Bayo – Node.js, Solidity, Blockchain, experts in Lemon.io

Bayo

From Panama (UTC-5)flag

Blockchain Engineer|Middle-to-senior
Back-end Web Developer|Middle-to-senior

Bayo – Node.js, Solidity, Blockchain

Bayo is a blockchain engineer with 14 years of experience in software development, working with Node.js, NestJS, TypeScript, Solidity, and both SQL and NoSQL databases. Showed solid knowledge of event-driven architecture, idempotency, retries with exponential backoff and caching, and has built blockchain data services, a TypeScript SDK used by external integrators and an on-chain circuit breaker that has been in production since about 2023. Has led a team of engineers on a stablecoin protocol and delivers full-stack products with React and Next.js. Uses Claude Code and Codex daily and built an open-source framework for running coding agents in parallel.

14 years of commercial experience in
AI
Blockchain
Cryptocurrency
Fintech
Web3
Main technologies
Node.js
4 years
Solidity
4 years
Blockchain
5 years
Nest.js
4 years
SQL
13 years
Smart contracts
1 year
Claude Code
1 year
AI agent orchestration
1 year
AI-assisted coding
1 year
Microservices
1 years
Distributed Systems
1 years
Additional skills
Typescript
React
Ethers.js
ASP.NET CORE
C#
Next.js
API
Ethereum
web3.js
ASP.NET MVC
VB.NET
.NET
Direct hire
Possible
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Experience Highlights

Creator and sole engineer
Sep 2026 - Sep 2026
Project Overview

Open-source framework for running many AI coding agents in parallel on one repository, safely. Each agent works in its own git worktree under coordinators that brief, gate and merge its work.

Project gallery:
Portfolio example for Skein by Bayo, Creator and sole engineer
Responsibilities:
  • Designed the task graph with disjoint file ownership, so two agents never write the same file.
  • Built a merge gate agents can't weaken: clean tree, file ownership, test integrity and repo invariants, then the task's own acceptance commands.
  • Added cross-model adversarial review, where a second model reviews the first model's work on anything touching money or personal data.
  • Built it as a Node/TypeScript CLI with a GitHub-issue task board and pluggable drivers for different coding agents, and uses it on every repo he works on, including Mento's CLI.
Project Tech stack:
Typescript
Node.js
Git
GitHub Actions
Claude Code
Full-stack engineer
May 2026 - Sep 20264 months
Project Overview

Work marketplace where humans and AI agents hire each other under explicit, weighted acceptance criteria. Payment only releases when the work meets them.

Project gallery:
Portfolio example for Kept by Bayo, Full-stack engineer
Portfolio example for Kept by Bayo, Full-stack engineer
Portfolio example for Kept by Bayo, Full-stack engineer
Responsibilities:
  • Built two settlement rails: Stripe for human buyers, and USDC escrow for agents through a Foundry-built contract on Base.
  • Recorded every resolution on-chain with EAS attestations, so a provider's reputation is portable and anyone can recompute it.
  • Built the full-stack app in Next.js and Postgres.
Project Tech stack:
Typescript
React
Next.js
PostgreSQL
Solidity
Stripe API
EAS
Viem
Senior Full Stack Engineer
Oct 2022 - Aug 20263 years 9 months
Project Overview

Multi-collateral stablecoin protocol, spun out of a major blockchain lab, that has settled $30B+ in cumulative on-chain volume across Celo, Polygon and Ethereum.

Project gallery:
Portfolio example for Mento Labs by Bayo, Senior Full Stack Engineer
Portfolio example for Mento Labs by Bayo, Senior Full Stack Engineer
Portfolio example for Mento Labs by Bayo, Senior Full Stack Engineer
Portfolio example for Mento Labs by Bayo, Senior Full Stack Engineer
Responsibilities:
  • Joined as a founding engineer, led a team of 6 engineers for two years after the spin-out from cLabs, and set up the engineering process, release cadence and hiring, then returned to hands-on IC work by choice.
  • Coordinated the protocol's CertiK security audit and owned the fixes through to mainnet. It shipped with no critical findings.
  • Built the QA and invariant-testing framework the team still uses to gate releases.
  • Designed and shipped the on-chain circuit breaker for stable assets: modular breaker contracts behind a facade, deviation checks on oracle reports, and automatic halt and recovery, in production since about 2023. Also delivered trading limits and oracle protections.
  • Created the mento-core Foundry repo and wrote the deployment scripts for launching 10+ stablecoins.
  • Sole author of the Mento TypeScript SDK, including the v3 rewrite (viem-native, 258 files) that external integrators use to quote and execute swaps.
  • Built the analytics API from scratch in NestJS, with caching, cache warming, retries, rate limiting, structured logging and Sentry, deployed on GCP Cloud Run. It replaced 4,000+ lines of in-browser chain logic on reserve.mento.org.
  • Shipped the Mento web apps (swap, liquidity, borrowing, governance, reserve dashboard) in Next.js, wagmi and viem, including the v3 interface. The apps had 700,000+ visitors in the last 12 months.
  • Ran a team of AI agents inside the engineering org (engineering manager, front-end dev, QA). The QA agent audited 4 repos and opened 21 fix PRs in 15 days. 6 were merged, including SDK test coverage going from 42% to 90%.
  • Made 460+ commits and 239 merged PRs across 25 public Mento repositories.
Project Tech stack:
Typescript
Solidity
Node.js
Next.js
Nest.js
React
Viem
Wagmi
Ethers.js
HardHat
GraphQL
Docker
GCP Compute Engine
Vercel
GitHub Actions
Sentry
Jest
Ethereum
Polygon
Engineer
Feb 2025 - Feb 2025
Project Overview

A cross-chain liquidity routing system for autonomous agents, built at ETHDenver 2025.

Responsibilities:
  • Won 3 ecosystem prizes (Base, Optimism, Unichain).
  • Selected for the OP Labs Interop Incubator.
Project Tech stack:
Typescript
Solidity
Viem
Blockchain
Open-source contributor
Jan 2021 - Feb 20221 year 1 month
Project Overview

Contract, UI and testing work for three DeFi protocols during the move from traditional finance into Web3.

Responsibilities:
  • SushiSwap: built the automated end-to-end testing framework and CI workflows for the Trident router and UI, and contributed to multi-hop routing logic.
  • Snowball: shipped DEX aggregator contracts and the UI integration.
  • ArcherDAO: built a gasless limit-order system where signed transactions are submitted to a private miner network.
Project Tech stack:
Solidity
Typescript
React
HardHat
Ethers.js
web3.js
GitHub Actions
Ethereum
Senior Software Engineer
Sep 2016 - Dec 20215 years 3 months
Project Overview

A global entity-management platform serving regulated financial institutions and fund administrators. It holds corporate and fund entity data that clients and regulators rely on.

Responsibilities:
  • Built reporting modules and APIs for the platform.
  • Built an OAuth 2.0 authentication server that secured external API access to client entity data.
  • Designed centralised logging on Elasticsearch, Kibana and Filebeat, which cut production incident resolution time.
  • Led adoption of .NET Core, CI/CD pipelines and containerisation across engineering teams.
Project Tech stack:
.NET Core
.NET
C#
ASP.NET CORE
Microsoft SQL Server
OAuth
ElasticSearch
Kibana
Docker
Azure DevOps
Software Engineer
Jun 2015 - Sep 20161 year 3 months
Project Overview

Electronic trading systems for an inter-dealer broker's inflation trading desk.

Responsibilities:
  • Built the orderbook and matching engine for the inflation trading desk, where latency and correctness were contractual.
Project Tech stack:
C#
.NET
WCF
Microsoft SQL Server
Graduate .Net Developer
Jul 2013 - May 201410 months
Project Overview

Internal web applications team at a telecom operator, building n-tier line-of-business applications.

Responsibilities:
  • Developed n-tier applications using Microsoft web development tools such as MVC and C#.
  • Developed functionality from user stories using the MVC pattern and the TDD process.
  • Assisted and trained colleagues in web development technologies, programming languages, and frameworks.
  • Trained several graduates in using the MVC pattern and C# programming.
  • Presented in-house applications to various teams.
  • Documented processes and created technical documentation on application deployment guides.
  • Assisted in creating test lab environments, deployed applications, and configured machines.
  • Worked with the build master to ensure lab environments were configured correctly so that applications could be tested.
Project Tech stack:
C#
ASP.NET MVC

Education

2012
Computer Software Engineering
Bachelor of Science (BSc)

Languages

Spanish
Intermediate
English
Advanced

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