About ExtBit LLC

Extend the bit, protect your data.

ExtBit LLC is a US-based software engineering studio and technical consulting practice specialized in low-level systems architecture, custom backend infrastructure, developer tooling, and data privacy software.

Founded and led by principal software architect Duzy Chan, ExtBit provides B2B clients, technology startups, and Web3 teams with production-grade engineering solutions built for high performance, reliability, and security.

Our Mission

Modern software infrastructure requires both absolute technical precision and uncompromising data security. Our motto—"Extend the bit, protect your data"—guides every project we undertake:

  • Extend the bit: Building high-throughput systems, custom utilities, developer extensions, and performant core tools that expand what software can achieve.
  • Protect your data: Engineering zero-trust architectures, privacy-first software, secure backend nodes, and robust cryptography infrastructure that keep user and corporate data safe.

Core Engineering Capabilities

We deliver deep technical expertise across four primary domains:

  1. Systems Architecture & Low-Level Engineering: High-performance C/C++, Golang microservices, embedded Linux kernel/driver modules, custom socket/network protocols, and kernel-level performance optimization.
  2. Developer Tooling & Extensions: Custom SDKs, developer frameworks, CLI utilities, system extensions, and developer-facing infrastructure software.
  3. Web3, Cryptography & Open-Source Protocols: Protocol development, smart contract security reviews, and decentralized node maintenance. We actively research, fork, and maintain open-source blockchain networks (such as Bitcoin Core alternatives) strictly as open-source software R&D initiatives.
  4. Mobile & Embedded Platforms: Native Android framework development, C++/JNI library porting, and real-time audio/video streaming pipelines (GStreamer).

Proven Track Record

MetricDetail
Industry Experience15+ years of systems architecture & software design
B2B Engagements30+ successful client contracts delivered globally
Track Record & Output2,000+ verified billable hours & 30+ completed milestone projects
Delivery ChannelsEnterprise contracting via Upwork (Individual & Agency), Freelancer, and direct B2B

Our Operating Commitment

ExtBit LLC operates strictly as a pure software engineering studio and open-source maintainer. We prioritize clarity, code quality, and legal transparency in every partnership:

  • Pure Technical Scope: We build, maintain, and audit open-source software and corporate codebases. We do not operate as an exchange, broker, or custodian. We do not issue financial securities, facilitate token sales, or hold user funds.
  • 100% Custom Intellectual Property Transfer: All custom software, unique business logic, and code specifically written for client engagements transfer fully to the client upon cleared payment and agreed terms.
  • Background IP & Pre-Existing Tools: ExtBit LLC retains sole ownership of its pre-existing tools, developer frameworks, technical know-how, and open-source libraries. Clients are granted a perpetual, non-exclusive, royalty-free license to use and modify these underlying components within their project.
  • Strict Confidentiality & NDA: We maintain full privacy and security standards regarding client proprietary repositories, API infrastructure, and trade secrets.
  • Code Quality Guarantee: Every deliverable comes with comprehensive documentation, clean commit histories, and dedicated post-delivery support to ensure seamless integration.

Get in Touch

Whether you need a senior technical partner to architect a complex system, optimize high-throughput infrastructure, or port desktop and web logic to mobile terminals, ExtBit LLC is ready to collaborate.