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Hi, I’m Leon Cosby, a web3 enthusiast and software engineer with over a decade of experience and contributions to the crypto market since 2018. I’m a full stack developer who focuses on building financial solutions that empower people and drive meaningful impact. I collaborate with teams to turn ambitious ideas into robust, user-friendly products. After a year of focusing on AI and ML, I’m applying modern AI tooling to real-world projects, delivering strong commits and pushing forward innovative solutions in the AI/ML space. I’m passionate about continuous learning, practical experimentation, and creating forward‑looking software that helps people succeed.…Hi, I’m Leon Cosby, a web3 enthusiast and software engineer with over a decade of experience and contributions to the crypto market since 2018. I’m a full stack developer who focuses on building financial solutions that empower people and drive meaningful impact. I collaborate with teams to turn ambitious ideas into robust, user-friendly products. After a year of focusing on AI and ML, I’m applying modern AI tooling to real-world projects, delivering strong commits and pushing forward innovative solutions in the AI/ML space. I’m passionate about continuous learning, practical experimentation, and creating forward‑looking software that helps people succeed.

Leon Cosby

Full Stack Developer, Blockchain Developer, Back-End Developer, +3

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Hi, I’m Leon Cosby, a web3 enthusiast and software engineer with over a decade of experience and contributions to the crypto market since 2018. I’m a full stack developer who focuses on building financial solutions that empower people and drive meaningful impact. I collaborate with teams to turn ambitious ideas into robust, user-friendly products. After a year of focusing on AI and ML, I’m applying modern AI tooling to real-world projects, delivering strong commits and pushing forward innovative solutions in the AI/ML space. I’m passionate about continuous learning, practical experimentation, and creating forward‑looking software that helps people succeed.…Hi, I’m Leon Cosby, a web3 enthusiast and software engineer with over a decade of experience and contributions to the crypto market since 2018. I’m a full stack developer who focuses on building financial solutions that empower people and drive meaningful impact. I collaborate with teams to turn ambitious ideas into robust, user-friendly products. After a year of focusing on AI and ML, I’m applying modern AI tooling to real-world projects, delivering strong commits and pushing forward innovative solutions in the AI/ML space. I’m passionate about continuous learning, practical experimentation, and creating forward‑looking software that helps people succeed.

Available to hire

Hi, I’m Leon Cosby, a web3 enthusiast and software engineer with over a decade of experience and contributions to the crypto market since 2018. I’m a full stack developer who focuses on building financial solutions that empower people and drive meaningful impact. I collaborate with teams to turn ambitious ideas into robust, user-friendly products.

After a year of focusing on AI and ML, I’m applying modern AI tooling to real-world projects, delivering strong commits and pushing forward innovative solutions in the AI/ML space. I’m passionate about continuous learning, practical experimentation, and creating forward‑looking software that helps people succeed.

Skills

Experience Level

Expert

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Language

English

Fluent

Work Experience

Founding developer & Blockchain Lead at Demonopol

January 1, 2025 - Present

Led backend & smart contract development for Demonopoly Game MVP; developed D.Cashflow Wallet; led architecting real estate launchpad & tokenization; developed Alpha NFT Collection adaptive to cross-chain; participated in building AI Agent for the game; created initial educational DAO phrase among real estate investors.

Founding developer at Grape Fi, Vinium Fi, UP Fi

January 1, 2022 - January 1, 2024

Developed wrap version of DEGEN (rebase token) and swap sicle zapper; built Grapefi dashboard and LP node compounding; led UI revamp; developed multi-token UP NFT staking contract and user-friendly staking UI; launched USDC-backed beefy vault v6-like UP token contract and UI; launched Vinium core lending contracts on AVAX C-Chain; built liquidation bot; created analytic views (Dune dashboards).

Technical Advisor & Blockchain Director at Truflation / Enderprotocol

January 1, 2023 - January 1, 2023

Designed Ender bonding backed by staked liquidity; authored rebasing algorithm theory for bonding rewards; implemented refractional NFT bonding fee distribution; treasury backing system with END token; created reserve funding model for protocol ecosystem; refactored data pipeline.

Senior Full Stack Developer | Web3 Lead at Brewlabs

January 1, 2022 - January 1, 2023

Developed swap router, zapper, staking vault contracts for Brewlabs v1; upgraded to v2 – Earn; built cross-chain BREWS token bridge; launched v2 swap router with stable swap and flexible fee management; created swap aggregator and subgraph; integrated UI with contracts.

Full Stack Developer at Audacelabs

January 1, 2021 - January 1, 2022

Developed exchange agent; off-chain and on-chain covers; contributed to TribeOne core contracts; improved backend performance and refactored heavy React frontend to communicate with Node.js/Express REST APIs; designed backend APIs and mock API.

Chief Web3 Officer | Co-Founder at Croxswap

January 1, 2021 - January 1, 2021

Developed croxswap core contracts including masterchef, factory, cross-chain bridge; dual farm; XPad (multi-chain ICO Launchpad), VPot, Referral program; conducted farming events with 2M TVL; improved UI kit; proposed architectural changes to improve efficiency.

Senior Full Stack Developer at TuumTech

January 1, 2020 - January 1, 2022

Built admin platform for managing platform's database entities and users; delivered 200+ issues; developed MTRL – material network utility token for DID ownership; login with Elastos Essential mobile app; integrated Elastos hive and onboarding of elacityNFTs; assisted Elastos essential team with SDKs.

Full Stack Developer at Introlligent Inc

January 1, 2018 - October 31, 2018

Developed and maintained React/Next.js app; architected DynamoDB and Functions backend; provided TypeScript coaching; set up CI/CD; expanded data models for scheduling/CRM-like data.

Intern / MERN Stack Developer at Introlligent Inc

January 1, 2015 - January 1, 2016

Worked with React.js and Node.js; problem analysis across frontend and backend; implemented APIs and server-side features; created unit tests for API endpoints; redesigned database and API for consistency and performance.

Founding developer & Architect engineer at SuiMarket

January 1, 2025 - Present

Designed orderbook engine leveraging sui deepbook; developed on-chain smart contracts for custodial wallets (balanceManager) and market control; designed and developed UMA bridge (connector + adapter) for market resolution in sui using Wormhole relayer; developed data pipeline using sui custom indexer for real-time on-chain/off-chain data streaming; contributed to UI/UX and contract integration.