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Justin SilverTECHNOLOGY, TRAVEL & EVERYTHING IN BETWEEN

A life in software.

I started building for the web in 1998. I've been building applications and connecting systems ever since.

I'm Justin Silver, known online as doublesharp. I build web applications, design technical architecture, and connect business systems. I've run DoubleSharp Consulting since 2005.

01 / Selected chapters

The story so far.

Applications, integrations, and independent projects.

Now / Current work

Rebel Dividends

My current work with Rebel Dividends includes Rip.xyz and Ensemble.io: tokenized vault strategies and the applications and infrastructure around them.

2017 onward / Blockchain applications

Web3 & blockchain applications.

Since 2021, I've focused on EVM development. My work with the Paintswap team spans its NFT marketplace, Estfor Kingdom, Paintswap VRF, and the Sonic Airdrop NFT & Order Book, alongside art NFT deployments on Fantom and Sonic.

I've also developed for Flying Tulip and provided smart contract audits and security reviews.

Earlier, in 2017–2018, I worked with Syscoin and Blockchain Foundry, the team behind the Blockmarket decentralized marketplace.

2012–2024 / Product teams

Software outside the office.

As CTO at RovAir, I worked on on-demand mobile broadband. At Secret Party, where I was CTO from August 2016 to September 2024, the focus was event management: helping hosts create event pages and manage their guests.

Since 2005 / Independent practice

DoubleSharp & enterprise systems.

I founded DoubleSharp in 2005 after working as a technical lead at Williams-Sonoma. Consulting brought work with Bell Helicopter, Riverbed, Scientific Learning, AAA, and Palo Alto Networks: business applications, cloud architecture, and integrations between systems that needed to share information.

1998–2004 / The early web

Websites, networks, and financial charts.

At Multisoft and PMG.net, development sat alongside technical support and network administration. At Prophet.net, I led development of financial charting and technical analysis websites, first in ASP and then in Java. I later returned to the business through Investools, working on tools used by more than 100,000 customers.

The full career history is on LinkedIn ↗

02 / Talks & community

Sharing the work.

I've shared technical work at developer conferences and in community conversations.

  1. 2021 / Fantom Developer Conference

    Generative NFT Development

  2. 2022 / Consensus · Fantom session

    NFT Keyed Counterfactual Smart Wallets

    Conference recap ↗

I also co-founded SolidityQuiz.com, a free place to test your Solidity knowledge, and previously hosted Fantom Unchained and Across the Chains.

03 / Open source

Code you can use.

Libraries, developer tools, and a few projects from the WordPress years.

Browse the library ↗

Applications & developer tools

Smart contract libraries & team projects

04 / Elsewhere

There's a journal, too.

This site also keeps my notes on technology, travel, and photography. Some are detailed technical write-ups; others are simply things I wanted to remember.

Explore the journal ↗Start a conversation ↗