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.

See more

Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
Expert
See more

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.

Education

Bachelor's degree in Computer Science at Singapore University of Technology and Design
January 1, 2011 - January 1, 2015

Qualifications

Add your qualifications or awards here.

Industry Experience

Software & Internet, Gaming, Media & Entertainment, Financial Services, Real Estate & Construction, Professional Services