I'm Opia Frank, a mobile-first software engineer. Flutter & Swift on the front, Rust & Java on the back, Solana & Ethereum on-chain. Several apps live on the App Store & Play Store, and a protocol dissector merged into Wireshark.
01 / About
I'm Frank Olien, a Software Engineer with over four years of experience building software products, primarily across mobile development, backend systems, and infrastructure.
02 / Skills
Flutter
Dart
Rust
Solana
Ethereum
React
TypeScript
Next.js
Tailwind
Spring
Swift
OpenAI
PostgreSQL
Firebase
Supabase
Solidity
VercelFlutterDartRustSolanaEthereumReactTypeScriptNext.jsTailwindSpringSwiftOpenAIPostgreSQLFirebaseSupabaseSolidityVercel03 / Selected Work
Products I designed and built end to end, from the interface down to the backend and the protocol work underneath. Hover any screenshot to open it.
01 · Perps · Native iOS
Trade perps on Monad with your face. A native SwiftUI app where one passkey derives the wallet and an order key sealed to Face ID, so there is no seed phrase and the key that moves money is never stored. Copy the traders who are actually winning, read straight off Perpl's exchange contract, with alerts, widgets and a Live Activity.
02 · Payments · Dollars on Arc
Money that moves like a message. A native iOS app for USDC on Arc, Circle's chain for dollars. Send to a person by @handle, request money, write cheques they cash later, earn on idle USDC, convert to EURC. Every account is a Safe with a Secure Enclave key and an iCloud key, so there is no seed phrase, and fees are paid in the dollars you already hold.
03 · Open Source · C
A native dissector for UDX, the UDP transport behind Holepunch's peer-to-peer stack, merged into Wireshark. It decodes the header, SACK blocks and payload, pairs both directions of a conversation, runs TCP-style sequence analysis, flags retransmissions and loss, and reassembles streams for Follow UDX Stream. Three merge requests, refined through maintainer and libudx review.
More work
ferry.money · MonadSend dollars across borders. Settled in a second.
Payments · Cross-border
Send dollars from your phone and receive them in a wallet or a local bank. AUSD on Monad, one passkey as the account, gasless sends through a relayer, and cash-outs that settle atomically through Agora's Instant Settlement pool. Ferry Flows splits incoming money across up to five onchain destinations from one rule; Ferry Drop is a non-custodial escrow live on mainnet.
Fintech · Wallets
A dollar account for everyday life. Hold dollars on your phone, send them to anyone by username in seconds for cents, and top up from local currency. Sign in with a passkey, no seed phrase, with recovery built into the product rather than bolted on.
Prediction · Onchain
Live football predictions with a self-custodial USD₮ wallet. Call live ties, run knockout cups, and manage a fantasy XI. Buy-ins go to escrow, payouts settle on-chain.
Aid · Zero-Knowledge
Confidential aid disbursement on Stellar. Beneficiaries prove they qualify and claim USDC without exposing their identity. Groth16 zero-knowledge proofs, verified on-chain.
Payroll · Privacy
Confidential payouts on Canton. Pay every contributor in one batch where each sees only their own line. Privacy enforced by the ledger, not the app.
Wallet · Flutter
A Solana wallet to deposit, swap, stake, and send SOL and SPL tokens, with live balances over Solana RPC, biometric unlock and a full onboarding flow.
Exchange · Flutter
A crypto exchange app with a live market watchlist, spot prices, and a trading UI modeled after Binance.
Marketplace · Rust + Flutter
A peer-to-peer car rental marketplace for Lagos. Rust and Actix-Web API for listings, bookings and payments, a React web client, and a Flutter app.
APIs & systems
TypeScript · Swift
Local-first AI SDK for private, peer-to-peer AI apps. LLMs, speech-to-text and translation fully on-device across Linux, macOS, Windows, Android and iOS.
SourceRust · Solana
A crankless on-chain order book on Solana. Post, cancel and fill in one transaction, with no crank, no oracle and no custody. Deterministic matching engine, 285 tests including fuzzing.
SourceRust · Actix-Web
The backend for Qent, a peer-to-peer car rental marketplace. Services for listings, bookings and payments.
SourceRust · REST
A billing and invoicing backend. Create invoices, track their status and settle payments through a typed REST API.
SourceJava · Spring Boot · Solidity
A Web3 wallet backend. Custodial wallet services, on-chain transfers and balance tracking wired to Solidity contracts.
SourceJava · Spring Boot
A healthcare REST API. Hospital search, pharmacy locator, doctor finder and diagnostic-centre lookup with global coverage.
SourceLive on the stores
04 / Contact
I'm open to freelance, full-time roles, and interesting collaborations, especially in mobile, Web3, and AI.
Frankolien123@gmail.com
