I ship production systems end-to-end: AI-native workflow tools, secure smart contracts and full-stack products for high-trust systems where security, auditability and delivering under pressure actually matter.

Available worldwide · Remote© 2026 Filip Smith
About/ 01

I build high-trust systems end-to-end.

I'm a full-stack developer who ships production systems from contract to frontend: AI-native workflow tools, institutional B2B platforms, secure smart contracts, backend systems and live interfaces.

Most of my work lives on the Claude and OpenAI APIs: agentic workflows, LLM-powered tooling and human-in-the-loop review flows, with a strong bias toward security-conscious automation.

My background spans TypeScript, Web3, EVM chains, Bitcoin L2 and Solana: high-trust environments where auditability, security and reliability are the whole point.

Proven ability to deliver under extreme constraints.

  • 1stMIDL VibeHack BTC 2026Tekton, trustless OTC desk
  • 3rdSui Liquid Staking HackathonVolo, share of 25M SUI delegation
  • <24hSolana SpacesCheckout audited + rebuilt pre-launch
  • BaseBotcoinPool live on mainnetO(1) reward distribution
  • 9+ChainsMulti-chain stablecoin payments
  • 35+AI providersIntegrated for autonomous agents

Selected work

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Ongoing
01AI Engineering · B2B / FDE

21& Labs

AI-native assurance workflows

Internal AI tooling, security-hardening pipelines and stress-testing infrastructure for a Dubai-based technology consultancy. Agentic workflows for regulated assurance: document intake, evidence review, workpaper drafting and human signoff, with tamper-aware audit trails, role-based controls and a clear line between AI assistance and human approval.

Ongoing engagement
02Smart contracts · Web3

Tekton

Trustless OTC trading on Bitcoin L2

A peer-to-peer OTC trading protocol that replaces custodial intermediaries with smart-contract escrow on Bitcoin L2 (MIDL). TektonEscrow.sol handles atomic swaps, two-phase cancellation, expiry reclamation and on-chain reputation, backed by end-to-end encrypted P2P messaging (ECDH + AES-256-GCM) and wallet-signature auth with CSRF, rate limiting and CSP.

1st place · MIDL VibeHack BTC 2026GitHub (opens in new tab)
03Smart contracts · Full-stack

BotcoinPool

Autonomous DeFi mining pool

A full-stack decentralized mining pool live on Base mainnet. Users pool BOTCOIN for Proof-of-Inference mining and earn proportional epoch rewards. BotcoinPoolV3 and its factory ship a single-use lifecycle, O(1) reward distribution and a dual fee model, paired with a live pool dashboard, an operator setup wizard and a Node.js mining bot driven by Claude and GPT-4.

Live on Base mainnetGitHub (opens in new tab)
Shipped <24h
04Security · Payments

Solana Spaces

Checkout pipeline audit & rebuild

An emergency engagement 24 hours before mainnet launch to audit and rebuild the entire purchase-to-checkout flow. I resolved critical failures across QR payment creation, order processing and on-chain verification, and shipped a working dual-rail checkout (Solana Pay + Stripe) from audit to production in under a day. Retained for ongoing security hardening.

Audit to production in under 24h
Pre-launch
05Payment infrastructure

Stablecoin Payment Processor

Autonomous payments for AI agents

Payment infrastructure that lets AI agents autonomously pay for services in stablecoins across 9+ networks. A REST API drives payment creation, streaming payments and milestone escrow; OAuth + API-key auth covers 35+ AI providers; auto-routing picks the cheapest, fastest chain per transaction; and per-agent budget controls enforce real-time spend across USDC, USDT, DAI and PYUSD.

Pre-launch · in funding
3rd place
06DeFi · Web3

Volo

Liquid staking on Sui

A liquid staking protocol built for the Sui Liquid Staking Hackathon, placing 3rd and earning a share of a 25M SUI delegation from the Sui Foundation.

3rd place · Sui Liquid Staking Hackathon

Capabilities

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01

AI Engineering

  • Agentic workflows
  • LLM tooling
  • Tool / function calling
  • Structured outputs
  • Human-in-the-loop review
  • Claude API
  • OpenAI API
02

B2B / FDE Systems

  • Institutional workflow design
  • Requirements discovery
  • Audit trails
  • Evidence provenance
  • Role-based controls
  • Secure handoff flows
  • Operational dashboards
03

Languages

  • TypeScript
  • Solidity
  • Rust
  • Node.js
04

Full Stack

  • Next.js
  • React
  • Tailwind CSS
  • Prisma
  • PostgreSQL
  • Supabase
  • Turso
  • SQLite
  • REST APIs
05

Security

  • Smart-contract auditing
  • Authorization probes
  • Input validation
  • Rate limiting
  • CSP
  • CSRF protection
  • ECDH
  • AES-256-GCM
06

Web3

  • wagmi
  • viem
  • ethers.js
  • Solana Pay
  • Metaplex
  • RainbowKit
  • WalletConnect
  • MIDL SDK
  • Anchor
  • Hardhat
  • OpenZeppelin
07

Blockchain

  • Ethereum
  • Solana
  • Bitcoin
  • Base
  • MIDL Protocol
  • Arbitrum
  • Polygon
  • Sui Network
08

DevOps

  • Vercel
  • Git

Experience

/ 04
  • 01

    QA / QC Engineer

    Dex Finance
    Internship · Remote · Jan 2022 – Jul 2023
    • QA testing on DeFi smart contracts and frontend interfaces across the protocol's product suite.
    • Identified bugs, edge cases and UX issues; contributed to test coverage and regression workflows across contract and frontend releases.
  • 02

    Corporate QA

    bol
    Netherlands · 2021 – 2022