São Paulo, BrazilOpen to software engineering roles
LucasSilveira
Software Engineer / Full-Stack, Mobile & Web3
- experience
- 18y
- in web3
- 5y
- roles
- 12
About.
I'm a software engineer with 18 years of experience across web, mobile and backend, including the last five building crypto products. I've worked with Ruby, JavaScript and TypeScript, native iOS and React Native, and more recently Node.js, NestJS, Next.js, PostgreSQL and Go.
Along the way I've also led teams. As CTO at Samurai Starter I owned the technical roadmap and the engineers delivering it, and earlier I worked as a Scrum Master and Tech Lead on mobile and web squads. That mix means I'm comfortable owning delivery as well as code.
On the crypto side, at TRAC Systems I worked on a self-custodial wallet ecosystem (Ledger integration, Bitcoin transaction flows, a crypto primitives library, mobile and browser wallets), and at Samurai Starter I designed and shipped Solidity contracts tested with Foundry.
On my own time I designed and shipped Phase Model in 2026, a market regime model served through a Go API and an MCP server for AI agents, with a Next.js front end, built with Claude. I use Claude and Codex daily in my development workflow. I'm currently looking for software engineering roles on teams building products where reliability and attention to detail matter.
Education
- MBA in Project ManagementFGV, Fundação Getulio Vargas, 2007–2009
- Bachelor's in Information Systems and TechnologiesUNIRP, Centro Universitário de Rio Preto, 2003–2006
Certifications
- International Scrum Master Foundation
- Scrum Fundamentals Certified (SFC)
- Mastering React Native (GoNative)
Languages
- English: Full professional
- Portuguese: Native
Stack.
Frontend
- React
- Next.js
- TypeScript
- React Native
- Swift (native iOS)
- dApps
- Wallet UIs
- Figma
Backend
- Node.js
- NestJS
- TypeScript
- PostgreSQL
- Go
- Ruby
Blockchain & Web3
- Solidity
- Foundry
- EVM
- ethers.js
- Bitcoin
- IPFS
- Ledger
Management
- CTO
- Scrum Master
- Tech Lead
Experience.
1 yr 2 mos
Blockchain Engineer / Wallet & Protocol Engineer
TRAC Systems · Germany (Remote)
Working on wallet and blockchain infrastructure for a production-grade, self-custodial crypto ecosystem, covering the P2P settlement network, crypto primitives library, mobile app, and browser extension.
Focused on designing and implementing transaction and signing systems, including:
- Hardware wallet integration (Ledger, BLE, mobile-first constraints)
- Bitcoin transaction flows (PSBT, Taproot, SegWit, UTXO management)
- Core crypto primitives (Ed25519 signing, BIP-39 derivation, bech32m address encoding, blake3 hashing)
- Secure signing and validation flows across devices and environments
- Address derivation, account management, and balance tracking
- Handling edge cases across protocol, hardware, and UX layers
Worked closely with the core team on the main product while owning the mobile app and crypto libraries independently. Responsible for ensuring correctness and reliability in user-critical flows involving funds and device interactions.
- React.js
- Node.js
- TypeScript
- Crypto
- Blockchain
- Next.js
- Figma
2 yrs 5 mos
Blockchain Engineer / CTO
Samurai Starter · Taiwan (Remote)
Led development of EVM-based smart contracts and dApps, focusing on protocol design and secure asset flows.
Designed and implemented:
- Token distribution and vesting systems
- Smart contracts handling ERC-20 payments and user balances
- Off-chain services for execution, settlement, and device interaction
- Security mechanisms including validation layers and emergency controls
Built and maintained production systems interacting with real users and funds under strict reliability requirements.
- Next.js
- React.js
- TypeScript
- Solidity
- GraphQL
- ethers.js
- Ethereum
- EVM
- Firebase
- Figma
2 yrs 2 mos
Blockchain Engineer / Front End Lead
One Ring Finance · Germany (Remote)
Worked on Solidity smart contracts, vesting systems, and token distribution logic.
Designed and implemented DeFi contracts and dApp integrations using ethers.js, focusing on secure asset flows, edge-case handling, and production-ready on-chain logic.
- Next.js
- React.js
- TypeScript
- Solidity
- GraphQL
- EVM
- Ethereum
- ethers.js
- Firebase
- Figma
1 yr
iOS Developer / Tech Lead
Ília · Brasília, Brazil (Remote)
- Acted as both hands-on developer and technical lead across multiple teams, including one mobile team and three web teams.
- Responsible for coordinating development efforts, supporting technical decisions, and ensuring delivery consistency across different products and stacks.
- Led mobile development while contributing to broader system architecture and cross-team integration.
- Focused on building reliable applications with strong emphasis on performance, usability, and maintainability.
- Swift
- React Native
- Lead Management
- Scrum Master
- Figma
2 yrs 10 mos
iOS Developer / Tech Lead
Blu · Rio de Janeiro, Brazil (Remote)
- Led development of mobile applications with focus on performance, reliability, and user experience.
- This experience later supported work on mobile crypto wallets and complex signing flows.
- React.js
- Ruby on Rails
- GraphQL
- Swift
- SwiftUI
- Lead Management
- Scrum Master
- Figma
3 yrs 2 mos
Mobile and Ruby Developer / Tech Lead
ADTsys Cloud Computing · Campinas, SP, Brazil
- React.js
- TypeScript
- React Native
- Ruby on Rails
7 mos
Ruby Developer / Process Manager
IMA (Informática de Municípios Associados) · Campinas, SP, Brazil
- Ruby on Rails
- Lead Management
1 yr 9 mos
Ruby and Mobile Developer / Project Manager
Cammino Digital · São José do Rio Preto, SP, Brazil
- Ruby on Rails
- React Native
- PostgreSQL
- MySQL
1 yr 5 mos
Front End Developer / Project Manager
Webplus Brasil · São José do Rio Preto, SP, Brazil
- JavaScript
- Adobe Flash
- Adobe Photoshop
- HTML
- CSS
1 yr 5 mos
Ruby and JavaScript Developer
CI&T · Campinas, SP, Brazil
- Worked on backend systems using Ruby on Rails, building and maintaining web applications and APIs for large-scale environments.
- Focused on application reliability, data handling, and business logic implementation within established production systems.
- Collaborated across teams and stakeholders, gaining early exposure to coordination and delivery processes while preparing for a transition into Scrum Master responsibilities.
- Ruby on Rails
- JavaScript
1 yr 3 mos
Back End Developer
Shift · São José do Rio Preto, SP, Brazil
- JavaScript
- HTML
- CSS
- D3
1 yr 2 mos
JavaScript Developer
Diginova Sites e Sistemas · São José do Rio Preto, SP, Brazil
- JavaScript
- PostgreSQL
- MySQL
- AJAX
Projects.
Personal projects under Skeletor Labs, including public repositories on GitHub. More about Skeletor Labs
Phase Model
2026Market regime model for BTC, ETH, SOL and traditional assets. Designed and shipped in about three months, built with Claude: a Go REST API, an MCP server exposing four tools to AI agents over SSE, API-key auth with public and institutional tiers, and a Next.js front end.
- Go
- MCP
- SSE
- Next.js
- Claude
www.phasemodel.xyzVisit siteskeletorlabs
TypeScriptSkeletor Labs - Front End
- bitcoin
- ble
- blockchain
- dev-studio
- evm
- figma
- ledger
- nextjs
- services-platform
- solidity
Updated GitHubcrypto-api
GoLightweight crypto data API written in Go
- api-rest
- go
samurai
TypeScriptSamurai Starter is a leading early-stage crowdfunding platform
- crypto
- defi
- evm
- figma
- ido
- launchpad
- nextjs
- reactjs
- tokens
Updated GitHubl2ve
TypeScriptL2VE is a meme token
- figma
- meme
- nextjs
- reactjs
- token
Updated GitHubskeletorlabs-contracts
SoliditySkeletor Labs - EVM Contracts
- foundry
- openzeppelin
- smart-contracts
- solidity
- tests
Updated GitHubsamurai-contracts
SoliditySamurai Starter EVM Contracts
- foundry
- openzeppelin
- smart-contracts
- solidity
- tests
Updated GitHubfoundry-l2ve
SolidityL2VE token and locker EVM Contracts
- blockchain
- evm
- foundry
- meme
- solidity
Updated GitHubchainlink-ccip-poc
SolidityChainlink CCIP using dual side send/income messages in forked test networks (OP/Base)
- chainlink-ccip
- crosschain
- foundry
- solidity
- test
Updated GitHub
Contact.
Open to software engineering roles
- linkedin.com/in/lfsilveira
- GitHub
- github.com/skeletorlabs
- Location
- São Paulo, Brazil