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.
Earnings and projects
Last 6 months ÷ 6
Last 6 months: $1.7k
Billed in all: $15,981$16k
$562 in the last 6 months
Across 14 contracts
Earnings, last 30 days
Skill rankings: Top 15% in Redux
Ranked by MRR among everyone on Upwork with the skill.
- #212Project Management Professional892 freelancers · 🇳🇬 #15Top 24%🇳🇬#15 of 43
- #311Problem Solving1,247 freelancers · 🇳🇬 #9Top 25%🇳🇬#9 of 39
- #355Coaching1,319 freelancers · 🇳🇬 #5Top 27%🇳🇬#5 of 22
- #495Redux3,245 freelancers · 🇳🇬 #2Top 15%🇳🇬#2 of 42
- #848NestJS3,757 freelancers · 🇳🇬 #12Top 23%🇳🇬#12 of 62
- #913Web Scraping3,925 freelancers · 🇳🇬 #13Top 23%🇳🇬#13 of 86
- #1,117Back-End Development4,183 freelancers · 🇳🇬 #14Top 27%🇳🇬#14 of 89
- #1,445Tailwind CSS6,978 freelancers · 🇳🇬 #26Top 21%🇳🇬#26 of 158