Thomas – Solidity, web3.js, Next.js

Non-custodial DeFi yield platform live on Arbitrum One. Users deposit any EVM token. It is swapped to USDC and deployed into Uniswap V3 concentrated-liquidity positions, which are hedged with perpetual shorts on Hyperliquid. A proprietary quantitative engine drives the ranges and hedges. Each position is a transferable ERC-721 NFT. The holder keeps sole withdrawal authority. The protocol charges a performance fee on realized profit only

• Architected and shipped the whole platform alone, from zero to mainnet in about 3 months. It spans smart contracts, backend, quant-engine service, chain indexer, subgraph, user dApp, operations console and public docs, in a 7-app monorepo.
• Designed the custody vault, position NFT and swap-router contracts: Manipulation-resistant pricing based only on TWAP, Rate-limited keeper budgets that cap the loss an automated operator can cause, A cross-chain margin bridge to Hyperliquid, Covered by 460+ unit, fuzz and stateful invariant tests, including a hostile-keeper harness and Arbitrum fork tests.
• Took the contracts through a Cyfrin security review with 0 critical findings. Fixed all 3 high-severity issues, and the auditors verified the fixes.
• Built the NestJS backend that is the platform's source of truth, backed by about 3,500 automated tests: A reorg-safe, idempotent chain indexer, NAV valuation across the on-chain and Hyperliquid legs, Keeper entry and exit pipelines and Hyperliquid order/bridge reconciliation, EIP-712 signed operator actions and Telegram alerting.
• Implemented signing through AWS KMS. Moved admin powers behind a 2-of-3 Safe multisig, with an ops console that drafts Safe proposals and toggles runtime pause switches.
• Owned infrastructure and running costs across Railway, Vercel, Neon, The Graph, Alchemy and AWS KMS. Cut RPC and KMS call volume with fewer reads per indexer pass, a subgraph-backed log source and cached key checks

DeFi yield platform that automates concentrated-liquidity positions on EVM chains and Solana: one-click zap-in from any token, automatic range rebalancing, fee compounding and exit to any token. The platform never takes custody of user funds.

• Built non-custodial LP automation contracts covering 10+ AMMs through 4 gateways (Uniswap V4 with Permit2 and native ETH, Uniswap V3 forks, Algebra, Aerodrome/Velodrome Slipstream). Each operation is one atomic transaction that leaves zero balance in the contract.
• Integrated DEX-aggregator routing for zap-in and exit swaps, and hardened it against malicious routers with dedicated theft and reentrancy regression suites and an EIP-1153 transient-storage guard.
• Wrote the Solana counterpart in Rust/Anchor: one program with CPIs into Orca Whirlpools, Raydium CLMM and Jupiter. It uses per-operation PDA vaults and address lookup tables, which collapsed a 3-transaction rebalance into 1.
• Shipped 269 tests in total: Foundry: fork tests on Base and Arbitrum, 10k-run CI fuzzing and invariants. Anchor: tests against cloned mainnet state.
• Kept every gateway under the 24 KB EIP-170 size limit, fixed a 4 KB BPF stack overflow on Solana, and added timelocked admin controls for protocol fees.

Private travel app for digital nomads and frequent travelers. Users share upcoming trips with close friends and are notified when their paths cross in the same city on the same dates. Live on the App Store and Google Play, with a freemium subscription.

• Owned the full product lifecycle alone, from product spec and UX to App Store and Google Play release (880+ commits).
• Built the iOS/Android app with Expo and React Native: a clustered map with a time slider, crossing detection, groups, push notifications and EN/FR/ES localization.
• Built the NestJS API on Neon Postgres, with scheduled jobs, a Google Places proxy and avatar storage on Cloudflare R2.
• Monetized with RevenueCat subscriptions (free tier limited by duration and distance), kept in sync through webhooks.
• Shipped 1,000+ automated tests in CI (320 mobile, about 770 API), with PostHog analytics and Sentry monitoring from day one.

Real-time multiplayer word game inspired by Codenames, played inside Telegram as a Mini App, with crypto rewards on Hedera. More than 100,000 players onboarded.

• Built the Mini App, game server and Telegram bot from scratch as the sole developer in 4 months. Shipped real-time game rooms, quests, referrals, leaderboards and farming.
• Removed crypto onboarding friction by creating a Hedera account for every player at sign-up, so non-crypto users received USDC/HBAR rewards without installing a wallet.
• Created and launched the in-game fungible token on Hedera mainnet, and automated daily reward and weekly referral payouts.
• Scaled the backend on Google App Engine and Supabase to 100k+ players. Drove retention with scheduled re-engagement messages and Mixpanel funnel tracking