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Kosisochukwu A.
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Kosisochukwu A.

Senior Javascript Developer | Full-Stack AI Integrations & Bug Fixing

I help businesses build, fix, and scale modern web applications with zero downtime. Whether you need a Next.js app built cleanly from scratch, complex API integrations, or critical bugs fixed in production, I step in to move your project forward. With 7+ years of engineering experience, I leverage modern web ecosystem tools and AI-assisted workflows to ship high-quality updates faster than traditional developer setups. Most clients hire me for one of three reasons: - They need a new web app or MVP built properly from the ground up. - An existing application is broken, slow, or has an uncompleted feature backlog. - They need a reliable, independent developer who can sync with an existing team and ship clean work immediately. My Core Technical Stack: - Frontend: React, Next.js (App Router), TypeScript, Tailwind CSS - Backend & DB: Node.js, NestJS, PostgreSQL - Cloud & DevOps: AWS, Vercel, API & Payment Gateway Integrations What I bring to your project: I care deeply about clear communication, technical reliability, and solving the actual business problem, not just writing lines of code. If a requirement is unclear, I ask targeted questions before building. If I spot a more efficient architecture or a security gap, I present a clear solution. If you need a developer who takes absolute ownership, communicates transparently, and helps unblock your product, let's chat about your project.

🇳🇬Lekki, Nigeria$15/hr100% JSS4.95 (10)Since Mar 2021
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Earnings and projects

MRR
$281

Last 6 months ÷ 6

World#100,914 / 412k
🇳🇬Country#3,328 / 13.8k
Revenue, last 30 days
$0

Last 6 months: $1.7k

Total earnings
$15k

Billed in all: $16k

World#162,984 / 412k
🇳🇬Country#2,835 / 13.8k
Per project
$1.2k

$562 in the last 6 months

World#113,092 / 412k
🇳🇬Country#2,049 / 13.8k
Projects, last 6 months
3
33% fixed67% hourly
World#66,479 / 412k
🇳🇬Country#4,051 / 13.8k
Projects in all
13

Across 14 contracts

21% fixed79% hourly
World#175,712 / 412k
🇳🇬Country#6,123 / 13.8k

Earnings, last 30 days

$16kNothing earned in the last 30 daysBilled in all, before Upwork's fee · drag across the chart to see what was earned in any stretch
$15.6k$15.8k$16.0k$16.2kOct 8Oct 23Nov 7

Skill rankings: Top 15% in Redux

Ranked by MRR among everyone on Upwork with the skill.

  1. #212Project Management Professional892 freelancers · 🇳🇬 #15Top 24%
  2. #311Problem Solving1,247 freelancers · 🇳🇬 #9Top 25%
  3. #355Coaching1,319 freelancers · 🇳🇬 #5Top 27%
  4. #495Redux3,245 freelancers · 🇳🇬 #2Top 15%
  5. #848NestJS3,757 freelancers · 🇳🇬 #12Top 23%
  6. #913Web Scraping3,925 freelancers · 🇳🇬 #13Top 23%
  7. #1,117Back-End Development4,183 freelancers · 🇳🇬 #14Top 27%
  8. #1,445Tailwind CSS6,978 freelancers · 🇳🇬 #26Top 21%