ELExtBit LLC
High-performance systems engineering studio specializing in low-level C/C++, Golang microservices, custom Linux architecture, Web3 protocol infrastructure, and mobile code porting.
Total earned
$79.2K
lifetime, as published
Jobs
8
contracts to date
Hours
522
billed hourly
Job Success
—
not yet rated
Hourly rate
$170–$175/hr
min. project $1,000+
Index Score
45
#10489 overall
Insights
How these are computed- Run-rate, measured
- pending
- Needs two observations at least 14 days apart. Our next read of this page turns this on. Nothing is extrapolated from a single contract.
- Lifetime pace
- $7.8K/yr estimate
- Lifetime earnings divided by years on Upwork. A floor on historical pace, not a forecast.
- Earnings per job
- $9.9K
- Average contract value to date.
- Recent earnings, per Upwork
- $0
- The "recent" figure Upwork attaches to the directory card. Upwork does not publish the window, so it is shown as its number, not ours.
- Realised hourly
- $152/hr
- Total earned over billed hours. Fixed-price work inflates it; compare with the rate card.
Index Score breakdown44.5/100
Scale 28/40Quality 10/20Trust 0/15Momentum 3/15Team 3.5/10
Observation history
Every read of the public page. Last observed Oct 29, 2026 (live read).
| Observed | Earned | Δ | Jobs | JSS |
|---|---|---|---|---|
| Oct 29, 2026 | $79.2K | 8 | — |
One observation so far. The index re-reads every page on a rolling schedule; claimed pages are read weekly.
About
ExtBit LLC is a US-based software engineering studio & consulting practice specializing in high-performance backend infrastructure, low-level systems architecture, custom developer tooling, and Web3 protocol engineering. Guided by our mission—"Extend the bit, protect your data"—we partner with startups, enterprises, and protocol builders to engineer fast, secure software. Led by principal architect Duzy Chan (15+ years experience), ExtBit brings proven expertise across 30+ B2B engagements and 2,000+ verified billable hours. Core Engineering Capabilities High-Performance Backend & Systems: Low-latency C/C++ & Golang microservices, custom socket protocols (TCP/UDP, gRPC, REST), multithreading, Linux kernel concepts, and async I/O. Mobile & Cross-Platform Porting: Porting complex desktop/web C/C++ applications to native mobile (Android NDK/JNI, iOS) with zero performance loss. Web3 & Cryptography Infrastructure: Core protocol development, node maintenance (Ethereum/Bitcoin), cryptographic primitives, smart contract audits, and API integrations. Developer Tooling & Data Protection: Custom SDKs, CLI utilities, system extensions, and zero-trust software designed to protect enterprise data. Primary Technical Stack Languages: C, C++ (C++11 through C++20), Golang, Solidity, Python, Shell/Bash, SQL, JavaScript/TypeScript. Systems & Compilers: Embedded Linux, Custom JIT Virtual Machines, Bytecode/AST Parsers, POSIX Threads, Sockets, IPC, Systemd, GDB, Valgrind, Memory Optimization. Web3 & Security: EVM, Smart Contract Auditing, AST Code Reviews, Invariant Verification, Penetration Testing, Cryptographic Primitives, Bitcoin / Ethereum Nodes. Networking & Backends: Microservices, gRPC / Protobuf, Nginx, High-throughput Sockets, Custom Controllers. Mobile & Media Processing: Android NDK / JNI, iOS Native C++ wrappers, GStreamer audio/video pipelines. DevOps & Infrastructure: Git, Docker, CI/CD Build Pipelines, Linux Server Management, Automated Testing. How We Work with Clients Architecture & Optimization: Auditing codebases to eliminate performance bottlenecks, fix memory leaks, and lower backend latency. Reference Implementation Porting: Porting web, CLI, or desktop software into production-ready mobile libraries and native UI integrations. Dedicated Engineering Retainers: Providing senior C++/Golang technical capacity to extend your in-house team on a weekly retainer basis. Enterprise Quality Standards 100% IP Transfer: Full ownership of custom source code, docs, and assets transfers directly to your company upon payment. Strict NDA Compliance: Zero-trust security practices safeguard your proprietary codebases and trade secrets. Clean Code & Testing: Built to enterprise standards with robust documentation, clean commit histories, and CI/CD readiness. Ready to build or scale your technical infrastructure? Send an invitation to ExtBit LLC or contact us directly to discuss your project requirements.Read more
Skills
GolangJavaC++CBitcoinBlockchainLinux System AdministrationSolidityPenetration TestingJavaScript
Agency facts
- Team size
- 2-10
- Teams on Upwork
- 1
- Founded
- —
- Member since
- Aug 2016
- Last contract
- May 2019
- Owner
- Duzy C.
- Client focus
- Large business, Medium business, Very small business, Small business
- Members in
- China
- Languages
- —
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ExtBit LLC is #4559 of 25,139 Upwork agencies, top 25%. Post the card, or share the link and the card comes with it.
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