Creator of the OCEAN Bitcoin mining pool

- Many various bug fixes and minor feature improvements- Many significant improvements to compatibility of source code compiling system- Ongoing review of other contributors' changes- Ongoing stable branch backports/maintenance- Diagnosis and addressing of various security issues, some critical to the Bitcoin network- Multi-wallet support, enabling users to load more than a single wallet concurrently- Stable branch release maintainer from 2011 through 2014- Optimisations to block relay, reducing propagation latency, and thereby improving network-wide miner security- Completed work on "coin control" features, giving expert users more control over low-level Bitcoin wallet primitives- Refactored transaction selection policy for miners to enable child-pays-for-parent (CPFP)- Implemented node-side "getblocktemplate" decentralized mining protocol standard (BIPs 22 & 23)- Collaborated on making deterministic binary distributions possible with gitian- Maintained testing branches with new features not yet merged, to broaden user contribution to review- Expanded BTC precision from 2 decimal points to 8

- First node software to deliver many new features and fixes- GUI support for loading and using multiple wallets concurrently (multi-wallet)- Quite a few performance and "don't disturb the user doing other things" improvements- Complete user control over a large variety of spam control policies (including always-on filters in Bitcoin Core)- Support for alternative transaction selection policies, including strict bytes-per-sigop limits, coin-age priority, etc- Real-time GUI Bitcoin network watching tool- Node-updatable configuration file to enable shared configs between GUI and daemon, with many more user-accessible options- Advanced debugging capabilities in libbitcoinconsensus, enabling script tracing and single stepping

- Longest-contributing Bitcoin Core developer, since the start of 2011- Lead maintainer of the enhanced Bitcoin Knots derivative- Diagnosis and addressing of various security issues, some critical to the Bitcoin network (including many CVEs)- Assist in community outreach/education by regular interaction on Twitter and reddit, as well as occasional conferences and meetups- Current editor/maintainer of the Bitcoin Improvement Proposals standards process and repository- Maintainer of BFGMiner (formerly cgminer) Bitcoin mining software- Ongoing research into protocol changes (hardforks, softforks, extension blocks, forward blocks, etc)- Ongoing research into safe block sizes/weights, network security models, etc- Maintain real-time Bitcoin network statistical information, monitoring network security, software being used, etc- Maintain Gentoo packages for various software projects, including Bitcoin Core and Knots- Helped design Segwit as a softfork (BIP 141), and updated getblocktemplate for Segwit (BIPs 9 & 145)- Assisted in careful deployment of the BIP 148 Segwit and later Taproot UASFs, avoiding a possible catastrophic chain split- Wrote KYCPoll, polling software to use Bitcoin exchange KYC for human verification, to aide in measuring community support for proposals- Research into the concept of sidechains and co-authored the original sidechains whitepaper- Primary author of "getblocktemplate" decentralized mining protocol standard (BIP 22/23, predating Stratum v1 & v2) as well as reference implementations in C and Python- Founder and former operator of Eligius mining pool- Provided an alternative implementation of P2SH (OP_CHECKHASHVERIFY, BIP 17)- Designed a number of mining pool reward systems to ensure fair division of mining rewards

- Lead maintainer since 2012; contributor since 2011- Working closely with ASIC manufacturers for ongoing and future mining devices- Implemented driver independence framework and initial FPGA/ASIC support- Wrote drivers for many mining devices (full list on http://bfgminer.com)- Abstracted mining algorithm, enabling flexibility with other algorithms (so far, scrypt and Keccak aka SHA-3)- Full getblocktemplate support, implemented as a reusable code library (libblkmaker)

Wrote and maintained several package building scripts (ebuilds).Designed and led development of the InGen user-friendly installer project.

Responsible for complete project design and most development, including: - Basic Python framework for home automation- AJAX web interface for monitoring and control- Proliphix IP-HVAC interoperability module- CM11A module providing support for X10/BSR units and inputs- Modbus interfaces with solar inverters and whole-house battery backup- FreeAbode smart thermostat firmware (including support for Nest Learning Thermostats and HestiaPi)- Interfacing with Tasmota smart devices / IoT

Collaborated on designing and implementing first ever Bitcoin-compatible sidechain (Elements Project & Liquid), including confidential transactions integration.Various other internal software development.

Designed and implemented the network architecture for a new office.Conduct periodic network maintenance including a Cisco router, clustered IM server, Asterisk PBX, netfilter/iptables firewall and a variety of Linux-based servers.Designed and developed a real-time log watching utility to monitor Genesys T-Lib events.Assisted in the design, development, and testing of several in-house VXML compliance test harness projects, and OpenVXML quality assurance.Developed a reporting tool, including reports, for real-time and batch call path analysis of Voice Genie and Genesys Voice Platform applications built on the OpenVXML development platform.

Established and brought one of the earliest Bitcoin mining pools to grow to make up a large percentage of the Bitcoin network. Wrote and developed the first large-scale open source mining pool software, including support for the getblocktemplate (GBT) decentralised mining protocol. Designed a number of mining pool reward systems to ensure fair division of mining rewards.

Maintained this fork of the LambdaMOO compiler/interpreter integrating several clean, but less tested features such as: - a variety of C operators- numeric literals in binary, octal, and hexadecimal radixes- Unicode support- ability to include non-printable characters in string literals using backslash escaping- ported various C-implemented functions into the MOO language and vice versa- internal MOO sockets- compiler warnings in addition to errors

Lead development toward the goal of a new operating system combining and building upon the pros of both source-based and binary-based operating systems while at the same time being friendly toward the average computer user.

Ported and unified highlevel U3 and UE9 APIs from C to Python

Designed and implemented management system for user-extensible game resources.Led development of support for arbitrarily shaped game arenas and player axes.Participated in research and evaluation of a variety of source code management and issue tracker tools.Migrated to a single Subversion repository preserving the complete history and structure of the project spanning multiple forked CVS repositories.Modularized in-development function classes to ease refactoring to a more flexible game paradigm.Administrate and maintain centralized game resource repository and archive of past and present game releases.Assisted in preparing and deploying new stable game release.Designed XMPP-based concept for offloading authentication, network browsing, and chat to regular XMPP network services.Established a small company providing hosting services for game servers.

Developed capabilities for the bot to communicate in multiple simultaneous conversations over the internet using XMPP instant messaging.

Designed and developed this modular file sharing application, including modules for a few popular protocols including IRC / DCC, NeoModus's Direct Connect, and OpenNapster

Completely rewrote an enjoyable puzzle game creation system from scratch.Enhanced the game engine by adding new elements such as teleporters.