CALEB DITCHFIELD · SENIOR BACKEND & BLOCKCHAIN ENGINEER

I build financial infrastructure where transaction correctness, security, and reliability matter.

I have spent 9+ years building backend, distributed, and security-critical systems, primarily in TypeScript, Node.js, and Solidity. My work spans stablecoin lifecycle engineering, tokenization, EVM transaction orchestration, wallet and signing flows, permissions, monitoring, and incident response.

Current work: production EVM transaction infrastructure, coding-agent evaluation, and independent backend systems.

Receipts (GitHub stats) | Receipts (Blockchain stats)

9+ years
professional software engineering
83 merged PRs
public production contributions at Fei
$3.5B peak PCV
security-critical systems operated at Fei
410k+ transactions
live multi-chain Tarkin activity

Selected work

01 / Fei Protocol / Fei Labs / 2021–2022

Stablecoins · Permissions · Security · Operations

Stablecoin lifecycle engineering with production controls at $3.5B peak PCV.

As Fei's initial Solidity engineer, I shipped and reviewed 20+ production contracts and TypeScript tooling across FEI, TRIBE governance, redemption, and protocol-controlled-value systems. My 83 merged public PRs include role-based permissions, guardian/admin controls, governance validation, deployment automation, monitoring, and incident-response infrastructure.

02 / Tarkin / Independent / Retired

Node.js · Transaction Orchestration · Wallets · EVM Infrastructure

A high-throughput transaction pipeline operated across 410,000+ live transactions.

Tarkin consumed live mempool traffic, generated candidate transactions, and distributed deterministic simulations across local EVM nodes and up to eight workers. I built its wallet/provider layer, signing and transaction controls, ERC-20 approval flows, guarded Solidity execution, Dockerized node infrastructure, and Datadog/Discord observability.

Proof: ~5,000 transaction variants/second · 400k+ BNB Smart Chain transactions · 10k+ Polygon transactions

03 / Votre / Collar Networks / 2023–2024

DeFi Lending · Protocol Architecture · Solidity

Founding engineering for a novel onchain lending mechanism.

Owned the architecture, contracts, TypeScript integrations, correctness controls, and tests as the sole engineer through a16z CSX Spring 2024.

04 / Arboreum / 2019–2020

RWA Tokenization · Verification · Marketplace

Carbon-credit tokenization and verification on Ethereum.

Led development of an Ethereum-based carbon-credit tokenization, verification, and marketplace platform, shaping the token, exchange, and verification-flow architecture.

05 / Hypernet Labs / 2020–2021

Payment Channels · Onchain/Offchain Settlement · Node.js

Connecting application state to Ethereum settlement.

Architected Layer 2 payment-channel systems for metered and subscription compute, then built the Solidity contracts and TypeScript/Node.js middleware connecting off-chain state with Ethereum finality through Connext.

06 / Meta Archive Explorer / Independent / 2026

FastAPI · SQLite · Alembic · LanceDB

Database and API infrastructure for a 40+ GiB private archive.

A local-first FastAPI service, SQLite/Alembic data model, and LanceDB retrieval layer ingest and reconcile 1.3M+ messages while retaining source provenance. Loopback-only access, one-time tokens, HttpOnly sessions, guarded attachments, and reversible deletion controls keep private data private.

07 / Applied AI and other open-source work / Current

Coding-Agent Evaluation · Retrieval · Developer Tooling

Applied AI as an expansion of production systems work.

I design and review adversarial coding-agent evaluations, graders, tests, and reference implementations. Spearbot explored hierarchical code summaries and HNSW retrieval for repeatable Solidity audit analysis; Codex Repo Template packages versioned repository context and agent workflows.

Open source

Experience

2026–now

DataAnnotation + other platformsLLM evaluation engineer

2023–now

Segfault SecurityIndependent software engineer

2023–2024

Votre / Collar NetworksFounding engineer

2021–2022

Fei LabsFounding engineer, Solidity & security

2020–2021

Hypernet LabsLead Solidity engineer

2017–2020

EarlierArboreum, Rising Line / Zethr, Nead Werx

Contact

Contact: GitHub, LinkedIn, Email, Phone, Resume (PDF)