps developer with over 10 years of experience in banks, fintechs and payment systems. Focus on blockchain, applied cryptography and infrastructure, using Go, Rust, TypeScript and Python. Open to freelance work, consulting and short-term projects.

## Main pages

- [Blog](https://haltam.xyz/blog): Posts on blockchain, cryptography, backend, infrastructure and retro computing.
- [About](https://haltam.xyz/blog/whoami): Background, stack, research and what the 0xHALTAM name means.

## Topics covered

- Blockchain: Bitcoin, Ethereum, Solana, Liquid, swaps, smart contracts, tokens, OTC tooling.
- Applied cryptography: tools for regulated environments, verifiable evidence, zero-knowledge proofs.
- Backend and DevOps: Go, Rust, Python, REST, SOAP, GraphQL, containerd and OCI, actor-based systems, pub/sub, WebAssembly.
- Languages and retro computing: Erlang, OCaml, esolangs, COBOL, x86-64 and 6502 assembly, ROM hacking, DOOM modding.

## Links

- [GitHub](https://github.com/0xhaltam)
- [Codeberg](https://codeberg.org/0xhaltam)
- [X / Twitter](https://x.com/0xhaltam)
- Contact: gabriel@haltam.xyz