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Kevin B.
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Kevin B.

Full-Stack Engineer- AI Products - Fintech & Blockchain Infrastructure

I build production-grade software at the intersection of AI, fintech, and blockchain. My work spans the full stack — from backend architecture and API design to polished React frontends — with a focus on systems that handle real money, real data, and real users. Past and current work includes an AI-powered personal health platform with food analysis and a token reward economy; and a custodial crypto trading platform integrating Cobo WaaS 2.0 for a funded fintech startup. What I deliver for clients: AI-integrated applications — Gemini, OpenAI, and Claude APIs wired into production products Crypto exchange infrastructure — Trading platform with rest API & websocket order execution, Cobo WaaS 2.0 MPC custody, KYC integration, VARA licensing support Algorithmic trading systems — MQL4/MQL5 EAs, Python ML pipelines, live deployment on IC Markets and similar brokers Full-stack web and desktop applications — React/Vite frontends, Node.js/Express backends, Supabase (PostgreSQL), deployed on Vercel, Railway, and AWS Smart contracts and dApps — Solidity, Rust, Web3.js, ethers.js across EVM chains and Solana I work independently, communicate clearly, and ship. 100% Job Success · Top Rated Plus. Stack: TypeScript · Node.js · React · Python · MQL5 · Solidity · Supabase · AWS · Cobo & Fireblocks WaaS · Vite · Vercel · Railway

🇯🇵Kawagoe, Japan$70/hr100% JSS4.98 (45)Since May 2021

Earnings and projects

MRR
$560

Last 6 months ÷ 6

World#73,263 / 412k
🇯🇵Country#162 / 1,269
Revenue, last 30 days
$500

Last 6 months: $3.4k

World#62,841 / 412k
🇯🇵Country#150 / 1,269
Total earnings
$97k

Billed in all: $97k

World#40,557 / 412k
🇯🇵Country#66 / 1,269
Per project
$688

$1.1k in the last 6 months

World#154,386 / 412k
🇯🇵Country#376 / 1,269
Projects, last 6 months
3
100% fixed0% hourly
World#66,479 / 412k
🇯🇵Country#199 / 1,269
Projects in all
141

Across 151 contracts

96% fixed4% hourly
World#17,269 / 412k
🇯🇵Country#36 / 1,269

Earnings, last 30 days

$97.2k+$500 earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$96,500$96,750$97,000$97,250Oct 8Oct 23Nov 7

Skill rankings: Top 9% in Bitcoin

Ranked by MRR among everyone on Upwork with the skill.

  1. #23Bitcoin267 freelancers · 🇯🇵 #1Top 9%
  2. #28MQL 4241 freelancers · 🇯🇵 #1Top 12%
  3. #35MQL 5240 freelancers · 🇯🇵 #1Top 15%
  4. #51Financial Trading259 freelancers · 🇯🇵 #1Top 20%
  5. #91Trading Automation467 freelancers · 🇯🇵 #2Top 19%
  6. #102Websockets613 freelancers · 🇯🇵 #1Top 17%
  7. #124Bot Development927 freelancers · 🇯🇵 #2Top 13%
  8. #192Blockchain1,753 freelancers · 🇯🇵 #4Top 11%